DUID 00:04:4b:a6:d8:97:08:21:27:2e:fd:cf:3e:39:f6:c0:7f:1f forked to background, child pid 3208 [ 39.955741][ T3209] 8021q: adding VLAN 0 to HW filter on device bond0 [ 39.977745][ T3209] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.1.50' (ECDSA) to the list of known hosts. syzkaller login: [ 66.692295][ T3627] cgroup: Unknown subsys name 'net' [ 66.827022][ T3627] cgroup: Unknown subsys name 'rlimit' executing program [ 66.993652][ T3629] [ 66.996016][ T3629] ====================================================== [ 67.003034][ T3629] WARNING: possible circular locking dependency detected [ 67.010061][ T3629] 6.1.15-syzkaller #0 Not tainted [ 67.015077][ T3629] ------------------------------------------------------ [ 67.022089][ T3629] syz-executor617/3629 is trying to acquire lock: [ 67.028504][ T3629] ffffffff8cdc3b30 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_slow_inc+0xe/0x20 [ 67.037919][ T3629] [ 67.037919][ T3629] but task is already holding lock: [ 67.045278][ T3629] ffffffff8cf59988 (freezer_mutex){+.+.}-{3:3}, at: freezer_write+0x9f/0x370 [ 67.054072][ T3629] [ 67.054072][ T3629] which lock already depends on the new lock. [ 67.054072][ T3629] [ 67.064473][ T3629] [ 67.064473][ T3629] the existing dependency chain (in reverse order) is: [ 67.073499][ T3629] [ 67.073499][ T3629] -> #2 (freezer_mutex){+.+.}-{3:3}: [ 67.081013][ T3629] lock_acquire+0x231/0x620 [ 67.086049][ T3629] __mutex_lock_common+0x1d4/0x2520 [ 67.091775][ T3629] mutex_lock_nested+0x17/0x20 [ 67.097059][ T3629] freezer_attach+0xa8/0x280 [ 67.102190][ T3629] cgroup_migrate_execute+0x7c2/0xfe0 [ 67.108108][ T3629] cgroup_attach_task+0x54f/0x930 [ 67.113663][ T3629] __cgroup1_procs_write+0x2ee/0x460 [ 67.119478][ T3629] cgroup_file_write+0x2ad/0x780 [ 67.124957][ T3629] kernfs_fop_write_iter+0x3a2/0x4f0 [ 67.130790][ T3629] vfs_write+0x7ae/0xba0 [ 67.135562][ T3629] ksys_write+0x19c/0x2c0 [ 67.140419][ T3629] do_syscall_64+0x3d/0xb0 [ 67.145357][ T3629] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 67.151798][ T3629] [ 67.151798][ T3629] -> #1 (cgroup_threadgroup_rwsem){++++}-{0:0}: [ 67.160248][ T3629] lock_acquire+0x231/0x620 [ 67.165307][ T3629] percpu_down_write+0x50/0x2e0 [ 67.170684][ T3629] cgroup_procs_write_start+0x1b0/0x600 [ 67.176773][ T3629] __cgroup_procs_write+0xf6/0x4a0 [ 67.182467][ T3629] cgroup_procs_write+0x25/0x50 [ 67.187849][ T3629] cgroup_file_write+0x2ad/0x780 [ 67.193314][ T3629] kernfs_fop_write_iter+0x3a2/0x4f0 [ 67.199124][ T3629] vfs_write+0x7ae/0xba0 [ 67.203894][ T3629] ksys_write+0x19c/0x2c0 [ 67.208752][ T3629] do_syscall_64+0x3d/0xb0 [ 67.213730][ T3629] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 67.220148][ T3629] [ 67.220148][ T3629] -> #0 (cpu_hotplug_lock){++++}-{0:0}: [ 67.227882][ T3629] validate_chain+0x1667/0x58e0 [ 67.233282][ T3629] __lock_acquire+0x125b/0x1f80 [ 67.238677][ T3629] lock_acquire+0x231/0x620 [ 67.243709][ T3629] cpus_read_lock+0x3e/0x130 [ 67.248827][ T3629] static_key_slow_inc+0xe/0x20 [ 67.254215][ T3629] freezer_apply_state+0x1a6/0x3f0 [ 67.259863][ T3629] freezer_write+0x228/0x370 [ 67.264998][ T3629] cgroup_file_write+0x2ad/0x780 [ 67.270486][ T3629] kernfs_fop_write_iter+0x3a2/0x4f0 [ 67.276298][ T3629] vfs_write+0x7ae/0xba0 [ 67.281073][ T3629] ksys_write+0x19c/0x2c0 [ 67.285930][ T3629] do_syscall_64+0x3d/0xb0 [ 67.290865][ T3629] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 67.297291][ T3629] [ 67.297291][ T3629] other info that might help us debug this: [ 67.297291][ T3629] [ 67.307515][ T3629] Chain exists of: [ 67.307515][ T3629] cpu_hotplug_lock --> cgroup_threadgroup_rwsem --> freezer_mutex [ 67.307515][ T3629] [ 67.321245][ T3629] Possible unsafe locking scenario: [ 67.321245][ T3629] [ 67.328687][ T3629] CPU0 CPU1 [ 67.334045][ T3629] ---- ---- [ 67.339404][ T3629] lock(freezer_mutex); [ 67.343646][ T3629] lock(cgroup_threadgroup_rwsem); [ 67.351360][ T3629] lock(freezer_mutex); [ 67.358119][ T3629] lock(cpu_hotplug_lock); [ 67.362618][ T3629] [ 67.362618][ T3629] *** DEADLOCK *** [ 67.362618][ T3629] [ 67.370760][ T3629] 4 locks held by syz-executor617/3629: [ 67.376298][ T3629] #0: ffff8880230b6460 (sb_writers#10){.+.+}-{0:0}, at: vfs_write+0x269/0xba0 [ 67.385299][ T3629] #1: ffff88802868d888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1e7/0x4f0 [ 67.395063][ T3629] #2: ffff888145759a00 (kn->active#56){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20b/0x4f0 [ 67.405107][ T3629] #3: ffffffff8cf59988 (freezer_mutex){+.+.}-{3:3}, at: freezer_write+0x9f/0x370 [ 67.414335][ T3629] [ 67.414335][ T3629] stack backtrace: [ 67.420218][ T3629] CPU: 1 PID: 3629 Comm: syz-executor617 Not tainted 6.1.15-syzkaller #0 [ 67.428625][ T3629] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 [ 67.438701][ T3629] Call Trace: [ 67.442001][ T3629] [ 67.444937][ T3629] dump_stack_lvl+0x1e3/0x2cb [ 67.449620][ T3629] ? nf_tcp_handle_invalid+0x633/0x633 [ 67.455108][ T3629] ? print_circular_bug+0x12b/0x1a0 [ 67.460314][ T3629] check_noncircular+0x2fa/0x3b0 [ 67.465253][ T3629] ? add_chain_block+0x850/0x850 [ 67.470192][ T3629] ? lockdep_lock+0x11f/0x2a0 [ 67.474882][ T3629] ? lockdep_unlock+0x165/0x300 [ 67.479745][ T3629] ? lockdep_lock+0x2a0/0x2a0 [ 67.484425][ T3629] ? _find_first_zero_bit+0xd0/0x100 [ 67.489720][ T3629] validate_chain+0x1667/0x58e0 [ 67.494573][ T3629] ? validate_chain+0x13d1/0x58e0 [ 67.499605][ T3629] ? reacquire_held_locks+0x660/0x660 [ 67.504985][ T3629] ? rcu_lock_release+0x5/0x20 [ 67.509766][ T3629] ? reacquire_held_locks+0x660/0x660 [ 67.515142][ T3629] ? validate_chain+0x115/0x58e0 [ 67.520088][ T3629] ? mark_lock+0x9a/0x340 [ 67.524426][ T3629] __lock_acquire+0x125b/0x1f80 [ 67.529297][ T3629] lock_acquire+0x231/0x620 [ 67.533807][ T3629] ? static_key_slow_inc+0xe/0x20 [ 67.538859][ T3629] ? read_lock_is_recursive+0x10/0x10 [ 67.544242][ T3629] ? mark_lock+0x9a/0x340 [ 67.548570][ T3629] ? __might_sleep+0xb0/0xb0 [ 67.553168][ T3629] cpus_read_lock+0x3e/0x130 [ 67.557769][ T3629] ? static_key_slow_inc+0xe/0x20 [ 67.562909][ T3629] static_key_slow_inc+0xe/0x20 [ 67.567845][ T3629] freezer_apply_state+0x1a6/0x3f0 [ 67.572961][ T3629] ? css_put+0x230/0x230 [ 67.577210][ T3629] ? rcu_lock_release+0x5/0x20 [ 67.581979][ T3629] ? __lock_acquire+0x1f80/0x1f80 [ 67.587017][ T3629] freezer_write+0x228/0x370 [ 67.591610][ T3629] ? freezer_read+0x7a0/0x7a0 [ 67.596288][ T3629] cgroup_file_write+0x2ad/0x780 [ 67.601272][ T3629] ? cgroup_seqfile_stop+0xd0/0xd0 [ 67.606405][ T3629] ? __virt_addr_valid+0x22b/0x2e0 [ 67.611542][ T3629] ? cgroup_seqfile_stop+0xd0/0xd0 [ 67.616668][ T3629] kernfs_fop_write_iter+0x3a2/0x4f0 [ 67.621971][ T3629] vfs_write+0x7ae/0xba0 [ 67.626227][ T3629] ? file_end_write+0x240/0x240 [ 67.631083][ T3629] ? do_sys_openat2+0x42b/0x500 [ 67.635950][ T3629] ? __fdget_pos+0x261/0x2f0 [ 67.640540][ T3629] ksys_write+0x19c/0x2c0 [ 67.644879][ T3629] ? print_irqtrace_events+0x210/0x210 [ 67.650353][ T3629] ? __ia32_sys_read+0x80/0x80 [ 67.655125][ T3629] ? syscall_enter_from_user_mode+0x2e/0x2a0 [ 67.661108][ T3629] ? lockdep_hardirqs_on+0x94/0x130 [ 67.666314][ T3629] ? syscall_enter_from_user_mode+0x2e/0x2a0 [ 67.672304][ T3629] do_syscall_64+0x3d/0xb0 [ 67.676723][ T3629] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 67.682628][ T3629] RIP: 0033:0x7f067eb3bde9 [ 67.687044][ T3629] 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 [ 67.706654][ T3629] RSP: 002b:00007ffd42667f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 67.715085][ T3629] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f067eb3bde9 [ 67.723070][ T3629] RDX: 0000000000000007 RSI: 0000000020000040 RDI: 0000000000000004 [ 67.731043][ T3629] RBP: 0000000000000000 R08: 00007ffd42667f40 R09: 00007ffd42667f40 [ 67.739017][ T3629] R10: 00007ffd42667f40 R11: 0000000000000246 R12: 00007ffd42667f3c executing program executing program executing program executing program executing program executing program executing program [ 67.747007][ T3629] R13: 00007ffd42667f50 R14: 00007ffd42667f90 R15: 0000000000000000 [ 67.754992][ T3629] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program