syzbot


WARNING in io_uring_flush

Status: fixed on 2021/03/10 01:49
Subsystems: fs io-uring
[Documentation on labels]
Reported-by: syzbot+a32b546d58dde07875a1@syzkaller.appspotmail.com
Fix commit: 4325cb498cb7 io_uring: fix uring_flush in exit_files() warning
First crash: 1247d, last: 1238d
Cause bisection: introduced by (bisect log) [merge commit]:
commit 787fec8ac15cc693b9a7bc1b4a338b92483d993c
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri Dec 18 01:46:34 2020 +0000

  Merge tag 'for-linus-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs

Crash: INFO: task hung in io_sq_thread_stop (log)
Repro: C syz .config
  
Discussions (3)
Title Replies (including bot) Last reply
Re: [PATCH 2/2] io_uring: fix uring_flush in exit_files() warning 1 (1) 2021/01/17 02:40
WARNING in io_uring_flush 2 (5) 2021/01/16 20:02
[PATCH 0/2] syzbot warning reports 4 (4) 2021/01/16 19:01
Last patch testing requests (1)
Created Duration User Patch Repo Result
2021/01/16 19:06 17m axboe@kernel.dk git://git.kernel.dk/linux-block io_uring-5.11 OK

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8613 at fs/io_uring.c:9096 io_uring_flush+0x326/0x3a0 fs/io_uring.c:9096
Modules linked in:
CPU: 1 PID: 8613 Comm: syz-executor948 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_uring_flush+0x326/0x3a0 fs/io_uring.c:9096
Code: e9 58 fe ff ff e8 aa e3 9a ff 49 c7 84 24 a0 00 00 00 00 00 00 00 e9 aa fe ff ff e8 74 9e dd ff e9 91 fd ff ff e8 8a e3 9a ff <0f> 0b e9 51 ff ff ff e8 6e 9e dd ff e9 06 fd ff ff 4c 89 f7 e8 61
RSP: 0018:ffffc90001a4faa0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801113b780 RSI: ffffffff81d7e636 RDI: 0000000000000003
RBP: ffff88801c862280 R08: 0000000000000000 R09: 00000000196e5401
R10: ffffffff81d7e585 R11: 0000000000000000 R12: ffff888019724000
R13: ffff8880196e5401 R14: ffff888019724040 R15: ffff8880197240d0
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000025f8e000 CR4: 0000000000350ef0
Call Trace:
 filp_close+0xb4/0x170 fs/open.c:1280
 close_files fs/file.c:401 [inline]
 put_files_struct fs/file.c:416 [inline]
 put_files_struct+0x1cc/0x350 fs/file.c:413
 exit_files+0x7e/0xa0 fs/file.c:433
 do_exit+0xc22/0x2ae0 kernel/exit.c:820
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x3e9/0x20a0 kernel/signal.c:2770
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446b69
Code: Unable to access opcode bytes at RIP 0x446b3f.
RSP: 002b:00007fbb80bcecf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dbc28 RCX: 0000000000446b69
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007ffc1b88469f R14: 00007fbb80bcf9c0 R15: 00000000006dbc2c

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/01/16 14:02 upstream 1d94330a437a 65a7a854 .config console log report syz C ci-upstream-kasan-gce-root
2021/01/25 01:33 upstream e68061375f79 52e37319 .config console log report info ci-upstream-kasan-gce-root WARNING in io_uring_flush
2021/01/24 10:18 upstream e1ae4b0be158 52e37319 .config console log report info ci-upstream-kasan-gce-smack-root WARNING in io_uring_flush
2021/01/22 01:28 upstream 9791581c049c d4f4eca5 .config console log report info ci-upstream-kasan-gce-smack-root WARNING in io_uring_flush
2021/01/20 18:35 upstream 45dfb8a5659a d4f4eca5 .config console log report info ci-upstream-kasan-gce-root WARNING in io_uring_flush
2021/01/19 14:45 upstream 1e2a199f6ccd 63631df1 .config console log report info ci-upstream-kasan-gce-smack-root WARNING in io_uring_flush
2021/01/17 22:30 upstream a1339d6355ac 813be542 .config console log report info ci-upstream-kasan-gce-root WARNING in io_uring_flush
2021/01/17 01:16 upstream 1d94330a437a 65a7a854 .config console log report info ci-upstream-kasan-gce-smack-root
2021/01/16 13:38 upstream 1d94330a437a 65a7a854 .config console log report info ci-upstream-kasan-gce-root
2021/01/15 15:45 upstream 146620506274 65a7a854 .config console log report info ci-upstream-kasan-gce-selinux-root
* Struck through repros no longer work on HEAD.