restructure results

1 files changed, 67 insertions, 0 deletions

diff --git a/results/classifier/zero-shot-user-mode/runtime/1765970 b/results/classifier/zero-shot-user-mode/runtime/1765970
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--- /dev/null
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+runtime: 0.381
+instruction: 0.310
+syscall: 0.309
+
+
+
+qemu-arm (user mode) segfaults in uclibc-ng chroot after upgrade to 2.11.x
+
+I use a qemu-user chroot + binfmt to build software targetting a raspberry pi.  After upgrading from qemu-2.10.1 to 2.11.1 (Gentoo host), I noticed that on my uclibc-ng chroot qemu-arm will segfault when running python and importing the portage module.
+
+I have bisected qemu down to this commit:
+
+https://github.com/qemu/qemu/commit/18e80c55bb6ec17c05ec0ba717ec83933c2bfc07
+
+If I recompile and change MAX_RESERVED_VA (from the above commit) back to 0x77000000 the problem goes away.  NB I have no idea what that does, I just thought I'd see.
+
+
+Other arm chroots (glibc, musl) do not segfault with qemu-2.11, only the uclibc-ng one.  Not sure why.
+
+
+The following backtrace was generated from running qemu-arm in gdb and recreating the segfault:
+
+(gdb) where
+#0  0x0000000060726046 in static_code_gen_buffer ()
+#1  0x0000000060048789 in cpu_tb_exec (cpu=0x6278e310, 
+    itb=0x60725f80 <static_code_gen_buffer+314624>)
+    at /usr/src/debug/app-emulation/qemu-2.11.1-r2/qemu-2.11.1/accel/tcg/cpu-exec.c:167
+#2  0x000000006004937f in cpu_loop_exec_tb (cpu=0x6278e310, 
+    tb=0x60725f80 <static_code_gen_buffer+314624>, last_tb=0x7fffffffd138, 
+    tb_exit=0x7fffffffd130)
+    at /usr/src/debug/app-emulation/qemu-2.11.1-r2/qemu-2.11.1/accel/tcg/cpu-exec.c:627
+#3  0x0000000060049600 in cpu_exec (cpu=0x6278e310)
+    at /usr/src/debug/app-emulation/qemu-2.11.1-r2/qemu-2.11.1/accel/tcg/cpu-exec.c:736
+#4  0x00000000600511c3 in cpu_loop (env=0x627965b0)
+    at /usr/src/debug/app-emulation/qemu-2.11.1-r2/qemu-2.11.1/linux-user/main.c:585
+#5  0x00000000600534eb in main (argc=4, argv=0x7fffffffd9b8, 
+    envp=0x7fffffffd9e0)
+    at /usr/src/debug/app-emulation/qemu-2.11.1-r2/qemu-2.11.1/linux-user/main.c:4882
+
+
+
+(gdb) info reg
+rax            0x627965b0       1652123056
+rbx            0x62717870       1651603568
+rcx            0x606da000       1617797120
+rdx            0x60726000       1618108416
+rsi            0x60726000       1618108416
+rdi            0x627965b0       1652123056
+rbp            0x7fffffffd0c0   0x7fffffffd0c0
+rsp            0x7fffffffd080   0x7fffffffd080
+r8             0x0      0
+r9             0x2      2
+r10            0x0      0
+r11            0x629280a0       1653768352
+r12            0x60260e40       1613106752
+r13            0x0      0
+r14            0x606a5018       1617580056
+r15            0x0      0
+rip            0x60048789       0x60048789 <cpu_tb_exec+266>
+eflags         0x10282  [ SF IF RF ]
+cs             0x33     51
+ss             0x2b     43
+ds             0x0      0
+es             0x0      0
+fs             0x0      0
+gs             0x0      0
+(gdb)
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