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From: syzbot <syzbot+ac957324022b7132accf@syzkaller.appspotmail.com>
To: asml.silence@gmail.com, axboe@kernel.dk,
	io-uring@vger.kernel.org, linux-kernel@vger.kernel.org,
	mingo@kernel.org, mingo@redhat.com, peterz@infradead.org,
	rostedt@goodmis.org, syzkaller-bugs@googlegroups.com,
	will@kernel.org
Subject: Re: [syzbot] INFO: task hung in io_sq_thread_park (2)
Date: Thu, 15 Jul 2021 17:14:07 -0700	[thread overview]
Message-ID: <000000000000494b5f05c73277cd@google.com> (raw)
In-Reply-To: <532f6c4a-1066-a31a-bd14-3f5068365f50@gmail.com>

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in io_uring_cancel_generic

------------[ cut here ]------------
WARNING: CPU: 1 PID: 25279 at fs/io_uring.c:9122 io_dump fs/io_uring.c:9117 [inline]
WARNING: CPU: 1 PID: 25279 at fs/io_uring.c:9122 io_uring_cancel_generic+0x5fb/0xe50 fs/io_uring.c:9195
Modules linked in:
CPU: 1 PID: 25279 Comm: iou-sqp-25271 Tainted: G        W         5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_dump fs/io_uring.c:9122 [inline]
RIP: 0010:io_uring_cancel_generic+0x5fb/0xe50 fs/io_uring.c:9195
Code: 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 9e 06 00 00 48 8b 85 10 08 00 00 48 89 44 24 40 <0f> 0b 48 8b 44 24 10 48 05 98 00 00 00 48 89 c2 48 89 44 24 08 48
RSP: 0018:ffffc9000ab87c50 EFLAGS: 00010246
RAX: ffff88803ddb7800 RBX: ffff888049f73880 RCX: 0000000000000000
RDX: 1ffff110093ee812 RSI: ffffffff81e2ebed RDI: ffff888049f74090
RBP: ffff888049f73880 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81e2ebc5 R11: 0000000000000001 R12: ffffc9000ab87d40
R13: ffff88803ddb7858 R14: 0000000000000001 R15: 0000000000000000
FS:  00007fb893f40700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68dd0c6080 CR3: 000000002b457000 CR4: 0000000000350ef0
Call Trace:
 io_sq_thread+0xaac/0x1250 fs/io_uring.c:6930
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 25279 Comm: iou-sqp-25271 Tainted: G        W         5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 panic+0x306/0x73d kernel/panic.c:232
 __warn.cold+0x35/0x44 kernel/panic.c:606
 report_bug+0x1bd/0x210 lib/bug.c:199
 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:239
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:259
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:566
RIP: 0010:io_dump fs/io_uring.c:9122 [inline]
RIP: 0010:io_uring_cancel_generic+0x5fb/0xe50 fs/io_uring.c:9195
Code: 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 9e 06 00 00 48 8b 85 10 08 00 00 48 89 44 24 40 <0f> 0b 48 8b 44 24 10 48 05 98 00 00 00 48 89 c2 48 89 44 24 08 48
RSP: 0018:ffffc9000ab87c50 EFLAGS: 00010246
RAX: ffff88803ddb7800 RBX: ffff888049f73880 RCX: 0000000000000000
RDX: 1ffff110093ee812 RSI: ffffffff81e2ebed RDI: ffff888049f74090
RBP: ffff888049f73880 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81e2ebc5 R11: 0000000000000001 R12: ffffc9000ab87d40
R13: ffff88803ddb7858 R14: 0000000000000001 R15: 0000000000000000
 io_sq_thread+0xaac/0x1250 fs/io_uring.c:6930
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Kernel Offset: disabled
Rebooting in 86400 seconds..


Tested on:

commit:         d55b8f3c io_uring: add syz debug info
git tree:       https://github.com/isilence/linux.git syztest_sqpoll_hang
console output: https://syzkaller.appspot.com/x/log.txt?x=16f6cb80300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cfe2c0e42bc9993d
dashboard link: https://syzkaller.appspot.com/bug?extid=ac957324022b7132accf
compiler:       


  reply	other threads:[~2021-07-16  0:14 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15  3:19 [syzbot] INFO: task hung in io_sq_thread_park (2) syzbot
2021-07-15  8:44 ` Pavel Begunkov
2021-07-15  9:15   ` syzbot
2021-07-15 18:16     ` Pavel Begunkov
2021-07-16  0:14       ` syzbot [this message]
2021-07-16 10:38         ` Pavel Begunkov
2021-07-16 10:57           ` syzbot
2021-07-19 13:15             ` Pavel Begunkov
2021-07-19 13:46               ` syzbot
2021-07-19 16:57             ` Pavel Begunkov
2021-07-19 17:13               ` Jens Axboe
2021-07-19 17:28                 ` Pavel Begunkov
2021-07-19 18:38                   ` Jens Axboe
2021-07-19 17:15               ` syzbot

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