[....] 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. [ 26.611327] kauditd_printk_skb: 7 callbacks suppressed [ 26.611339] audit: type=1800 audit(1537921493.941:29): pid=5211 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 [ 26.638231] audit: type=1800 audit(1537921493.941:30): pid=5211 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 '10.128.0.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.956102] kasan: CONFIG_KASAN_INLINE enabled [ 38.960898] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.968370] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.974710] CPU: 1 PID: 5367 Comm: syz-executor277 Not tainted 4.19.0-rc5+ #254 [ 38.982140] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.991586] RIP: 0010:rb_erase+0x306/0x3710 [ 38.995899] 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 [ 39.014784] RSP: 0018:ffff8801baa3e918 EFLAGS: 00010202 [ 39.020134] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.027385] RDX: 1ffff10037547d2b RSI: ffffffff8b5a08a0 RDI: 0000000000000008 [ 39.034640] RBP: ffff8801baa3f320 R08: dffffc0000000000 R09: fffffbfff135d5c8 [ 39.041894] R10: fffffbfff135d5c8 R11: ffffffff89aeae43 R12: ffff8801b6fb21f0 [ 39.049145] R13: dffffc0000000000 R14: ffff8801baa3f2f8 R15: ffff8801baa3f438 [ 39.056439] FS: 00000000021c6880(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 [ 39.064655] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.070563] CR2: 0000000020000180 CR3: 00000001d8c65000 CR4: 00000000001406e0 [ 39.077821] Call Trace: [ 39.080397] ? lockdep_on+0x50/0x50 [ 39.084030] ? rb_insert_color+0x1460/0x1460 [ 39.088444] ? noop_count+0x40/0x40 [ 39.092065] ? lock_pin_lock+0x350/0x350 [ 39.096111] ? noop_count+0x40/0x40 [ 39.099721] ? kasan_check_read+0x11/0x20 [ 39.103864] ? noop_count+0x40/0x40 [ 39.107477] ? lock_pin_lock+0x350/0x350 [ 39.111542] ? mark_held_locks+0x130/0x130 [ 39.115772] ? check_usage_forwards+0x3e0/0x3e0 [ 39.120440] ? __bfs+0x385/0x7a0 [ 39.123785] ? noop_count+0x40/0x40 [ 39.127394] ? check_usage+0x1a9/0x790 [ 39.131300] ? lock_pin_lock+0x350/0x350 [ 39.135403] ? check_usage_forwards+0x3e0/0x3e0 [ 39.140062] ? __bfs+0x385/0x7a0 [ 39.143416] ? __lock_acquire+0x7ec/0x4ec0 [ 39.147642] ? lockdep_on+0x50/0x50 [ 39.151261] ? lock_pin_lock+0x350/0x350 [ 39.155314] ? mark_held_locks+0x130/0x130 [ 39.159537] ? kasan_check_read+0x11/0x20 [ 39.163668] ? __lock_acquire+0x2881/0x4ec0 [ 39.167983] ? mark_held_locks+0x130/0x130 [ 39.172199] ? print_usage_bug+0xc0/0xc0 [ 39.176247] ? _raw_spin_unlock+0x2c/0x50 [ 39.180394] ? graph_lock+0x170/0x170 [ 39.184182] ? ext4_exit_mballoc+0xc0/0xc0 [ 39.188419] ? __lock_acquire+0x7ec/0x4ec0 [ 39.192751] ? find_held_lock+0x36/0x1c0 [ 39.196798] ? mark_held_locks+0x130/0x130 [ 39.201022] ? lock_downgrade+0x900/0x900 [ 39.205161] ? ext4_es_scan+0x960/0x960 [ 39.209226] ? lock_release+0x970/0x970 [ 39.213311] ? do_raw_write_trylock+0x1c0/0x1c0 [ 39.218081] ? kasan_check_write+0x14/0x20 [ 39.222299] ? lock_acquire+0x1ed/0x520 [ 39.226257] ? integrity_inode_free+0x77/0x320 [ 39.230938] ? ext4_es_remove_extent+0x151/0x500 [ 39.235684] ? lock_release+0x970/0x970 [ 39.239645] ? kasan_check_write+0x14/0x20 [ 39.243972] ? do_raw_write_lock+0xbd/0x1b0 [ 39.248288] integrity_inode_free+0x12f/0x320 [ 39.252771] security_inode_free+0x19/0x90 [ 39.256992] __destroy_inode+0x328/0x820 [ 39.261049] ? generic_update_time+0x450/0x450 [ 39.265709] ? evict+0x5d8/0x980 [ 39.269200] ? lock_downgrade+0x900/0x900 [ 39.273333] ? __inode_wait_for_writeback+0x2cf/0x380 [ 39.278619] destroy_inode+0xda/0x200 [ 39.282486] ? __destroy_inode+0x820/0x820 [ 39.286725] ? kasan_check_write+0x14/0x20 [ 39.290948] ? do_raw_spin_lock+0xc1/0x200 [ 39.295195] evict+0x5e0/0x980 [ 39.298375] ? destroy_inode+0x200/0x200 [ 39.302513] ? iput+0x671/0xa90 [ 39.305793] ? lock_downgrade+0x900/0x900 [ 39.309935] ? kasan_check_read+0x11/0x20 [ 39.314077] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 39.318651] ? lock_downgrade+0x900/0x900 [ 39.322859] iput+0x679/0xa90 [ 39.325965] ? inode_add_lru+0x2a0/0x2a0 [ 39.330014] ? up_write+0x7b/0x220 [ 39.333552] ? up_read+0x110/0x110 [ 39.337086] ? up_read+0x110/0x110 [ 39.340614] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.346234] ? check_preemption_disabled+0x48/0x200 [ 39.351241] ext4_ioctl+0x236f/0x4210 [ 39.355093] ? ext4_ioctl_group_add+0x560/0x560 [ 39.359755] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 39.365538] ? kasan_check_read+0x11/0x20 [ 39.369673] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.374931] ? rcu_bh_qs+0xc0/0xc0 [ 39.378517] ? rcu_bh_qs+0xc0/0xc0 [ 39.382045] ? unwind_dump+0x190/0x190 [ 39.385924] ? is_bpf_text_address+0xd3/0x170 [ 39.390428] ? kernel_text_address+0x79/0xf0 [ 39.394827] ? __kernel_text_address+0xd/0x40 [ 39.399352] ? unwind_get_return_address+0x61/0xa0 [ 39.404375] ? __save_stack_trace+0x8d/0xf0 [ 39.408700] ? save_stack+0xa9/0xd0 [ 39.412306] ? save_stack+0x43/0xd0 [ 39.415914] ? __kasan_slab_free+0x102/0x150 [ 39.420299] ? kasan_slab_free+0xe/0x10 [ 39.424327] ? kmem_cache_free+0x83/0x290 [ 39.428524] ? putname+0xf2/0x130 [ 39.431971] ? do_sys_open+0x54d/0x700 [ 39.435849] ? __x64_sys_open+0x7e/0xc0 [ 39.439814] ? do_syscall_64+0x1b9/0x820 [ 39.444019] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.449379] ? trace_hardirqs_off+0xb8/0x310 [ 39.453784] ? kasan_check_read+0x11/0x20 [ 39.457928] ? do_raw_spin_unlock+0xa7/0x2f0 [ 39.462317] ? trace_hardirqs_on+0x310/0x310 [ 39.466712] ? kasan_check_write+0x14/0x20 [ 39.471060] ? trace_hardirqs_off+0xb8/0x310 [ 39.475453] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.480982] ? check_preemption_disabled+0x48/0x200 [ 39.485990] ? ext4_ioctl_group_add+0x560/0x560 [ 39.490649] do_vfs_ioctl+0x1de/0x1720 [ 39.494549] ? rcu_lockdep_current_cpu_online+0x1f0/0x2d0 [ 39.500119] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.505388] ? ioctl_preallocate+0x300/0x300 [ 39.509785] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.515311] ? __fget_light+0x2e9/0x430 [ 39.519275] ? fget_raw+0x20/0x20 [ 39.522715] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.527719] ? kmem_cache_free+0x24f/0x290 [ 39.531946] ? putname+0xf7/0x130 [ 39.535388] ? do_syscall_64+0x9a/0x820 [ 39.539345] ? do_syscall_64+0x9a/0x820 [ 39.543363] ? lockdep_hardirqs_on+0x421/0x5c0 [ 39.547959] ? security_file_ioctl+0x94/0xc0 [ 39.552358] ksys_ioctl+0xa9/0xd0 [ 39.555813] __x64_sys_ioctl+0x73/0xb0 [ 39.559707] do_syscall_64+0x1b9/0x820 [ 39.563585] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.568932] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.573845] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.578743] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.583747] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.588747] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.593749] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.598578] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.603762] RIP: 0033:0x440029 [ 39.606946] 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 [ 39.625839] RSP: 002b:00007ffcad52e1e8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 39.633542] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 39.640805] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004 [ 39.648070] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.655318] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0 [ 39.662692] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 39.669949] Modules linked in: [ 39.673278] ---[ end trace fb280e033f46d5a5 ]--- [ 39.678402] RIP: 0010:rb_erase+0x306/0x3710 [ 39.682745] 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 [ 39.701668] RSP: 0018:ffff8801baa3e918 EFLAGS: 00010202 [ 39.707050] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.714310] RDX: 1ffff10037547d2b RSI: ffffffff8b5a08a0 RDI: 0000000000000008 [ 39.721722] RBP: ffff8801baa3f320 R08: dffffc0000000000 R09: fffffbfff135d5c8 [ 39.729186] R10: fffffbfff135d5c8 R11: ffffffff89aeae43 R12: ffff8801b6fb21f0 [ 39.736486] R13: dffffc0000000000 R14: ffff8801baa3f2f8 R15: ffff8801baa3f438 [ 39.743761] FS: 00000000021c6880(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 [ 39.752017] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.757916] CR2: 0000000020000180 CR3: 00000001d8c65000 CR4: 00000000001406e0 [ 39.765174] Kernel panic - not syncing: Fatal exception [ 39.771546] Kernel Offset: disabled [ 39.775169] Rebooting in 86400 seconds..