At the top of function cpu_unlink_tb() in translate-all.c:
/* FIXME: TB unchaining isn't SMP safe. For now just ignore the
problem and hope the cpu will stop of its own accord. For userspace
emulation this often isn't actually as bad as it sounds. Often
signals are used primarily to interrupt blocking syscalls. */
--
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https://bugs.launchpad.net/bugs/1098729
Title:
qemu-user-static for armhf: segfault in threaded code
Status in QEMU:
New
Bug description:
Currently running QEMU from git (fedf2de31023) and running the armhf version
of qemu-user-static which I have renamed qemu-armhf-static to follow the naming
convention used in Debian.
The host systems is a Debian testing x86_64-linux and I have an Debian
testing armhf chroot which I invoke using schroot.
Majority of program in the armhf chroot run fine, but I'm getting qemu
segfaults in multi-threaded programs.
As an example, I've grabbed the threads demo program here:
https://computing.llnl.gov/tutorials/pthreads/samples/dotprod_mutex.c
and changed NUMTHRDS from 4 to 10. I compile it as (same compile
command on both x86_64 host and armhf guest):
gcc -Wall -lpthread dotprod_mutex.c -o dotprod_mutex
When compiled for x86_64 host it runs perfectly and even under
Valgrind displays no errors whatsoever.
However, when I compile the program in my armhs chroot and run it it
usually (but not always) segaults or hangs or crashes. Example output:
(armhf) $ ./dotprod_mutex
Thread 1 did 100000 to 200000: mysum=100000.000000 global
sum=100000.000000
Thread 0 did 0 to 100000: mysum=100000.000000 global sum=200000.000000
TCG temporary leak before f6731ca0
qemu-arm-static:
/home/erikd/Git/qemu-posix-timer-hacking/Upstream/tcg/tcg-op.h:2371:
tcg_gen_goto_tb: Assertion `(tcg_ctx.goto_tb_issue_mask & (1 << idx)) ==
0' failed.
(armhf) $ ./dotprod_mutex
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault
(armhf) $ ./dotprod_mutex
qemu-arm-static:
/home/erikd/Git/qemu-posix-timer-hacking/Upstream/tcg/tcg.c:519:
tcg_temp_free_internal: Assertion `idx >= s->nb_globals && idx <
s->nb_temps' failed.
(armhf) $ ./dotprod_mutex
Thread 1 did 100000 to 200000: mysum=100000.000000 global
sum=100000.000000
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault
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