[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.929419] audit: type=1800 audit(1539006256.062:25): pid=5887 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.954827] audit: type=1800 audit(1539006256.062:26): pid=5887 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.974836] audit: type=1800 audit(1539006256.072:27): pid=5887 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 '10.128.0.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.712349] ------------[ cut here ]------------ [ 59.717164] ODEBUG: free active (active state 1) object type: rcu_head hint: (null) [ 59.726008] WARNING: CPU: 0 PID: 6045 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 59.734738] Kernel panic - not syncing: panic_on_warn set ... [ 59.734738] [ 59.742088] CPU: 0 PID: 6045 Comm: syz-executor423 Not tainted 4.19.0-rc7-next-20181008+ #89 [ 59.750637] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.759969] Call Trace: [ 59.762540] dump_stack+0x244/0x3ab [ 59.766150] ? dump_stack_print_info.cold.2+0x52/0x52 [ 59.771329] panic+0x238/0x4e7 [ 59.774502] ? add_taint.cold.5+0x16/0x16 [ 59.778638] ? __warn.cold.8+0x148/0x1ba [ 59.782674] ? __warn.cold.8+0x117/0x1ba [ 59.786726] ? debug_print_object+0x16a/0x210 [ 59.791199] __warn.cold.8+0x163/0x1ba [ 59.795071] ? debug_print_object+0x16a/0x210 [ 59.799771] report_bug+0x254/0x2d0 [ 59.803401] do_error_trap+0x11b/0x200 [ 59.807281] do_invalid_op+0x36/0x40 [ 59.810991] ? debug_print_object+0x16a/0x210 [ 59.815473] invalid_op+0x14/0x20 [ 59.818907] RIP: 0010:debug_print_object+0x16a/0x210 [ 59.823992] 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 [ 59.842872] RSP: 0018:ffff8801c0726da8 EFLAGS: 00010086 [ 59.848216] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 59.855464] RDX: 0000000000000000 RSI: ffffffff8164d235 RDI: 0000000000000005 [ 59.862708] RBP: ffff8801c0726de8 R08: ffff8801d9508040 R09: ffffed003b5c3eda [ 59.869955] R10: ffffed003b5c3eda R11: ffff8801dae1f6d7 R12: 0000000000000001 [ 59.877202] R13: ffffffff8939a760 R14: 0000000000000000 R15: ffffffff8840fca0 [ 59.884458] ? vprintk_func+0x85/0x181 [ 59.888338] ? debug_print_object+0x16a/0x210 [ 59.892853] debug_check_no_obj_freed+0x3ae/0x58d [ 59.897696] ? debug_object_activate+0x600/0x600 [ 59.902510] ? trace_hardirqs_on+0x310/0x310 [ 59.906914] ? rt_mutex_adjust_prio_chain.cold.15+0x6c/0x6c [ 59.912611] kmem_cache_free+0x202/0x290 [ 59.916656] free_task+0x16e/0x1f0 [ 59.920174] ? arch_release_task_struct+0x10/0x10 [ 59.925000] ? atomic_notifier_call_chain+0xed/0x190 [ 59.930089] __put_task_struct+0x2e6/0x620 [ 59.934429] ? free_task+0x1f0/0x1f0 [ 59.938129] ? free_unref_page+0x960/0x960 [ 59.942341] ? __phys_addr+0xa6/0x120 [ 59.946153] finish_task_switch+0x66c/0x900 [ 59.950456] ? __switch_to_asm+0x40/0x70 [ 59.954496] ? preempt_notifier_register+0x200/0x200 [ 59.959580] ? __switch_to_asm+0x34/0x70 [ 59.963621] ? __switch_to_asm+0x34/0x70 [ 59.967678] ? __switch_to_asm+0x40/0x70 [ 59.971723] ? __switch_to_asm+0x34/0x70 [ 59.975764] ? __switch_to_asm+0x40/0x70 [ 59.979804] ? __switch_to_asm+0x34/0x70 [ 59.983848] ? __switch_to_asm+0x40/0x70 [ 59.987889] ? __switch_to_asm+0x34/0x70 [ 59.991932] ? __switch_to_asm+0x34/0x70 [ 59.995972] ? __switch_to_asm+0x40/0x70 [ 60.000017] ? __switch_to_asm+0x34/0x70 [ 60.004075] ? __switch_to_asm+0x40/0x70 [ 60.008122] ? __switch_to_asm+0x34/0x70 [ 60.012162] ? __switch_to_asm+0x40/0x70 [ 60.016209] __schedule+0x8d7/0x21d0 [ 60.019920] ? __sched_text_start+0x8/0x8 [ 60.024146] ? plist_check_head+0xea/0x150 [ 60.028376] ? plist_check_list+0xa0/0xa0 [ 60.032509] ? plist_add+0x601/0x7a0 [ 60.036288] ? __x2apic_send_IPI_dest+0x5c/0x80 [ 60.040949] ? plist_check_head+0x150/0x150 [ 60.045279] ? x2apic_send_IPI+0x6f/0x95 [ 60.049334] schedule+0xfe/0x460 [ 60.052760] ? lock_downgrade+0x900/0x900 [ 60.056898] ? __schedule+0x21d0/0x21d0 [ 60.060854] ? kasan_check_read+0x11/0x20 [ 60.064983] ? do_raw_spin_unlock+0xa7/0x2f0 [ 60.069400] ? do_raw_spin_trylock+0x270/0x270 [ 60.073976] ? lock_acquire+0x1ed/0x520 [ 60.077951] futex_wait_queue_me+0x3f9/0x840 [ 60.082342] ? refill_pi_state_cache.part.8+0x310/0x310 [ 60.087691] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 60.092774] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.098295] ? get_futex_value_locked+0xcb/0xf0 [ 60.102954] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 60.107956] ? futex_wait_setup+0x266/0x3e0 [ 60.112368] ? futex_wake+0x760/0x760 [ 60.116169] ? futex_wake+0x613/0x760 [ 60.119961] futex_wait+0x45c/0xa50 [ 60.123576] ? futex_wait_setup+0x3e0/0x3e0 [ 60.127879] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 60.133060] ? drop_futex_key_refs.isra.14+0x6d/0xe0 [ 60.138157] ? futex_wake+0x304/0x760 [ 60.141954] ? kasan_check_write+0x14/0x20 [ 60.146205] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 60.151120] ? radix_tree_insert+0x870/0x870 [ 60.155514] ? wait_for_completion+0x8a0/0x8a0 [ 60.160095] do_futex+0x31a/0x26d0 [ 60.163628] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 60.168558] ? lock_downgrade+0x900/0x900 [ 60.172710] ? exit_robust_list+0x280/0x280 [ 60.177025] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 60.182563] ? ucma_put_ctx+0x39/0x60 [ 60.186355] ? ucma_resolve_ip+0x171/0x2a0 [ 60.190573] ? ucma_query+0xb20/0xb20 [ 60.194361] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.199885] ? _copy_from_user+0xdf/0x150 [ 60.204552] ? ucma_query+0xb20/0xb20 [ 60.208341] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.213870] ? ucma_write+0x12b/0x420 [ 60.217727] ? ucma_open+0x3f0/0x3f0 [ 60.221450] ? __vfs_write+0x121/0x9f0 [ 60.225364] ? ucma_open+0x3f0/0x3f0 [ 60.229161] ? kernel_read+0x120/0x120 [ 60.233037] ? apparmor_path_rmdir+0x30/0x30 [ 60.237430] ? apparmor_file_permission+0x24/0x30 [ 60.242253] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.247793] ? security_file_permission+0x1c2/0x220 [ 60.252809] ? rw_verify_area+0x118/0x360 [ 60.256944] __x64_sys_futex+0x472/0x6a0 [ 60.260995] ? do_futex+0x26d0/0x26d0 [ 60.264791] ? trace_hardirqs_on+0xbd/0x310 [ 60.269120] ? __ia32_sys_read+0xb0/0xb0 [ 60.273182] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 60.278527] ? trace_hardirqs_off_caller+0x300/0x300 [ 60.283609] ? trace_hardirqs_off+0xb8/0x310 [ 60.288021] do_syscall_64+0x1b9/0x820 [ 60.292022] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 60.297384] ? syscall_return_slowpath+0x5e0/0x5e0 [ 60.302300] ? trace_hardirqs_on_caller+0x310/0x310 [ 60.307439] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 60.312439] ? __bpf_trace_signal_deliver+0x40/0x40 [ 60.317454] ? __switch_to_asm+0x40/0x70 [ 60.321512] ? __switch_to_asm+0x34/0x70 [ 60.325604] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 60.330452] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 60.335669] RIP: 0033:0x446669 [ 60.338863] 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 [ 60.357754] RSP: 002b:00007f88eaaf9da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 60.365491] RAX: ffffffffffffffda RBX: 00000000006dbc68 RCX: 0000000000446669 [ 60.372756] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc68 [ 60.380007] RBP: 00000000006dbc60 R08: 0000000000000000 R09: 0000000000000000 [ 60.387369] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c [ 60.394623] R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 00000000006dbd4c [ 60.402904] Kernel Offset: disabled [ 60.406528] Rebooting in 86400 seconds..