From: Pavel Begunkov <asml.silence@gmail.com>
To: syzbot <syzbot+47fc00967b06a3019bd2@syzkaller.appspotmail.com>,
axboe@kernel.dk, io-uring@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: Re: [syzbot] INFO: task hung in __io_uring_cancel
Date: Fri, 7 May 2021 20:49:04 +0100 [thread overview]
Message-ID: <c2cab9a3-b821-e4fa-3a8a-c66f15a642c3@gmail.com> (raw)
In-Reply-To: <000000000000aca64205c05dcab3@google.com>
On 4/20/21 2:59 AM, syzbot wrote:
> Hello,
>
> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> KASAN: null-ptr-deref Write in io_uring_cancel_sqpoll
#syz test: git://git.kernel.dk/linux-block io_uring-5.13
>
> ==================================================================
> BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
> BUG: KASAN: null-ptr-deref in atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline]
> BUG: KASAN: null-ptr-deref in io_uring_cancel_sqpoll+0x150/0x310 fs/io_uring.c:8930
> Write of size 4 at addr 0000000000000114 by task iou-sqp-31588/31596
>
> CPU: 0 PID: 31596 Comm: iou-sqp-31588 Not tainted 5.12.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:79 [inline]
> dump_stack+0x141/0x1d7 lib/dump_stack.c:120
> __kasan_report mm/kasan/report.c:403 [inline]
> kasan_report.cold+0x5f/0xd8 mm/kasan/report.c:416
> check_region_inline mm/kasan/generic.c:180 [inline]
> kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186
> instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
> atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline]
> io_uring_cancel_sqpoll+0x150/0x310 fs/io_uring.c:8930
> io_sq_thread+0x47e/0x1310 fs/io_uring.c:6873
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
> ==================================================================
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 31596 Comm: iou-sqp-31588 Tainted: G B 5.12.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:79 [inline]
> dump_stack+0x141/0x1d7 lib/dump_stack.c:120
> panic+0x306/0x73d kernel/panic.c:231
> end_report mm/kasan/report.c:102 [inline]
> end_report.cold+0x5a/0x5a mm/kasan/report.c:88
> __kasan_report mm/kasan/report.c:406 [inline]
> kasan_report.cold+0x6a/0xd8 mm/kasan/report.c:416
> check_region_inline mm/kasan/generic.c:180 [inline]
> kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186
> instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
> atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline]
> io_uring_cancel_sqpoll+0x150/0x310 fs/io_uring.c:8930
> io_sq_thread+0x47e/0x1310 fs/io_uring.c:6873
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> Tested on:
>
> commit: 734551df io_uring: fix shared sqpoll cancellation hangs
> git tree: git://git.kernel.dk/linux-block for-5.13/io_uring
> console output: https://syzkaller.appspot.com/x/log.txt?x=175fec6dd00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=601d16d8cd22e315
> dashboard link: https://syzkaller.appspot.com/bug?extid=47fc00967b06a3019bd2
> compiler:
>
--
Pavel Begunkov
next prev parent reply other threads:[~2021-05-07 19:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-19 21:10 [syzbot] INFO: task hung in __io_uring_cancel syzbot
2021-04-19 22:24 ` Pavel Begunkov
2021-04-20 1:59 ` syzbot
2021-05-07 19:49 ` Pavel Begunkov [this message]
2021-05-08 2:35 ` syzbot
2021-05-08 14:17 ` Pavel Begunkov
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