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DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888058bc3ba0, owner = 0x0, curr 0xffff888037079ec0, list not empty
WARNING: kernel/locking/rwsem.c:1411 at __up_write kernel/locking/rwsem.c:1410 [inline], CPU#1: syz.5.6434/28844
WARNING: kernel/locking/rwsem.c:1411 at up_write+0x2d4/0x410 kernel/locking/rwsem.c:1682, CPU#1: syz.5.6434/28844
Modules linked in:
CPU: 1 UID: 0 PID: 28844 Comm: syz.5.6434 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__up_write kernel/locking/rwsem.c:1410 [inline]
RIP: 0010:up_write+0x384/0x410 kernel/locking/rwsem.c:1682
Code: cc 8b 49 c7 c2 a0 f0 cc 8b 4c 0f 44 d0 48 8b 7c 24 08 48 c7 c6 40 f3 cc 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 10 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 ae 50 0b 03 e9 6b fd ff ff 48 c7 c1
RSP: 0018:ffffc900064ef540 EFLAGS: 00010246
RAX: ffffffff8bccf0c0 RBX: ffff888058bc3ba0 RCX: ffff888058bc3ba0
RDX: 0000000000000000 RSI: ffffffff8bccf340 RDI: ffffffff903564b0
RBP: ffff888058bc3bf8 R08: 0000000000000000 R09: ffff888037079ec0
R10: ffffffff8bccf0c0 R11: ffffed100b178776 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888058bc3ba0 R15: 1ffff1100b178775
FS: 00007fdd22da26c0(0000) GS:ffff888125345000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c3e233e9c CR3: 000000009461d000 CR4: 0000000000350ef0
Call Trace:
<TASK>
inode_unlock include/linux/fs.h:1039 [inline]
end_dirop+0x7d/0x90 fs/namei.c:2951
end_creating_keep include/linux/namei.h:144 [inline]
ovl_workdir_create+0x51d/0x940 fs/overlayfs/super.c:346
ovl_make_workdir fs/overlayfs/super.c:678 [inline]
ovl_get_workdir fs/overlayfs/super.c:836 [inline]
ovl_fill_super_creds fs/overlayfs/super.c:1449 [inline]
ovl_fill_super+0x1a38/0x5e20 fs/overlayfs/super.c:1560
vfs_get_super fs/super.c:1327 [inline]
get_tree_nodev+0xbb/0x150 fs/super.c:1346
vfs_get_tree+0x92/0x2a0 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3758 [inline]
do_new_mount+0x341/0xd30 fs/namespace.c:3834
do_mount fs/namespace.c:4167 [inline]
__do_sys_mount fs/namespace.c:4383 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4360
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd21f9c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdd22da2028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fdd22216090 RCX: 00007fdd21f9c819
RDX: 0000200000000b80 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007fdd22032c91 R08: 0000200000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdd22216128 R14: 00007fdd22216090 R15: 00007fff842ad978
</TASK>
----------------
Code disassembly (best guess):
0: cc int3
1: 8b 49 c7 mov -0x39(%rcx),%ecx
4: c2 a0 f0 ret $0xf0a0
7: cc int3
8: 8b 4c 0f 44 mov 0x44(%rdi,%rcx,1),%ecx
c: d0 48 8b rorb $1,-0x75(%rax)
f: 7c 24 jl 0x35
11: 08 48 c7 or %cl,-0x39(%rax)
14: c6 40 f3 cc movb $0xcc,-0xd(%rax)
18: 8b 48 8b mov -0x75(%rax),%ecx
1b: 14 24 adc $0x24,%al
1d: 4c 89 f1 mov %r14,%rcx
20: 4d 89 e0 mov %r12,%r8
23: 4c 8b 4c 24 10 mov 0x10(%rsp),%r9
28: 41 52 push %r10
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 83 c4 08 add $0x8,%rsp
33: e8 ae 50 0b 03 call 0x30b50e6
38: e9 6b fd ff ff jmp 0xfffffda8
3d: 48 rex.W
3e: c7 .byte 0xc7
3f: c1 .byte 0xc1