syzbot


WARNING in drop_nlink

Status: upstream: reported C repro on 2023/06/08 18:04
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+dfeb6a89bfe7b591c73a@syzkaller.appspotmail.com
First crash: 918d, last: 395d
Fix bisection: failed (error log, bisect log)
  
Bug presence (1)
Date Name Commit Repro Result
2023/06/08 upstream (ToT) 25041a4c02c7 C [report] WARNING in drop_nlink
Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in drop_nlink (2) udf -1 C done inconclusive 3714 389d 1886d 0/29 closed as invalid on 2024/11/20 15:35
linux-6.1 WARNING in drop_nlink origin:upstream -1 C error 182 250d 914d 0/3 upstream: reported C repro on 2023/06/12 09:27
linux-4.14 WARNING in drop_nlink -1 C 9 1012d 1353d 0/1 upstream: reported C repro on 2022/03/30 09:01
linux-4.19 WARNING in drop_nlink fat reiserfs -1 C error 25 1041d 1891d 0/1 upstream: reported C repro on 2020/10/08 09:54
upstream WARNING in drop_nlink fs -1 C done error 1 2060d 2056d 15/29 fixed on 2020/09/16 22:51
Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/11/16 13:50 9m retest repro linux-5.15.y report log
2025/11/16 13:50 23m retest repro linux-5.15.y OK log
2025/11/16 13:50 10m retest repro linux-5.15.y report log
2025/10/09 01:51 21m retest repro linux-5.15.y report log
2025/09/07 07:00 9m retest repro linux-5.15.y report log
2025/09/07 07:00 12m retest repro linux-5.15.y report log
2025/09/07 07:00 10m retest repro linux-5.15.y report log
2025/07/28 17:00 11m retest repro linux-5.15.y report log
2025/06/27 13:04 11m retest repro linux-5.15.y report log
2025/06/27 13:04 12m retest repro linux-5.15.y report log
Fix bisection attempts (7)
Created Duration User Patch Repo Result
2024/12/26 09:44 56m bisect fix linux-5.15.y error job log
2024/03/17 15:39 1h04m bisect fix linux-5.15.y OK (0) job log log
2024/02/14 16:18 2h24m bisect fix linux-5.15.y OK (0) job log log
2024/01/06 06:47 52m bisect fix linux-5.15.y OK (0) job log log
2023/12/07 05:27 1h13m bisect fix linux-5.15.y OK (0) job log log
2023/11/06 23:20 1h50m bisect fix linux-5.15.y OK (0) job log log
2023/10/04 23:52 1h39m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
loop0: detected capacity change from 0 to 1024
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3517 at fs/inode.c:307 drop_nlink+0xbb/0x100
Modules linked in:
CPU: 1 PID: 3517 Comm: syz-executor425 Not tainted 5.15.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
RIP: 0010:drop_nlink+0xbb/0x100 fs/inode.c:307
Code: 49 8b 1e 48 8d bb c8 07 00 00 be 08 00 00 00 e8 2b b6 ed ff f0 48 ff 83 c8 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 a5 3b a4 ff <0f> 0b eb 89 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 62 ff ff ff 4c
RSP: 0018:ffffc9000216f950 EFLAGS: 00010293
RAX: ffffffff81dbc65b RBX: 1ffff11002bb4ce7 RCX: ffff888022a9bb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81dbc5df R09: fffff5200042de8d
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888015da6738
R13: ffff88807549fc40 R14: ffff888015da66f0 R15: dffffc0000000000
FS:  00007f86dad7f6c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86dae16598 CR3: 000000001f411000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfsplus_unlink+0x3fa/0x7f0 fs/hfsplus/dir.c:381
 hfsplus_rename+0xc4/0x1b0 fs/hfsplus/dir.c:547
 vfs_rename+0xbfc/0xf90 fs/namei.c:4742
 do_renameat2+0xb97/0x13b0 fs/namei.c:4892
 __do_sys_rename fs/namei.c:4938 [inline]
 __se_sys_rename fs/namei.c:4936 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:4936
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f86dadc2a99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f86dad7f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 000000000000003e RCX: 00007f86dadc2a99
RDX: ffffffffffffffb0 RSI: 0000000020000100 RDI: 00000000200000c0
RBP: 00007f86dae4b6a8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f86dae4b6a0
R13: 0000000020000cc0 R14: 0031656c69662f2e R15: 0073756c70736668
 </TASK>

Crashes (212):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/07 04:57 linux-5.15.y 38d4ca22a528 4ffcc9ef .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in drop_nlink
2023/06/08 18:04 linux-5.15.y d7af3e5ba454 058b3a5a .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/03/31 10:56 linux-5.15.y 9465fef4ae35 6baf5069 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/10/28 12:02 linux-5.15.y 74cdd62cb470 65e8686b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/20 19:09 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/17 03:18 linux-5.15.y 3a5928702e71 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/17 03:17 linux-5.15.y 3a5928702e71 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/16 03:27 linux-5.15.y 3a5928702e71 bde2d81c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/15 15:10 linux-5.15.y 3a5928702e71 7eb57b4a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/15 02:28 linux-5.15.y 3a5928702e71 b01b6661 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/14 13:35 linux-5.15.y 3a5928702e71 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/12 03:03 linux-5.15.y 3a5928702e71 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/11 10:41 linux-5.15.y 3a5928702e71 cd942402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/11 10:41 linux-5.15.y 3a5928702e71 cd942402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/10 20:57 linux-5.15.y 3a5928702e71 8fbfc0c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/10 07:51 linux-5.15.y 3a5928702e71 0278d004 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/09 23:08 linux-5.15.y 3a5928702e71 56fb2cb7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/09 22:03 linux-5.15.y 3a5928702e71 56fb2cb7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/08 13:55 linux-5.15.y 3a5928702e71 402f1df0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/08 13:13 linux-5.15.y 3a5928702e71 402f1df0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/08 09:59 linux-5.15.y 3a5928702e71 402f1df0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/08 03:25 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/06 23:55 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/06 22:39 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/06 09:47 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/05 00:57 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/04 22:31 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/03 20:21 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/03 07:57 linux-5.15.y 3a5928702e71 a4c7fd36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/03 07:57 linux-5.15.y 3a5928702e71 a4c7fd36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/02 16:43 linux-5.15.y 3a5928702e71 02f9582a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/01 16:51 linux-5.15.y 3a5928702e71 ea2b66a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/30 17:51 linux-5.15.y 3a5928702e71 bbd4e0a4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/28 14:54 linux-5.15.y 3a5928702e71 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/28 14:52 linux-5.15.y 3a5928702e71 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/28 05:41 linux-5.15.y 3a5928702e71 440b26ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/26 06:46 linux-5.15.y 3a5928702e71 0d19f247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/24 09:20 linux-5.15.y 3a5928702e71 89298aad .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/16 00:35 linux-5.15.y 3a5928702e71 08d8a733 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/15 07:21 linux-5.15.y 3a5928702e71 08d8a733 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/09/07 18:09 linux-5.15.y 14e468424d3e 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in drop_nlink
2024/10/29 02:56 linux-5.15.y 74cdd62cb470 9efb3cc7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/10/20 02:45 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/10/08 21:05 linux-5.15.y 3a5928702e71 402f1df0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/10/07 08:52 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/09/30 01:43 linux-5.15.y 3a5928702e71 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/09/29 14:16 linux-5.15.y 3a5928702e71 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/09/27 10:57 linux-5.15.y 3a5928702e71 9314348a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/09/22 20:53 linux-5.15.y 3a5928702e71 6f888b75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/09/15 13:29 linux-5.15.y 3a5928702e71 08d8a733 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
2024/09/09 09:43 linux-5.15.y 14e468424d3e 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in drop_nlink
* Struck through repros no longer work on HEAD.