syzbot


kernel BUG in jfs_unlink

Status: upstream: reported on 2025/06/29 19:02
Reported-by: syzbot+68a4af373418d75ac55f@syzkaller.appspotmail.com
First crash: 10d, last: 10d
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in jfs_unlink jfs -1 C inconclusive 19 3h16m 351d 0/29 upstream: reported C repro on 2024/07/24 18:05

Sample crash report:
BUG at fs/jfs/namei.c:513 assert(ip->i_nlink)
------------[ cut here ]------------
kernel BUG at fs/jfs/namei.c:513!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4036 Comm: syz-executor Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : jfs_unlink+0x8c8/0x8f4 fs/jfs/namei.c:513
lr : jfs_unlink+0x8c8/0x8f4 fs/jfs/namei.c:513
sp : ffff80001f137a80
x29: ffff80001f137b70 x28: dfff800000000000 x27: ffff700003e26f58
x26: 0000000000000000 x25: 0000000000000001 x24: 0000000000000000
x23: 1ffff000028d83ac x22: ffff0000e98538e0 x21: ffff0000e9853bb0
x20: ffff0000e9855798 x19: ffff80001f137ac0 x18: 0000000000000002
x17: ffff800016cf2000 x16: ffff8000111b2714 x15: ffff8000167d2500
x14: ffff0000dd0d2540 x13: 1ffff0000282c06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : dc292c378cac2100
x8 : dc292c378cac2100 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff80000a7343e4
x2 : ffff0001a10e9d50 x1 : 0000000100000000 x0 : 000000000000002d
Call trace:
 jfs_unlink+0x8c8/0x8f4 fs/jfs/namei.c:513
 vfs_unlink+0x2e0/0x4f4 fs/namei.c:4280
 do_unlinkat+0x31c/0x600 fs/namei.c:4348
 __do_sys_unlinkat fs/namei.c:4391 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __arm64_sys_unlinkat+0xe0/0xfc 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
Code: 9003f6a3 91028063 52804022 95e5a93a (d4210000) 
---[ end trace afb5e9ebb8f432eb ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/29 19:01 linux-5.15.y 3dea0e7f549e fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 kernel BUG in jfs_unlink
* Struck through repros no longer work on HEAD.