WARNING in f2fs_delete_entry

Status: auto-obsoleted due to no activity on 2025/09/18 06:39
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+42665772e58deba33ed6@syzkaller.appspotmail.com
First crash: 638d, last: 438d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/07/12 upstream (ToT) 3f31a806a62e C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in f2fs_delete_entry origin:upstream missing-backport -1 syz, C error 8 432d 638d 0/3 upstream: reported C repro on 2024/11/21 21:29
upstream WARNING in f2fs_delete_entry f2fs -1 syz, C 71 502d 637d 0/29 closed as dup on 2024/11/25 18:18
upstream WARNING in f2fs_delete_entry (2) f2fs -1 syz, C 4 315d 326d 29/29 fixed on 2026/01/07 12:29
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2025/07/12 19:48 1h39m retest repro linux-5.15.y no crash log
2025/07/06 05:38 18m retest repro linux-5.15.y no crash log
2025/05/25 02:42 11m retest repro linux-5.15.y report log
2025/04/26 01:59 13m retest repro linux-5.15.y report log
2025/03/29 13:07 14m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2025/05/29 02:47 10m fix candidate upstream error job log
2025/01/17 16:30 58m bisect fix linux-5.15.y error job log

Sample crash report:
F2FS-fs (loop6): invalid namelen(0), ino:8, run fsck to fix.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4241 at fs/inode.c:332 drop_nlink+0xe8/0x148 fs/inode.c:332
Modules linked in:
CPU: 0 PID: 4241 Comm: syz-executor Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : drop_nlink+0xe8/0x148 fs/inode.c:332
lr : drop_nlink+0xe8/0x148 fs/inode.c:332
sp : ffff80001f8879b0
x29: ffff80001f8879b0 x28: ffff0000e9441c80 x27: dfff800000000000
x26: 1fffff80006949a9 x25: dfff800000000000 x24: 1fffe0001d288390
x23: 1fffe0001d288399 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000e9441cc8 x19: ffff0000e9441c80 x18: 0000000000000000
x17: ffff800016cf0000 x16: ffff8000082bf3c8 x15: ffff8000167d04c0
x14: ffff0000cc854080 x13: ffff0000cc854148 x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : ffff80000894edfc
x8 : ffff0000cc853680 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000020 x4 : 0000000000000000 x3 : ffff800008044e7c
x2 : 0000000000000006 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 drop_nlink+0xe8/0x148 fs/inode.c:332
 f2fs_i_links_write fs/f2fs/f2fs.h:2884 [inline]
 f2fs_drop_nlink+0x108/0x300 fs/f2fs/dir.c:911
 f2fs_delete_entry+0x9dc/0xd5c fs/f2fs/dir.c:978
 f2fs_unlink+0x2a0/0x84c fs/f2fs/namei.c:567
 f2fs_rmdir+0x5c/0x7c fs/f2fs/namei.c:733
 vfs_rmdir+0x1c4/0x3ec fs/namei.c:4149
 do_rmdir+0x240/0x634 fs/namei.c:4210
 __do_sys_unlinkat fs/namei.c:4390 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 289292
hardirqs last  enabled at (289291): [<ffff800008387eb8>] seqcount_lockdep_reader_access+0x1fc/0x2c4 include/linux/seqlock.h:105
hardirqs last disabled at (289292): [<ffff8000111a5098>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (289050): [<ffff800008031d3c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (289048): [<ffff800008031d08>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace 3028aba3368cda69 ]---

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/10 06:38 linux-5.15.y 1c700860e8bc 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2025/06/05 18:34 linux-5.15.y 1c700860e8bc 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2025/05/05 06:18 linux-5.15.y 16fdf2c7111b b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2025/05/05 06:17 linux-5.15.y 16fdf2c7111b b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2025/04/30 08:32 linux-5.15.y f7347f400572 85a5a23f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2025/04/30 07:40 linux-5.15.y f7347f400572 85a5a23f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2025/02/24 22:16 linux-5.15.y c16c81c81336 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2025/02/18 05:39 linux-5.15.y c16c81c81336 429ea007 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2024/11/21 21:58 linux-5.15.y 0a51d2d4527b 4b25d554 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2024/11/21 21:44 linux-5.15.y 0a51d2d4527b 4b25d554 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
2024/11/21 21:29 linux-5.15.y 0a51d2d4527b 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in f2fs_delete_entry
* Struck through repros no longer work on HEAD.