1 files changed, 109 insertions, 0 deletions
diff --git a/results/classifier/118/unknown/1052 b/results/classifier/118/unknown/1052
new file mode 100644
index 000000000..bb8c60226
--- /dev/null
+++ b/results/classifier/118/unknown/1052
@@ -0,0 +1,109 @@
+ppc: 0.908
+register: 0.898
+VMM: 0.893
+permissions: 0.891
+graphic: 0.888
+hypervisor: 0.887
+debug: 0.886
+performance: 0.881
+peripherals: 0.881
+vnc: 0.874
+TCG: 0.870
+semantic: 0.863
+KVM: 0.862
+device: 0.854
+virtual: 0.854
+x86: 0.851
+mistranslation: 0.842
+i386: 0.840
+architecture: 0.833
+assembly: 0.810
+PID: 0.809
+arm: 0.800
+risc-v: 0.799
+kernel: 0.786
+socket: 0.785
+user-level: 0.779
+network: 0.773
+boot: 0.762
+files: 0.754
+
+QEMU monitor hangs after "stop" QMP command called in postcopy-paused migration state
+Description of problem:
+QEMU monitor hangs when I try to pause virtual CPUs using "stop" QMP command
+on the destination host once migration enters postcopy-paused (after it was
+paused using "migrate-pause" QMP command on the source host). QEMU just does
+not send any reply to the "stop" command.
+Steps to reproduce:
+1. start migration
+2. wait for the first iteration to finish
+3. switch to post-copy using "migrate-start-postcopy"
+3. break migration with "migrate-pause"
+4. send "stop" to the destination monitor
+Additional information:
+Unfortunately I haven't been able to get a stack trace as gdb just hangs when
+I try to attach it to QEMU after step 4. I can see threads getting SIGUSR1
+after the "stop" command, but I cannot get to gdb prompt afterwards:
+
+```
+(gdb) c
+Continuing.
+[New Thread 0x7f41ec9be640 (LWP 1112)]
+[New Thread 0x7f41d7fff640 (LWP 1113)]
+Thread 4 "CPU 0/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 5 "CPU 1/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 4 "CPU 0/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 5 "CPU 1/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 4 "CPU 0/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 5 "CPU 1/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 4 "CPU 0/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 5 "CPU 1/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 4 "CPU 0/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 5 "CPU 1/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 4 "CPU 0/KVM" received signal SIGUSR1, User defined signal 1.
+Thread 4 "CPU 0/KVM" received signal SIGUSR1, User defined signal 1.
+```
+
+I was able to attach strace to it though (in case it is at least a bit
+useful). The first line corresponds to the final '}' of the
+{"execute":"stop","id":"libvirt-413"} QMP comamnd:
+
+```
+[pid 72970] recvmsg(20, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="}", iov_len=1}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 1
+[pid 72970] write(4, "\1\0\0\0\0\0\0\0", 8) = 8
+[pid 72949] <... ppoll resumed>)        = 1 ([{fd=4, revents=POLLIN}], left {tv_sec=0, tv_nsec=513181335})
+[pid 72970] write(19, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
+[pid 72949] read(4,  <unfinished ...>
+[pid 72970] <... write resumed>)        = 8
+[pid 72949] <... read resumed>"\1\0\0\0\0\0\0\0", 512) = 8
+[pid 72970] write(19, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
+[pid 72949] ppoll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=11, events=POLLIN}, {fd=12, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24, events=POLLIN}, {fd=29, events=POLLIN}, {fd=30, events=POLLIN}, {fd=31, events=POLLIN}, {fd=32, events=POLLIN}, {fd=33, events=POLLIN}, {fd=34, events=POLLIN}, {fd=38, events=POLLIN}, {fd=40, events=POLLIN}, {fd=41, events=POLLIN}, {fd=42, events=POLLIN}, {fd=43, events=POLLIN}, {fd=44, events=POLLIN}, {fd=45, events=POLLIN}, {fd=46, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=49, events=POLLIN}, {fd=50, events=POLLIN}, {fd=51, events=POLLIN}, {fd=52, events=POLLIN}, {fd=53, events=POLLIN}, {fd=54, events=POLLIN}, {fd=55, events=POLLIN}, {fd=56, events=POLLIN}, ...], 74, {tv_sec=0, tv_nsec=0}, NULL, 8 <unfinished ...>
+[pid 72970] <... write resumed>)        = 8
+[pid 72949] <... ppoll resumed>)        = 0 (Timeout)
+[pid 72970] write(19, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
+[pid 72949] write(8, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
+[pid 72970] <... write resumed>)        = 8
+[pid 72949] <... write resumed>)        = 8
+[pid 72970] write(19, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
+[pid 72949] ppoll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=11, events=POLLIN}, {fd=12, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24, events=POLLIN}, {fd=29, events=POLLIN}, {fd=30, events=POLLIN}, {fd=31, events=POLLIN}, {fd=32, events=POLLIN}, {fd=33, events=POLLIN}, {fd=34, events=POLLIN}, {fd=38, events=POLLIN}, {fd=40, events=POLLIN}, {fd=41, events=POLLIN}, {fd=42, events=POLLIN}, {fd=43, events=POLLIN}, {fd=44, events=POLLIN}, {fd=45, events=POLLIN}, {fd=46, events=POLLIN}, {fd=47, events=POLLIN}, {fd=48, events=POLLIN}, {fd=49, events=POLLIN}, {fd=50, events=POLLIN}, {fd=51, events=POLLIN}, {fd=52, events=POLLIN}, {fd=53, events=POLLIN}, {fd=54, events=POLLIN}, {fd=55, events=POLLIN}, {fd=56, events=POLLIN}, ...], 74, {tv_sec=0, tv_nsec=0}, NULL, 8 <unfinished ...>
+[pid 72970] <... write resumed>)        = 8
+[pid 72949] <... ppoll resumed>)        = 1 ([{fd=8, revents=POLLIN}], left {tv_sec=0, tv_nsec=0})
+[pid 72970] poll([{fd=18, events=POLLIN}, {fd=19, events=POLLIN}, {fd=20, events=0}], 3, -1 <unfinished ...>
+[pid 72949] rt_sigprocmask(SIG_BLOCK, ~[],  <unfinished ...>
+[pid 72970] <... poll resumed>)         = 1 ([{fd=19, revents=POLLIN}])
+[pid 72949] <... rt_sigprocmask resumed>[BUS USR1 ALRM IO], 8) = 0
+[pid 72970] read(19,  <unfinished ...>
+[pid 72949] getpid()                    = 72949
+[pid 72970] <... read resumed>"\5\0\0\0\0\0\0\0", 16) = 8
+[pid 72949] tgkill(72949, 72971, SIGUSR1 <unfinished ...>
+[pid 72970] poll([{fd=18, events=POLLIN}, {fd=19, events=POLLIN}, {fd=20, events=0}], 3, -1 <unfinished ...>
+[pid 72949] <... tgkill resumed>)       = 0
+[pid 72949] rt_sigprocmask(SIG_SETMASK, [BUS USR1 ALRM IO], NULL, 8) = 0
+[pid 72949] rt_sigprocmask(SIG_BLOCK, ~[], [BUS USR1 ALRM IO], 8) = 0
+[pid 72949] getpid()                    = 72949
+[pid 72949] tgkill(72949, 72972, SIGUSR1) = 0
+[pid 72949] rt_sigprocmask(SIG_SETMASK, [BUS USR1 ALRM IO], NULL, 8) = 0
+[pid 72949] futex(0x5606f6cb73a8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY
+```
+
+And that's it, the last futex never returns.