[....] 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. [ 26.204801] kauditd_printk_skb: 7 callbacks suppressed [ 26.204820] audit: type=1800 audit(1539732049.072:29): pid=5191 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 [ 26.231722] audit: type=1800 audit(1539732049.082:30): pid=5191 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 '10.128.0.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.812877] kasan: CONFIG_KASAN_INLINE enabled [ 44.817609] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 44.824961] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 44.831175] CPU: 0 PID: 5347 Comm: syz-executor645 Not tainted 4.19.0-rc8+ #286 [ 44.838598] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.847959] RIP: 0010:rb_erase+0x306/0x3710 [ 44.852265] 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 [ 44.871153] RSP: 0018:ffff8801bb2fe918 EFLAGS: 00010202 [ 44.876503] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 44.883753] RDX: 1ffff1003765fd2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 44.891005] RBP: ffff8801bb2ff320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 44.898280] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6f11970 [ 44.905530] R13: dffffc0000000000 R14: ffff8801bb2ff2f8 R15: ffff8801bb2ff438 [ 44.912782] FS: 00000000018db880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 44.920988] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.926851] CR2: 0000000020000080 CR3: 00000001d84fc000 CR4: 00000000001406f0 [ 44.934106] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.941358] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.948605] Call Trace: [ 44.951177] ? lockdep_on+0x50/0x50 [ 44.954787] ? rb_insert_color+0x1460/0x1460 [ 44.959180] ? lock_downgrade+0x900/0x900 [ 44.963310] ? noop_count+0x40/0x40 [ 44.966919] ? lock_pin_lock+0x350/0x350 [ 44.970974] ? rcu_bh_qs+0xc0/0xc0 [ 44.974496] ? unwind_dump+0x190/0x190 [ 44.978374] ? kasan_check_read+0x11/0x20 [ 44.982509] ? noop_count+0x40/0x40 [ 44.986118] ? lock_pin_lock+0x350/0x350 [ 44.990161] ? mark_held_locks+0x130/0x130 [ 44.994393] ? check_usage_forwards+0x3e0/0x3e0 [ 44.999049] ? __bfs+0x385/0x7a0 [ 45.002400] ? check_usage+0x1a9/0x790 [ 45.006269] ? lock_pin_lock+0x350/0x350 [ 45.010314] ? check_usage_forwards+0x3e0/0x3e0 [ 45.014961] ? __bfs+0x385/0x7a0 [ 45.018309] ? lockdep_on+0x50/0x50 [ 45.021918] ? lock_pin_lock+0x350/0x350 [ 45.025965] ? mark_held_locks+0x130/0x130 [ 45.030181] ? kasan_check_read+0x11/0x20 [ 45.034311] ? __lock_acquire+0x2881/0x4ec0 [ 45.038617] ? mark_held_locks+0x130/0x130 [ 45.042830] ? print_usage_bug+0xc0/0xc0 [ 45.046872] ? _raw_spin_unlock+0x2c/0x50 [ 45.051005] ? graph_lock+0x170/0x170 [ 45.054794] ? ext4_exit_mballoc+0xc0/0xc0 [ 45.059014] ? __lock_acquire+0x7ec/0x4ec0 [ 45.063237] ? find_held_lock+0x36/0x1c0 [ 45.067280] ? mark_held_locks+0x130/0x130 [ 45.071563] ? lock_downgrade+0x900/0x900 [ 45.075695] ? ext4_es_scan+0x960/0x960 [ 45.079649] ? lock_release+0x970/0x970 [ 45.083607] ? do_raw_write_trylock+0x1c0/0x1c0 [ 45.088257] ? kasan_check_write+0x14/0x20 [ 45.092474] ? lock_acquire+0x1ed/0x520 [ 45.096427] ? integrity_inode_free+0x77/0x320 [ 45.100992] ? ext4_es_remove_extent+0x151/0x500 [ 45.105730] ? lock_release+0x970/0x970 [ 45.109686] ? kasan_check_write+0x14/0x20 [ 45.113904] ? do_raw_write_lock+0xbd/0x1b0 [ 45.118209] integrity_inode_free+0x12f/0x320 [ 45.122685] security_inode_free+0x19/0x90 [ 45.126917] __destroy_inode+0x328/0x820 [ 45.130979] ? generic_update_time+0x450/0x450 [ 45.135552] ? evict+0x5d8/0x980 [ 45.138903] ? lock_downgrade+0x900/0x900 [ 45.143037] ? __inode_wait_for_writeback+0x2cf/0x380 [ 45.148211] destroy_inode+0xda/0x200 [ 45.151991] ? __destroy_inode+0x820/0x820 [ 45.156208] ? kasan_check_write+0x14/0x20 [ 45.160427] ? do_raw_spin_lock+0xc1/0x200 [ 45.164643] evict+0x5e0/0x980 [ 45.167818] ? destroy_inode+0x200/0x200 [ 45.171857] ? iput+0x671/0xa90 [ 45.175119] ? lock_downgrade+0x900/0x900 [ 45.179263] ? kasan_check_read+0x11/0x20 [ 45.183395] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 45.187961] ? lock_downgrade+0x900/0x900 [ 45.192093] iput+0x679/0xa90 [ 45.195180] ? inode_add_lru+0x2a0/0x2a0 [ 45.199224] ? up_write+0x7b/0x220 [ 45.202743] ? up_read+0x110/0x110 [ 45.206262] ? up_read+0x110/0x110 [ 45.209800] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.215320] ? check_preemption_disabled+0x48/0x200 [ 45.220323] ext4_ioctl+0x236f/0x4210 [ 45.224106] ? is_bpf_text_address+0xac/0x170 [ 45.228586] ? ext4_ioctl_group_add+0x560/0x560 [ 45.233238] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 45.239017] ? kasan_check_read+0x11/0x20 [ 45.243152] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 45.248409] ? rcu_bh_qs+0xc0/0xc0 [ 45.251927] ? rcu_bh_qs+0xc0/0xc0 [ 45.255445] ? unwind_dump+0x190/0x190 [ 45.259318] ? is_bpf_text_address+0xd3/0x170 [ 45.263794] ? kernel_text_address+0x79/0xf0 [ 45.268182] ? __kernel_text_address+0xd/0x40 [ 45.272656] ? unwind_get_return_address+0x61/0xa0 [ 45.277568] ? __save_stack_trace+0x8d/0xf0 [ 45.281874] ? save_stack+0xa9/0xd0 [ 45.285480] ? save_stack+0x43/0xd0 [ 45.289085] ? __kasan_slab_free+0x102/0x150 [ 45.293486] ? kasan_slab_free+0xe/0x10 [ 45.297440] ? kmem_cache_free+0x83/0x290 [ 45.301569] ? putname+0xf2/0x130 [ 45.304999] ? do_sys_open+0x54d/0x700 [ 45.308869] ? __x64_sys_openat+0x9d/0x100 [ 45.313087] ? do_syscall_64+0x1b9/0x820 [ 45.317131] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.322477] ? trace_hardirqs_off+0xb8/0x310 [ 45.326863] ? kasan_check_read+0x11/0x20 [ 45.331012] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.335409] ? trace_hardirqs_on+0x310/0x310 [ 45.339799] ? kasan_check_write+0x14/0x20 [ 45.344015] ? trace_hardirqs_off+0xb8/0x310 [ 45.348410] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.353931] ? check_preemption_disabled+0x48/0x200 [ 45.358928] ? check_preemption_disabled+0x48/0x200 [ 45.363926] ? ext4_ioctl_group_add+0x560/0x560 [ 45.368579] do_vfs_ioctl+0x1de/0x1720 [ 45.372447] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 45.377704] ? ioctl_preallocate+0x300/0x300 [ 45.382094] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.387616] ? __fget_light+0x2e9/0x430 [ 45.391572] ? fget_raw+0x20/0x20 [ 45.395004] ? putname+0xf2/0x130 [ 45.398444] ? rcu_read_lock_sched_held+0x108/0x120 [ 45.403443] ? kmem_cache_free+0x24f/0x290 [ 45.407660] ? putname+0xf7/0x130 [ 45.411095] ? do_syscall_64+0x9a/0x820 [ 45.415048] ? do_syscall_64+0x9a/0x820 [ 45.419003] ? lockdep_hardirqs_on+0x421/0x5c0 [ 45.423574] ? security_file_ioctl+0x94/0xc0 [ 45.427962] ksys_ioctl+0xa9/0xd0 [ 45.431399] __x64_sys_ioctl+0x73/0xb0 [ 45.435269] do_syscall_64+0x1b9/0x820 [ 45.439139] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 45.444484] ? syscall_return_slowpath+0x5e0/0x5e0 [ 45.449400] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.454225] ? trace_hardirqs_on_caller+0x310/0x310 [ 45.459222] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 45.464218] ? prepare_exit_to_usermode+0x291/0x3b0 [ 45.469219] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.474047] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.479218] RIP: 0033:0x440009 [ 45.482396] 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 [ 45.501280] RSP: 002b:00007ffcf7ac64f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 45.508967] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 45.516217] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 45.523464] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 45.530834] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 45.538085] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 45.545337] Modules linked in: [ 45.548633] ---[ end trace b6f9dd69e6fea212 ]--- [ 45.553442] RIP: 0010:rb_erase+0x306/0x3710 [ 45.557855] 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 [ 45.576790] RSP: 0018:ffff8801bb2fe918 EFLAGS: 00010202 [ 45.582153] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 45.589526] RDX: 1ffff1003765fd2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 45.596824] RBP: ffff8801bb2ff320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 45.604088] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6f11970 [ 45.611371] R13: dffffc0000000000 R14: ffff8801bb2ff2f8 R15: ffff8801bb2ff438 [ 45.618673] FS: 00000000018db880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 45.626927] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.632803] CR2: 0000000020000080 CR3: 00000001d84fc000 CR4: 00000000001406f0 [ 45.640090] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.647392] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.654651] Kernel panic - not syncing: Fatal exception [ 45.660810] Kernel Offset: disabled [ 45.664445] Rebooting in 86400 seconds..