DUID 00:04:ef:eb:16:6a:bb:4b:eb:e8:98:52:3b:5c:58:f5:72:fb forked to background, child pid 3213 [ 37.017822][ T3214] 8021q: adding VLAN 0 to HW filter on device bond0 [ 37.042266][ T3214] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.1.153' (ECDSA) to the list of known hosts. syzkaller login: [ 66.537831][ T3541] cgroup: Unknown subsys name 'net' [ 66.648227][ T3541] cgroup: Unknown subsys name 'rlimit' executing program [ 66.846919][ T3543] [ 66.849284][ T3543] ====================================================== [ 66.856390][ T3543] WARNING: possible circular locking dependency detected [ 66.863457][ T3543] 6.1.33-syzkaller #0 Not tainted [ 66.868478][ T3543] ------------------------------------------------------ [ 66.875513][ T3543] syz-executor273/3543 is trying to acquire lock: [ 66.881924][ T3543] ffffffff8cdc4970 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_slow_inc+0xe/0x20 [ 66.891335][ T3543] [ 66.891335][ T3543] but task is already holding lock: [ 66.898696][ T3543] ffffffff8cf5a608 (freezer_mutex){+.+.}-{3:3}, at: freezer_css_online+0x4b/0x140 [ 66.907925][ T3543] [ 66.907925][ T3543] which lock already depends on the new lock. [ 66.907925][ T3543] [ 66.918325][ T3543] [ 66.918325][ T3543] the existing dependency chain (in reverse order) is: [ 66.927340][ T3543] [ 66.927340][ T3543] -> #1 (freezer_mutex){+.+.}-{3:3}: [ 66.934823][ T3543] lock_acquire+0x1f8/0x5a0 [ 66.939861][ T3543] __mutex_lock_common+0x1d4/0x2520 [ 66.945598][ T3543] mutex_lock_nested+0x17/0x20 [ 66.950890][ T3543] freezer_write+0xa4/0x3f0 [ 66.955917][ T3543] cgroup_file_write+0x2c6/0x690 [ 66.961380][ T3543] kernfs_fop_write_iter+0x3a2/0x4f0 [ 66.967185][ T3543] vfs_write+0x7ae/0xba0 [ 66.971959][ T3543] ksys_write+0x19c/0x2c0 [ 66.976832][ T3543] do_syscall_64+0x3d/0xb0 [ 66.981788][ T3543] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 66.988217][ T3543] [ 66.988217][ T3543] -> #0 (cpu_hotplug_lock){++++}-{0:0}: [ 66.995955][ T3543] validate_chain+0x1667/0x58e0 [ 67.001338][ T3543] __lock_acquire+0x125b/0x1f80 [ 67.006795][ T3543] lock_acquire+0x1f8/0x5a0 [ 67.011834][ T3543] cpus_read_lock+0x3e/0x150 [ 67.016952][ T3543] static_key_slow_inc+0xe/0x20 [ 67.022323][ T3543] freezer_css_online+0xc2/0x140 [ 67.027787][ T3543] online_css+0xba/0x260 [ 67.032624][ T3543] cgroup_apply_control_enable+0x7d1/0xae0 [ 67.038993][ T3543] cgroup_mkdir+0xd8b/0xff0 [ 67.044046][ T3543] kernfs_iop_mkdir+0x275/0x400 [ 67.049440][ T3543] vfs_mkdir+0x3b6/0x590 [ 67.054215][ T3543] do_mkdirat+0x260/0x520 [ 67.059083][ T3543] __x64_sys_mkdirat+0x85/0x90 [ 67.064386][ T3543] do_syscall_64+0x3d/0xb0 [ 67.069353][ T3543] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 67.075788][ T3543] [ 67.075788][ T3543] other info that might help us debug this: [ 67.075788][ T3543] [ 67.086015][ T3543] Possible unsafe locking scenario: [ 67.086015][ T3543] [ 67.093462][ T3543] CPU0 CPU1 [ 67.098844][ T3543] ---- ---- [ 67.104213][ T3543] lock(freezer_mutex); [ 67.108465][ T3543] lock(cpu_hotplug_lock); [ 67.115535][ T3543] lock(freezer_mutex); [ 67.122318][ T3543] lock(cpu_hotplug_lock); [ 67.126852][ T3543] [ 67.126852][ T3543] *** DEADLOCK *** [ 67.126852][ T3543] [ 67.135003][ T3543] 4 locks held by syz-executor273/3543: [ 67.140544][ T3543] #0: ffff88807bac6460 (sb_writers#10){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 [ 67.149785][ T3543] #1: ffff888075361aa0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: filename_create+0x256/0x530 [ 67.160443][ T3543] #2: ffffffff8cf4f6a8 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_kn_lock_live+0xe5/0x290 [ 67.170108][ T3543] #3: ffffffff8cf5a608 (freezer_mutex){+.+.}-{3:3}, at: freezer_css_online+0x4b/0x140 [ 67.179771][ T3543] [ 67.179771][ T3543] stack backtrace: [ 67.185656][ T3543] CPU: 1 PID: 3543 Comm: syz-executor273 Not tainted 6.1.33-syzkaller #0 [ 67.194065][ T3543] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 [ 67.204119][ T3543] Call Trace: [ 67.207398][ T3543] [ 67.210331][ T3543] dump_stack_lvl+0x1e3/0x2cb [ 67.215015][ T3543] ? nf_tcp_handle_invalid+0x642/0x642 [ 67.220483][ T3543] ? print_circular_bug+0x12b/0x1a0 [ 67.225696][ T3543] check_noncircular+0x2fa/0x3b0 [ 67.230653][ T3543] ? add_chain_block+0x850/0x850 [ 67.235598][ T3543] ? lockdep_lock+0x11f/0x2a0 [ 67.240284][ T3543] ? reacquire_held_locks+0x660/0x660 [ 67.246621][ T3543] ? rcu_lock_release+0x5/0x20 [ 67.251403][ T3543] ? _find_first_zero_bit+0xd0/0x100 [ 67.256698][ T3543] validate_chain+0x1667/0x58e0 [ 67.261576][ T3543] ? reacquire_held_locks+0x660/0x660 [ 67.266954][ T3543] ? __lock_acquire+0x125b/0x1f80 [ 67.272018][ T3543] ? mark_lock+0x9a/0x340 [ 67.276351][ T3543] __lock_acquire+0x125b/0x1f80 [ 67.281206][ T3543] lock_acquire+0x1f8/0x5a0 [ 67.285714][ T3543] ? static_key_slow_inc+0xe/0x20 [ 67.290752][ T3543] ? read_lock_is_recursive+0x10/0x10 [ 67.296124][ T3543] ? __might_sleep+0xb0/0xb0 [ 67.300725][ T3543] ? lockdep_hardirqs_on+0x94/0x130 [ 67.305938][ T3543] ? __local_bh_enable_ip+0x164/0x1f0 [ 67.311320][ T3543] cpus_read_lock+0x3e/0x150 [ 67.315942][ T3543] ? static_key_slow_inc+0xe/0x20 [ 67.320971][ T3543] static_key_slow_inc+0xe/0x20 [ 67.325825][ T3543] freezer_css_online+0xc2/0x140 [ 67.330771][ T3543] online_css+0xba/0x260 [ 67.335035][ T3543] cgroup_apply_control_enable+0x7d1/0xae0 [ 67.340870][ T3543] cgroup_mkdir+0xd8b/0xff0 [ 67.345473][ T3543] ? css_task_iter_end+0x2b0/0x2b0 [ 67.350687][ T3543] ? generic_permission+0x21c/0x4f0 [ 67.355904][ T3543] ? css_task_iter_end+0x2b0/0x2b0 [ 67.361032][ T3543] kernfs_iop_mkdir+0x275/0x400 [ 67.365902][ T3543] vfs_mkdir+0x3b6/0x590 [ 67.370163][ T3543] do_mkdirat+0x260/0x520 [ 67.374526][ T3543] ? vfs_mkdir+0x590/0x590 [ 67.378957][ T3543] ? getname_flags+0x1ec/0x4e0 [ 67.383729][ T3543] __x64_sys_mkdirat+0x85/0x90 [ 67.388505][ T3543] do_syscall_64+0x3d/0xb0 [ 67.392932][ T3543] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 67.398829][ T3543] RIP: 0033:0x7f4918aa3e19 [ 67.403246][ T3543] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 15 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 c0 ff ff ff f7 d8 64 89 01 48 [ 67.422863][ T3543] RSP: 002b:00007fffe57bf548 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 67.431288][ T3543] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4918aa3e19 [ 67.439285][ T3543] RDX: 00000000000001ff RSI: 0000000020000180 RDI: 0000000000000003 executing program executing program executing program executing program executing program [ 67.447283][ T3543] RBP: 0000000000000000 R08: 00007fffe57bf570 R09: 00007fffe57bf570 [ 67.455263][ T3543] R10: 00007fffe57bf570 R11: 0000000000000246 R12: 00007fffe57bf56c [ 67.463239][ T3543] R13: 00007fffe57bf580 R14: 00007fffe57bf5c0 R15: 0000000000000000 [ 67.471224][ T3543] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program