syzbot

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WARNING: CPU: 0 PID: 316 at fs/inode.c:340 drop_nlink+0xce/0x110 fs/inode.c:340
Modules linked in:
CPU: 0 UID: 0 PID: 316 Comm: syz-executor208 Not tainted 6.12.30-syzkaller-g21ed84930c16 #0 fa4558fba7fa11aa57b2c84caea5bf67b39b1b5f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:drop_nlink+0xce/0x110 fs/inode.c:340
Code: 04 00 00 be 08 00 00 00 e8 cf 55 ee ff f0 48 ff 83 b8 04 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 32 58 98 ff <0f> 0b eb 81 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 59 ff ff ff 4c
RSP: 0018:ffffc9000131f0d0 EFLAGS: 00010293
RAX: ffffffff81ed527e RBX: ffff8881163dd040 RCX: ffff888101bf0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000131f0f8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000263e10 R12: dffffc0000000000
R13: 1ffff11022c7ba11 R14: ffff8881163dd088 R15: 0000000000000000
FS:  0000555571cf2380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000010e6f6000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 simple_rmdir+0x153/0x260 fs/libfs.c:781
 vfs_rmdir+0x3dd/0x560 fs/namei.c:4340
 incfs_rmdir fs/incfs/vfs.c:649 [inline]
 dir_rmdir+0x236/0x320 fs/incfs/vfs.c:1352
 vfs_rmdir+0x3dd/0x560 fs/namei.c:4340
 incfs_rmdir fs/incfs/vfs.c:649 [inline]
 dir_rmdir+0x236/0x320 fs/incfs/vfs.c:1352
 vfs_rmdir+0x3dd/0x560 fs/namei.c:4340
 ovl_do_rmdir fs/overlayfs/overlayfs.h:209 [inline]
 ovl_workdir_cleanup+0x192/0x780 fs/overlayfs/readdir.c:1156
 ovl_workdir_create+0x2af/0x750 fs/overlayfs/super.c:303
 ovl_make_workdir fs/overlayfs/super.c:650 [inline]
 ovl_get_workdir+0x328/0x1650 fs/overlayfs/super.c:808
 ovl_fill_super+0x133f/0x36f0 fs/overlayfs/super.c:1381
 vfs_get_super fs/super.c:1283 [inline]
 get_tree_nodev+0xcb/0x170 fs/super.c:1302
 ovl_get_tree+0x20/0x30 fs/overlayfs/params.c:610
 vfs_get_tree+0x9e/0x290 fs/super.c:1817
 do_new_mount+0x251/0xb40 fs/namespace.c:3519
 path_mount+0x688/0x1050 fs/namespace.c:3846
 do_mount fs/namespace.c:3859 [inline]
 __do_sys_mount fs/namespace.c:4069 [inline]
 __se_sys_mount+0x2bd/0x480 fs/namespace.c:4046
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4046
 x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f39d9e22b19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe1bb84188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f39d9e22b19
RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000200000000340 R09: 0000000000000000
R10: 0000000001004040 R11: 0000000000000246 R12: 00007ffe1bb841ac
R13: 00007ffe1bb841e0 R14: 00007ffe1bb841c0 R15: 0000000000000002
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: CPU: 1 PID: 316 at fs/dcache.c:774 fast_dput fs/dcache.c:774 [inline]
WARNING: CPU: 1 PID: 316 at fs/dcache.c:774 dput+0x3cd/0x510 fs/dcache.c:851
Modules linked in:
CPU: 1 UID: 0 PID: 316 Comm: syz-executor208 Tainted: G        W          6.12.30-syzkaller-g21ed84930c16 #0 fa4558fba7fa11aa57b2c84caea5bf67b39b1b5f
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:fast_dput fs/dcache.c:774 [inline]
RIP: 0010:dput+0x3cd/0x510 fs/dcache.c:851
Code: 55 99 ff 48 b8 00 00 00 00 00 fc ff df 48 8b 4d d0 0f b6 04 01 84 c0 0f 85 21 01 00 00 80 0b 40 e9 a8 fe ff ff e8 93 55 99 ff <0f> 0b e9 9c fe ff ff e8 87 55 99 ff 48 89 df e8 2f 01 00 00 84 c0
RSP: 0018:ffffc9000131f3b0 EFLAGS: 00010293

RAX: ffffffff81ec551d RBX: ffff8881163d8000 RCX: ffff888101bf0000
RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001
RBP: ffffc9000131f3e0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000263e68 R12: 00000000ffffff80
R13: ffff8881163d8084 R14: ffff8881163d8080 R15: 1ffff11022c7b010
FS:  0000555571cf2380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe1bb84088 CR3: 000000010e6f6000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 path_put+0x3d/0x70 fs/namei.c:568
 dentry_release+0x53/0xb0 fs/incfs/vfs.c:1587
 __dentry_kill+0x22b/0x5f0 fs/dcache.c:620
 dput+0x3f2/0x510 fs/dcache.c:857
 path_put+0x3d/0x70 fs/namei.c:568
 dentry_release+0x53/0xb0 fs/incfs/vfs.c:1587
 __dentry_kill+0x22b/0x5f0 fs/dcache.c:620
 dput+0x3f2/0x510 fs/dcache.c:857
 ovl_workdir_create+0x2bf/0x750 fs/overlayfs/super.c:304
 ovl_make_workdir fs/overlayfs/super.c:650 [inline]
 ovl_get_workdir+0x328/0x1650 fs/overlayfs/super.c:808
 ovl_fill_super+0x133f/0x36f0 fs/overlayfs/super.c:1381
 vfs_get_super fs/super.c:1283 [inline]
 get_tree_nodev+0xcb/0x170 fs/super.c:1302
 ovl_get_tree+0x20/0x30 fs/overlayfs/params.c:610
 vfs_get_tree+0x9e/0x290 fs/super.c:1817
 do_new_mount+0x251/0xb40 fs/namespace.c:3519
 path_mount+0x688/0x1050 fs/namespace.c:3846
 do_mount fs/namespace.c:3859 [inline]
 __do_sys_mount fs/namespace.c:4069 [inline]
 __se_sys_mount+0x2bd/0x480 fs/namespace.c:4046
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4046
 x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f39d9e22b19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe1bb84188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f39d9e22b19
RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000200000000340 R09: 0000000000000000
R10: 0000000001004040 R11: 0000000000000246 R12: 00007ffe1bb841ac
R13: 00007ffe1bb841e0 R14: 00007ffe1bb841c0 R15: 0000000000000002
 </TASK>
---[ end trace 0000000000000000 ]---
overlayfs: failed to create directory ./bus/work (errno: 17); mounting read-only
overlayfs: maximum fs stacking depth exceeded