[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.640550] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.837478] random: sshd: uninitialized urandom read (32 bytes read) [ 25.182816] random: sshd: uninitialized urandom read (32 bytes read) [ 26.056456] random: sshd: uninitialized urandom read (32 bytes read) [ 56.491000] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. [ 62.036934] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 122.864294] ------------[ cut here ]------------ [ 122.870399] ODEBUG: free active (active state 0) object type: work_struct hint: p9_read_work+0x0/0x1060 [ 122.880056] WARNING: CPU: 1 PID: 8111 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 122.888781] Kernel panic - not syncing: panic_on_warn set ... [ 122.888781] [ 122.896124] CPU: 1 PID: 8111 Comm: syz-executor368 Not tainted 4.18.0-rc4+ #141 [ 122.903545] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 122.912874] Call Trace: [ 122.915443] dump_stack+0x1c9/0x2b4 [ 122.919050] ? dump_stack_print_info.cold.2+0x52/0x52 [ 122.924220] panic+0x238/0x4e7 [ 122.927408] ? add_taint.cold.5+0x16/0x16 [ 122.931623] ? __warn.cold.8+0x148/0x1ba [ 122.935662] ? __warn.cold.8+0x117/0x1ba [ 122.939712] ? debug_print_object+0x16a/0x210 [ 122.944208] __warn.cold.8+0x163/0x1ba [ 122.948082] ? debug_print_object+0x16a/0x210 [ 122.952557] report_bug+0x252/0x2d0 [ 122.956162] do_error_trap+0x1fc/0x4d0 [ 122.960035] ? math_error+0x3e0/0x3e0 [ 122.963821] ? fork_usermode_blob+0x1b0/0x1b0 [ 122.968294] ? vprintk_default+0x28/0x30 [ 122.972334] ? vprintk_func+0x81/0xe7 [ 122.976110] ? printk+0xa7/0xcf [ 122.979373] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 122.984192] do_invalid_op+0x1b/0x20 [ 122.987894] invalid_op+0x14/0x20 [ 122.991329] RIP: 0010:debug_print_object+0x16a/0x210 [ 122.996403] Code: 1a 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd a0 71 1a 88 4c 89 f6 48 c7 c7 40 67 1a 88 e8 c6 94 e6 fd <0f> 0b 83 05 d9 66 3e 06 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f [ 123.015535] RSP: 0018:ffff8801a94a72d8 EFLAGS: 00010086 [ 123.020876] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 123.028133] RDX: 0000000000000000 RSI: ffffffff81631821 RDI: 0000000000000001 [ 123.035393] RBP: ffff8801a94a7318 R08: ffff8801c3ab81c0 R09: ffffed003b5e3ec2 [ 123.042650] R10: ffffed003b5e3ec2 R11: ffff8801daf1f617 R12: 0000000000000001 [ 123.049898] R13: ffffffff88f63820 R14: ffffffff881a6be0 R15: ffffffff814ea9c0 [ 123.057157] ? fork_usermode_blob+0x1b0/0x1b0 [ 123.061649] ? vprintk_func+0x81/0xe7 [ 123.065440] ? debug_print_object+0x16a/0x210 [ 123.069914] debug_check_no_obj_freed+0x3b2/0x595 [ 123.074738] ? lock_downgrade+0x8f0/0x8f0 [ 123.078866] ? free_obj_work+0xbb0/0xbb0 [ 123.082910] kfree+0xc7/0x260 [ 123.086008] p9_fd_close+0x416/0x5b0 [ 123.089710] ? p9_poll_workfn+0x6d0/0x6d0 [ 123.093848] ? p9_fd_show_options+0x1c0/0x1c0 [ 123.098323] ? lockdep_init_map+0x9/0x10 [ 123.102376] p9_client_create+0xac2/0x16c9 [ 123.106590] ? p9_client_read+0xc60/0xc60 [ 123.110716] ? find_held_lock+0x36/0x1c0 [ 123.114849] ? __lockdep_init_map+0x105/0x590 [ 123.119327] ? kasan_check_write+0x14/0x20 [ 123.123538] ? __init_rwsem+0x1cc/0x2a0 [ 123.127489] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 123.132482] ? rcu_read_lock_sched_held+0x108/0x120 [ 123.137486] ? __kmalloc_track_caller+0x5f5/0x760 [ 123.142315] ? save_stack+0xa9/0xd0 [ 123.145931] ? save_stack+0x43/0xd0 [ 123.149549] ? kasan_kmalloc+0xc4/0xe0 [ 123.153431] ? kmem_cache_alloc_trace+0x152/0x780 [ 123.158264] ? memcpy+0x45/0x50 [ 123.161526] v9fs_session_init+0x21a/0x1a80 [ 123.166006] ? find_held_lock+0x36/0x1c0 [ 123.170049] ? v9fs_show_options+0x7e0/0x7e0 [ 123.174438] ? kasan_check_read+0x11/0x20 [ 123.178562] ? rcu_is_watching+0x8c/0x150 [ 123.182683] ? rcu_pm_notify+0xc0/0xc0 [ 123.186551] ? v9fs_mount+0x61/0x900 [ 123.190244] ? rcu_read_lock_sched_held+0x108/0x120 [ 123.195241] ? kmem_cache_alloc_trace+0x616/0x780 [ 123.200076] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 123.205604] v9fs_mount+0x7c/0x900 [ 123.209127] mount_fs+0xae/0x328 [ 123.212472] vfs_kern_mount.part.34+0xdc/0x4e0 [ 123.217034] ? may_umount+0xb0/0xb0 [ 123.220642] ? _raw_read_unlock+0x22/0x30 [ 123.224773] ? __get_fs_type+0x97/0xc0 [ 123.228642] do_mount+0x581/0x30e0 [ 123.232161] ? do_raw_spin_unlock+0xa7/0x2f0 [ 123.236547] ? copy_mount_string+0x40/0x40 [ 123.240762] ? copy_mount_options+0x5f/0x380 [ 123.245151] ? rcu_read_lock_sched_held+0x108/0x120 [ 123.250156] ? kmem_cache_alloc_trace+0x616/0x780 [ 123.254989] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 123.260511] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 123.266027] ? copy_mount_options+0x285/0x380 [ 123.270511] ksys_mount+0x12d/0x140 [ 123.274120] __x64_sys_mount+0xbe/0x150 [ 123.278095] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 123.283091] do_syscall_64+0x1b9/0x820 [ 123.286966] ? finish_task_switch+0x1d3/0x870 [ 123.291441] ? syscall_return_slowpath+0x5e0/0x5e0 [ 123.296358] ? syscall_return_slowpath+0x31d/0x5e0 [ 123.301268] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 123.306791] ? retint_user+0x18/0x18 [ 123.310494] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 123.315319] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 123.320497] RIP: 0033:0x445d09 [ 123.323673] Code: e8 ec ba 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 ab 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 123.342793] RSP: 002b:00007fce16130da8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 123.350491] RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445d09 [ 123.357765] RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 0000000000000000 [ 123.365028] RBP: 0000000000000000 R08: 0000000020000100 R09: 0000000000000000 [ 123.372287] R10: 0000000000200000 R11: 0000000000000202 R12: 00000000006dbc20 [ 123.379553] R13: 64663d736e617274 R14: 0030656c69662f2e R15: 0000000000000001 [ 123.386811] [ 123.386814] ====================================================== [ 123.386817] WARNING: possible circular locking dependency detected [ 123.386820] 4.18.0-rc4+ #141 Not tainted [ 123.386823] ------------------------------------------------------ [ 123.386826] syz-executor368/8111 is trying to acquire lock: [ 123.386827] (____ptrval____) ((console_sem).lock){-...}, at: down_trylock+0x13/0x70 [ 123.386835] [ 123.386838] but task is already holding lock: [ 123.386839] (____ptrval____) (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x16c/0x595 [ 123.386848] [ 123.386850] which lock already depends on the new lock. [ 123.386851] [ 123.386853] [ 123.386856] the existing dependency chain (in reverse order) is: [ 123.386857] [ 123.386858] -> #3 (&obj_hash[i].lock){-.-.}: [ 123.386866] _raw_spin_lock_irqsave+0x96/0xc0 [ 123.386868] __debug_object_init+0x127/0x12e0 [ 123.386871] debug_object_init+0x16/0x20 [ 123.386873] hrtimer_init+0x97/0x480 [ 123.386875] init_dl_task_timer+0x1b/0x50 [ 123.386877] __sched_fork+0x2ae/0x590 [ 123.386879] init_idle+0x75/0x7a0 [ 123.386881] sched_init+0xbf3/0xd2c [ 123.386884] start_kernel+0x47d/0x949 [ 123.386886] x86_64_start_reservations+0x29/0x2b [ 123.386889] x86_64_start_kernel+0x76/0x79 [ 123.386891] secondary_startup_64+0xa5/0xb0 [ 123.386892] [ 123.386893] -> #2 (&rq->lock){-.-.}: [ 123.386901] _raw_spin_lock+0x2a/0x40 [ 123.386903] task_fork_fair+0x93/0x680 [ 123.386905] sched_fork+0x446/0xb40 [ 123.386908] copy_process.part.39+0x1c09/0x7220 [ 123.386910] _do_fork+0x291/0x12a0 [ 123.386912] kernel_thread+0x34/0x40 [ 123.386914] rest_init+0x22/0xe4 [ 123.386916] start_kernel+0x90e/0x949 [ 123.386918] x86_64_start_reservations+0x29/0x2b [ 123.386921] x86_64_start_kernel+0x76/0x79 [ 123.386923] secondary_startup_64+0xa5/0xb0 [ 123.386924] [ 123.386926] -> #1 (&p->pi_lock){-.-.}: [ 123.386933] _raw_spin_lock_irqsave+0x96/0xc0 [ 123.386935] try_to_wake_up+0xd2/0x12b0 [ 123.386938] wake_up_process+0x10/0x20 [ 123.386940] __up.isra.1+0x1c0/0x2a0 [ 123.386942] up+0x13c/0x1c0 [ 123.386944] __up_console_sem+0xbe/0x1b0 [ 123.386947] console_unlock+0x7a2/0x10b0 [ 123.386949] vprintk_emit+0x6c6/0xdf0 [ 123.386951] vprintk_default+0x28/0x30 [ 123.386953] vprintk_func+0x7a/0xe7 [ 123.386955] printk+0xa7/0xcf [ 123.386957] load_umh+0x51/0xbd [ 123.386959] do_one_initcall+0x127/0x913 [ 123.386961] kernel_init_freeable+0x49b/0x58e [ 123.386964] kernel_init+0x11/0x1b3 [ 123.386966] ret_from_fork+0x3a/0x50 [ 123.386967] [ 123.386968] -> #0 ((console_sem).lock){-...}: [ 123.386976] lock_acquire+0x1e4/0x540 [ 123.386978] _raw_spin_lock_irqsave+0x96/0xc0 [ 123.386980] down_trylock+0x13/0x70 [ 123.386983] __down_trylock_console_sem+0xae/0x200 [ 123.386985] console_trylock+0x15/0xa0 [ 123.386987] vprintk_emit+0x6ad/0xdf0 [ 123.386989] vprintk_default+0x28/0x30 [ 123.386991] vprintk_func+0x7a/0xe7 [ 123.386993] printk+0xa7/0xcf [ 123.386996] __warn_printk+0x8c/0xe0 [ 123.386998] debug_print_object+0x16a/0x210 [ 123.387001] debug_check_no_obj_freed+0x3b2/0x595 [ 123.387002] kfree+0xc7/0x260 [ 123.387005] p9_fd_close+0x416/0x5b0 [ 123.387007] p9_client_create+0xac2/0x16c9 [ 123.387009] v9fs_session_init+0x21a/0x1a80 [ 123.387011] v9fs_mount+0x7c/0x900 [ 123.387013] mount_fs+0xae/0x328 [ 123.387016] vfs_kern_mount.part.34+0xdc/0x4e0 [ 123.387018] do_mount+0x581/0x30e0 [ 123.387020] ksys_mount+0x12d/0x140 [ 123.387022] __x64_sys_mount+0xbe/0x150 [ 123.387024] do_syscall_64+0x1b9/0x820 [ 123.387027] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 123.387028] [ 123.387031] other info that might help us debug this: [ 123.387032] [ 123.387034] Chain exists of: [ 123.387035] (console_sem).lock --> &rq->lock --> &obj_hash[i].lock [ 123.387045] [ 123.387047] Possible unsafe locking scenario: [ 123.387048] [ 123.387050] CPU0 CPU1 [ 123.387053] ---- ---- [ 123.387054] lock(&obj_hash[i].lock); [ 123.387059] lock(&rq->lock); [ 123.387064] lock(&obj_hash[i].lock); [ 123.387069] lock((console_sem).lock); [ 123.387073] [ 123.387074] *** DEADLOCK *** [ 123.387076] [ 123.387078] 1 lock held by syz-executor368/8111: [ 123.387079] #0: (____ptrval____) (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x16c/0x595 [ 123.387089] [ 123.387091] stack backtrace: [ 123.387094] CPU: 1 PID: 8111 Comm: syz-executor368 Not tainted 4.18.0-rc4+ #141 [ 123.387098] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 123.387100] Call Trace: [ 123.387102] dump_stack+0x1c9/0x2b4 [ 123.387105] ? dump_stack_print_info.cold.2+0x52/0x52 [ 123.387107] ? vprintk_func+0xd0/0xe7 [ 123.387110] print_circular_bug.isra.36.cold.57+0x1bd/0x27d [ 123.387112] ? save_trace+0xe0/0x290 [ 123.387114] __lock_acquire+0x3449/0x5020 [ 123.387116] ? trace_hardirqs_on+0x10/0x10 [ 123.387119] ? trace_hardirqs_on+0x10/0x10 [ 123.387121] ? lock_is_held_type+0x210/0x210 [ 123.387123] ? print_usage_bug+0xc0/0xc0 [ 123.387125] ? trace_hardirqs_on+0x10/0x10 [ 123.387128] ? __lock_acquire+0x7fc/0x5020 [ 123.387130] ? find_held_lock+0x36/0x1c0 [ 123.387132] ? graph_lock+0x170/0x170 [ 123.387134] ? __lock_acquire+0x7fc/0x5020 [ 123.387137] ? trace_hardirqs_on+0x10/0x10 [ 123.387139] lock_acquire+0x1e4/0x540 [ 123.387141] ? down_trylock+0x13/0x70 [ 123.387143] ? lock_release+0xa30/0xa30 [ 123.387145] ? lock_downgrade+0x8f0/0x8f0 [ 123.387148] ? kvm_sched_clock_read+0x9/0x20 [ 123.387150] ? sched_clock+0x31/0x40 [ 123.387152] ? vprintk_emit+0x6ad/0xdf0 [ 123.387154] _raw_spin_lock_irqsave+0x96/0xc0 [ 123.387156] ? down_trylock+0x13/0x70 [ 123.387158] down_trylock+0x13/0x70 [ 123.387161] __down_trylock_console_sem+0xae/0x200 [ 123.387163] console_trylock+0x15/0xa0 [ 123.387165] vprintk_emit+0x6ad/0xdf0 [ 123.387167] ? get_work_pool+0x14c/0x260 [ 123.387170] ? wake_up_klogd+0x110/0x110 [ 123.387172] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 123.387174] ? trace_hardirqs_on+0xd/0x10 [ 123.387177] ? flush_work+0x545/0x900 [ 123.387179] ? try_to_grab_pending+0x180/0x9c0 [ 123.387181] ? find_held_lock+0x36/0x1c0 [ 123.387184] ? fork_usermode_blob+0x1b0/0x1b0 [ 123.387186] vprintk_default+0x28/0x30 [ 123.387188] vprintk_func+0x7a/0xe7 [ 123.387190] printk+0xa7/0xcf [ 123.387192] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 123.387194] ? __warn_printk+0x80/0xe0 [ 123.387196] ? p9_conn_cancel+0xd30/0xd30 [ 123.387199] __warn_printk+0x8c/0xe0 [ 123.387201] ? test_taint+0x20/0x20 [ 123.387203] ? __free_object+0x173/0x340 [ 123.387205] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 123.387208] ? p9_conn_cancel+0xd30/0xd30 [ 123.387210] debug_print_object+0x16a/0x210 [ 123.387213] debug_check_no_obj_freed+0x3b2/0x595 [ 123.387215] ? lock_downgrade+0x8f0/0x8f0 [ 123.387217] ? free_obj_work+0xbb0/0xbb0 [ 123.387219] kfree+0xc7/0x260 [ 123.387221] p9_fd_close+0x416/0x5b0 [ 123.387223] ? p9_poll_workfn+0x6d0/0x6d0 [ 123.387226] ? p9_fd_show_options+0x1c0/0x1c0 [ 123.387228] ? lockdep_init_map+0x9/0x10 [ 123.387230] p9_client_create+0xac2/0x16c9 [ 123.387232] ? p9_client_read+0xc60/0xc60 [ 123.387235] ? find_held_lock+0x36/0x1c0 [ 123.387237] ? __lockdep_init_map+0x105/0x590 [ 123.387239] ? kasan_check_write+0x14/0x20 [ 123.387241] ? __init_rwsem+0x1cc/0x2a0 [ 123.387244] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 123.387247] ? rcu_read_lock_sched_held+0x108/0x120 [ 123.387249] ? __kmalloc_track_caller+0x5f5/0x760 [ 123.387251] ? save_stack+0xa9/0xd0 [ 123.387253] ? save_stack+0x43/0xd0 [ 123.387255] ? kasan_kmalloc+0xc4/0xe0 [ 123.387258] ? kmem_cache_alloc_trace+0x152/0x780 [ 123.387260] ? memcpy+0x45/0x50 [ 123.387262] v9fs_session_init+0x21a/0x1a80 [ 123.387264] ? find_held_lock+0x36/0x1c0 [ 123.387267] ? v9fs_show_options+0x7e0/0x7e0 [ 123.387269] ? kasan_check_read+0x11/0x20 [ 123.387271] ? rcu_is_watching+0x8c/0x150 [ 123.387276] ? rcu_pm_notify+0xc0/0xc0 [ 123.387278] ? v9fs_mount+0x61/0x900 [ 123.387281] ? rcu_read_lock_sched_held+0x108/0x120 [ 123.387283] ? kmem_cache_alloc_trace+0x616/0x780 [ 123.387286] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 123.387288] v9fs_mount+0x7c/0x900 [ 123.387290] mount_fs+0xae/0x328 [ 123.387293] vfs_kern_mount.part.34+0xdc/0x4e0 [ 123.387295] ? may_umount+0xb0/0xb0 [ 123.387297] ? _raw_read_unlock+0x22/0x30 [ 123.387299] ? __get_fs_type+0x97/0xc0 [ 123.387301] do_mount+0x581/0x30e0 [ 123.387304] ? do_raw_spin_unlock+0xa7/0x2f0 [ 123.387306] ? copy_mount_string+0x40/0x40 [ 123.387308] ? copy_mount_options+0x5f/0x380 [ 123.387311] ? rcu_read_lock_sched_held+0x108/0x120 [ 123.387314] ? kmem_cache_alloc_trace+0x616/0x780 [ 123.387316] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 123.387319] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 123.387322] ? copy_mount_options+0x285/0x380 [ 123.387324] ksys_mount+0x12d/0x140 [ 123.387326] __x64_sys_mount+0xbe/0x150 [ 123.387328] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 123.387331] do_syscall_64+0x1b9/0x820 [ 123.387333] ? finish_task_switch+0x1d3/0x870 [ 123.387336] ? syscall_return_slowpath+0x5e0/0x5e0 [ 123.387338] ? syscall_return_slowpath+0x31d/0x5e0 [ 123.387341] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 123.387343] ? retint_user+0x18/0x18 [ 123.387346] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 123.387349] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 123.387351] RIP: 0033:0x445d09 [ 123.387352] Code: e8 ec ba 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 ab 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 123.387430] RSP: 002b:00007fce16130da8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 123.387436] RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445d09 [ 123.387439] RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 0000000000000000 [ 123.387442] RBP: 0000000000000000 R08: 0000000020000100 R09: 0000000000000000 [ 123.387446] R10: 0000000000200000 R11: 0000000000000202 R12: 00000000006dbc20 [ 123.387449] R13: 64663d736e617274 R14: 0030656c69662f2e R15: 0000000000000001 [ 124.476492] Shutting down cpus with NMI [ 125.474279] Dumping ftrace buffer: [ 125.477837] (ftrace buffer empty) [ 125.481548] Kernel Offset: disabled [ 125.485210] Rebooting in 86400 seconds..