linux-kernel - Re: [syzbot] upstream boot error: WARNING in __context_tracking

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Date:   Fri, 19 Mar 2021 10:54:48 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+f09a12b2c77bfbbf51bd@...kaller.appspotmail.com>,
        Mark Rutland <mark.rutland@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Cc:     Alexandre Chartre <alexandre.chartre@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [syzbot] upstream boot error: WARNING in __context_tracking_enter

.On Fri, Mar 19, 2021 at 10:44 AM syzbot
<syzbot+f09a12b2c77bfbbf51bd@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    8b12a62a Merge tag 'drm-fixes-2021-03-19' of git://anongit..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17e815aed00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cfeed364fc353c32
> dashboard link: https://syzkaller.appspot.com/bug?extid=f09a12b2c77bfbbf51bd
> userspace arch: arm
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+f09a12b2c77bfbbf51bd@...kaller.appspotmail.com


+Mark, arm
It did not get far with CONFIG_CONTEXT_TRACKING_FORCE (kernel doesn't boot).


> Run /sbin/init as init process
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at include/linux/seqlock.h:271 __seqprop_assert include/linux/seqlock.h:271 [inline]
> WARNING: CPU: 0 PID: 1 at include/linux/seqlock.h:271 __seqprop_assert.constprop.0+0xf0/0x11c include/linux/seqlock.h:269
> Modules linked in:
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 0 PID: 1 Comm: init Not tainted 5.12.0-rc3-syzkaller #0
> Hardware name: ARM-Versatile Express
> Backtrace:
> [<81804310>] (dump_backtrace) from [<81804584>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252)
>  r7:00000080 r6:60000193 r5:00000000 r4:82b58444
> [<8180456c>] (show_stack) from [<8180bc58>] (__dump_stack lib/dump_stack.c:79 [inline])
> [<8180456c>] (show_stack) from [<8180bc58>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120)
> [<8180bba0>] (dump_stack) from [<81805118>] (panic+0x130/0x378 kernel/panic.c:231)
>  r7:81f487d4 r6:82a390e4 r5:00000000 r4:82c6b0d8
> [<81804fe8>] (panic) from [<802447b4>] (__warn+0xb0/0x164 kernel/panic.c:605)
>  r3:82a2248c r2:00000000 r1:5b71e000 r0:81f487d4
>  r7:0000010f
> [<80244704>] (__warn) from [<818053c8>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628)
>  r7:8028c4b4 r6:0000010f r5:81f40c30 r4:00000000
> [<81805364>] (warn_slowpath_fmt) from [<8028c4b4>] (__seqprop_assert include/linux/seqlock.h:271 [inline])
> [<81805364>] (warn_slowpath_fmt) from [<8028c4b4>] (__seqprop_assert.constprop.0+0xf0/0x11c include/linux/seqlock.h:269)
>  r8:00000000 r7:82a22498 r6:828ac940 r5:8181fbb0 r4:00000001
> [<8028c3c4>] (__seqprop_assert.constprop.0) from [<8028ea54>] (vtime_user_enter+0x1c/0x90 kernel/sched/cputime.c:709)
>  r5:8181fbb0 r4:834f0000
> [<8028ea38>] (vtime_user_enter) from [<8181fbb0>] (__context_tracking_enter+0x148/0x334 kernel/context_tracking.c:82)
>  r7:82a22498 r6:828ac940 r5:ffffe000 r4:00000001
> [<8181fa68>] (__context_tracking_enter) from [<80417170>] (context_tracking_enter kernel/context_tracking.c:122 [inline])
> [<8181fa68>] (__context_tracking_enter) from [<80417170>] (context_tracking_enter+0x54/0x84 kernel/context_tracking.c:106)
>  r7:00000000 r6:00000000 r5:60000193 r4:00000001
> [<8041711c>] (context_tracking_enter) from [<804171bc>] (user_enter include/linux/context_tracking.h:28 [inline])
> [<8041711c>] (context_tracking_enter) from [<804171bc>] (context_tracking_user_enter+0x1c/0x20 kernel/context_tracking.c:130)
>  r5:81820218 r4:00000000
> [<804171a0>] (context_tracking_user_enter) from [<802000d4>] (no_work_pending+0x8/0x38)
> Exception stack(0x834dffb0 to 0x834dfff8)
> ffa0:                                     00000000 00000000 00000000 00000000
> ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> ffe0: 00000000 7ec68ef0 00000000 76ee5a00 00000010 00000000
> Rebooting in 86400 seconds..
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
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