syzbot

------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff0000f526f318, owner = 0x0, curr 0xffff0000db51d340, list empty
WARNING: CPU: 1 PID: 4821 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 1 PID: 4821 at kernel/locking/rwsem.c:1372 up_write+0x494/0x5bc kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 1 PID: 4821 Comm: syz.4.108 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1371 [inline]
pc : up_write+0x494/0x5bc kernel/locking/rwsem.c:1626
lr : __up_write kernel/locking/rwsem.c:1371 [inline]
lr : up_write+0x494/0x5bc kernel/locking/rwsem.c:1626
sp : ffff800021117ab0
x29: ffff800021117ac0 x28: 1fffe0001b29c0bc x27: dfff800000000000
x26: dfff800000000000 x25: 1fffe0001ea4de70 x24: ffff0000f526f370
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000db51d340
x20: ffff0000f526f318 x19: ffff0000f526f318 x18: ffff800011b9bf60
x17: 1fffe00033eaa57e x16: ffff8000082d92bc x15: 0000000040000000
x14: 0000000000000001 x13: 1fffe00033eacc30 x12: 0000000000ff0100
x11: ff0080000a8df3f0 x10: 0000000000000003 x9 : a5c15130d8108100
x8 : a5c15130d8108100 x7 : ffff800008257984 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff800021117640 x1 : ffff800011b9da80 x0 : ffff80018a3dd000
Call trace:
 __up_write kernel/locking/rwsem.c:1371 [inline]
 up_write+0x494/0x5bc kernel/locking/rwsem.c:1626
 inode_unlock include/linux/fs.h:763 [inline]
 unlock_mount+0x1d4/0x240 fs/namespace.c:2337
 do_new_mount_fc fs/namespace.c:3021 [inline]
 do_new_mount+0x658/0x810 fs/namespace.c:3080
 path_mount+0x5bc/0xe80 fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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: 584
hardirqs last  enabled at (583): [<ffff800008257a18>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (583): [<ffff800008257a18>] finish_lock_switch+0xb0/0x1c4 kernel/sched/core.c:5004
hardirqs last disabled at (584): [<ffff800011a389f4>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (576): [<ffff8000081ac394>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last  enabled at (576): [<ffff8000081ac394>] handle_softirqs+0xaec/0xc60 kernel/softirq.c:624
softirqs last disabled at (565): [<ffff800008020164>] __do_softirq+0x14/0x20 kernel/softirq.c:630
---[ end trace 0000000000000000 ]---