From: syzbot <syzbot+47fc00967b06a3019bd2@syzkaller.appspotmail.com>
To: asml.silence@gmail.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: Mon, 19 Apr 2021 18:59:08 -0700 [thread overview]
Message-ID: <000000000000aca64205c05dcab3@google.com> (raw)
In-Reply-To: <02616552-d7c2-a3ea-a03d-a93d15023662@gmail.com>
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
==================================================================
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:
next prev parent reply other threads:[~2021-04-20 1:59 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 [this message]
2021-05-07 19:49 ` Pavel Begunkov
2021-05-08 2:35 ` syzbot
2021-05-08 14:17 ` Pavel Begunkov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=000000000000aca64205c05dcab3@google.com \
--to=syzbot+47fc00967b06a3019bd2@syzkaller.appspotmail.com \
--cc=asml.silence@gmail.com \
--cc=axboe@kernel.dk \
--cc=io-uring@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).