------------[ cut here ]------------ 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: 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 ---------------- 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