syzbot


WARNING in do_new_mount

Status: upstream: reported on 2024/04/04 01:32
Reported-by: syzbot+ef4f58d71e51fa05b046@syzkaller.appspotmail.com
First crash: 82d, last: 16d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in do_new_mount 2 308d 326d 0/3 auto-obsoleted due to no activity on 2023/11/29 20:19
upstream WARNING in do_new_mount fs 4 320d 339d 0/27 auto-obsoleted due to no activity on 2023/11/07 02:18
upstream WARNING in do_new_mount (2) fs 15 12h46m 78d 0/27 moderation: reported on 2024/04/07 12:38

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888055dc1bc0, owner = 0x0, curr 0xffff88805b519dc0, list empty
WARNING: CPU: 1 PID: 7250 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 1 PID: 7250 at kernel/locking/rwsem.c:1372 up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 1 PID: 7250 Comm: syz-executor.1 Not tainted 6.1.92-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 28 be 73 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000384fc80 EFLAGS: 00010292
RAX: 787a0e387e5bac00 RBX: ffffffff8aebf640 RCX: 0000000000040000
RDX: ffffc90003e51000 RSI: 0000000000012342 RDI: 0000000000012343
RBP: ffffc9000384fd50 R08: ffffffff81528ede R09: fffff52000709ef1
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff888055dc1bc0 R14: 1ffff92000709f98 R15: dffffc0000000000
FS:  00007f39d69986c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005dde8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:763 [inline]
 unlock_mount fs/namespace.c:2325 [inline]
 do_new_mount_fc fs/namespace.c:2994 [inline]
 do_new_mount+0x883/0xb40 fs/namespace.c:3053
 do_mount fs/namespace.c:3394 [inline]
 __do_sys_mount fs/namespace.c:3602 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3579
 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: 0033:0x7f39d5c7cf69
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:00007f39d69980c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f39d5db4120 RCX: 00007f39d5c7cf69
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f39d5cda6fe R08: 0000000020000280 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f39d5db4120 R15: 00007ffe01878c58
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/08 18:28 linux-6.1.y 88690811da69 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in do_new_mount
2024/04/10 14:32 linux-6.1.y 347385861c50 4320ec32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in do_new_mount
2024/04/04 01:31 linux-6.1.y 347385861c50 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in do_new_mount
* Struck through repros no longer work on HEAD.