add 18th iteration of classifier

1 files changed, 326 insertions, 0 deletions

diff --git a/results/classifier/118/none/1673130 b/results/classifier/118/none/1673130
new file mode 100644
index 000000000..d3d47d853
--- /dev/null
+++ b/results/classifier/118/none/1673130
@@ -0,0 +1,326 @@
+graphic: 0.721
+risc-v: 0.690
+performance: 0.684
+register: 0.678
+device: 0.646
+virtual: 0.645
+mistranslation: 0.632
+files: 0.627
+user-level: 0.618
+peripherals: 0.613
+assembly: 0.603
+debug: 0.601
+permissions: 0.597
+ppc: 0.592
+TCG: 0.592
+KVM: 0.590
+arm: 0.590
+VMM: 0.583
+PID: 0.580
+x86: 0.579
+vnc: 0.575
+network: 0.573
+hypervisor: 0.570
+socket: 0.563
+semantic: 0.558
+architecture: 0.550
+kernel: 0.513
+boot: 0.464
+i386: 0.345
+
+qemu 2.7.0 receives SIGABRT in qemu_coroutine_enter()
+
+I've been experiencing frequent SIGABRTs (in addition to segfaults in #1671876) lately with qemu 2.7.0 running Ubuntu 16.04 guests. The crash usually happens in qemu_coroutine_enter(). I haven't seen this so far with any other guests or distros.
+
+Here is one stack trace I obtained
+--------------------------------------------------------------------------
+(gdb) bt
+#0  0x00007fd7cc676067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
+#1  0x00007fd7cc677448 in __GI_abort () at abort.c:89
+#2  0x0000556aed247b6c in qemu_coroutine_enter (co=0x7fd574300df0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:113
+#3  0x0000556aed247e55 in qemu_co_queue_run_restart (co=0x7fd574300ce0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#4  0x0000556aed2479a9 in qemu_coroutine_enter (co=0x7fd574300ce0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#5  0x0000556aed247e74 in qemu_co_queue_run_restart (co=0x7fd589111670) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#6  0x0000556aed2479a9 in qemu_coroutine_enter (co=0x7fd589111670) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#7  0x0000556aed247e74 in qemu_co_queue_run_restart (co=0x7fd57430dba0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#8  0x0000556aed2479a9 in qemu_coroutine_enter (co=0x7fd57430dba0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#9  0x0000556aed247e74 in qemu_co_queue_run_restart (co=0x7fd589119130) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#10 0x0000556aed2479a9 in qemu_coroutine_enter (co=0x7fd589119130) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#11 0x0000556aed247e74 in qemu_co_queue_run_restart (co=0x7fd589117410) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#12 0x0000556aed2479a9 in qemu_coroutine_enter (co=0x7fd589117410) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#13 0x0000556aed247e74 in qemu_co_queue_run_restart (co=0x7fd577f00e00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#14 0x0000556aed2479a9 in qemu_coroutine_enter (co=0x7fd577f00e00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#15 0x0000556aed247fa0 in qemu_co_enter_next (queue=queue@entry=0x556aef34e5e0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:106
+#16 0x0000556aed1e6060 in timer_cb (blk=0x556aef34e590, is_write=<optimized out>) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/block/throttle-groups.c:400
+#17 0x0000556aed1a3615 in timerlist_run_timers (timer_list=0x556aef3bad40) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/qemu-timer.c:528
+#18 0x0000556aed1a3679 in timerlistgroup_run_timers (tlg=tlg@entry=0x556af0738758) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/qemu-timer.c:564
+#19 0x0000556aed1a3f47 in aio_dispatch (ctx=ctx@entry=0x556af0738610) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/aio-posix.c:357
+#20 0x0000556aed1a40e8 in aio_poll (ctx=0x556af0738610, blocking=<optimized out>) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/aio-posix.c:479
+#21 0x0000556aed005c79 in iothread_run (opaque=0x556af07383c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/iothread.c:46
+#22 0x00007fd7cc9f40a4 in start_thread (arg=0x7fd7aafff700) at pthread_create.c:403
+#23 0x00007fd7cc72962d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
+--------------------------------------------------------------------------
+
+The code crashes here
+--------------------------------------------------------------------------
+void qemu_coroutine_enter(Coroutine *co)
+{
+    Coroutine *self = qemu_coroutine_self();
+    CoroutineAction ret;
+
+    trace_qemu_coroutine_enter(self, co, co->entry_arg);
+
+    if (co->caller) {
+        fprintf(stderr, "Co-routine re-entered recursively\n");            
+        abort();  <--- Code aborts here                                               
+    }
+
+    [...]
+}
+--------------------------------------------------------------------------
+
+Debugging further we see:
+--------------------------------------------------------------------------
+(gdb) frame 2
+#2  0x0000556aed247b6c in qemu_coroutine_enter (co=0x7fd574300df0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:113
+113    /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c: No such file or directory.
+(gdb) print *co
+$1 = {entry = 0x7fd793e95a58, entry_arg = 0x1, caller = 0x7fd793e95a38, pool_next = {sle_next = 0x10}, co_queue_wakeup = {sqh_first = 0x7fd6ebbd2000, sqh_last = 0x1000}, co_queue_next = {
+    sqe_next = 0x7fd6ebbd1000}}
+(gdb) print *co->caller
+$2 = {entry = 0x400400000001, entry_arg = 0xc546a20, caller = 0x0, pool_next = {sle_next = 0x0}, co_queue_wakeup = {sqh_first = 0x0, sqh_last = 0xffffea00061f7480}, co_queue_next = {sqe_next = 0x100000000000}}
+(gdb) frame 4
+#4  0x0000556aed2479a9 in qemu_coroutine_enter (co=0x7fd574300ce0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+119    in /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c
+(gdb) print *co
+$3 = {entry = 0xc00000053, entry_arg = 0x7fd500000001, caller = 0x7fd574300d88, pool_next = {sle_next = 0x7fd574300d90}, co_queue_wakeup = {sqh_first = 0x7fd6ebbd1000, sqh_last = 0x7fd574300e00}, 
+  co_queue_next = {sqe_next = 0xc546a20}}
+(gdb) print *co->caller
+$4 = {entry = 0x230095a58, entry_arg = 0x230095a38, caller = 0x187dd2000, pool_next = {sle_next = 0x187dd1000}, co_queue_wakeup = {sqh_first = 0x187dd0000, sqh_last = 0x187dcf000}, co_queue_next = {
+    sqe_next = 0x184970000}}
+--------------------------------------------------------------------------
+
+The question is, why did qemu_coroutine_enter not complain when in earlier calls co->caller was not NULL?
+
+Another stack trace:
+
+--------------------------------------------------------------------------
+(gdb) bt
+#0  0x00007f2f34690067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
+#1  0x00007f2f34691448 in __GI_abort () at abort.c:89
+#2  0x00005629b8260b6c in qemu_coroutine_enter (co=0x7f2cd6a00940) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:113
+#3  0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cd6a00880) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#4  0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cd6a00880) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#5  0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cee202b00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#6  0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cee202b00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#7  0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cee2141d0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#8  0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cee2141d0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#9  0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf300b370) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#10 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf300b370) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#11 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf1a03560) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#12 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf1a03560) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#13 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf3e15ba0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#14 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf3e15ba0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#15 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2ce80087f0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#16 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2ce80087f0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#17 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cee20d9c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#18 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cee20d9c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#19 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2ceff04850) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#20 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2ceff04850) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#21 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf21061c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#22 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf21061c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#23 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf2105c00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#24 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf2105c00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#25 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf3e1d590) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#26 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf3e1d590) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#27 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf3e16a00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#28 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf3e16a00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#29 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2ce8004da0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#30 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2ce8004da0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#31 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf3e15dc0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#32 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf3e15dc0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#33 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2ccff00420) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#34 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2ccff00420) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#35 0x00005629b8260e74 in qemu_co_queue_run_restart (co=0x7f2cf1e04900) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#36 0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cf1e04900) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#37 0x00005629b8260fa0 in qemu_co_enter_next (queue=queue@entry=0x5629ba5e35e0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:106
+#38 0x00005629b81ff060 in timer_cb (blk=0x5629ba5e3590, is_write=<optimized out>) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/block/throttle-groups.c:400
+#39 0x00005629b81bc615 in timerlist_run_timers (timer_list=0x5629ba64fd40) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/qemu-timer.c:528
+#40 0x00005629b81bc679 in timerlistgroup_run_timers (tlg=tlg@entry=0x5629bb9cd758) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/qemu-timer.c:564
+#41 0x00005629b81bcf47 in aio_dispatch (ctx=ctx@entry=0x5629bb9cd610) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/aio-posix.c:357
+#42 0x00005629b81bd0e8 in aio_poll (ctx=0x5629bb9cd610, blocking=<optimized out>) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/aio-posix.c:479
+#43 0x00005629b801ec79 in iothread_run (opaque=0x5629bb9cd3c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/iothread.c:46
+#44 0x00007f2f34a0e0a4 in start_thread (arg=0x7f2f12fff700) at pthread_create.c:403
+#45 0x00007f2f3474362d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
+--------------------------------------------------------------------------
+
+Looking at the data:
+--------------------------------------------------------------------------
+(gdb) frame 2
+#2  0x00005629b8260b6c in qemu_coroutine_enter (co=0x7f2cd6a00940) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:113
+113    /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c: No such file or directory.
+(gdb) print *co
+$1 = {entry = 0x7f2efbfbc4d8, entry_arg = 0x1, caller = 0x7f2efbfbc4b8, pool_next = {sle_next = 0x10}, co_queue_wakeup = {sqh_first = 0x7f2d217e2000, sqh_last = 0x1000}, co_queue_next = {sqe_next = 0x0}}
+(gdb) print *co->caller
+$2 = {entry = 0x1, entry_arg = 0xc21a480, caller = 0x0, pool_next = {sle_next = 0x0}, co_queue_wakeup = {sqh_first = 0x0, sqh_last = 0xffffea0000567882}, co_queue_next = {sqe_next = 0x100000000000}}
+(gdb) frame 4
+#4  0x00005629b82609a9 in qemu_coroutine_enter (co=0x7f2cd6a00880) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+119    in /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c
+(gdb) print *co
+$3 = {entry = 0x200000046, entry_arg = 0x7f2c00000001, caller = 0x7f2cd6a00928, pool_next = {sle_next = 0x7f2cd6a00930}, co_queue_wakeup = {sqh_first = 0x0, sqh_last = 0x7f2cd6a008a0}, co_queue_next = {
+    sqe_next = 0xc21a480}}
+(gdb) print *co->caller
+$4 = {entry = 0x2301bc4d8, entry_arg = 0x2301bc4b8, caller = 0x159e2000, pool_next = {sle_next = 0x7f2efbfbc4d8}, co_queue_wakeup = {sqh_first = 0x1, sqh_last = 0x7f2efbfbc4b8}, co_queue_next = {
+    sqe_next = 0x10}}
+--------------------------------------------------------------------------
+
+Same as above. If co->caller is not NULL in earlier calls, why have they succeeded?
+
+
+
+
+Third stack trace:
+
+--------------------------------------------------------------------------
+#0  0x00007f4d5ad6a067 in raise () from /lib/x86_64-linux-gnu/libc.so.6
+#1  0x00007f4d5ad6b448 in abort () from /lib/x86_64-linux-gnu/libc.so.6
+#2  0x0000562a4c582b6c in qemu_coroutine_enter (co=0x7f4b1bf0a900) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:113
+#3  0x0000562a4c582e55 in qemu_co_queue_run_restart (co=0x7f4b1bf0a830) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#4  0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b1bf0a830) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#5  0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b1bf0f4c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#6  0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b1bf0f4c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#7  0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e07c40) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#8  0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e07c40) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#9  0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e11420) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#10 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e11420) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#11 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e18c30) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#12 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e18c30) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#13 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b1bf07ea0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#14 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b1bf07ea0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#15 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b1000c0c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#16 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b1000c0c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#17 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e11b10) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#18 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e11b10) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#19 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e10500) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#20 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e10500) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#21 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b1bf0a610) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#22 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b1bf0a610) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#23 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e12820) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#24 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e12820) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#25 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b10002b10) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#26 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b10002b10) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#27 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b1000bfb0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#28 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b1000bfb0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#29 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e103f0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#30 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e103f0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#31 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e078b0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#32 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e078b0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#33 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4adfe02b00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#34 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4adfe02b00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#35 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b15701ae0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#36 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b15701ae0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#37 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e162f0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#38 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e162f0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#39 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b10009fe0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#40 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b10009fe0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#41 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e0b860) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#42 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e0b860) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#43 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b23f035c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#44 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b23f035c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#45 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b19e030c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#46 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b19e030c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#47 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b100051b0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#48 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b100051b0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#49 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4adfe03970) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#50 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4adfe03970) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#51 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e11a00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#52 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e11a00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#53 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e0e0a0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#54 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e0e0a0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#55 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e0ede0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#56 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e0ede0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#57 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4aeff00860) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#58 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4aeff00860) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+---Type <return> to continue, or q <return> to quit---
+#59 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e0d6f0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#60 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e0d6f0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#61 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e0e490) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#62 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e0e490) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#63 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e17370) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#64 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e17370) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#65 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e15c40) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#66 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e15c40) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#67 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b07f00a80) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#68 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b07f00a80) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#69 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b15703250) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#70 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b15703250) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#71 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e17870) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#72 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e17870) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#73 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b15703140) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#74 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b15703140) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#75 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e0c210) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#76 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e0c210) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#77 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e08650) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#78 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e08650) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#79 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e07470) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#80 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e07470) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#81 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b15e03a10) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#82 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b15e03a10) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#83 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e11d90) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#84 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e11d90) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#85 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4b17e13d00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#86 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b17e13d00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#87 0x0000562a4c582e74 in qemu_co_queue_run_restart (co=0x7f4afbe02b00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:60
+#88 0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4afbe02b00) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+#89 0x0000562a4c582fa0 in qemu_co_enter_next (queue=queue@entry=0x562a4d8e65e0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine-lock.c:106
+#90 0x0000562a4c521060 in timer_cb (blk=0x562a4d8e6590, is_write=<optimized out>) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/block/throttle-groups.c:400
+#91 0x0000562a4c4de615 in timerlist_run_timers (timer_list=0x562a4d952d40) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/qemu-timer.c:528
+#92 0x0000562a4c4de679 in timerlistgroup_run_timers (tlg=tlg@entry=0x562a4ecd0758) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/qemu-timer.c:564
+#93 0x0000562a4c4def47 in aio_dispatch (ctx=ctx@entry=0x562a4ecd0610) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/aio-posix.c:357
+#94 0x0000562a4c4df0e8 in aio_poll (ctx=0x562a4ecd0610, blocking=<optimized out>) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/aio-posix.c:479
+#95 0x0000562a4c340c79 in iothread_run (opaque=0x562a4ecd03c0) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/iothread.c:46
+#96 0x00007f4d5b0e80a4 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
+#97 0x00007f4d5ae1d62d in clone () from /lib/x86_64-linux-gnu/libc.so.6
+--------------------------------------------------------------------------
+
+Looking at the data:
+--------------------------------------------------------------------------
+(gdb) frame 2
+#2  0x0000562a4c582b6c in qemu_coroutine_enter (co=0x7f4b1bf0a900) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:113
+113    /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c: No such file or directory.
+(gdb) print *co
+$1 = {entry = 0x7f4d23f20198, entry_arg = 0x1, caller = 0x7f4d23f20178, pool_next = {sle_next = 0x10}, co_queue_wakeup = {sqh_first = 0x7f4c605fb000, sqh_last = 0x1000}, co_queue_next = {
+    sqe_next = 0x7f4c584f5000}}
+(gdb) print *co->caller
+$2 = {entry = 0x400400000001, entry_arg = 0x5000ac0, caller = 0x0, pool_next = {sle_next = 0x0}, co_queue_wakeup = {sqh_first = 0x0, sqh_last = 0xffffea0005b1fec0}, co_queue_next = {sqe_next = 0x100000000000}}
+(gdb) frame 4
+#4  0x0000562a4c5829a9 in qemu_coroutine_enter (co=0x7f4b1bf0a830) at /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c:119
+119    in /build/pb-qemu-pssKUp/pb-qemu-2.7.0/util/qemu-coroutine.c
+(gdb) print *co
+$5 = {entry = 0x7f4b180001d8, entry_arg = 0x7f4b180001d8, caller = 0x7f4b1bf0a8d8, pool_next = {sle_next = 0x7f4b1bf0a8e0}, co_queue_wakeup = {sqh_first = 0x7f4c584f5000, sqh_last = 0x7f4b1bf0a910}, 
+  co_queue_next = {sqe_next = 0x5000ac0}}
+(gdb) print *co->caller
+$6 = {entry = 0x230120198, entry_arg = 0x230120178, caller = 0x16c7fb000, pool_next = {sle_next = 0x1646f5000}, co_queue_wakeup = {sqh_first = 0x1718c2000, sqh_last = 0x7f4d23f20198}, co_queue_next = {
+    sqe_next = 0x1}}
+--------------------------------------------------------------------------
+
+Same thing.
+
+On Wed, Mar 15, 2017 at 04:02:55PM -0000, Mohammed Gamal wrote:
+> I've been experiencing frequent SIGABRTs (in addition to segfaults in
+> #1671876) lately with qemu 2.7.0 running Ubuntu 16.04 guests. The crash
+> usually happens in qemu_coroutine_enter(). I haven't seen this so far
+> with any other guests or distros.
+
+Please report this against the Ubuntu package, not the upstream QEMU
+project.
+
+If the abort reproduces with qemu.git/master or QEMU 2.9-rc0 then it
+would be appropriate for the upstream QEMU bug tracker.
+
+Thanks,
+Stefan
+
+
+Fixed by commit 528f449f590829b53ea01ed91817a695b540421d
+