[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.581206] audit: type=1800 audit(1538998207.401:25): pid=5873 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 34.601320] audit: type=1800 audit(1538998207.401:26): pid=5873 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 34.691441] audit: type=1800 audit(1538998207.511:27): pid=5873 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 47.868330] ------------[ cut here ]------------ [ 47.873262] ODEBUG: free active (active state 1) object type: rcu_head hint: (null) [ 47.882160] WARNING: CPU: 0 PID: 6048 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 47.890891] Kernel panic - not syncing: panic_on_warn set ... [ 47.890891] [ 47.898236] CPU: 0 PID: 6048 Comm: syz-executor022 Not tainted 4.19.0-rc7-next-20181008+ #89 [ 47.906959] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.916320] Call Trace: [ 47.918896] dump_stack+0x244/0x3ab [ 47.922506] ? dump_stack_print_info.cold.2+0x52/0x52 [ 47.927999] panic+0x238/0x4e7 [ 47.931338] ? add_taint.cold.5+0x16/0x16 [ 47.935472] ? __warn.cold.8+0x148/0x1ba [ 47.939688] ? __warn.cold.8+0x117/0x1ba [ 47.943753] ? debug_print_object+0x16a/0x210 [ 47.948243] __warn.cold.8+0x163/0x1ba [ 47.952121] ? debug_print_object+0x16a/0x210 [ 47.956601] report_bug+0x254/0x2d0 [ 47.960213] do_error_trap+0x11b/0x200 [ 47.964251] do_invalid_op+0x36/0x40 [ 47.967964] ? debug_print_object+0x16a/0x210 [ 47.972457] invalid_op+0x14/0x20 [ 47.975895] RIP: 0010:debug_print_object+0x16a/0x210 [ 47.981001] Code: 41 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd 60 02 41 88 4c 89 fe 48 c7 c7 00 f8 40 88 e8 36 2f b4 fd <0f> 0b 83 05 a9 f4 5e 06 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f [ 48.000004] RSP: 0018:ffff8801d8c3eda8 EFLAGS: 00010086 [ 48.005577] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 48.012838] RDX: 0000000000000000 RSI: ffffffff8164d235 RDI: 0000000000000005 [ 48.020095] RBP: ffff8801d8c3ede8 R08: ffff8801d70aa280 R09: ffffed003b5c3eda [ 48.027466] R10: ffffed003b5c3eda R11: ffff8801dae1f6d7 R12: 0000000000000001 [ 48.034738] R13: ffffffff8939a760 R14: 0000000000000000 R15: ffffffff8840fca0 [ 48.042012] ? vprintk_func+0x85/0x181 [ 48.046062] ? debug_print_object+0x16a/0x210 [ 48.050780] debug_check_no_obj_freed+0x3ae/0x58d [ 48.055617] ? debug_object_activate+0x600/0x600 [ 48.060359] ? trace_hardirqs_on+0x310/0x310 [ 48.064750] ? rt_mutex_adjust_prio_chain.cold.15+0x6c/0x6c [ 48.070455] kmem_cache_free+0x202/0x290 [ 48.074644] free_task+0x16e/0x1f0 [ 48.078280] ? arch_release_task_struct+0x10/0x10 [ 48.083122] ? atomic_notifier_call_chain+0xed/0x190 [ 48.088421] __put_task_struct+0x2e6/0x620 [ 48.092649] ? free_task+0x1f0/0x1f0 [ 48.096351] ? free_unref_page+0x960/0x960 [ 48.100581] ? __phys_addr+0xa6/0x120 [ 48.104373] finish_task_switch+0x66c/0x900 [ 48.108865] ? __switch_to_asm+0x40/0x70 [ 48.112953] ? preempt_notifier_register+0x200/0x200 [ 48.118047] ? __switch_to_asm+0x34/0x70 [ 48.122095] ? __switch_to_asm+0x34/0x70 [ 48.126155] ? __switch_to_asm+0x40/0x70 [ 48.130198] ? __switch_to_asm+0x34/0x70 [ 48.134239] ? __switch_to_asm+0x40/0x70 [ 48.138280] ? __switch_to_asm+0x34/0x70 [ 48.142320] ? __switch_to_asm+0x40/0x70 [ 48.146476] ? __switch_to_asm+0x34/0x70 [ 48.150539] ? __switch_to_asm+0x34/0x70 [ 48.154586] ? __switch_to_asm+0x40/0x70 [ 48.158634] ? __switch_to_asm+0x34/0x70 [ 48.162698] ? __switch_to_asm+0x40/0x70 [ 48.166825] ? __switch_to_asm+0x34/0x70 [ 48.170884] ? __switch_to_asm+0x40/0x70 [ 48.174933] __schedule+0x8d7/0x21d0 [ 48.178634] ? __sched_text_start+0x8/0x8 [ 48.182788] ? plist_check_head+0xea/0x150 [ 48.187154] ? plist_check_list+0xa0/0xa0 [ 48.191418] ? plist_add+0x601/0x7a0 [ 48.195125] ? __x2apic_send_IPI_dest+0x5c/0x80 [ 48.199790] ? plist_check_head+0x150/0x150 [ 48.204113] ? x2apic_send_IPI+0x6f/0x95 [ 48.208170] schedule+0xfe/0x460 [ 48.211529] ? lock_downgrade+0x900/0x900 [ 48.215658] ? __schedule+0x21d0/0x21d0 [ 48.219621] ? kasan_check_read+0x11/0x20 [ 48.223832] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.228420] ? do_raw_spin_trylock+0x270/0x270 [ 48.233003] ? lock_acquire+0x1ed/0x520 [ 48.236987] futex_wait_queue_me+0x3f9/0x840 [ 48.241386] ? refill_pi_state_cache.part.8+0x310/0x310 [ 48.246739] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 48.251837] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.257359] ? get_futex_value_locked+0xcb/0xf0 [ 48.262125] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.267141] ? futex_wait_setup+0x266/0x3e0 [ 48.271602] ? futex_wake+0x760/0x760 [ 48.275408] ? futex_wake+0x613/0x760 [ 48.279353] futex_wait+0x45c/0xa50 [ 48.282977] ? futex_wait_setup+0x3e0/0x3e0 [ 48.287720] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 48.293072] ? drop_futex_key_refs.isra.14+0x6d/0xe0 [ 48.298234] ? futex_wake+0x304/0x760 [ 48.302038] ? kasan_check_write+0x14/0x20 [ 48.306261] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 48.311175] ? radix_tree_insert+0x870/0x870 [ 48.315660] ? wait_for_completion+0x8a0/0x8a0 [ 48.320234] do_futex+0x31a/0x26d0 [ 48.323772] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 48.328844] ? lock_downgrade+0x900/0x900 [ 48.332983] ? exit_robust_list+0x280/0x280 [ 48.337443] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.342973] ? ucma_put_ctx+0x39/0x60 [ 48.346766] ? ucma_resolve_ip+0x171/0x2a0 [ 48.350991] ? ucma_query+0xb20/0xb20 [ 48.354785] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.360306] ? _copy_from_user+0xdf/0x150 [ 48.364436] ? ucma_query+0xb20/0xb20 [ 48.368416] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.374222] ? ucma_write+0x12b/0x420 [ 48.378237] ? ucma_open+0x3f0/0x3f0 [ 48.381957] ? __vfs_write+0x121/0x9f0 [ 48.385831] ? ucma_open+0x3f0/0x3f0 [ 48.389706] ? kernel_read+0x120/0x120 [ 48.393588] ? apparmor_path_rmdir+0x30/0x30 [ 48.397983] ? fsnotify_first_mark+0x350/0x350 [ 48.402553] ? apparmor_file_permission+0x24/0x30 [ 48.407380] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.412920] ? security_file_permission+0x1c2/0x220 [ 48.417942] ? rw_verify_area+0x118/0x360 [ 48.422075] __x64_sys_futex+0x472/0x6a0 [ 48.426115] ? do_futex+0x26d0/0x26d0 [ 48.429894] ? trace_hardirqs_on+0xbd/0x310 [ 48.434211] ? __ia32_sys_read+0xb0/0xb0 [ 48.438435] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.443802] ? trace_hardirqs_off_caller+0x300/0x300 [ 48.448979] ? trace_hardirqs_off+0xb8/0x310 [ 48.453383] do_syscall_64+0x1b9/0x820 [ 48.457415] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 48.462774] ? syscall_return_slowpath+0x5e0/0x5e0 [ 48.467873] ? trace_hardirqs_on_caller+0x310/0x310 [ 48.472908] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 48.477917] ? __bpf_trace_signal_deliver+0x40/0x40 [ 48.483054] ? __switch_to_asm+0x40/0x70 [ 48.487096] ? __switch_to_asm+0x34/0x70 [ 48.491144] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.496172] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.501349] RIP: 0033:0x446549 [ 48.504528] Code: e8 2c b3 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 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 48.523505] RSP: 002b:00007f3a998f5da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 48.531282] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446549 [ 48.538532] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc38 [ 48.545782] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 48.553032] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 48.560294] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 00000000006dbd2c [ 48.568808] Kernel Offset: disabled [ 48.572450] Rebooting in 86400 seconds..