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WARNING in inc_nlink (2)

Status: upstream: reported C repro on 2020/11/06 09:55
Reported-by: syzbot+7ea4ab8fb125ccf3dacf@syzkaller.appspotmail.com
First crash: 864d, last: 28d
similar bugs (7):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 WARNING in inc_nlink (2) C error 102 113d 868d 0/1 upstream: reported C repro on 2020/11/01 15:25
linux-5.15 WARNING in inc_nlink C 2 8h08m 8h32m 0/3 upstream: reported C repro on 2023/03/20 05:26
upstream WARNING in inc_nlink (2) fuse C inconclusive done 21 377d 714d 22/24 fixed on 2022/03/08 16:11
upstream WARNING in inc_nlink (3) 9p C error error 247 33d 367d 0/24 upstream: reported C repro on 2022/03/17 16:37
linux-4.19 WARNING in inc_nlink C done 8 943d 1092d 1/1 fixed on 2020/09/18 07:23
linux-4.14 WARNING in inc_nlink C done 21 950d 1093d 1/1 fixed on 2020/09/11 09:49
upstream WARNING in inc_nlink C done 26 980d 1083d 17/24 fixed on 2020/09/16 22:51

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7960 at fs/inode.c:342 inc_nlink+0x113/0x130 fs/inode.c:342
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7960 Comm: syz-executor341 Not tainted 4.14.267-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 report_bug+0x208/0x250 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:inc_nlink+0x113/0x130 fs/inode.c:342
RSP: 0018:ffff88809093fc80 EFLAGS: 00010297
RAX: ffff88809f5fc080 RBX: ffff888095d6f0c0 RCX: 0000000000004763
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888095d6f198
RBP: 0000000000000000 R08: ffffffff8b9c65d8 R09: 000000000004057b
R10: ffff88809f5fc980 R11: ffff88809f5fc080 R12: ffff888095d6f108
R13: 0000000000000000 R14: ffff8880b455a900 R15: 0000000000000005
 fuse_link+0x32c/0x4b0 fs/fuse/dir.c:860
 vfs_link+0x6d5/0xb40 fs/namei.c:4264
 SYSC_linkat fs/namei.c:4332 [inline]
 SyS_linkat+0x3e5/0x6a0 fs/namei.c:4288
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f339b35bd29
RSP: 002b:00007f339b2ec2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f339b3ee4d0 RCX: 00007f339b35bd29
RDX: 00007f339b35bd29 RSI: 0000000020000080 RDI: 0000000020000040
RBP: 00007f339b3bc0ec R08: 0000000000003065 R09: 0000000000000000
R10: 0000000000000030 R11: 0000000000000246 R12: 00007f339b3b60d8
R13: 00007f339b3b80e0 R14: 00007f339b3ba0e8 R15: 00007f339b3ee4d8
Kernel Offset: disabled
Rebooting in 86400 seconds..

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci2-linux-4-14 2023/02/19 15:03 linux-4.14.y a8ad60f2af58 3cd800e4 .config console log report syz C
ci2-linux-4-14 2023/01/20 05:00 linux-4.14.y 97205fccccdc 3cd800e4 .config console log report syz C
ci2-linux-4-14 2022/10/27 13:28 linux-4.14.y 41f36d7859a7 3cd800e4 .config console log report syz C
ci2-linux-4-14 2022/09/19 11:28 linux-4.14.y 5df8b4735177 3cd800e4 .config console log report syz C
ci2-linux-4-14 2022/08/20 10:18 linux-4.14.y b641242202ed 3cd800e4 .config console log report syz C
ci2-linux-4-14 2022/07/21 09:56 linux-4.14.y 424a46ea058e 3cd800e4 .config console log report syz C
ci2-linux-4-14 2022/06/21 09:26 linux-4.14.y 84bae26850e3 3cd800e4 .config console log report syz C
ci2-linux-4-14 2022/05/22 08:54 linux-4.14.y dffb5c6ff09c 3cd800e4 .config console log report syz C
ci2-linux-4-14 2022/04/22 04:19 linux-4.14.y 15a1c6b6f516 3cd800e4 .config console log report syz C
ci2-linux-4-14 2022/03/23 03:57 linux-4.14.y eb045674aab3 3cd800e4 .config console log report syz C
ci2-linux-4-14 2021/12/15 18:43 linux-4.14.y 9dfbac0e6b86 1bf9a662 .config console log report syz C
ci2-linux-4-14 2021/11/15 18:21 linux-4.14.y 5f9f3b0057d5 1bf9a662 .config console log report syz C
ci2-linux-4-14 2021/10/16 17:02 linux-4.14.y ed99bf0e81b5 1bf9a662 .config console log report syz C
ci2-linux-4-14 2021/09/16 15:40 linux-4.14.y f96eb53cbd76 1bf9a662 .config console log report syz C
ci2-linux-4-14 2021/08/17 15:03 linux-4.14.y 162b95d01320 1bf9a662 .config console log report syz C
ci2-linux-4-14 2021/07/18 14:34 linux-4.14.y 4e68c9b0763f 1bf9a662 .config console log report syz C
ci2-linux-4-14 2021/06/18 14:09 linux-4.14.y cfb41ef9deb1 1bf9a662 .config console log report syz C
ci2-linux-4-14 2021/01/15 11:38 linux-4.14.y f79dc86058bc 1bf9a662 .config console log report syz C
ci2-linux-4-14 2020/12/14 08:50 linux-4.14.y 3f2ecb86cb90 1bf9a662 .config console log report syz C
* Struck through repros no longer work on HEAD.
Crashes (47):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci2-linux-4-14 2022/02/20 12:04 linux-4.14.y a35d65bedfbc 3cd800e4 .config console log report syz C WARNING in inc_nlink
ci2-linux-4-14 2022/02/20 11:29 linux-4.14.y a35d65bedfbc 3cd800e4 .config console log report syz C WARNING in inc_nlink
ci2-linux-4-14 2021/12/27 11:21 linux-4.14.y 8ee0807eedf3 e4f103c4 .config console log report syz C WARNING in inc_nlink
ci2-linux-4-14 2020/11/14 08:27 linux-4.14.y 27ce4f2a6817 1bf9a662 .config console log report syz C
ci2-linux-4-14 2020/11/12 05:23 linux-4.14.y 27ce4f2a6817 cca87986 .config console log report syz C
ci2-linux-4-14 2020/11/06 10:08 linux-4.14.y 6b6446efedb2 cba33199 .config console log report syz C
ci2-linux-4-14 2022/02/13 14:12 linux-4.14.y 8034e99d1a01 8b9ca619 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2022/01/16 00:15 linux-4.14.y 4ba8e26127c3 723cfaf0 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2022/01/14 04:48 linux-4.14.y 4ba8e26127c3 b8d780ab .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2022/01/10 12:49 linux-4.14.y bfdef05c8da4 2ca0d385 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/05/19 13:40 linux-4.14.y 7d7d1c0ab3eb a343ba6b .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/05/19 07:51 linux-4.14.y 7d7d1c0ab3eb a343ba6b .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/05/18 16:03 linux-4.14.y 7d7d1c0ab3eb a343ba6b .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/05/08 23:09 linux-4.14.y 7d7d1c0ab3eb bc5434be .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/05/03 07:03 linux-4.14.y 7d7d1c0ab3eb 77e2b668 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/04/30 00:50 linux-4.14.y 7d7d1c0ab3eb 77e2b668 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/04/29 00:03 linux-4.14.y 7d7d1c0ab3eb 77e2b668 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/04/24 09:41 linux-4.14.y cf256fbcbe34 17f0b706 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/04/23 22:33 linux-4.14.y cf256fbcbe34 17f0b706 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/04/23 19:37 linux-4.14.y cf256fbcbe34 17f0b706 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/04/22 03:46 linux-4.14.y cf256fbcbe34 2bc8999a .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/04/19 14:20 linux-4.14.y cf256fbcbe34 50f523d7 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/04/17 01:41 linux-4.14.y cf256fbcbe34 7e2b734b .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/03/28 20:15 linux-4.14.y 670d6552eda8 a8529b82 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/03/23 21:42 linux-4.14.y cb83ddcd5332 e613994b .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/03/14 00:01 linux-4.14.y c7150cd2fa8c 4a003785 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/03/12 01:34 linux-4.14.y c7150cd2fa8c 429d8a6b .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/03/02 18:45 linux-4.14.y 3242aa3a635c 92ead296 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/03/01 18:00 linux-4.14.y 3242aa3a635c 4c37c133 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/02/27 03:53 linux-4.14.y 3242aa3a635c 4c37c133 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/02/25 23:47 linux-4.14.y 3242aa3a635c 76f7fc95 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/02/11 17:01 linux-4.14.y 2c8a3fceddf0 a52ee10a .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/02/07 09:10 linux-4.14.y 2c8a3fceddf0 2ce644fc .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/02/07 06:56 linux-4.14.y 2c8a3fceddf0 0655e081 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/02/04 23:09 linux-4.14.y 2c8a3fceddf0 42b90a7c .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/02/02 00:04 linux-4.14.y 2c8a3fceddf0 e6b95f32 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/02/01 12:17 linux-4.14.y 2c8a3fceddf0 fc9fd31e .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/01/26 13:13 linux-4.14.y 2d2791fce891 52e37319 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/01/24 22:25 linux-4.14.y 2d2791fce891 52e37319 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/01/24 05:55 linux-4.14.y 2d2791fce891 52e37319 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/01/23 00:00 linux-4.14.y 2762b48e9611 52e37319 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/01/21 22:22 linux-4.14.y 2762b48e9611 d4f4eca5 .config console log report info WARNING in inc_nlink
ci2-linux-4-14 2021/01/17 04:38 linux-4.14.y f79dc86058bc 65a7a854 .config console log report info
ci2-linux-4-14 2020/12/16 11:15 linux-4.14.y 3f2ecb86cb90 649595c6 .config console log report info
ci2-linux-4-14 2020/11/12 17:59 linux-4.14.y 27ce4f2a6817 77a55c8e .config console log report info
ci2-linux-4-14 2020/11/07 07:34 linux-4.14.y 6b6446efedb2 cba33199 .config console log report info
ci2-linux-4-14 2020/11/06 09:54 linux-4.14.y 6b6446efedb2 cba33199 .config console log report info
* Struck through repros no longer work on HEAD.