Public bug reported:
In a multithreaded program running under qemu-sh4 (version 2.9.0),
thread termination and/or pthread_join is not working right.
The attached program works natively on all kinds of platforms, and under
qemu user mode emulation for at least alpha, armelhf, aarch64,
powerpc64le.
How to reproduce:
- Compile the program: sh4-linux-gnu-gcc-5 -O -Wall -lpthread -o test-tls
test-tls.c
- Set environment variables for running qemu-sh4.
- ~/inst-qemu/2.9.0/bin/qemu-sh4 test-tls
Expected behaviour: After the "Worker xxxxx dying" line, the main()
function prints "OK", and the program terminates.
Actual behaviour (only on sh4): After the "Worker xxxxx dying" line, it hangs.
Attaching gdb to qemu shows 15 threads with a stack trace like
#0 safe_syscall_base () at
/build/qemu-2.9.0/linux-user/host/x86_64/safe-syscall.inc.S:75
#1 0x00005584f86f4c48 in safe_futex (uaddr=<optimized out>, op=op@entry=128,
val=val@entry=2, timeout=<optimized out>, uaddr2=uaddr2@entry=0x0,
val3=val3@entry=-161181992) at /build/qemu-2.9.0/linux-user/syscall.c:921
#2 0x00005584f870353b in do_futex (val3=-161181992, uaddr2=4134624624,
timeout=0, val=<optimized out>, op=<optimized out>, uaddr=<optimized out>)
at /build/qemu-2.9.0/linux-user/syscall.c:7147
#3 do_syscall (cpu_env=<optimized out>, num=240, arg1=<optimized out>,
arg2=<optimized out>, arg3=<optimized out>, arg4=0, arg5=-160342672,
arg6=-161181992, arg7=0, arg8=0) at
/build/qemu-2.9.0/linux-user/syscall.c:11692
#4 0x00005584f86f454a in cpu_loop (env=env@entry=0x5584fb3d04f8) at
/build/qemu-2.9.0/linux-user/main.c:2676
#5 0x00005584f86f5dd5 in clone_func (arg=0x7fff4d485c20) at
/build/qemu-2.9.0/linux-user/syscall.c:6234
#6 0x00007f08f05a46ba in start_thread (arg=0x7f08f1368700) at
pthread_create.c:333
#7 0x00007f08f02da3dd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
and 1 thread with a stack trace like
#0 safe_syscall_base () at
/build/qemu-2.9.0/linux-user/host/x86_64/safe-syscall.inc.S:75
#1 0x00005584f86f4c48 in safe_futex (uaddr=<optimized out>, op=op@entry=0,
val=val@entry=18875, timeout=<optimized out>, uaddr2=uaddr2@entry=0x0,
val3=val3@entry=-161180376) at /build/qemu-2.9.0/linux-user/syscall.c:921
#2 0x00005584f870353b in do_futex (val3=-161180376, uaddr2=4135101768,
timeout=0, val=<optimized out>, op=<optimized out>, uaddr=<optimized out>)
at /build/qemu-2.9.0/linux-user/syscall.c:7147
#3 do_syscall (cpu_env=<optimized out>, num=240, arg1=<optimized out>,
arg2=<optimized out>, arg3=<optimized out>, arg4=0, arg5=-159865528,
arg6=-161180376, arg7=0, arg8=0) at
/build/qemu-2.9.0/linux-user/syscall.c:11692
#4 0x00005584f86f454a in cpu_loop (env=0x5584fb3b99a8) at
/build/qemu-2.9.0/linux-user/main.c:2676
#5 0x00005584f86c12d3 in main (argc=<optimized out>, argv=0x7fff4d4878b8,
envp=<optimized out>)
at /build/qemu-2.9.0/linux-user/main.c:4860
and 1 thread with a stack trace like
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00005584f876eab5 in qemu_futex_wait (val=<optimized out>, f=<optimized
out>) at /build/qemu-2.9.0/include/qemu/futex.h:26
#2 qemu_event_wait (ev=ev@entry=0x5584faa43d84 <rcu_call_ready_event>) at
/build/qemu-2.9.0/util/qemu-thread-posix.c:399
#3 0x00005584f87748ce in call_rcu_thread (opaque=<optimized out>) at
/build/qemu-2.9.0/util/rcu.c:249
#4 0x00007f08f05a46ba in start_thread (arg=0x7f08eff62700) at
pthread_create.c:333
#5 0x00007f08f02da3dd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
** Affects: qemu
Importance: Undecided
Status: New
** Attachment added: "source code of test program"
https://bugs.launchpad.net/bugs/1701971/+attachment/4908117/+files/test-tls.c
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https://bugs.launchpad.net/bugs/1701971
Title:
multithreading not working right under qemu user mode for sh4
Status in QEMU:
New
Bug description:
In a multithreaded program running under qemu-sh4 (version 2.9.0),
thread termination and/or pthread_join is not working right.
The attached program works natively on all kinds of platforms, and
under qemu user mode emulation for at least alpha, armelhf, aarch64,
powerpc64le.
How to reproduce:
- Compile the program: sh4-linux-gnu-gcc-5 -O -Wall -lpthread -o test-tls
test-tls.c
- Set environment variables for running qemu-sh4.
- ~/inst-qemu/2.9.0/bin/qemu-sh4 test-tls
Expected behaviour: After the "Worker xxxxx dying" line, the main()
function prints "OK", and the program terminates.
Actual behaviour (only on sh4): After the "Worker xxxxx dying" line, it
hangs. Attaching gdb to qemu shows 15 threads with a stack trace like
#0 safe_syscall_base () at
/build/qemu-2.9.0/linux-user/host/x86_64/safe-syscall.inc.S:75
#1 0x00005584f86f4c48 in safe_futex (uaddr=<optimized out>, op=op@entry=128,
val=val@entry=2, timeout=<optimized out>, uaddr2=uaddr2@entry=0x0,
val3=val3@entry=-161181992) at /build/qemu-2.9.0/linux-user/syscall.c:921
#2 0x00005584f870353b in do_futex (val3=-161181992, uaddr2=4134624624,
timeout=0, val=<optimized out>, op=<optimized out>, uaddr=<optimized out>)
at /build/qemu-2.9.0/linux-user/syscall.c:7147
#3 do_syscall (cpu_env=<optimized out>, num=240, arg1=<optimized out>,
arg2=<optimized out>, arg3=<optimized out>, arg4=0, arg5=-160342672,
arg6=-161181992, arg7=0, arg8=0) at
/build/qemu-2.9.0/linux-user/syscall.c:11692
#4 0x00005584f86f454a in cpu_loop (env=env@entry=0x5584fb3d04f8) at
/build/qemu-2.9.0/linux-user/main.c:2676
#5 0x00005584f86f5dd5 in clone_func (arg=0x7fff4d485c20) at
/build/qemu-2.9.0/linux-user/syscall.c:6234
#6 0x00007f08f05a46ba in start_thread (arg=0x7f08f1368700) at
pthread_create.c:333
#7 0x00007f08f02da3dd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
and 1 thread with a stack trace like
#0 safe_syscall_base () at
/build/qemu-2.9.0/linux-user/host/x86_64/safe-syscall.inc.S:75
#1 0x00005584f86f4c48 in safe_futex (uaddr=<optimized out>, op=op@entry=0,
val=val@entry=18875, timeout=<optimized out>, uaddr2=uaddr2@entry=0x0,
val3=val3@entry=-161180376) at /build/qemu-2.9.0/linux-user/syscall.c:921
#2 0x00005584f870353b in do_futex (val3=-161180376, uaddr2=4135101768,
timeout=0, val=<optimized out>, op=<optimized out>, uaddr=<optimized out>)
at /build/qemu-2.9.0/linux-user/syscall.c:7147
#3 do_syscall (cpu_env=<optimized out>, num=240, arg1=<optimized out>,
arg2=<optimized out>, arg3=<optimized out>, arg4=0, arg5=-159865528,
arg6=-161180376, arg7=0, arg8=0) at
/build/qemu-2.9.0/linux-user/syscall.c:11692
#4 0x00005584f86f454a in cpu_loop (env=0x5584fb3b99a8) at
/build/qemu-2.9.0/linux-user/main.c:2676
#5 0x00005584f86c12d3 in main (argc=<optimized out>, argv=0x7fff4d4878b8,
envp=<optimized out>)
at /build/qemu-2.9.0/linux-user/main.c:4860
and 1 thread with a stack trace like
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00005584f876eab5 in qemu_futex_wait (val=<optimized out>, f=<optimized
out>) at /build/qemu-2.9.0/include/qemu/futex.h:26
#2 qemu_event_wait (ev=ev@entry=0x5584faa43d84 <rcu_call_ready_event>) at
/build/qemu-2.9.0/util/qemu-thread-posix.c:399
#3 0x00005584f87748ce in call_rcu_thread (opaque=<optimized out>) at
/build/qemu-2.9.0/util/rcu.c:249
#4 0x00007f08f05a46ba in start_thread (arg=0x7f08eff62700) at
pthread_create.c:333
#5 0x00007f08f02da3dd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
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