[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 26.321176] kauditd_printk_skb: 7 callbacks suppressed [ 26.321188] audit: type=1800 audit(1538348238.876:29): pid=5234 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 26.347853] audit: type=1800 audit(1538348238.886:30): pid=5234 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.170739] kasan: CONFIG_KASAN_INLINE enabled [ 38.175491] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.182847] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.189094] CPU: 0 PID: 5389 Comm: syz-executor645 Not tainted 4.19.0-rc5+ #238 [ 38.196523] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.205869] RIP: 0010:rb_erase+0x306/0x3710 [ 38.210175] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 38.229063] RSP: 0018:ffff8801d8a9e918 EFLAGS: 00010202 [ 38.234420] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.241735] RDX: 1ffff1003b153d2b RSI: ffffffff8afc08a0 RDI: 0000000000000008 [ 38.248993] RBP: ffff8801d8a9f320 R08: dffffc0000000000 R09: fffffbfff12d6a90 [ 38.256255] R10: fffffbfff12d6a90 R11: ffffffff896b5483 R12: ffff8801b73921f0 [ 38.263518] R13: dffffc0000000000 R14: ffff8801d8a9f2f8 R15: ffff8801d8a9f438 [ 38.270784] FS: 0000000001814880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 38.279005] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.284875] CR2: 0000000020000080 CR3: 00000001bac09000 CR4: 00000000001406f0 [ 38.292140] Call Trace: [ 38.294727] ? lockdep_on+0x50/0x50 [ 38.298365] ? rb_insert_color+0x1460/0x1460 [ 38.302767] ? noop_count+0x40/0x40 [ 38.306388] ? lock_pin_lock+0x350/0x350 [ 38.310440] ? noop_count+0x40/0x40 [ 38.314060] ? kasan_check_read+0x11/0x20 [ 38.318206] ? noop_count+0x40/0x40 [ 38.321821] ? noop_count+0x40/0x40 [ 38.325456] ? lock_pin_lock+0x350/0x350 [ 38.329511] ? mark_held_locks+0x130/0x130 [ 38.333743] ? check_usage_forwards+0x3e0/0x3e0 [ 38.338401] ? __bfs+0x385/0x7a0 [ 38.341753] ? noop_count+0x40/0x40 [ 38.345367] ? check_usage+0x1a9/0x790 [ 38.349257] ? lock_pin_lock+0x350/0x350 [ 38.353309] ? check_usage_forwards+0x3e0/0x3e0 [ 38.357994] ? __bfs+0x385/0x7a0 [ 38.361380] ? __lock_acquire+0x7ec/0x4ec0 [ 38.365629] ? lockdep_on+0x50/0x50 [ 38.369272] ? lock_pin_lock+0x350/0x350 [ 38.373362] ? mark_held_locks+0x130/0x130 [ 38.377599] ? kasan_check_read+0x11/0x20 [ 38.381772] ? __lock_acquire+0x2881/0x4ec0 [ 38.386100] ? mark_held_locks+0x130/0x130 [ 38.390335] ? print_usage_bug+0xc0/0xc0 [ 38.394432] ? _raw_spin_unlock+0x2c/0x50 [ 38.398638] ? graph_lock+0x170/0x170 [ 38.402462] ? ext4_exit_mballoc+0xc0/0xc0 [ 38.406701] ? __lock_acquire+0x7ec/0x4ec0 [ 38.410933] ? find_held_lock+0x36/0x1c0 [ 38.415000] ? mark_held_locks+0x130/0x130 [ 38.419249] ? lock_downgrade+0x900/0x900 [ 38.423413] ? ext4_es_scan+0x960/0x960 [ 38.427382] ? do_raw_write_trylock+0x1c0/0x1c0 [ 38.432038] ? kasan_check_write+0x14/0x20 [ 38.436259] ? lock_acquire+0x1ed/0x520 [ 38.440219] ? integrity_inode_free+0x77/0x320 [ 38.444787] ? ext4_es_remove_extent+0x151/0x500 [ 38.449526] ? lock_release+0x970/0x970 [ 38.453488] ? kasan_check_write+0x14/0x20 [ 38.457709] ? do_raw_write_lock+0xbd/0x1b0 [ 38.462021] integrity_inode_free+0x12f/0x320 [ 38.466503] security_inode_free+0x19/0x90 [ 38.470723] __destroy_inode+0x328/0x820 [ 38.474769] ? generic_update_time+0x450/0x450 [ 38.479334] ? evict+0x5d8/0x980 [ 38.482688] ? lock_downgrade+0x900/0x900 [ 38.486826] ? __inode_wait_for_writeback+0x2cf/0x380 [ 38.492006] destroy_inode+0xda/0x200 [ 38.495791] ? __destroy_inode+0x820/0x820 [ 38.500008] ? kasan_check_write+0x14/0x20 [ 38.504238] ? do_raw_spin_lock+0xc1/0x200 [ 38.508458] evict+0x5e0/0x980 [ 38.511638] ? destroy_inode+0x200/0x200 [ 38.515684] ? iput+0x671/0xa90 [ 38.518948] ? lock_downgrade+0x900/0x900 [ 38.523084] ? kasan_check_read+0x11/0x20 [ 38.527220] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 38.531788] ? lock_downgrade+0x900/0x900 [ 38.535949] iput+0x679/0xa90 [ 38.539050] ? inode_add_lru+0x2a0/0x2a0 [ 38.543092] ? up_write+0x7b/0x220 [ 38.546615] ? up_read+0x110/0x110 [ 38.550141] ? up_read+0x110/0x110 [ 38.553668] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.559192] ? check_preemption_disabled+0x48/0x200 [ 38.564196] ext4_ioctl+0x236f/0x4210 [ 38.567985] ? is_bpf_text_address+0xac/0x170 [ 38.572469] ? ext4_ioctl_group_add+0x560/0x560 [ 38.577128] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 38.582935] ? kasan_check_read+0x11/0x20 [ 38.587083] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.592343] ? rcu_bh_qs+0xc0/0xc0 [ 38.595869] ? rcu_bh_qs+0xc0/0xc0 [ 38.599396] ? unwind_dump+0x190/0x190 [ 38.603271] ? is_bpf_text_address+0xd3/0x170 [ 38.607751] ? kernel_text_address+0x79/0xf0 [ 38.612146] ? __kernel_text_address+0xd/0x40 [ 38.616628] ? unwind_get_return_address+0x61/0xa0 [ 38.621561] ? __save_stack_trace+0x8d/0xf0 [ 38.625872] ? save_stack+0xa9/0xd0 [ 38.629488] ? save_stack+0x43/0xd0 [ 38.633099] ? __kasan_slab_free+0x102/0x150 [ 38.637493] ? kasan_slab_free+0xe/0x10 [ 38.641452] ? kmem_cache_free+0x83/0x290 [ 38.645603] ? putname+0xf2/0x130 [ 38.649040] ? do_sys_open+0x54d/0x700 [ 38.652920] ? __x64_sys_openat+0x9d/0x100 [ 38.657147] ? do_syscall_64+0x1b9/0x820 [ 38.661209] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.666580] ? trace_hardirqs_off+0xb8/0x310 [ 38.670979] ? kasan_check_read+0x11/0x20 [ 38.675114] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.679507] ? trace_hardirqs_on+0x310/0x310 [ 38.684212] ? kasan_check_write+0x14/0x20 [ 38.688436] ? trace_hardirqs_off+0xb8/0x310 [ 38.692849] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.698373] ? check_preemption_disabled+0x48/0x200 [ 38.703375] ? check_preemption_disabled+0x48/0x200 [ 38.708384] ? ext4_ioctl_group_add+0x560/0x560 [ 38.713049] do_vfs_ioctl+0x1de/0x1720 [ 38.716939] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.722220] ? ioctl_preallocate+0x300/0x300 [ 38.726624] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.732158] ? __fget_light+0x2e9/0x430 [ 38.736128] ? fget_raw+0x20/0x20 [ 38.739571] ? putname+0xf2/0x130 [ 38.743017] ? rcu_read_lock_sched_held+0x108/0x120 [ 38.748047] ? kmem_cache_free+0x24f/0x290 [ 38.752297] ? putname+0xf7/0x130 [ 38.755771] ? do_syscall_64+0x9a/0x820 [ 38.759749] ? do_syscall_64+0x9a/0x820 [ 38.763728] ? lockdep_hardirqs_on+0x421/0x5c0 [ 38.768305] ? security_file_ioctl+0x94/0xc0 [ 38.772699] ksys_ioctl+0xa9/0xd0 [ 38.776140] __x64_sys_ioctl+0x73/0xb0 [ 38.780014] do_syscall_64+0x1b9/0x820 [ 38.783887] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.789243] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.794160] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.798996] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.803996] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.809007] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.814015] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.818868] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.824048] RIP: 0033:0x440019 [ 38.827237] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 38.846140] RSP: 002b:00007ffccaf37988 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 38.853840] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440019 [ 38.861102] RDX: 0000000000440019 RSI: 0000000000006611 RDI: 0000000000000003 [ 38.868362] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 38.875617] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018a0 [ 38.882875] R13: 0000000000401930 R14: 0000000000000000 R15: 0000000000000000 [ 38.890142] Modules linked in: [ 38.893458] ---[ end trace e091fc55d0ad4aaf ]--- [ 38.898307] RIP: 0010:rb_erase+0x306/0x3710 [ 38.902636] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 38.921642] RSP: 0018:ffff8801d8a9e918 EFLAGS: 00010202 [ 38.927057] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.934521] RDX: 1ffff1003b153d2b RSI: ffffffff8afc08a0 RDI: 0000000000000008 [ 38.941801] RBP: ffff8801d8a9f320 R08: dffffc0000000000 R09: fffffbfff12d6a90 [ 38.949116] R10: fffffbfff12d6a90 R11: ffffffff896b5483 R12: ffff8801b73921f0 [ 38.956431] R13: dffffc0000000000 R14: ffff8801d8a9f2f8 R15: ffff8801d8a9f438 [ 38.963706] FS: 0000000001814880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 38.971988] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.977907] CR2: 0000000020000080 CR3: 00000001bac09000 CR4: 00000000001406f0 [ 38.985228] Kernel panic - not syncing: Fatal exception [ 38.991527] Kernel Offset: disabled [ 38.995157] Rebooting in 86400 seconds..