syzbot


WARNING in do_new_mount (4)

Status: moderation: reported on 2025/03/14 08:42
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+9e31eb6b6705a7f80cec@syzkaller.appspotmail.com
First crash: 55d, last: 49d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in do_new_mount 2 621d 639d 0/3 auto-obsoleted due to no activity on 2023/11/29 20:19
upstream WARNING in do_new_mount fs 4 634d 652d 0/28 auto-obsoleted due to no activity on 2023/11/07 02:18
upstream WARNING in do_new_mount (3) fs 1 121d 117d 0/28 auto-obsoleted due to no activity on 2025/03/03 15:54
linux-6.1 WARNING in do_new_mount 4 291d 395d 0/3 auto-obsoleted due to no activity on 2024/10/24 11:22
upstream WARNING in do_new_mount (2) fs 22 237d 391d 0/28 auto-obsoleted due to no activity on 2024/12/07 21:46

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff8880459d4e38, owner = 0x0, curr 0xffff8880001d2440, list empty
WARNING: CPU: 0 PID: 5324 at kernel/locking/rwsem.c:1368 __up_write kernel/locking/rwsem.c:1367 [inline]
WARNING: CPU: 0 PID: 5324 at kernel/locking/rwsem.c:1368 up_write+0x502/0x590 kernel/locking/rwsem.c:1630
Modules linked in:
CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.14.0-rc6-syzkaller-00205-g3571e8b091f4 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__up_write kernel/locking/rwsem.c:1367 [inline]
RIP: 0010:up_write+0x502/0x590 kernel/locking/rwsem.c:1630
Code: c7 c7 c0 a7 2a 8c 48 c7 c6 e0 a9 2a 8c 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 e3 81 e5 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6a fd ff ff 48 c7 c1 14 2d 3d 90 80 e1 07 80 c1 03
RSP: 0018:ffffc9000d337c60 EFLAGS: 00010296
RAX: a4943b37fd070b00 RBX: ffffffff8c2aa8a0 RCX: ffff8880001d2440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000d337d30 R08: ffffffff81819e52 R09: fffffbfff1d3a69c
R10: dffffc0000000000 R11: fffffbfff1d3a69c R12: 0000000000000000
R13: ffff8880459d4e38 R14: 1ffff92001a66f94 R15: dffffc0000000000
FS:  00007fc088b2e6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc088b2dfe0 CR3: 0000000040940000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:882 [inline]
 unlock_mount fs/namespace.c:2709 [inline]
 do_new_mount_fc fs/namespace.c:3503 [inline]
 do_new_mount+0x88e/0xb40 fs/namespace.c:3562
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc087d8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc088b2e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc087fa6160 RCX: 00007fc087d8d169
RDX: 0000400000000000 RSI: 0000400000000140 RDI: 0000000000000000
RBP: 00007fc087e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc087fa6160 R15: 00007ffd703d2058
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/15 20:51 upstream 3571e8b091f4 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_new_mount
2025/03/10 08:36 upstream 80e54e84911a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_new_mount
* Struck through repros no longer work on HEAD.