linux-kernel - Re: WARNING in set_restore

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Date:	Fri, 29 Jan 2016 10:24:05 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Weinberger <richard@....at>,
	"Amanieu d'Antras" <amanieu@...il.com>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Andy Lutomirski <luto@...capital.net>,
	Davidlohr Bueso <dave@...olabs.net>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: WARNING in set_restore_sigmask

On Fri, Jan 29, 2016 at 10:16 AM, Dmitry Vyukov <dvyukov@...gle.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