syzbot


WARNING in inode_set_cached_link

Status: upstream: reported C repro on 2025/02/06 17:01
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+2cca5ef7e5ed862c0799@syzkaller.appspotmail.com
First crash: 50d, last: 10m
Cause bisection: introduced by (bisect log) :
commit 6408a56623761f969537b421d99f045a4cc955b9
Author: Mateusz Guzik <mjguzik@gmail.com>
Date: Tue Feb 4 21:32:07 2025 +0000

  vfs: sanity check the length passed to inode_set_cached_link()

Crash: WARNING in inode_set_cached_link (log)
Repro: C syz .config
  
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly ext4 report (Mar 2025) 0 (1) 2025/03/24 18:56
[syzbot] [ext4?] WARNING in inode_set_cached_link 1 (3) 2025/02/08 18:23

Sample crash report:
------------[ cut here ]------------
bad length passed for symlink [/tmp/syz-imagegen2884317625/] (got 39, expected 29)
WARNING: CPU: 1 PID: 5831 at ./include/linux/fs.h:803 inode_set_cached_link+0xd0/0x110 include/linux/fs.h:802
Modules linked in:
CPU: 1 UID: 0 PID: 5831 Comm: syz-executor172 Not tainted 6.14.0-rc5-syzkaller-00218-g2a520073e74f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:inode_set_cached_link+0xd0/0x110 include/linux/fs.h:802
Code: 41 5f 5d e9 fd 25 91 fe e8 dd c3 42 ff c6 05 7e ee a7 0d 01 90 48 c7 c7 e0 eb 3d 8c 4c 89 f6 44 89 fa 89 e9 e8 71 80 02 ff 90 <0f> 0b 90 90 e9 6a ff ff ff 89 f9 80 e1 07 80 c1 03 38 c1 7c a1 e8
RSP: 0018:ffffc900030af698 EFLAGS: 00010246
RAX: 59c2b3f6420cfd00 RBX: ffff88807ac16fa8 RCX: ffff888049c53c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000000001d R08: ffffffff81819e32 R09: 1ffff110170e519a
R10: dffffc0000000000 R11: ffffed10170e519b R12: ffff88807ac16fa8
R13: dffffc0000000000 R14: ffff88807ac16cf8 R15: 0000000000000027
FS:  00005555603d7380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd88229fc8 CR3: 000000007a49a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __ext4_iget+0x2ea4/0x3f30 fs/ext4/inode.c:5012
 ext4_lookup+0x3e3/0x750 fs/ext4/namei.c:1813
 __lookup_slow+0x298/0x400 fs/namei.c:1793
 lookup_slow+0x53/0x70 fs/namei.c:1810
 walk_component+0x2e1/0x410 fs/namei.c:2114
 lookup_last fs/namei.c:2612 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2636
 filename_lookup+0x2a3/0x670 fs/namei.c:2665
 user_path_at+0x3a/0x60 fs/namei.c:3072
 ksys_umount fs/namespace.c:2071 [inline]
 __do_sys_umount fs/namespace.c:2079 [inline]
 __se_sys_umount fs/namespace.c:2077 [inline]
 __x64_sys_umount+0xf1/0x170 fs/namespace.c:2077
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9030e48507
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd8822a228 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9030e48507
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd8822a2e0
RBP: 00007ffd8822a2e0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffd8822b3d0
R13: 00005555603e8740 R14: 431bde82d7b634db R15: 00007ffd8822d550
 </TASK>

Crashes (74546):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/09 13:04 upstream 2a520073e74f 163f510d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-kasan-gce-root WARNING in inode_set_cached_link
2025/02/27 18:18 upstream dd83757f6e68 6a8fcbc4 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in inode_set_cached_link
2025/02/26 19:52 upstream ac9c34d1e45a d34966d1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs WARNING in inode_set_cached_link
2025/02/16 13:49 upstream ad1b832bf1cf 40a34ec9 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs WARNING in inode_set_cached_link
2025/02/12 16:22 upstream 09fbf3d50205 b27c2402 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in inode_set_cached_link
2025/02/09 05:03 upstream 9946eaf552b1 ef44b750 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-upstream-fs WARNING in inode_set_cached_link
2025/02/08 20:56 upstream 8f6629c004b1 ef44b750 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs WARNING in inode_set_cached_link
2025/02/06 12:54 linux-next 808eb958781e 577d049b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root WARNING in inode_set_cached_link
2025/03/25 04:32 upstream 38fec10eb60d 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in inode_set_cached_link
2025/03/25 03:10 upstream 38fec10eb60d 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in inode_set_cached_link
2025/03/25 02:58 upstream 38fec10eb60d 875573af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in inode_set_cached_link
2025/02/10 03:36 linux-next ed58d103e6da ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in inode_set_cached_link
2025/03/28 13:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 49900278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 13:20 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 49900278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 13:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 49900278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 12:41 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 49900278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 11:54 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 49900278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 10:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 10:41 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 09:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 08:59 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 07:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 07:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 06:57 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 05:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 04:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 04:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 03:36 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 03:17 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 02:14 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 01:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/28 00:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 23:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 21:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 20:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 20:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 19:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 19:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 17:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 17:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 16:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 15:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 14:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 14:17 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 14:09 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 14:01 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 13:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 12:20 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 11:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 09:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 08:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 07:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 06:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
2025/03/27 05:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a2392f333575 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in inode_set_cached_link
* Struck through repros no longer work on HEAD.