Re: WARNING in set_restore_sigmask
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Dmitry Vyukov
Jan 29, 2016, 4:24:25 AM1/29/16
to Oleg Nesterov, Andrew Morton, Richard Weinberger, Amanieu d'Antras, Chris Metcalf, Andy Lutomirski, Davidlohr Bueso, Vladimir Davydov, Palmer Dabbelt, LKML, Thomas Gleixner, Ingo Molnar, H. Peter Anvin, syzkaller, Kostya Serebryany, Alexander Potapenko, Sasha Levin
On Fri, Jan 29, 2016 at 10:16 AM, Dmitry Vyukov <dvy...@google.com> wrote:
> Hello,
>
> I've got the following WARNING while running syzkaller fuzzer:
>
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 10905 at ./arch/x86/include/asm/thread_info.h:236
> sigsuspend+0x18e/0x1f0()
> Modules linked in:
> CPU: 2 PID: 10905 Comm: syz-executor Not tainted 4.5.0-rc1+ #300
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> 00000000ffffffff ffff88006139fe38 ffffffff82be118d 0000000000000000
> ffff88006d054740 ffffffff867387e0 ffff88006139fe78 ffffffff813536d9
> ffffffff813839ce ffffffff867387e0 00000000000000ec 0000000020000000
> Call Trace:
> [< inline >] __dump_stack lib/dump_stack.c:15
> [<ffffffff82be118d>] dump_stack+0x6f/0xa2 lib/dump_stack.c:50
> [<ffffffff813536d9>] warn_slowpath_common+0xd9/0x140 kernel/panic.c:482
> [<ffffffff81353909>] warn_slowpath_null+0x29/0x30 kernel/panic.c:515
> [< inline >] set_restore_sigmask
> ./arch/x86/include/asm/thread_info.h:236
> [<ffffffff813839ce>] sigsuspend+0x18e/0x1f0 kernel/signal.c:3513
> [< inline >] SYSC_rt_sigsuspend kernel/signal.c:3533
> [<ffffffff81387d7c>] SyS_rt_sigsuspend+0xac/0xe0 kernel/signal.c:3523
> [<ffffffff86653236>] entry_SYSCALL_64_fastpath+0x16/0x7a
> arch/x86/entry/entry_64.S:185
> ---[ end trace da5c27e3b7defd96 ]---
>
> Unfortunately I cannot reproduce it. But the only two programs that
> contain rt_sigsuspend that were executed before the warning are:
> https://gist.githubusercontent.com/dvyukov/cacf219b67de2aa08733/raw/de22347ab1ebd0c90dc7f8af9b348ba143b7ba6c/gistfile1.txt
> https://gist.githubusercontent.com/dvyukov/2b419fac83636e7ba0e3/raw/0b32b477180f385d6430b2186f1e474c3bb5a829/gistfile1.txt
> Note that most syscalls there are redherring, because I don't have
> /dev/audio7 nor /dev/fd5. So ioctls are fail, and shmget also fails.
> These programs call exit(0) and can SIGSEGV concurrently, though.
>
> I am on commit 92e963f50fc74041b5e9e744c330dca48e04f08d
+syzkaller group
> Hello,
>
> I've got the following WARNING while running syzkaller fuzzer:
>
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 10905 at ./arch/x86/include/asm/thread_info.h:236
> sigsuspend+0x18e/0x1f0()
> Modules linked in:
> CPU: 2 PID: 10905 Comm: syz-executor Not tainted 4.5.0-rc1+ #300
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> 00000000ffffffff ffff88006139fe38 ffffffff82be118d 0000000000000000
> ffff88006d054740 ffffffff867387e0 ffff88006139fe78 ffffffff813536d9
> ffffffff813839ce ffffffff867387e0 00000000000000ec 0000000020000000
> Call Trace:
> [< inline >] __dump_stack lib/dump_stack.c:15
> [<ffffffff82be118d>] dump_stack+0x6f/0xa2 lib/dump_stack.c:50
> [<ffffffff813536d9>] warn_slowpath_common+0xd9/0x140 kernel/panic.c:482
> [<ffffffff81353909>] warn_slowpath_null+0x29/0x30 kernel/panic.c:515
> [< inline >] set_restore_sigmask
> ./arch/x86/include/asm/thread_info.h:236
> [<ffffffff813839ce>] sigsuspend+0x18e/0x1f0 kernel/signal.c:3513
> [< inline >] SYSC_rt_sigsuspend kernel/signal.c:3533
> [<ffffffff81387d7c>] SyS_rt_sigsuspend+0xac/0xe0 kernel/signal.c:3523
> [<ffffffff86653236>] entry_SYSCALL_64_fastpath+0x16/0x7a
> arch/x86/entry/entry_64.S:185
> ---[ end trace da5c27e3b7defd96 ]---
>
> Unfortunately I cannot reproduce it. But the only two programs that
> contain rt_sigsuspend that were executed before the warning are:
> https://gist.githubusercontent.com/dvyukov/cacf219b67de2aa08733/raw/de22347ab1ebd0c90dc7f8af9b348ba143b7ba6c/gistfile1.txt
> https://gist.githubusercontent.com/dvyukov/2b419fac83636e7ba0e3/raw/0b32b477180f385d6430b2186f1e474c3bb5a829/gistfile1.txt
> Note that most syscalls there are redherring, because I don't have
> /dev/audio7 nor /dev/fd5. So ioctls are fail, and shmget also fails.
> These programs call exit(0) and can SIGSEGV concurrently, though.
>
> I am on commit 92e963f50fc74041b5e9e744c330dca48e04f08d
+syzkaller group
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