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WARNING in __percpu_ref_exit

Status: closed as dup on 2020/12/23 23:15
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+482debb49aa7d7fa0b09@syzkaller.appspotmail.com
First crash: 1238d, last: 1138d
▶ ▼ Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
WARNING in percpu_ref_kill_and_confirm (2) fs C done 71 1211d 1219d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
WARNING in __percpu_ref_exit 1 (2) 2020/12/23 23:12
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __percpu_ref_exit (2) fs C error done 31 892d 1131d 20/26 fixed on 2021/11/10 00:50

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8 at lib/percpu-refcount.c:113 __percpu_ref_exit+0x98/0x100 lib/percpu-refcount.c:113
Modules linked in:
CPU: 1 PID: 8 Comm: kworker/u17:0 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events_unbound io_ring_exit_work
RIP: 0010:__percpu_ref_exit+0x98/0x100 lib/percpu-refcount.c:113
Code: fd 49 8d 7c 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 61 49 83 7c 24 10 00 74 07 e8 98 e3 b0 fd <0f> 0b e8 91 e3 b0 fd 48 89 ef e8 09 29 e0 fd 48 89 da 48 b8 00 00
RSP: 0018:ffffc900003bfc98 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88800f1a2000 RCX: 0000000000000000
RDX: ffff88801121e200 RSI: ffffffff83c255a8 RDI: ffff88801b1c5310
RBP: 0000607f810b5218 R08: 0000000000000000 R09: ffffffff8fac59bf
R10: ffffffff83c25548 R11: 0000000000000009 R12: ffff88801b1c5300
R13: ffff888067d00000 R14: ffff88801b1c5300 R15: ffff8880111b0000
FS:  0000000000000000(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8875c02000 CR3: 000000001cc5a000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 percpu_ref_exit+0x3b/0x140 lib/percpu-refcount.c:134
 io_ring_ctx_free fs/io_uring.c:8445 [inline]
 io_ring_exit_work+0x2e9/0x4a0 fs/io_uring.c:8552
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/03/05 21:00 upstream 280d542f6ffa e4b4d570 .config console log report info ci-qemu-upstream WARNING in __percpu_ref_exit
2021/03/03 15:42 upstream f69d02e37a85 06ed56cd .config console log report info ci-qemu-upstream WARNING in __percpu_ref_exit
2021/03/03 04:49 upstream f69d02e37a85 e5b64d68 .config console log report info ci-qemu-upstream WARNING in __percpu_ref_exit
2021/03/01 21:02 upstream 7a7fd0de4a98 183afb6c .config console log report info ci-upstream-kasan-gce-root WARNING in __percpu_ref_exit
2021/02/24 06:06 upstream c03c21ba6f4e fcc6d71b .config console log report info ci-upstream-kasan-gce WARNING in __percpu_ref_exit
2021/03/07 21:20 upstream 280d542f6ffa 09fbf400 .config console log report info ci-qemu-upstream-386 WARNING in __percpu_ref_exit
2021/03/04 02:58 upstream f69d02e37a85 d7e4e604 .config console log report info ci-qemu2-arm64 WARNING in __percpu_ref_exit
2021/02/05 15:29 upstream dd86e7fa07a3 23a562df .config console log report info ci-upstream-kasan-gce-386 WARNING in __percpu_ref_exit
2021/01/24 20:39 upstream e68061375f79 52e37319 .config console log report info ci-upstream-kasan-gce-386 WARNING in __percpu_ref_exit
2021/01/23 23:14 upstream e1ae4b0be158 52e37319 .config console log report info ci-upstream-kasan-gce-386 WARNING in __percpu_ref_exit
2020/12/08 02:34 upstream cd796ed33450 51a9082e .config console log report info ci-upstream-kasan-gce-selinux-root
2020/12/06 20:41 upstream 7059c2c00a21 c521566d .config console log report info ci-upstream-kasan-gce-selinux-root
2020/12/28 16:02 linux-next d7a03a44a5e9 8259d56c .config console log report info ci-upstream-linux-next-kasan-gce-root
2020/12/01 13:51 linux-next 0eedceafd3a6 07bfe8a5 .config console log report info ci-upstream-linux-next-kasan-gce-root
2020/11/28 12:51 linux-next 6174f05255e6 76b4dcc7 .config console log report info ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.