WARNING in do_mknodat

Status: auto-obsoleted due to no activity on 2024/02/10 13:02
Reported-by: syzbot+94c2ecf49cd6ef99867d@syzkaller.appspotmail.com
First crash: 1015d, last: 1015d
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in do_mknodat fs -1 1 1329d 1274d 0/29 closed as invalid on 2023/02/16 16:02
upstream WARNING in do_mknodat (3) prio:high gfs2 -1 syz, C 240 186d 363d 0/29 upstream: reported C repro on 2025/08/15 07:21
upstream WARNING in do_mknodat (2) fs -1 11 999d 1267d 0/29 auto-obsoleted due to no activity on 2024/02/16 05:28
linux-5.15 WARNING in do_mknodat (4) origin:upstream -1 syz, C inconclusive 7 73d 457d 0/3 upstream: reported C repro on 2025/05/12 19:05
linux-6.1 WARNING in do_mknodat (2) -1 39 782d 849d 0/3 auto-obsoleted due to no activity on 2024/08/30 19:08
linux-5.15 WARNING in do_mknodat (3) -1 7 567d 664d 0/3 auto-obsoleted due to no activity on 2025/05/02 18:42
linux-6.1 WARNING in do_mknodat (4) -1 6 84d 322d 0/3 upstream: reported on 2025/09/25 13:41
linux-6.1 WARNING in do_mknodat (3) -1 27 466d 676d 0/3 auto-obsoleted due to no activity on 2025/08/12 05:18
linux-5.15 WARNING in do_mknodat (2) -1 4 803d 980d 0/3 auto-obsoleted due to no activity on 2024/09/08 20:03
linux-5.15 WARNING in do_mknodat -1 1 1092d 1092d 0/3 auto-obsoleted due to no activity on 2023/11/25 05:54

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff00011f3b91f0, owner = 0x0, curr 0xffff0000c6f28000, list empty
WARNING: CPU: 0 PID: 6028 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 0 PID: 6028 at kernel/locking/rwsem.c:1372 up_write+0x5c4/0x76c kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 0 PID: 6028 Comm: syz-executor.5 Not tainted 6.1.61-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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 : ffff80001f247b60
x29: ffff80001f247be0 x28: ffff000121c645e0 x27: 1fffe00023e7724b
x26: dfff800000000000 x25: 1fffe00023e7723f x24: ffff00011f3b9248
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000c6f28000
x20: ffff00011f3b91f0 x19: ffff00011f3b91f0 x18: 1fffe000368ac776
x17: ffff80001580d000 x16: ffff8000083062e0 x15: ffff0001b4563bbc
x14: 1ffff00002b020b0 x13: dfff800000000000 x12: 0000000000000003
x11: ff8080000aad6948 x10: 0000000000000003 x9 : 374c74a044cfe500
x8 : 374c74a044cfe500 x7 : ffff80000827db78 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000007 x1 : ffff80001228c340 x0 : ffff80019ee02000
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:761 [inline]
 done_path_create fs/namei.c:3858 [inline]
 do_mknodat+0x43c/0x530 fs/namei.c:3981
 __do_sys_mknodat fs/namei.c:3994 [inline]
 __se_sys_mknodat fs/namei.c:3991 [inline]
 __arm64_sys_mknodat+0xb0/0xcc fs/namei.c:3991
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 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: 1404
hardirqs last  enabled at (1403): [<ffff80000827dc18>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline]
hardirqs last  enabled at (1403): [<ffff80000827dc18>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:5000
hardirqs last disabled at (1404): [<ffff800012131e54>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (1396): [<ffff800008020d74>] softirq_handle_end kernel/softirq.c:414 [inline]
softirqs last  enabled at (1396): [<ffff800008020d74>] __do_softirq+0xc14/0xea0 kernel/softirq.c:600
softirqs last disabled at (1285): [<ffff80000802a99c>] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/02 13:01 linux-6.1.y 4a61839152cc 69904c9f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in do_mknodat
* Struck through repros no longer work on HEAD.