[....] 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. [ 28.569895] kauditd_printk_skb: 7 callbacks suppressed [ 28.569907] audit: type=1800 audit(1540234859.399:29): pid=5249 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 28.596052] audit: type=1800 audit(1540234859.399:30): pid=5249 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 syzkaller login: [ 31.716318] sshd (5389) used greatest stack depth: 15976 bytes left Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. executing program [ 38.222451] kasan: CONFIG_KASAN_INLINE enabled [ 38.227257] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.234621] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.240858] CPU: 0 PID: 5405 Comm: syz-executor045 Not tainted 4.19.0+ #74 [ 38.247866] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.257347] RIP: 0010:rb_erase+0x306/0x3710 [ 38.261660] 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 [ 38.280656] RSP: 0018:ffff8801ba536918 EFLAGS: 00010202 [ 38.286010] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.293321] RDX: 1ffff100374a6d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 38.300586] RBP: ffff8801ba537320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 38.307899] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801c2c21270 [ 38.315227] R13: dffffc0000000000 R14: ffff8801ba5372f8 R15: ffff8801ba537438 [ 38.322493] FS: 00000000008cc880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 38.330708] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.336571] CR2: 0000000020000080 CR3: 00000001baf20000 CR4: 00000000001406f0 [ 38.343836] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.351089] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.358480] Call Trace: [ 38.361065] ? lockdep_on+0x50/0x50 [ 38.364685] ? rb_insert_color+0x1460/0x1460 [ 38.369076] ? lock_downgrade+0x900/0x900 [ 38.373206] ? noop_count+0x40/0x40 [ 38.376877] ? lock_pin_lock+0x350/0x350 [ 38.380930] ? rcu_bh_qs+0xc0/0xc0 [ 38.384498] ? unwind_dump+0x190/0x190 [ 38.388382] ? kasan_check_read+0x11/0x20 [ 38.392523] ? noop_count+0x40/0x40 [ 38.396139] ? lock_pin_lock+0x350/0x350 [ 38.400180] ? mark_held_locks+0x130/0x130 [ 38.404394] ? check_usage_forwards+0x3e0/0x3e0 [ 38.409052] ? __bfs+0x385/0x7a0 [ 38.412412] ? check_usage+0x1a9/0x790 [ 38.416287] ? lock_pin_lock+0x350/0x350 [ 38.420339] ? check_usage_forwards+0x3e0/0x3e0 [ 38.424991] ? __bfs+0x385/0x7a0 [ 38.429095] ? modules_open+0xa0/0xa0 [ 38.432922] ? lockdep_on+0x50/0x50 [ 38.436536] ? lock_pin_lock+0x350/0x350 [ 38.440599] ? mark_held_locks+0x130/0x130 [ 38.444834] ? kasan_check_read+0x11/0x20 [ 38.448968] ? __lock_acquire+0x2881/0x4ec0 [ 38.453285] ? mark_held_locks+0x130/0x130 [ 38.457561] ? print_usage_bug+0xc0/0xc0 [ 38.461611] ? _raw_spin_unlock+0x2c/0x50 [ 38.465742] ? graph_lock+0x170/0x170 [ 38.469531] ? ext4_exit_mballoc+0xc0/0xc0 [ 38.473752] ? __lock_acquire+0x7ec/0x4ec0 [ 38.477976] ? find_held_lock+0x36/0x1c0 [ 38.482023] ? mark_held_locks+0x130/0x130 [ 38.486284] ? lock_downgrade+0x900/0x900 [ 38.490423] ? ext4_es_scan+0x960/0x960 [ 38.494414] ? lock_release+0x970/0x970 [ 38.498476] ? do_raw_write_trylock+0x1c0/0x1c0 [ 38.503134] ? kasan_check_write+0x14/0x20 [ 38.507459] ? lock_acquire+0x1ed/0x520 [ 38.511537] ? integrity_inode_free+0x77/0x320 [ 38.516173] ? ext4_es_remove_extent+0x151/0x500 [ 38.520919] ? lock_release+0x970/0x970 [ 38.524890] ? kasan_check_write+0x14/0x20 [ 38.529118] ? do_raw_write_lock+0xbd/0x1e0 [ 38.533434] integrity_inode_free+0x12f/0x320 [ 38.537915] security_inode_free+0x19/0x90 [ 38.542133] __destroy_inode+0x328/0x820 [ 38.546324] ? generic_update_time+0x450/0x450 [ 38.550910] ? evict+0x5d8/0x980 [ 38.554269] ? lock_downgrade+0x900/0x900 [ 38.558409] ? __inode_wait_for_writeback+0x2cf/0x380 [ 38.563590] destroy_inode+0xda/0x200 [ 38.567381] ? __destroy_inode+0x820/0x820 [ 38.571603] ? kasan_check_write+0x14/0x20 [ 38.575830] ? do_raw_spin_lock+0xc1/0x230 [ 38.580054] evict+0x5e0/0x980 [ 38.583250] ? destroy_inode+0x200/0x200 [ 38.587304] ? iput+0x671/0xa90 [ 38.590571] ? lock_downgrade+0x900/0x900 [ 38.594718] ? kasan_check_read+0x11/0x20 [ 38.599020] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 38.603585] ? lock_downgrade+0x900/0x900 [ 38.607723] iput+0x679/0xa90 [ 38.610830] ? inode_add_lru+0x2a0/0x2a0 [ 38.614875] ? up_write+0x7b/0x220 [ 38.618394] ? up_read+0x110/0x110 [ 38.621912] ? up_read+0x110/0x110 [ 38.625445] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.630969] ? check_preemption_disabled+0x48/0x280 [ 38.635978] ext4_ioctl+0x236f/0x4210 [ 38.639768] ? is_bpf_text_address+0xac/0x170 [ 38.644253] ? ext4_ioctl_group_add+0x560/0x560 [ 38.648911] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 38.654696] ? kasan_check_read+0x11/0x20 [ 38.658941] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.664212] ? rcu_bh_qs+0xc0/0xc0 [ 38.667852] ? rcu_bh_qs+0xc0/0xc0 [ 38.671385] ? unwind_dump+0x190/0x190 [ 38.675268] ? is_bpf_text_address+0xd3/0x170 [ 38.679751] ? kernel_text_address+0x79/0xf0 [ 38.684160] ? __kernel_text_address+0xd/0x40 [ 38.688661] ? unwind_get_return_address+0x61/0xa0 [ 38.693714] ? __save_stack_trace+0x8d/0xf0 [ 38.698034] ? save_stack+0xa9/0xd0 [ 38.701658] ? save_stack+0x43/0xd0 [ 38.705270] ? __kasan_slab_free+0x102/0x150 [ 38.709667] ? kasan_slab_free+0xe/0x10 [ 38.713633] ? kmem_cache_free+0x83/0x290 [ 38.717808] ? putname+0xf2/0x130 [ 38.721258] ? do_sys_open+0x54d/0x700 [ 38.725218] ? __x64_sys_openat+0x9d/0x100 [ 38.729450] ? do_syscall_64+0x1b9/0x820 [ 38.733497] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.738854] ? trace_hardirqs_off+0xb8/0x310 [ 38.743254] ? kasan_check_read+0x11/0x20 [ 38.747465] ? do_raw_spin_unlock+0xa7/0x330 [ 38.751862] ? trace_hardirqs_on+0x310/0x310 [ 38.756283] ? kasan_check_write+0x14/0x20 [ 38.760513] ? trace_hardirqs_off+0xb8/0x310 [ 38.765016] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.770548] ? check_preemption_disabled+0x48/0x280 [ 38.775556] ? check_preemption_disabled+0x48/0x280 [ 38.780558] ? ext4_ioctl_group_add+0x560/0x560 [ 38.785226] do_vfs_ioctl+0x1de/0x1720 [ 38.789160] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.794434] ? ioctl_preallocate+0x300/0x300 [ 38.798870] ? memset+0x31/0x40 [ 38.802143] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.807758] ? smack_file_ioctl+0x210/0x3c0 [ 38.812066] ? fget_raw+0x20/0x20 [ 38.815510] ? smack_file_lock+0x2e0/0x2e0 [ 38.819745] ? do_syscall_64+0x9a/0x820 [ 38.823715] ? do_syscall_64+0x9a/0x820 [ 38.827696] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.833290] ? security_file_ioctl+0x94/0xc0 [ 38.837699] ksys_ioctl+0xa9/0xd0 [ 38.841148] __x64_sys_ioctl+0x73/0xb0 [ 38.845033] do_syscall_64+0x1b9/0x820 [ 38.848916] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.854271] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.859182] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.864012] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.869010] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.874060] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.879088] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.883971] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.889154] RIP: 0033:0x440009 [ 38.892337] 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 [ 38.911537] RSP: 002b:00007ffd7bbced38 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 38.919245] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 38.926503] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 38.933760] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 38.941014] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 38.948272] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 38.955534] Modules linked in: [ 38.958906] ---[ end trace 34ef1fb4bba704d7 ]--- [ 38.963672] RIP: 0010:rb_erase+0x306/0x3710 [ 38.968095] 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 [ 38.987106] RSP: 0018:ffff8801ba536918 EFLAGS: 00010202 [ 38.992464] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.999925] RDX: 1ffff100374a6d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 39.007229] RBP: ffff8801ba537320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 39.014490] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801c2c21270 [ 39.021796] R13: dffffc0000000000 R14: ffff8801ba5372f8 R15: ffff8801ba537438 [ 39.029531] FS: 00000000008cc880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.037782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.043654] CR2: 0000000020000080 CR3: 00000001baf20000 CR4: 00000000001406f0 [ 39.050969] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.058302] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.065605] Kernel panic - not syncing: Fatal exception [ 39.071987] Kernel Offset: disabled [ 39.075614] Rebooting in 86400 seconds..