syzbot


WARNING in do_symlinkat (3)

Status: upstream: reported on 2025/02/09 18:07
Reported-by: syzbot+4c727372540aa524310a@syzkaller.appspotmail.com
First crash: 30d, last: 30d
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in do_symlinkat 2 519d 550d 0/3 auto-obsoleted due to no activity on 2024/01/17 15:16
linux-5.15 WARNING in do_symlinkat (2) origin:lts-only syz inconclusive 4 479d 526d 0/3 auto-obsoleted due to no activity on 2024/10/05 04:07
linux-6.1 WARNING in do_symlinkat (2) 4 143d 250d 0/3 auto-obsoleted due to no activity on 2025/01/27 06:22
linux-5.15 WARNING in do_symlinkat 1 650d 650d 0/3 auto-obsoleted due to no activity on 2023/09/09 00:28
upstream WARNING in do_symlinkat ntfs3 C error done 66 646d 811d 22/28 fixed on 2023/06/08 14:41
upstream WARNING in do_symlinkat (2) ntfs3 C error unreliable 48 16h24m 570d 0/28 upstream: reported C repro on 2023/08/19 10:47

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff0000e2aa7930, owner = 0x0, curr 0xffff0000cfb2b780, list empty
WARNING: CPU: 0 PID: 4864 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 0 PID: 4864 at kernel/locking/rwsem.c:1372 up_write+0x5c4/0x76c kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 0 PID: 4864 Comm: syz.2.137 Not tainted 6.1.128-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1371 [inline]
pc : up_write+0x5c4/0x76c kernel/locking/rwsem.c:1626
lr : __up_write kernel/locking/rwsem.c:1371 [inline]
lr : up_write+0x5c4/0x76c kernel/locking/rwsem.c:1626
sp : ffff800021b17b80
x29: ffff800021b17c00 x28: 1ffff00004362f90 x27: 1fffe0001c554f33
x26: dfff800000000000 x25: 1fffe0001c554f27 x24: ffff0000e2aa7988
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000cfb2b780
x20: ffff0000e2aa7930 x19: ffff0000e2aa7930 x18: 1fffe0003679bf76
x17: ffff800015a8d000 x16: ffff80000830159c x15: ffff0001b3cdfbbc
x14: 1ffff00002b520b2 x13: dfff800000000000 x12: 0000000000000003
x11: 0000000000ff0100 x10: 0000000000000003 x9 : b8d58615ac3d4500
x8 : b8d58615ac3d4500 x7 : ffff800008277b18 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000007 x1 : ffff80001248c5a0 x0 : ffff80019e2fc000
Call trace:
 __up_write kernel/locking/rwsem.c:1371 [inline]
 up_write+0x5c4/0x76c kernel/locking/rwsem.c:1626
 inode_unlock include/linux/fs.h:763 [inline]
 done_path_create fs/namei.c:3927 [inline]
 do_symlinkat+0x20c/0x45c fs/namei.c:4503
 __do_sys_symlinkat fs/namei.c:4517 [inline]
 __se_sys_symlinkat fs/namei.c:4514 [inline]
 __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4514
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 356
hardirqs last  enabled at (355): [<ffff800008277bb8>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline]
hardirqs last  enabled at (355): [<ffff800008277bb8>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:5000
hardirqs last disabled at (356): [<ffff80001232d0c4>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (336): [<ffff8000081c2418>] softirq_handle_end kernel/softirq.c:421 [inline]
softirqs last  enabled at (336): [<ffff8000081c2418>] handle_softirqs+0xb84/0xd58 kernel/softirq.c:606
softirqs last disabled at (247): [<ffff800008020174>] __do_softirq+0x14/0x20 kernel/softirq.c:612
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/09 18:07 linux-6.1.y 0cbb5f65e52f ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in do_symlinkat
* Struck through repros no longer work on HEAD.