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DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88805211d4e8, owner = 0x0, curr 0xffff88803692c880, list empty
WARNING: CPU: 0 PID: 5366 at kernel/locking/rwsem.c:1381 __up_write kernel/locking/rwsem.c:1380 [inline]
WARNING: CPU: 0 PID: 5366 at kernel/locking/rwsem.c:1381 up_write+0x3a2/0x420 kernel/locking/rwsem.c:1643
Modules linked in:
CPU: 0 UID: 0 PID: 5366 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__up_write kernel/locking/rwsem.c:1380 [inline]
RIP: 0010:up_write+0x3a2/0x420 kernel/locking/rwsem.c:1643
Code: d0 48 c7 c7 a0 ee aa 8b 48 c7 c6 c0 f0 aa 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 08 41 52 e8 93 54 e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6d fd ff ff 48 c7 c1 64 f7 c3 8f 80 e1 07 80 c1 03
RSP: 0018:ffffc9000d307cc8 EFLAGS: 00010282
RAX: dea868ddb8d25c00 RBX: ffff88805211d4e8 RCX: ffff88803692c880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1c3a22c R12: 0000000000000000
R13: ffff88805211d540 R14: ffff88805211d4e8 R15: 1ffff1100a423a9e
FS: 00007f7069faf6c0(0000) GS:ffff88808d00a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7069faefc8 CR3: 0000000042aa3000 CR4: 0000000000352ef0
Call Trace:
<TASK>
inode_unlock include/linux/fs.h:880 [inline]
unlock_mount+0x81/0x360 fs/namespace.c:2843
__do_sys_pivot_root fs/namespace.c:4746 [inline]
__se_sys_pivot_root+0x4ae/0xc20 fs/namespace.c:4661
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f706918eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7069faf038 EFLAGS: 00000246 ORIG_RAX: 000000000000009b
RAX: ffffffffffffffda RBX: 00007f70693d6180 RCX: 00007f706918eba9
RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000200000000040
RBP: 00007f7069211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70693d6218 R14: 00007f70693d6180 R15: 00007ffe9051be28
</TASK>