loop7: detected capacity change from 0 to 4096
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88804f666c18, owner = 0x0, curr 0xffff8880302d8000, list not empty
WARNING: kernel/locking/rwsem.c:1413 at __up_write kernel/locking/rwsem.c:1412 [inline], CPU#1: syz.7.1819/10957
WARNING: kernel/locking/rwsem.c:1413 at up_write+0x35c/0x4a0 kernel/locking/rwsem.c:1688, CPU#1: syz.7.1819/10957
Modules linked in:
CPU: 1 UID: 0 PID: 10957 Comm: syz.7.1819 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:__up_write kernel/locking/rwsem.c:1412 [inline]
RIP: 0010:up_write+0x40f/0x4a0 kernel/locking/rwsem.c:1688
Code: ed 8b 49 c7 c2 40 03 ed 8b 4c 0f 44 d0 48 8b 7c 24 10 48 c7 c6 e0 05 ed 8b 48 8b 14 24 48 8b 4c 24 08 4d 89 e0 4d 89 f9 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 03 e8 2d 03 e9 d6 fc ff ff 48 c7 c1
RSP: 0018:ffffc900044b7540 EFLAGS: 00010246
RAX: ffffffff8bed0360 RBX: ffff88804f666c18 RCX: ffff88804f666c18
RDX: 0000000000000000 RSI: ffffffff8bed05e0 RDI: ffffffff905b0e70
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffff8880302d8000
R10: ffffffff8bed0360 R11: ffffed1009eccd85 R12: 0000000000000000
R13: ffff88804f666c20 R14: ffff88804f666c70 R15: ffff8880302d8000
FS: 00007f9c91da06c0(0000) GS:ffff888125054000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000420000 CR3: 00000000521b2000 CR4: 0000000000350ef0
Call Trace:
<TASK>
inode_unlock include/linux/fs.h:1034 [inline]
end_dirop+0x7d/0x90 fs/namei.c:2955
end_creating_keep include/linux/namei.h:138 [inline]
ovl_workdir_create+0x4a5/0x8b0 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+0x19ad/0x5d40 fs/overlayfs/super.c:1560
vfs_get_super fs/super.c:1267 [inline]
get_tree_nodev+0xbb/0x150 fs/super.c:1286
vfs_get_tree+0x92/0x2a0 fs/super.c:1694
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3765 [inline]
do_new_mount+0x319/0xdc0 fs/namespace.c:3841
do_mount fs/namespace.c:4174 [inline]
__do_sys_mount fs/namespace.c:4390 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4367
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9c90f9de99
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:00007f9c91da0028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9c91225fa0 RCX: 00007f9c90f9de99
RDX: 0000200000000b80 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f9c91033eaf R08: 0000200000000040 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9c91226038 R14: 00007f9c91225fa0 R15: 00007ffe0477e1d8
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 49 c7 c2 40 03 ed 8b mov $0xffffffff8bed0340,%r10
7: 4c 0f 44 d0 cmove %rax,%r10
b: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi
10: 48 c7 c6 e0 05 ed 8b mov $0xffffffff8bed05e0,%rsi
17: 48 8b 14 24 mov (%rsp),%rdx
1b: 48 8b 4c 24 08 mov 0x8(%rsp),%rcx
20: 4d 89 e0 mov %r12,%r8
23: 4d 89 f9 mov %r15,%r9
26: 41 52 push %r10
* 28: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2d: 48 83 c4 08 add $0x8,%rsp
31: e8 03 e8 2d 03 call 0x32de839
36: e9 d6 fc ff ff jmp 0xfffffd11
3b: 48 rex.W
3c: c7 .byte 0xc7
3d: c1 .byte 0xc1