syzbot


WARNING in inc_nlink (2)

Status: upstream: reported C repro on 2023/12/28 21:17
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+9e9d439464190b89a70c@syzkaller.appspotmail.com
First crash: 563d, last: 19h42m
Fix commit to backport (bisect log) :
tree: upstream
commit fb6f20ecb121cef4d7946f834a6ee867c4e21b4a
Author: Jan Kara <jack@suse.cz>
Date: Thu Oct 17 10:28:23 2024 +0000

  reiserfs: The last commit

  
Fix bisection: failed (error log, bisect log)
  
Bug presence (3)
Date Name Commit Repro Result
2024/12/27 linux-6.1.y (ToT) 563edd786f0a C [report] WARNING in inc_nlink
2023/12/29 upstream (ToT) 8735c7c84d1b C [report] WARNING in inc_nlink
2024/12/27 upstream (ToT) d6ef8b40d075 C Didn't crash
Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in inc_nlink origin:lts-only -1 C 12 1d13h 23d 0/2 upstream: reported C repro on 2025/06/21 08:35
linux-4.19 WARNING in inc_nlink (2) -1 C error 102 960d 1716d 0/1 upstream: reported C repro on 2020/11/01 15:25
linux-5.15 WARNING in inc_nlink origin:lts-only -1 C done 656 12h03m 847d 0/3 upstream: reported C repro on 2023/03/20 05:26
upstream WARNING in inc_nlink (2) fs -1 C inconclusive done 21 1224d 1561d 20/29 fixed on 2022/03/08 16:11
upstream WARNING in inc_nlink (3) fs -1 C error error 6843 3d10h 1215d 0/29 upstream: reported C repro on 2022/03/17 16:37
linux-6.1 WARNING in inc_nlink -1 81 804d 826d 0/3 auto-obsoleted due to no activity on 2023/07/31 15:23
linux-4.19 WARNING in inc_nlink -1 C done 8 1790d 1939d 1/1 fixed on 2020/09/18 07:23
linux-4.14 WARNING in inc_nlink -1 C done 21 1798d 1940d 1/1 fixed on 2020/09/11 09:49
linux-4.14 WARNING in inc_nlink (2) -1 C 47 876d 1711d 0/1 upstream: reported C repro on 2020/11/06 09:55
upstream WARNING in inc_nlink -1 C done 26 1828d 1931d 15/29 fixed on 2020/09/16 22:51
Fix bisection attempts (5)
Created Duration User Patch Repo Result
2025/01/31 12:21 3h48m fix candidate upstream OK (1) job log
2024/08/14 23:18 2m bisect fix linux-6.1.y error job log
2024/07/05 01:13 1h28m bisect fix linux-6.1.y OK (0) job log log
2024/03/20 09:43 1h03m bisect fix linux-6.1.y OK (0) job log log
2024/02/01 03:08 1h06m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
VFS: Found a Xenix FS (block size = 1024) on device loop0
syz-executor147: attempt to access beyond end of device
loop0: rw=0, sector=6491536, nr_sectors = 2 limit=128
Buffer I/O error on dev loop0, logical block 3245768, async page read
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4244 at fs/inode.c:389 inc_nlink+0x120/0x130
Modules linked in:
CPU: 1 PID: 4244 Comm: syz-executor147 Not tainted 6.1.114-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:inc_nlink+0x120/0x130 fs/inode.c:389
Code: ea ff e9 37 ff ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 49 ff ff ff 4c 89 ef e8 6a 04 ea ff e9 3c ff ff ff e8 c0 82 92 ff <0f> 0b eb 80 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 57 41 56 53 48
RSP: 0018:ffffc90003b5fd40 EFLAGS: 00010293
RAX: ffffffff81f810a0 RBX: 1ffff1100dc03810 RCX: ffff88802f8e5940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81f8101a R09: ffffed1002fc2b57
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88806e01c080 R14: ffff88806e01c038 R15: 0000000000000000
FS:  0000555587d8b380(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557c00f00368 CR3: 0000000073b61000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_inc_link_count include/linux/fs.h:2576 [inline]
 sysv_mkdir+0x1d/0x120 fs/sysv/namei.c:119
 vfs_mkdir+0x3b6/0x590 fs/namei.c:4106
 do_mkdirat+0x225/0x360 fs/namei.c:4131
 __do_sys_mkdir fs/namei.c:4151 [inline]
 __se_sys_mkdir fs/namei.c:4149 [inline]
 __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4149
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff05c3ba639
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe41316a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffe41316c08 RCX: 00007ff05c3ba639
RDX: 00007ff05c3b9930 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 00007ff05c437610 R08: 0000000000009e89 R09: 0000000000000000
R10: 00007ffe413168f0 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe41316bf8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Crashes (367):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/28 03:25 linux-6.1.y 7ec6f9fa3d97 65e8686b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan WARNING in inc_nlink
2023/12/29 06:44 linux-6.1.y 4aa6747d9352 fb427a07 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/05/18 04:57 linux-6.1.y 02b72ccb5f9d f41472b0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/02/05 07:57 linux-6.1.y 0cbb5f65e52f 5896748e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2024/04/14 09:36 linux-6.1.y cd5d98c0556c c8349e48 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/07 23:17 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/30 11:23 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/29 15:14 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/25 11:09 linux-6.1.y 58485ff1a74f 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/23 06:28 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/22 10:20 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/22 09:25 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/21 09:37 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/05 11:24 linux-6.1.y 58485ff1a74f 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/06/01 09:51 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/05/31 20:52 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/05/31 15:18 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/05/30 08:26 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/05/30 01:53 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/05/29 08:26 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/05/11 15:53 linux-6.1.y 02b72ccb5f9d 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/05/03 16:47 linux-6.1.y b6736e03756f b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2023/12/28 21:16 linux-6.1.y 4aa6747d9352 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in inc_nlink
2025/07/14 01:32 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/13 09:53 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/13 03:41 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/12 11:00 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/11 22:03 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/11 22:03 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/11 16:34 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/11 13:45 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/11 08:44 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/07/08 12:55 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/30 02:32 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/23 12:24 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/22 14:17 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/22 06:04 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/20 09:56 linux-6.1.y 58485ff1a74f ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/19 22:57 linux-6.1.y 58485ff1a74f ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/16 09:41 linux-6.1.y 58485ff1a74f 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/15 14:23 linux-6.1.y 58485ff1a74f 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/08 06:10 linux-6.1.y 58485ff1a74f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/08 04:33 linux-6.1.y 58485ff1a74f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/07 23:09 linux-6.1.y 58485ff1a74f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/04 02:15 linux-6.1.y da3c5173c55f a30356b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/06/02 05:32 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/05/30 06:17 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/05/21 11:03 linux-6.1.y 325285d9fc86 b47f9e02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/05/18 23:59 linux-6.1.y 325285d9fc86 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/05/18 20:11 linux-6.1.y 325285d9fc86 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/05/18 04:24 linux-6.1.y 02b72ccb5f9d f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/05/08 12:50 linux-6.1.y ac7079a42ea5 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
2025/05/07 11:37 linux-6.1.y ac7079a42ea5 350f4ffc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in inc_nlink
* Struck through repros no longer work on HEAD.