[....] 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. [ 27.218100] kauditd_printk_skb: 7 callbacks suppressed [ 27.218112] audit: type=1800 audit(1538591167.526:29): pid=5246 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.246432] audit: type=1800 audit(1538591167.526:30): pid=5246 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.67' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.201166] kasan: CONFIG_KASAN_INLINE enabled [ 39.205940] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 39.213350] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.219715] CPU: 0 PID: 5402 Comm: syz-executor175 Not tainted 4.19.0-rc6+ #42 [ 39.227063] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.236413] RIP: 0010:rb_erase+0x306/0x3710 [ 39.240836] 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 [ 39.259731] RSP: 0018:ffff8801bab66918 EFLAGS: 00010202 [ 39.265082] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.272343] RDX: 1ffff1003756cd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 39.279610] RBP: ffff8801bab67320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 39.286867] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b6b4b1f0 [ 39.294476] R13: dffffc0000000000 R14: ffff8801bab672f8 R15: ffff8801bab67438 [ 39.301744] FS: 0000000001049880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.309962] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.315829] CR2: 0000000020000700 CR3: 00000001d56a7000 CR4: 00000000001406f0 [ 39.323139] Call Trace: [ 39.325730] ? lockdep_on+0x50/0x50 [ 39.329347] ? rb_insert_color+0x1460/0x1460 [ 39.333748] ? noop_count+0x40/0x40 [ 39.337363] ? lock_pin_lock+0x350/0x350 [ 39.341406] ? noop_count+0x40/0x40 [ 39.345023] ? kasan_check_read+0x11/0x20 [ 39.349158] ? noop_count+0x40/0x40 [ 39.352775] ? noop_count+0x40/0x40 [ 39.356390] ? lock_pin_lock+0x350/0x350 [ 39.360443] ? mark_held_locks+0x130/0x130 [ 39.364702] ? check_usage_forwards+0x3e0/0x3e0 [ 39.369473] ? __bfs+0x385/0x7a0 [ 39.372833] ? noop_count+0x40/0x40 [ 39.376450] ? check_usage+0x1a9/0x790 [ 39.380752] ? lock_pin_lock+0x350/0x350 [ 39.384811] ? check_usage_forwards+0x3e0/0x3e0 [ 39.389486] ? __bfs+0x385/0x7a0 [ 39.392845] ? __lock_acquire+0x7ec/0x4ec0 [ 39.397076] ? lockdep_on+0x50/0x50 [ 39.400694] ? lock_pin_lock+0x350/0x350 [ 39.404826] ? mark_held_locks+0x130/0x130 [ 39.409070] ? kasan_check_read+0x11/0x20 [ 39.413210] ? __lock_acquire+0x2881/0x4ec0 [ 39.417526] ? mark_held_locks+0x130/0x130 [ 39.422187] ? print_usage_bug+0xc0/0xc0 [ 39.426256] ? _raw_spin_unlock+0x2c/0x50 [ 39.430403] ? graph_lock+0x170/0x170 [ 39.434199] ? ext4_exit_mballoc+0xc0/0xc0 [ 39.438428] ? __lock_acquire+0x7ec/0x4ec0 [ 39.442709] ? find_held_lock+0x36/0x1c0 [ 39.446774] ? mark_held_locks+0x130/0x130 [ 39.451102] ? lock_downgrade+0x900/0x900 [ 39.455256] ? ext4_es_scan+0x960/0x960 [ 39.459230] ? lock_release+0x970/0x970 [ 39.463200] ? do_raw_write_trylock+0x1c0/0x1c0 [ 39.467909] ? kasan_check_write+0x14/0x20 [ 39.472140] ? lock_acquire+0x1ed/0x520 [ 39.476098] ? integrity_inode_free+0x77/0x320 [ 39.480664] ? ext4_es_remove_extent+0x151/0x500 [ 39.485408] ? lock_release+0x970/0x970 [ 39.489370] ? kasan_check_write+0x14/0x20 [ 39.493646] ? do_raw_write_lock+0xbd/0x1b0 [ 39.497962] integrity_inode_free+0x12f/0x320 [ 39.502587] security_inode_free+0x19/0x90 [ 39.506812] __destroy_inode+0x328/0x820 [ 39.510854] ? generic_update_time+0x450/0x450 [ 39.515417] ? evict+0x5d8/0x980 [ 39.518766] ? lock_downgrade+0x900/0x900 [ 39.522899] ? __inode_wait_for_writeback+0x2cf/0x380 [ 39.528085] destroy_inode+0xda/0x200 [ 39.531868] ? __destroy_inode+0x820/0x820 [ 39.536094] ? kasan_check_write+0x14/0x20 [ 39.540307] ? do_raw_spin_lock+0xc1/0x200 [ 39.544529] evict+0x5e0/0x980 [ 39.547720] ? destroy_inode+0x200/0x200 [ 39.551769] ? iput+0x671/0xa90 [ 39.555032] ? lock_downgrade+0x900/0x900 [ 39.559310] ? kasan_check_read+0x11/0x20 [ 39.563529] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 39.568104] ? lock_downgrade+0x900/0x900 [ 39.572237] iput+0x679/0xa90 [ 39.575330] ? inode_add_lru+0x2a0/0x2a0 [ 39.579428] ? up_write+0x7b/0x220 [ 39.582959] ? up_read+0x110/0x110 [ 39.586481] ? up_read+0x110/0x110 [ 39.590013] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.595540] ? check_preemption_disabled+0x48/0x200 [ 39.600653] ext4_ioctl+0x236f/0x4210 [ 39.604548] ? ext4_ioctl_group_add+0x560/0x560 [ 39.609210] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 39.615007] ? kasan_check_read+0x11/0x20 [ 39.619142] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.624414] ? rcu_bh_qs+0xc0/0xc0 [ 39.627943] ? rcu_bh_qs+0xc0/0xc0 [ 39.631475] ? unwind_dump+0x190/0x190 [ 39.635364] ? is_bpf_text_address+0xd3/0x170 [ 39.639845] ? kernel_text_address+0x79/0xf0 [ 39.644241] ? __kernel_text_address+0xd/0x40 [ 39.648721] ? unwind_get_return_address+0x61/0xa0 [ 39.653656] ? __save_stack_trace+0x8d/0xf0 [ 39.657961] ? save_stack+0xa9/0xd0 [ 39.661586] ? save_stack+0x43/0xd0 [ 39.665207] ? __kasan_slab_free+0x102/0x150 [ 39.669593] ? kasan_slab_free+0xe/0x10 [ 39.673552] ? kmem_cache_free+0x83/0x290 [ 39.677681] ? putname+0xf2/0x130 [ 39.681114] ? do_sys_open+0x54d/0x700 [ 39.684993] ? __x64_sys_open+0x7e/0xc0 [ 39.688951] ? do_syscall_64+0x1b9/0x820 [ 39.692996] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.698345] ? trace_hardirqs_off+0xb8/0x310 [ 39.702746] ? kasan_check_read+0x11/0x20 [ 39.706883] ? do_raw_spin_unlock+0xa7/0x2f0 [ 39.711275] ? trace_hardirqs_on+0x310/0x310 [ 39.715672] ? kasan_check_write+0x14/0x20 [ 39.719892] ? trace_hardirqs_off+0xb8/0x310 [ 39.724285] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.729805] ? check_preemption_disabled+0x48/0x200 [ 39.734806] ? ext4_ioctl_group_add+0x560/0x560 [ 39.739462] do_vfs_ioctl+0x1de/0x1720 [ 39.743345] ? rcu_lockdep_current_cpu_online+0x1f0/0x2d0 [ 39.748863] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.754123] ? ioctl_preallocate+0x300/0x300 [ 39.758512] ? memset+0x31/0x40 [ 39.761780] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.767392] ? smack_file_ioctl+0x210/0x3c0 [ 39.771700] ? fget_raw+0x20/0x20 [ 39.775135] ? smack_file_lock+0x2e0/0x2e0 [ 39.779352] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.784468] ? do_syscall_64+0x9a/0x820 [ 39.788453] ? do_syscall_64+0x9a/0x820 [ 39.792422] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.797945] ? security_file_ioctl+0x94/0xc0 [ 39.802339] ksys_ioctl+0xa9/0xd0 [ 39.805778] __x64_sys_ioctl+0x73/0xb0 [ 39.809652] do_syscall_64+0x1b9/0x820 [ 39.813526] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.818873] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.823791] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.828725] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.833846] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.838847] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.843852] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.848755] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.853940] RIP: 0033:0x440029 [ 39.857117] 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 [ 39.876293] RSP: 002b:00007fffcd6753e8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 39.883998] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 39.891318] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004 [ 39.898582] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.905834] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0 [ 39.913208] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 39.920525] Modules linked in: [ 39.923805] ---[ end trace 6f51e3ffa5585ae9 ]--- [ 39.928564] RIP: 0010:rb_erase+0x306/0x3710 [ 39.932970] 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 [ 39.952033] RSP: 0018:ffff8801bab66918 EFLAGS: 00010202 [ 39.957424] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.964925] RDX: 1ffff1003756cd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 39.972233] RBP: ffff8801bab67320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 39.979498] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b6b4b1f0 [ 39.986829] R13: dffffc0000000000 R14: ffff8801bab672f8 R15: ffff8801bab67438 [ 39.994147] FS: 0000000001049880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 40.002444] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.008328] CR2: 0000000020000700 CR3: 00000001d56a7000 CR4: 00000000001406f0 [ 40.015665] Kernel panic - not syncing: Fatal exception [ 40.022004] Kernel Offset: disabled [ 40.025632] Rebooting in 86400 seconds..