syzbot


WARNING in unlock_mount

Status: auto-obsoleted due to no activity on 2023/12/02 19:20
Reported-by: syzbot+e254dfb157c4b0b2b6c7@syzkaller.appspotmail.com
First crash: 318d, last: 301d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in unlock_mount fs 5 1d15h 73d 0/27 moderation: reported on 2024/04/08 10:56
linux-5.15 WARNING in unlock_mount 2 300d 301d 0/3 auto-obsoleted due to no activity on 2023/12/03 05:00
linux-6.1 WARNING in unlock_mount (2) 5 17d 78d 0/3 upstream: reported on 2024/04/03 03:20

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff00011c341950, owner = 0x0, curr 0xffff000117f23780, list empty
WARNING: CPU: 0 PID: 9258 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 0 PID: 9258 at kernel/locking/rwsem.c:1372 up_write+0x5c4/0x76c kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 0 PID: 9258 Comm: syz-executor.2 Not tainted 6.1.47-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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 : ffff80002bb179e0
x29: ffff80002bb17a70 x28: 1ffff00005762f68 x27: 1fffe00023868337
x26: dfff800000000000 x25: 1fffe0002386832b x24: ffff00011c3419a8
x23: 0000000000000000 x22: 0000000000000000 x21: ffff000117f23780
x20: ffff00011c341950 x19: ffff00011c341950 x18: 1fffe000368a9f76
x17: ffff8000158ad000 x16: ffff800008304af8 x15: ffff0001b454fbbc
x14: 1ffff00002b160b0 x13: dfff800000000000 x12: 0000000000000003
x11: ff8080000aacf728 x10: 0000000000000003 x9 : ca8809ee4abef900
x8 : ca8809ee4abef900 x7 : ffff80000827c584 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff80002bb17540 x1 : ffff80001227c340 x0 : ffff80019ed4e000
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]
 unlock_mount+0x1d8/0x244 fs/namespace.c:2325
 do_new_mount_fc fs/namespace.c:2989 [inline]
 do_new_mount+0x6e4/0x8c4 fs/namespace.c:3042
 path_mount+0x590/0xe58 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3568
 __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:581
irq event stamp: 274
hardirqs last  enabled at (273): [<ffff80000827c624>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline]
hardirqs last  enabled at (273): [<ffff80000827c624>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:5000
hardirqs last disabled at (274): [<ffff80001211cf7c>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (256): [<ffff800008020d74>] softirq_handle_end kernel/softirq.c:414 [inline]
softirqs last  enabled at (256): [<ffff800008020d74>] __do_softirq+0xc14/0xea0 kernel/softirq.c:600
softirqs last disabled at (127): [<ffff80000802a994>] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79
---[ end trace 0000000000000000 ]---

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/24 19:20 linux-6.1.y 802aacbbffe2 49be837e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in unlock_mount
2023/08/23 20:43 linux-6.1.y 802aacbbffe2 b81ca3f6 .config console log report info ci2-linux-6-1-kasan-arm64 WARNING in unlock_mount
2023/08/07 14:48 linux-6.1.y 52a953d0934b dda824c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in unlock_mount
* Struck through repros no longer work on HEAD.