syzbot


WARNING in ovl_workdir_create (3)

Status: upstream: reported on 2024/05/13 18:28
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+8aa3f99a6acb9f8fd429@syzkaller.appspotmail.com
First crash: 36d, last: 36d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [overlayfs?] WARNING in ovl_workdir_create (3) 2 (3) 2024/05/17 15:43
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in ovl_workdir_create overlayfs 1 542d 538d 0/27 auto-obsoleted due to no activity on 2023/04/20 02:11
linux-6.1 WARNING in ovl_workdir_create 1 28d 28d 0/3 upstream: reported on 2024/05/17 13:40
upstream WARNING in ovl_workdir_create (2) overlayfs 1 218d 214d 0/27 auto-obsoleted due to no activity on 2024/02/18 01:53

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888077f311f0, owner = 0x0, curr 0xffff8880787ebc00, list empty
WARNING: CPU: 1 PID: 8339 at kernel/locking/rwsem.c:1369 __up_write kernel/locking/rwsem.c:1369 [inline]
WARNING: CPU: 1 PID: 8339 at kernel/locking/rwsem.c:1369 up_write+0x469/0x520 kernel/locking/rwsem.c:1632
Modules linked in:
CPU: 1 PID: 8339 Comm: syz-executor.2 Not tainted 6.9.0-rc7-syzkaller-00056-g45db3ab70092 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:__up_write kernel/locking/rwsem.c:1369 [inline]
RIP: 0010:up_write+0x469/0x520 kernel/locking/rwsem.c:1632
Code: ea 03 80 3c 02 00 75 53 48 8b 13 4d 89 f1 41 55 4d 89 f8 4c 89 e1 48 c7 c6 40 b7 2c 8b 48 c7 c7 60 b6 2c 8b e8 08 91 e5 ff 90 <0f> 0b 90 90 5a e9 96 fc ff ff 48 89 ef e8 e5 26 7f 00 e9 03 fd ff
RSP: 0018:ffffc90010ac7928 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888077f311f0 RCX: ffffc9000baa6000
RDX: 0000000000040000 RSI: ffffffff81517126 RDI: 0000000000000001
RBP: ffff888077f311f8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000002 R12: ffff888077f311f0
R13: ffffffff8b2cb5a0 R14: ffff8880787ebc00 R15: 0000000000000000
FS:  00007f0eebfff6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020098000 CR3: 0000000021f12000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:800 [inline]
 ovl_workdir_create+0x33e/0x820 fs/overlayfs/super.c:359
 ovl_make_workdir fs/overlayfs/super.c:656 [inline]
 ovl_get_workdir fs/overlayfs/super.c:814 [inline]
 ovl_fill_super+0xe6b/0x6720 fs/overlayfs/super.c:1382
 vfs_get_super fs/super.c:1268 [inline]
 get_tree_nodev+0xdd/0x190 fs/super.c:1287
 vfs_get_tree+0x92/0x380 fs/super.c:1779
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x14e6/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __x64_sys_mount+0x297/0x320 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0eec47dd69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0eebfff0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0eec5ac050 RCX: 00007f0eec47dd69
RDX: 0000000020000080 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 00007f0eec4ca49e R08: 0000000020000200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f0eec5ac050 R15: 00007ffe9e328388
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/09 18:22 upstream 45db3ab70092 de979bc2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ovl_workdir_create
* Struck through repros no longer work on HEAD.