syzbot


WARNING in unlock_mount

Status: moderation: reported on 2024/04/08 10:56
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+c8facc9509b2512dbef5@syzkaller.appspotmail.com
First crash: 47d, last: 7d21h
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in unlock_mount 3 270d 288d 0/3 auto-obsoleted due to no activity on 2023/12/02 19:20
linux-5.15 WARNING in unlock_mount 2 270d 271d 0/3 auto-obsoleted due to no activity on 2023/12/03 05:00
linux-6.1 WARNING in unlock_mount (2) 3 8d22h 48d 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 = 0xffff0000f5da4ac8, owner = 0x0, curr 0xffff0000c9555ac0, list empty
WARNING: CPU: 0 PID: 10593 at kernel/locking/rwsem.c:1370 __up_write kernel/locking/rwsem.c:1369 [inline]
WARNING: CPU: 0 PID: 10593 at kernel/locking/rwsem.c:1370 up_write+0x524/0x760 kernel/locking/rwsem.c:1632
Modules linked in:
CPU: 0 PID: 10593 Comm: syz-executor.2 Not tainted 6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1369 [inline]
pc : up_write+0x524/0x760 kernel/locking/rwsem.c:1632
lr : __up_write kernel/locking/rwsem.c:1369 [inline]
lr : up_write+0x524/0x760 kernel/locking/rwsem.c:1632
sp : ffff800095fb79e0
x29: ffff800095fb7a70 x28: 1ffff00012bf6f68 x27: 1fffe0001ebb4966
x26: dfff800000000000 x25: 1fffe0001ebb495a x24: ffff0000f5da4b20
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000c9555ac0
x20: ffff0000f5da4ac8 x19: ffff0000f5da4ac8 x18: 1fffe000367b8996
x17: ffff80008eead000 x16: ffff800080333944 x15: 0000000000000001
x14: 1fffe000367bb590 x13: 0000000000000000 x12: 0000000000000003
x11: 0000000000000001 x10: 0000000000000003 x9 : 3cd8867f9d573c00
x8 : 3cd8867f9d573c00 x7 : ffff8000802aa2c0 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0000c9555ac0 x1 : ffff80008afffb40 x0 : ffff800124fc3000
Call trace:
 __up_write kernel/locking/rwsem.c:1369 [inline]
 up_write+0x524/0x760 kernel/locking/rwsem.c:1632
 inode_unlock include/linux/fs.h:800 [inline]
 unlock_mount+0x1d8/0x244 fs/namespace.c:2514
 do_new_mount_fc fs/namespace.c:3295 [inline]
 do_new_mount+0x704/0x900 fs/namespace.c:3354
 path_mount+0x590/0xe04 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3875
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
irq event stamp: 572
hardirqs last  enabled at (571): [<ffff8000802aa360>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1399 [inline]
hardirqs last  enabled at (571): [<ffff8000802aa360>] finish_lock_switch+0xbc/0x1e4 kernel/sched/core.c:5163
hardirqs last disabled at (572): [<ffff80008ae85288>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:470
softirqs last  enabled at (564): [<ffff8000801e6eb8>] softirq_handle_end kernel/softirq.c:400 [inline]
softirqs last  enabled at (564): [<ffff8000801e6eb8>] handle_softirqs+0xa60/0xc34 kernel/softirq.c:582
softirqs last disabled at (451): [<ffff800080020de8>] __do_softirq+0x14/0x20 kernel/softirq.c:588
---[ end trace 0000000000000000 ]---

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/13 21:36 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fda5695d692c fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in unlock_mount
2024/04/04 10:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in unlock_mount
* Struck through repros no longer work on HEAD.