[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 31.610824] audit: type=1800 audit(1539227977.467:25): pid=5634 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 31.630150] audit: type=1800 audit(1539227977.467:26): pid=5634 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 31.654572] audit: type=1800 audit(1539227977.467:27): pid=5634 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.116' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.331287] kasan: CONFIG_KASAN_INLINE enabled [ 42.335877] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.343260] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.349504] CPU: 1 PID: 5788 Comm: syz-executor014 Not tainted 4.19.0-rc6+ #254 [ 42.357169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.366513] RIP: 0010:rb_erase+0x306/0x3710 [ 42.370823] 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 [ 42.389708] RSP: 0018:ffff8801c5b0e918 EFLAGS: 00010202 [ 42.395049] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.402302] RDX: 1ffff10038b61d2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 42.409570] RBP: ffff8801c5b0f320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 42.416826] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b8e4a1f0 [ 42.424089] R13: dffffc0000000000 R14: ffff8801c5b0f2f8 R15: ffff8801c5b0f438 [ 42.431361] FS: 00000000022c1880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 42.439570] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.445432] CR2: 0000000020000040 CR3: 00000001d79e8000 CR4: 00000000001406e0 [ 42.452681] Call Trace: [ 42.455258] ? rb_insert_color+0x1460/0x1460 [ 42.459656] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 42.464580] ? is_bpf_text_address+0xac/0x170 [ 42.469074] ? lock_downgrade+0x900/0x900 [ 42.473210] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.478990] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.484507] ? mark_page_accessed+0xcb0/0x2040 [ 42.489083] ? activate_page+0x1040/0x1040 [ 42.493304] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.498833] ? mark_held_locks+0x130/0x130 [ 42.503047] ? mark_page_accessed+0xcb0/0x2040 [ 42.507604] ? activate_page+0x1040/0x1040 [ 42.511846] ? activate_page+0x1040/0x1040 [ 42.516069] ? mark_held_locks+0x130/0x130 [ 42.520288] ? kasan_kmalloc+0xc7/0xe0 [ 42.524161] ? kmem_cache_alloc_trace+0x152/0x750 [ 42.528984] ? ima_add_digest_entry+0xcb/0x6a0 [ 42.533547] ? ima_add_template_entry+0x466/0x7f0 [ 42.538373] ? ima_store_template+0x224/0x310 [ 42.542857] ? ima_store_measurement+0x321/0x630 [ 42.547597] ? process_measurement+0x15c4/0x1bf0 [ 42.552337] ? ima_file_check+0xe5/0x130 [ 42.556402] ? path_openat+0x134d/0x5160 [ 42.560447] ? do_filp_open+0x255/0x380 [ 42.564400] ? do_sys_open+0x568/0x700 [ 42.568268] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.573287] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 42.578024] ? is_bpf_text_address+0xac/0x170 [ 42.582500] ? lock_downgrade+0x900/0x900 [ 42.586631] ? mark_held_locks+0x130/0x130 [ 42.590861] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.596660] ? mark_held_locks+0x130/0x130 [ 42.600883] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 42.606257] ? lock_downgrade+0x900/0x900 [ 42.610391] ? kasan_check_read+0x11/0x20 [ 42.614519] ? do_raw_spin_unlock+0xa7/0x2f0 [ 42.618923] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 42.623496] ? mark_held_locks+0x130/0x130 [ 42.627713] ? _raw_spin_unlock+0x2c/0x50 [ 42.631872] ? ext4_discard_preallocations+0x18a/0x13c0 [ 42.637220] ? trace_hardirqs_on+0xbd/0x310 [ 42.641527] ? ext4_exit_mballoc+0xc0/0xc0 [ 42.645746] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.650758] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 42.655519] ? modules_open+0xa0/0xa0 [ 42.659302] ? __es_tree_search.isra.12+0x1ba/0x220 [ 42.664302] ? __es_remove_extent+0x9a3/0xba0 [ 42.668783] ? mark_held_locks+0x130/0x130 [ 42.673000] ? lock_downgrade+0x900/0x900 [ 42.677125] ? ext4_es_scan+0x960/0x960 [ 42.681091] ? lock_release+0x970/0x970 [ 42.685048] ? trace_hardirqs_on+0xbd/0x310 [ 42.689351] ? kasan_check_read+0x11/0x20 [ 42.693480] ? clear_inode+0x114/0x3a0 [ 42.697349] ? do_raw_write_trylock+0x1c0/0x1c0 [ 42.702010] ? kasan_check_write+0x14/0x20 [ 42.706228] ? lock_acquire+0x1ed/0x520 [ 42.710195] ? integrity_inode_free+0x77/0x320 [ 42.714758] ? ext4_es_remove_extent+0x151/0x500 [ 42.719498] ? lock_release+0x970/0x970 [ 42.723462] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 42.728563] ? depot_save_stack+0x292/0x470 [ 42.732882] ? kasan_check_write+0x14/0x20 [ 42.737110] ? do_raw_write_lock+0xbd/0x1b0 [ 42.741426] integrity_inode_free+0x12f/0x320 [ 42.745906] security_inode_free+0x19/0x90 [ 42.750123] __destroy_inode+0x328/0x820 [ 42.754191] ? generic_update_time+0x450/0x450 [ 42.758757] ? evict+0x5d8/0x980 [ 42.762104] ? lock_downgrade+0x900/0x900 [ 42.766251] ? __inode_wait_for_writeback+0x2cf/0x380 [ 42.771433] destroy_inode+0xda/0x200 [ 42.775223] ? __destroy_inode+0x820/0x820 [ 42.779440] ? kasan_check_write+0x14/0x20 [ 42.783656] ? do_raw_spin_lock+0xc1/0x200 [ 42.787900] evict+0x5e0/0x980 [ 42.791078] ? jbd2_journal_stop+0x430/0x15d0 [ 42.795557] ? destroy_inode+0x200/0x200 [ 42.799608] ? do_raw_spin_lock+0xc1/0x200 [ 42.803845] ? iput+0x671/0xa90 [ 42.807106] ? lock_downgrade+0x900/0x900 [ 42.811237] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 42.816760] ? kasan_check_read+0x11/0x20 [ 42.820891] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 42.825453] ? lock_downgrade+0x900/0x900 [ 42.829597] ? ext4_ioctl+0x231b/0x4210 [ 42.833578] iput+0x679/0xa90 [ 42.836664] ? inode_add_lru+0x2a0/0x2a0 [ 42.840735] ? up_write+0x7b/0x220 [ 42.844258] ? up_read+0x110/0x110 [ 42.847777] ? up_read+0x110/0x110 [ 42.851302] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.856829] ? check_preemption_disabled+0x48/0x200 [ 42.861854] ext4_ioctl+0x236f/0x4210 [ 42.865638] ? is_bpf_text_address+0xac/0x170 [ 42.870119] ? ext4_ioctl_group_add+0x560/0x560 [ 42.874771] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.880553] ? kasan_check_read+0x11/0x20 [ 42.884683] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 42.889943] ? rcu_bh_qs+0xc0/0xc0 [ 42.893474] ? unwind_dump+0x190/0x190 [ 42.897373] ? is_bpf_text_address+0xd3/0x170 [ 42.901876] ? kernel_text_address+0x79/0xf0 [ 42.906266] ? __kernel_text_address+0xd/0x40 [ 42.910747] ? unwind_get_return_address+0x61/0xa0 [ 42.915659] ? __save_stack_trace+0x8d/0xf0 [ 42.919967] ? save_stack+0xa9/0xd0 [ 42.923569] ? save_stack+0x43/0xd0 [ 42.927173] ? __kasan_slab_free+0x102/0x150 [ 42.931578] ? kasan_slab_free+0xe/0x10 [ 42.935533] ? kmem_cache_free+0x83/0x290 [ 42.939659] ? putname+0xf2/0x130 [ 42.943089] ? do_sys_open+0x54d/0x700 [ 42.946955] ? __x64_sys_openat+0x9d/0x100 [ 42.951170] ? do_syscall_64+0x1b9/0x820 [ 42.955212] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.960561] ? trace_hardirqs_off+0xb8/0x310 [ 42.964946] ? kasan_check_read+0x11/0x20 [ 42.969080] ? do_raw_spin_unlock+0xa7/0x2f0 [ 42.973467] ? trace_hardirqs_on+0x310/0x310 [ 42.977856] ? kasan_check_write+0x14/0x20 [ 42.982088] ? trace_hardirqs_off+0xb8/0x310 [ 42.986482] ? trace_hardirqs_on+0x310/0x310 [ 42.990911] ? ext4_ioctl_group_add+0x560/0x560 [ 42.995564] do_vfs_ioctl+0x1de/0x1720 [ 42.999434] ? trace_hardirqs_on+0xbd/0x310 [ 43.003737] ? ioctl_preallocate+0x300/0x300 [ 43.008126] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.013647] ? __fget_light+0x2e9/0x430 [ 43.017628] ? fget_raw+0x20/0x20 [ 43.021061] ? putname+0xf2/0x130 [ 43.024498] ? kmem_cache_free+0x21a/0x290 [ 43.028718] ? putname+0xf7/0x130 [ 43.032160] ? security_file_ioctl+0x94/0xc0 [ 43.036551] ksys_ioctl+0xa9/0xd0 [ 43.039989] __x64_sys_ioctl+0x73/0xb0 [ 43.043855] do_syscall_64+0x1b9/0x820 [ 43.047725] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 43.053072] ? syscall_return_slowpath+0x5e0/0x5e0 [ 43.057982] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.062805] ? trace_hardirqs_on_caller+0x310/0x310 [ 43.067805] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 43.072812] ? prepare_exit_to_usermode+0x291/0x3b0 [ 43.077813] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.082657] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.087828] RIP: 0033:0x4400b9 [ 43.091004] 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 [ 43.109886] RSP: 002b:00007ffeaa067db8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 43.117586] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400b9 [ 43.124861] RDX: 00000000004400b9 RSI: 0000000000006611 RDI: 0000000000000004 [ 43.132114] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 43.139372] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401940 [ 43.146621] R13: 00000000004019d0 R14: 0000000000000000 R15: 0000000000000000 [ 43.153872] Modules linked in: [ 43.157189] ---[ end trace e88dbdfabf2c9855 ]--- [ 43.161991] RIP: 0010:rb_erase+0x306/0x3710 [ 43.166330] 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 [ 43.185248] RSP: 0018:ffff8801c5b0e918 EFLAGS: 00010202 [ 43.190633] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 43.197904] RDX: 1ffff10038b61d2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 43.205193] RBP: ffff8801c5b0f320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 43.212487] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b8e4a1f0 [ 43.219775] R13: dffffc0000000000 R14: ffff8801c5b0f2f8 R15: ffff8801c5b0f438 [ 43.227047] FS: 00000000022c1880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 43.235281] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.241178] CR2: 0000000020000040 CR3: 00000001d79e8000 CR4: 00000000001406e0 [ 43.248432] Kernel panic - not syncing: Fatal exception [ 43.254658] Kernel Offset: disabled [ 43.258280] Rebooting in 86400 seconds..