syzbot


WARNING in do_move_mount

Status: moderation: reported on 2024/06/26 02:35
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+603b2233130726c12fe1@syzkaller.appspotmail.com
First crash: 21d, last: 21d

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88805c6e36a0, owner = 0x0, curr 0xffff888022165a00, list empty
WARNING: CPU: 1 PID: 7422 at kernel/locking/rwsem.c:1370 __up_write kernel/locking/rwsem.c:1369 [inline]
WARNING: CPU: 1 PID: 7422 at kernel/locking/rwsem.c:1370 up_write+0x502/0x590 kernel/locking/rwsem.c:1632
Modules linked in:
CPU: 1 PID: 7422 Comm: syz-executor.0 Not tainted 6.10.0-rc4-syzkaller-00164-g66cc544fd75c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:__up_write kernel/locking/rwsem.c:1369 [inline]
RIP: 0010:up_write+0x502/0x590 kernel/locking/rwsem.c:1632
Code: c7 c7 c0 ae ca 8b 48 c7 c6 40 b1 ca 8b 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 73 a6 e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6a fd ff ff 48 c7 c1 e0 4c ac 8f 80 e1 07 80 c1 03
RSP: 0018:ffffc9000ea27c60 EFLAGS: 00010296
RAX: 473fb901f567bb00 RBX: ffffffff8bcaafa0 RCX: 0000000000040000
RDX: ffffc90012281000 RSI: 000000000000b1fa RDI: 000000000000b1fb
RBP: ffffc9000ea27d30 R08: ffffffff81585742 R09: fffffbfff1c39994
R10: dffffc0000000000 R11: fffffbfff1c39994 R12: 0000000000000000
R13: ffff88805c6e36a0 R14: 1ffff92001d44f94 R15: dffffc0000000000
FS:  00007faa69d766c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdeaf3268e5 CR3: 0000000056924000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:796 [inline]
 unlock_mount fs/namespace.c:2514 [inline]
 do_move_mount+0x273/0x800 fs/namespace.c:3201
 __do_sys_move_mount fs/namespace.c:4119 [inline]
 __se_sys_move_mount+0x271/0xd20 fs/namespace.c:4071
 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: 0033:0x7faa6907d0a9
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:00007faa69d760c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ad
RAX: ffffffffffffffda RBX: 00007faa691b4050 RCX: 00007faa6907d0a9
RDX: ffffffffffffff9c RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00007faa690ec074 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000180 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007faa691b4050 R15: 00007ffffa0a5488
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/22 03:44 upstream 66cc544fd75c edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in do_move_mount
2024/06/22 02:25 upstream 66cc544fd75c edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in do_move_mount
* Struck through repros no longer work on HEAD.