syzbot


WARNING in do_unlinkat

Status: upstream: reported on 2024/05/13 03:47
Reported-by: syzbot+f6c5f49bfe015c682771@syzkaller.appspotmail.com
First crash: 33d, last: 29d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in do_unlinkat fs 2 23d 19d 0/27 moderation: reported on 2024/05/27 02:23
linux-5.15 WARNING in do_unlinkat 1 72d 72d 0/3 upstream: reported on 2024/04/03 10:00

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88806f841950, owner = 0x0, curr 0xffff888072a93b80, list empty
WARNING: CPU: 1 PID: 7090 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 1 PID: 7090 at kernel/locking/rwsem.c:1372 up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 1 PID: 7090 Comm: syz-executor.3 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:__up_write kernel/locking/rwsem.c:1371 [inline]
RIP: 0010:up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626
Code: 48 c7 c7 60 f5 eb 8a 48 c7 c6 a0 f7 eb 8a 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 df d7 e8 ff 48 83 c4 08 <0f> 0b e9 71 fd ff ff 48 c7 c1 e8 b6 73 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000546fce0 EFLAGS: 00010292
RAX: 69634998759a5200 RBX: ffffffff8aebf640 RCX: 0000000000040000
RDX: ffffc9000e013000 RSI: 0000000000011233 RDI: 0000000000011234
RBP: ffffc9000546fdb0 R08: ffffffff81528ede R09: fffff52000a8defd
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff88806f841950 R14: 1ffff92000a8dfa4 R15: dffffc0000000000
FS:  00007fcb94b0e6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020eb6030 CR3: 00000000794d7000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:763 [inline]
 do_unlinkat+0x4f7/0x820 fs/namei.c:4397
 __do_sys_unlink fs/namei.c:4440 [inline]
 __se_sys_unlink fs/namei.c:4438 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4438
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcb93e7cee9
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:00007fcb94b0e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007fcb93fac050 RCX: 00007fcb93e7cee9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0
RBP: 00007fcb93ec949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fcb93fac050 R15: 00007fff0ce0d9c8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/16 18:01 linux-6.1.y 909ba1f1b414 c2e07261 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in do_unlinkat
2024/05/13 03:47 linux-6.1.y 909ba1f1b414 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in do_unlinkat
* Struck through repros no longer work on HEAD.