Public bug reported:
When MTTCG is enabled, QEMU 3.1.0 sometimes crashes when running the
following command line:
qemu-system-i386 -kernel
/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/bootstrap
-append bootstrap -initrd
"/home/jermar/work/software/l4/fiasco/.build-i386/fiasco
-serial_esc,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/sigma0
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/moe
rom/ahci.cfg,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/ned
,test_env.lua ,/home/jermar/Kernkonzept/software/l4/pkg/ahci-
driver/examples/md5sum/ahci.cfg
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/l4re
,/home/jermar/Kernkonzept/software/l4/pkg/ahci-
driver/examples/md5sum/ahci.io
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/io
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/ahci-
drv ,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f
/ahci-md5-sync" -smp 4 -accel tcg,thread=multi -device ahci,id=ahci0
-drive if=none,file=/home/jermar/Kernkonzept/software/l4/.build-i386/pkg
/ahci-driver/test/examples/test_ahci.img,format=raw,id=drive-sata0-0-0
-device ide-drive,bus=ahci0.0,drive=drive-sata0-0-0,id=sata0-0-0 -serial
stdio -nographic -monitor none
The host is x86_64.
The stack at the time of the crash (core dump and debug binary linked
below[1]):
Core was generated by `qemu-system-i386 -kernel
/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 io_writex (env=env@entry=0x565355ca0140,
iotlbentry=iotlbentry@entry=0x565355ca9120, mmu_idx=2, val=val@entry=0,
addr=addr@entry=3938451632, retaddr=retaddr@entry=140487132809203,
recheck=false, size=4)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cputlb.c:791
791 if (mr->global_locking && !qemu_mutex_iothread_locked()) {
[Current thread is 1 (Thread 0x7fc5af7fe700 (LWP 3625719))]
Missing separate debuginfos, use: dnf debuginfo-install
SDL2-2.0.9-1.fc29.x86_64 at-spi2-atk-2.30.0-1.fc29.x86_64
at-spi2-core-2.30.0-2.fc29.x86_64 atk-2.30.0-1.fc29.x86_64
bzip2-libs-1.0.6-28.fc29.x86_64 cairo4
(gdb) bt
#0 0x0000565354f5f365 in io_writex
(env=env@entry=0x565355ca0140, iotlbentry=iotlbentry@entry=0x565355ca9120,
mmu_idx=2, val=val@entry=0, addr=addr@entry=3938451632,
retaddr=retaddr@entry=140487132809203, recheck=false, size=4)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cputlb.c:791
#1 0x0000565354f621b2 in io_writel (recheck=<optimized out>,
retaddr=140487132809203, addr=3938451632, val=0, index=0, mmu_idx=2,
env=0x565355ca0140)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/softmmu_template.h:310
#2 0x0000565354f621b2 in helper_le_stl_mmu (env=0x565355ca0140,
addr=<optimized out>, val=0, oi=34, retaddr=140487132809203)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/softmmu_template.h:310
#3 0x00007fc5b5a587f3 in code_gen_buffer ()
#4 0x0000565354f75fd0 in cpu_tb_exec (itb=<optimized out>, cpu=0x7fc5b5a5aa40
<code_gen_buffer+12266006>) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cpu-exec.c:171
#5 0x0000565354f75fd0 in cpu_loop_exec_tb (tb_exit=<synthetic pointer>,
last_tb=<synthetic pointer>, tb=<optimized out>, cpu=0x7fc5b5a5aa40
<code_gen_buffer+12266006>)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cpu-exec.c:615
#6 0x0000565354f75fd0 in cpu_exec (cpu=cpu@entry=0x565355c97e90) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cpu-exec.c:725
#7 0x0000565354f33b1f in tcg_cpu_exec (cpu=0x565355c97e90) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/cpus.c:1429
#8 0x0000565354f35e83 in qemu_tcg_cpu_thread_fn (arg=0x565355c97e90) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/cpus.c:1733
#9 0x0000565354f35e83 in qemu_tcg_cpu_thread_fn (arg=arg@entry=0x565355c97e90)
at /home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/cpus.c:1707
#10 0x00005653552ec5da in qemu_thread_start (args=<optimized out>) at
util/qemu-thread-posix.c:498
#11 0x00007fc5b858a58e in start_thread () at /lib64/libpthread.so.0
#12 0x00007fc5b84b96a3 in clone () at /lib64/libc.so.6
Another symptom that occurs more often than this crash is that the guest
hangs while waiting for another CPU to complete a cross-CPU call.
Disabling MTTCG makes both symptoms go away.
[1] Core file + debug binary: http://jermar.eu/ref/qemu-mttcg-
core.tar.xz
** Affects: qemu
Importance: Undecided
Status: New
** Tags: core i386 mttcg
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https://bugs.launchpad.net/bugs/1811244
Title:
qemu 3.1/i386 crashes when MTTCG is enabled
Status in QEMU:
New
Bug description:
When MTTCG is enabled, QEMU 3.1.0 sometimes crashes when running the
following command line:
qemu-system-i386 -kernel
/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/bootstrap
-append bootstrap -initrd
"/home/jermar/work/software/l4/fiasco/.build-i386/fiasco
-serial_esc,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/sigma0
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/moe
rom/ahci.cfg,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/ned
,test_env.lua ,/home/jermar/Kernkonzept/software/l4/pkg/ahci-
driver/examples/md5sum/ahci.cfg
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/l4re
,/home/jermar/Kernkonzept/software/l4/pkg/ahci-
driver/examples/md5sum/ahci.io
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f/io
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f
/ahci-drv
,/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x86_gen/l4f
/ahci-md5-sync" -smp 4 -accel tcg,thread=multi -device ahci,id=ahci0
-drive
if=none,file=/home/jermar/Kernkonzept/software/l4/.build-i386/pkg
/ahci-driver/test/examples/test_ahci.img,format=raw,id=drive-sata0-0-0
-device ide-drive,bus=ahci0.0,drive=drive-sata0-0-0,id=sata0-0-0
-serial stdio -nographic -monitor none
The host is x86_64.
The stack at the time of the crash (core dump and debug binary linked
below[1]):
Core was generated by `qemu-system-i386 -kernel
/home/jermar/Kernkonzept/software/l4/.build-i386/bin/x'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 io_writex (env=env@entry=0x565355ca0140,
iotlbentry=iotlbentry@entry=0x565355ca9120, mmu_idx=2, val=val@entry=0,
addr=addr@entry=3938451632, retaddr=retaddr@entry=140487132809203,
recheck=false, size=4)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cputlb.c:791
791 if (mr->global_locking && !qemu_mutex_iothread_locked()) {
[Current thread is 1 (Thread 0x7fc5af7fe700 (LWP 3625719))]
Missing separate debuginfos, use: dnf debuginfo-install
SDL2-2.0.9-1.fc29.x86_64 at-spi2-atk-2.30.0-1.fc29.x86_64
at-spi2-core-2.30.0-2.fc29.x86_64 atk-2.30.0-1.fc29.x86_64
bzip2-libs-1.0.6-28.fc29.x86_64 cairo4
(gdb) bt
#0 0x0000565354f5f365 in io_writex
(env=env@entry=0x565355ca0140,
iotlbentry=iotlbentry@entry=0x565355ca9120, mmu_idx=2, val=val@entry=0,
addr=addr@entry=3938451632, retaddr=retaddr@entry=140487132809203,
recheck=false, size=4)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cputlb.c:791
#1 0x0000565354f621b2 in io_writel (recheck=<optimized out>,
retaddr=140487132809203, addr=3938451632, val=0, index=0, mmu_idx=2,
env=0x565355ca0140)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/softmmu_template.h:310
#2 0x0000565354f621b2 in helper_le_stl_mmu (env=0x565355ca0140,
addr=<optimized out>, val=0, oi=34, retaddr=140487132809203)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/softmmu_template.h:310
#3 0x00007fc5b5a587f3 in code_gen_buffer ()
#4 0x0000565354f75fd0 in cpu_tb_exec (itb=<optimized out>,
cpu=0x7fc5b5a5aa40 <code_gen_buffer+12266006>) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cpu-exec.c:171
#5 0x0000565354f75fd0 in cpu_loop_exec_tb (tb_exit=<synthetic pointer>,
last_tb=<synthetic pointer>, tb=<optimized out>, cpu=0x7fc5b5a5aa40
<code_gen_buffer+12266006>)
at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cpu-exec.c:615
#6 0x0000565354f75fd0 in cpu_exec (cpu=cpu@entry=0x565355c97e90) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/accel/tcg/cpu-exec.c:725
#7 0x0000565354f33b1f in tcg_cpu_exec (cpu=0x565355c97e90) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/cpus.c:1429
#8 0x0000565354f35e83 in qemu_tcg_cpu_thread_fn (arg=0x565355c97e90) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/cpus.c:1733
#9 0x0000565354f35e83 in qemu_tcg_cpu_thread_fn
(arg=arg@entry=0x565355c97e90) at
/home/jermar/software/HelenOS/helenos.git/contrib/qemu/qemu-3.1.0/cpus.c:1707
#10 0x00005653552ec5da in qemu_thread_start (args=<optimized out>) at
util/qemu-thread-posix.c:498
#11 0x00007fc5b858a58e in start_thread () at /lib64/libpthread.so.0
#12 0x00007fc5b84b96a3 in clone () at /lib64/libc.so.6
Another symptom that occurs more often than this crash is that the
guest hangs while waiting for another CPU to complete a cross-CPU
call. Disabling MTTCG makes both symptoms go away.
[1] Core file + debug binary: http://jermar.eu/ref/qemu-mttcg-
core.tar.xz
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