[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.864019] audit: type=1800 audit(1539198043.836:25): pid=5688 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 38.903082] audit: type=1800 audit(1539198043.836:26): pid=5688 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.929636] audit: type=1800 audit(1539198043.836:27): pid=5688 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.29' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.971505] kasan: CONFIG_KASAN_INLINE enabled [ 50.976102] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 50.983510] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 50.989761] CPU: 1 PID: 5840 Comm: syz-executor479 Not tainted 4.19.0-rc7+ #53 [ 50.997123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.006478] RIP: 0010:rb_erase+0x306/0x3710 [ 51.010790] 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 [ 51.029691] RSP: 0018:ffff8801d325e918 EFLAGS: 00010202 [ 51.035056] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 51.042317] RDX: 1ffff1003a64bd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 51.049576] RBP: ffff8801d325f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 51.056874] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8a317b0 [ 51.064134] R13: dffffc0000000000 R14: ffff8801d325f2f8 R15: ffff8801d325f438 [ 51.071391] FS: 0000000001b7d880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 51.079600] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.085469] CR2: 0000000020000080 CR3: 00000001d3631000 CR4: 00000000001406e0 [ 51.092726] Call Trace: [ 51.095308] ? rb_insert_color+0x1460/0x1460 [ 51.099726] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 51.104661] ? lock_downgrade+0x900/0x900 [ 51.108796] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 51.114595] ? mark_held_locks+0x130/0x130 [ 51.118828] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 51.124091] ? rcu_bh_qs+0xc0/0xc0 [ 51.127641] ? unwind_dump+0x190/0x190 [ 51.131554] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 51.137075] ? mark_held_locks+0x130/0x130 [ 51.141297] ? mark_page_accessed+0xcb0/0x2040 [ 51.145910] ? activate_page+0x1040/0x1040 [ 51.150199] ? activate_page+0x1040/0x1040 [ 51.154428] ? mark_held_locks+0x130/0x130 [ 51.158644] ? kasan_kmalloc+0xc7/0xe0 [ 51.162524] ? kmem_cache_alloc_trace+0x152/0x750 [ 51.167351] ? ima_add_digest_entry+0xcb/0x6a0 [ 51.171924] ? ima_add_template_entry+0x466/0x7f0 [ 51.176746] ? ima_store_template+0x224/0x310 [ 51.181224] ? pagecache_get_page+0x2d8/0xf00 [ 51.185702] ? find_get_pages_contig+0x15b0/0x15b0 [ 51.190616] ? is_bpf_text_address+0xac/0x170 [ 51.195101] ? lock_downgrade+0x900/0x900 [ 51.199233] ? mark_held_locks+0x130/0x130 [ 51.203450] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 51.209234] ? mark_held_locks+0x130/0x130 [ 51.213460] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 51.218808] ? lock_downgrade+0x900/0x900 [ 51.222942] ? kasan_check_read+0x11/0x20 [ 51.227077] ? do_raw_spin_unlock+0xa7/0x2f0 [ 51.231498] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 51.236121] ? mark_held_locks+0x130/0x130 [ 51.240355] ? _raw_spin_unlock+0x2c/0x50 [ 51.244490] ? ext4_discard_preallocations+0x18a/0x13c0 [ 51.249854] ? trace_hardirqs_on+0xbd/0x310 [ 51.254173] ? ext4_exit_mballoc+0xc0/0xc0 [ 51.258394] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 51.263400] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 51.268145] ? modules_open+0xa0/0xa0 [ 51.271936] ? __es_tree_search.isra.12+0x1ba/0x220 [ 51.276940] ? __es_remove_extent+0x9a3/0xba0 [ 51.281442] ? mark_held_locks+0x130/0x130 [ 51.285666] ? lock_downgrade+0x900/0x900 [ 51.289800] ? ext4_es_scan+0x960/0x960 [ 51.293756] ? lock_release+0x970/0x970 [ 51.297758] ? trace_hardirqs_on+0xbd/0x310 [ 51.302076] ? kasan_check_read+0x11/0x20 [ 51.306209] ? clear_inode+0x114/0x3a0 [ 51.310083] ? do_raw_write_trylock+0x1c0/0x1c0 [ 51.314786] ? kasan_check_write+0x14/0x20 [ 51.319057] ? lock_acquire+0x1ed/0x520 [ 51.323026] ? integrity_inode_free+0x77/0x320 [ 51.327591] ? ext4_es_remove_extent+0x151/0x500 [ 51.332332] ? lock_release+0x970/0x970 [ 51.336289] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 51.341375] ? depot_save_stack+0x292/0x470 [ 51.345690] ? kasan_check_write+0x14/0x20 [ 51.349912] ? do_raw_write_lock+0xbd/0x1b0 [ 51.354225] integrity_inode_free+0x12f/0x320 [ 51.358712] security_inode_free+0x19/0x90 [ 51.362938] __destroy_inode+0x328/0x820 [ 51.366986] ? generic_update_time+0x450/0x450 [ 51.371599] ? evict+0x5d8/0x980 [ 51.374955] ? lock_downgrade+0x900/0x900 [ 51.379086] ? __inode_wait_for_writeback+0x2cf/0x380 [ 51.384265] destroy_inode+0xda/0x200 [ 51.388060] ? __destroy_inode+0x820/0x820 [ 51.392294] ? kasan_check_write+0x14/0x20 [ 51.396516] ? do_raw_spin_lock+0xc1/0x200 [ 51.400740] evict+0x5e0/0x980 [ 51.403919] ? jbd2_journal_stop+0x430/0x15d0 [ 51.408396] ? destroy_inode+0x200/0x200 [ 51.412445] ? do_raw_spin_lock+0xc1/0x200 [ 51.416708] ? iput+0x671/0xa90 [ 51.419983] ? lock_downgrade+0x900/0x900 [ 51.424116] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 51.429641] ? kasan_check_read+0x11/0x20 [ 51.433784] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 51.438354] ? lock_downgrade+0x900/0x900 [ 51.442487] ? ext4_ioctl+0x231b/0x4210 [ 51.446453] iput+0x679/0xa90 [ 51.449547] ? inode_add_lru+0x2a0/0x2a0 [ 51.453595] ? up_write+0x7b/0x220 [ 51.457119] ? up_read+0x110/0x110 [ 51.460649] ? up_read+0x110/0x110 [ 51.464179] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.469709] ? check_preemption_disabled+0x48/0x200 [ 51.474775] ext4_ioctl+0x236f/0x4210 [ 51.478569] ? is_bpf_text_address+0xac/0x170 [ 51.483055] ? ext4_ioctl_group_add+0x560/0x560 [ 51.487716] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 51.493547] ? kasan_check_read+0x11/0x20 [ 51.497689] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 51.502955] ? rcu_bh_qs+0xc0/0xc0 [ 51.506482] ? unwind_dump+0x190/0x190 [ 51.510360] ? is_bpf_text_address+0xd3/0x170 [ 51.514893] ? kernel_text_address+0x79/0xf0 [ 51.519291] ? __kernel_text_address+0xd/0x40 [ 51.523776] ? unwind_get_return_address+0x61/0xa0 [ 51.528696] ? __save_stack_trace+0x8d/0xf0 [ 51.533008] ? save_stack+0xa9/0xd0 [ 51.536621] ? save_stack+0x43/0xd0 [ 51.540233] ? __kasan_slab_free+0x102/0x150 [ 51.544630] ? kasan_slab_free+0xe/0x10 [ 51.548592] ? kmem_cache_free+0x83/0x290 [ 51.552724] ? putname+0xf2/0x130 [ 51.556160] ? do_sys_open+0x54d/0x700 [ 51.560030] ? __x64_sys_openat+0x9d/0x100 [ 51.564256] ? do_syscall_64+0x1b9/0x820 [ 51.568306] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.573662] ? trace_hardirqs_off+0xb8/0x310 [ 51.578054] ? kasan_check_read+0x11/0x20 [ 51.582190] ? do_raw_spin_unlock+0xa7/0x2f0 [ 51.586582] ? trace_hardirqs_on+0x310/0x310 [ 51.590977] ? kasan_check_write+0x14/0x20 [ 51.595194] ? trace_hardirqs_off+0xb8/0x310 [ 51.599592] ? trace_hardirqs_on+0x310/0x310 [ 51.603988] ? ext4_ioctl_group_add+0x560/0x560 [ 51.608651] do_vfs_ioctl+0x1de/0x1720 [ 51.612528] ? trace_hardirqs_on+0xbd/0x310 [ 51.616837] ? ioctl_preallocate+0x300/0x300 [ 51.621237] ? memset+0x31/0x40 [ 51.624554] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.630367] ? smack_file_ioctl+0x210/0x3c0 [ 51.634678] ? fget_raw+0x20/0x20 [ 51.638121] ? smack_file_lock+0x2e0/0x2e0 [ 51.642352] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.647885] ? security_file_ioctl+0x94/0xc0 [ 51.652289] ksys_ioctl+0xa9/0xd0 [ 51.655737] __x64_sys_ioctl+0x73/0xb0 [ 51.659662] do_syscall_64+0x1b9/0x820 [ 51.663596] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 51.668956] ? syscall_return_slowpath+0x5e0/0x5e0 [ 51.673875] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.678774] ? trace_hardirqs_on_caller+0x310/0x310 [ 51.683786] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 51.688787] ? prepare_exit_to_usermode+0x291/0x3b0 [ 51.693792] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.698624] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.703801] RIP: 0033:0x440009 [ 51.706984] 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 [ 51.725996] RSP: 002b:00007ffcd4422aa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 51.733695] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 51.740951] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 51.748206] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 51.755517] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 51.762778] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 51.770051] Modules linked in: [ 51.773382] ---[ end trace 392ab65eb5a02da8 ]--- [ 51.778215] RIP: 0010:rb_erase+0x306/0x3710 [ 51.782577] 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 [ 51.801511] RSP: 0018:ffff8801d325e918 EFLAGS: 00010202 [ 51.806866] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 51.814163] RDX: 1ffff1003a64bd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 51.821461] RBP: ffff8801d325f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 51.828719] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8a317b0 [ 51.836017] R13: dffffc0000000000 R14: ffff8801d325f2f8 R15: ffff8801d325f438 [ 51.843319] FS: 0000000001b7d880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 51.851573] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.857462] CR2: 0000000020000080 CR3: 00000001d3631000 CR4: 00000000001406e0 [ 51.864759] Kernel panic - not syncing: Fatal exception [ 51.871053] Kernel Offset: disabled [ 51.874678] Rebooting in 86400 seconds..