[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.943050] audit: type=1800 audit(1538118068.377:25): pid=5658 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 34.971680] audit: type=1800 audit(1538118068.377:26): pid=5658 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.014784] audit: type=1800 audit(1538118068.377:27): pid=5658 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 '10.128.0.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 51.683379] kasan: CONFIG_KASAN_INLINE enabled [ 51.688005] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 51.695500] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 51.701769] CPU: 0 PID: 5811 Comm: syz-executor735 Not tainted 4.19.0-rc5+ #119 [ 51.709329] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.718697] RIP: 0010:rb_erase+0x306/0x3710 [ 51.723004] 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 [ 51.741930] RSP: 0018:ffff8801bc30e918 EFLAGS: 00010202 [ 51.747302] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 51.754668] RDX: 1ffff10037861d2b RSI: ffffffff8b5a08a0 RDI: 0000000000000008 [ 51.761923] RBP: ffff8801bc30f320 R08: dffffc0000000000 R09: fffffbfff135d5c8 [ 51.769222] R10: fffffbfff135d5c8 R11: ffffffff89aeae43 R12: ffff8801da42b1f0 [ 51.776485] R13: dffffc0000000000 R14: ffff8801bc30f2f8 R15: ffff8801bc30f438 [ 51.783748] FS: 0000000001f2d880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 51.791962] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.797829] CR2: 0000000020000000 CR3: 00000001d919e000 CR4: 00000000001406f0 [ 51.805098] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.812379] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.819736] Call Trace: [ 51.822323] ? rb_insert_color+0x1460/0x1460 [ 51.826742] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 51.831706] ? lock_downgrade+0x900/0x900 [ 51.835864] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 51.841646] ? mark_held_locks+0x130/0x130 [ 51.845868] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 51.851164] ? rcu_bh_qs+0xc0/0xc0 [ 51.854696] ? unwind_dump+0x190/0x190 [ 51.858574] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 51.864110] ? mark_held_locks+0x130/0x130 [ 51.868348] ? mark_page_accessed+0xcb0/0x2040 [ 51.872910] ? activate_page+0x1040/0x1040 [ 51.877131] ? activate_page+0x1040/0x1040 [ 51.881352] ? mark_held_locks+0x130/0x130 [ 51.885573] ? kasan_kmalloc+0xc7/0xe0 [ 51.889452] ? kmem_cache_alloc_trace+0x152/0x750 [ 51.894287] ? ima_add_digest_entry+0xcb/0x6a0 [ 51.898852] ? ima_add_template_entry+0x466/0x7f0 [ 51.903705] ? ima_store_template+0x224/0x310 [ 51.908209] ? pagecache_get_page+0x2d8/0xf00 [ 51.912709] ? find_get_pages_contig+0x15b0/0x15b0 [ 51.917633] ? is_bpf_text_address+0xac/0x170 [ 51.922117] ? lock_downgrade+0x900/0x900 [ 51.926250] ? mark_held_locks+0x130/0x130 [ 51.930471] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 51.936386] ? mark_held_locks+0x130/0x130 [ 51.940619] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 51.945982] ? lock_downgrade+0x900/0x900 [ 51.950163] ? kasan_check_read+0x11/0x20 [ 51.954305] ? do_raw_spin_unlock+0xa7/0x2f0 [ 51.958703] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 51.963281] ? mark_held_locks+0x130/0x130 [ 51.967513] ? _raw_spin_unlock+0x2c/0x50 [ 51.971652] ? ext4_discard_preallocations+0x18a/0x13c0 [ 51.977009] ? trace_hardirqs_on+0xbd/0x310 [ 51.981315] ? ext4_exit_mballoc+0xc0/0xc0 [ 51.985539] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 51.990589] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 51.995353] ? modules_open+0xa0/0xa0 [ 51.999141] ? __es_tree_search.isra.12+0x1ba/0x220 [ 52.004148] ? __es_remove_extent+0x9a3/0xba0 [ 52.008637] ? mark_held_locks+0x130/0x130 [ 52.012972] ? lock_downgrade+0x900/0x900 [ 52.017107] ? ext4_es_scan+0x960/0x960 [ 52.021063] ? lock_release+0x970/0x970 [ 52.025032] ? trace_hardirqs_on+0xbd/0x310 [ 52.029337] ? kasan_check_read+0x11/0x20 [ 52.033469] ? clear_inode+0x114/0x3a0 [ 52.037341] ? do_raw_write_trylock+0x1c0/0x1c0 [ 52.041990] ? kasan_check_write+0x14/0x20 [ 52.046210] ? lock_acquire+0x1ed/0x520 [ 52.050170] ? integrity_inode_free+0x77/0x320 [ 52.054748] ? ext4_es_remove_extent+0x151/0x500 [ 52.059492] ? lock_release+0x970/0x970 [ 52.063458] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 52.068654] ? depot_save_stack+0x292/0x470 [ 52.072967] ? kasan_check_write+0x14/0x20 [ 52.077200] ? do_raw_write_lock+0xbd/0x1b0 [ 52.081620] integrity_inode_free+0x12f/0x320 [ 52.086118] security_inode_free+0x19/0x90 [ 52.090430] __destroy_inode+0x328/0x820 [ 52.094487] ? generic_update_time+0x450/0x450 [ 52.099060] ? evict+0x5d8/0x980 [ 52.102430] ? lock_downgrade+0x900/0x900 [ 52.106584] ? __inode_wait_for_writeback+0x2cf/0x380 [ 52.111765] destroy_inode+0xda/0x200 [ 52.115554] ? __destroy_inode+0x820/0x820 [ 52.119773] ? kasan_check_write+0x14/0x20 [ 52.123999] ? do_raw_spin_lock+0xc1/0x200 [ 52.128228] evict+0x5e0/0x980 [ 52.131416] ? jbd2_journal_stop+0x430/0x15d0 [ 52.135917] ? destroy_inode+0x200/0x200 [ 52.140079] ? do_raw_spin_lock+0xc1/0x200 [ 52.144302] ? iput+0x671/0xa90 [ 52.147568] ? lock_downgrade+0x900/0x900 [ 52.151758] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 52.157398] ? kasan_check_read+0x11/0x20 [ 52.161543] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 52.166294] ? lock_downgrade+0x900/0x900 [ 52.170479] ? ext4_ioctl+0x231b/0x4210 [ 52.174450] iput+0x679/0xa90 [ 52.177548] ? inode_add_lru+0x2a0/0x2a0 [ 52.181599] ? up_write+0x7b/0x220 [ 52.185211] ? up_read+0x110/0x110 [ 52.188749] ? up_read+0x110/0x110 [ 52.192277] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.197801] ? check_preemption_disabled+0x48/0x200 [ 52.202829] ext4_ioctl+0x236f/0x4210 [ 52.206623] ? is_bpf_text_address+0xac/0x170 [ 52.211105] ? ext4_ioctl_group_add+0x560/0x560 [ 52.215764] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 52.221615] ? kasan_check_read+0x11/0x20 [ 52.225759] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 52.231022] ? rcu_bh_qs+0xc0/0xc0 [ 52.234549] ? unwind_dump+0x190/0x190 [ 52.238441] ? is_bpf_text_address+0xd3/0x170 [ 52.242929] ? kernel_text_address+0x79/0xf0 [ 52.247327] ? __kernel_text_address+0xd/0x40 [ 52.251810] ? unwind_get_return_address+0x61/0xa0 [ 52.256837] ? __save_stack_trace+0x8d/0xf0 [ 52.261223] ? save_stack+0xa9/0xd0 [ 52.264842] ? save_stack+0x43/0xd0 [ 52.268651] ? __kasan_slab_free+0x102/0x150 [ 52.273056] ? kasan_slab_free+0xe/0x10 [ 52.277020] ? kmem_cache_free+0x83/0x290 [ 52.281153] ? putname+0xf2/0x130 [ 52.284594] ? do_sys_open+0x54d/0x700 [ 52.288469] ? __x64_sys_openat+0x9d/0x100 [ 52.292764] ? do_syscall_64+0x1b9/0x820 [ 52.296821] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.302181] ? trace_hardirqs_off+0xb8/0x310 [ 52.306574] ? kasan_check_read+0x11/0x20 [ 52.310789] ? do_raw_spin_unlock+0xa7/0x2f0 [ 52.315359] ? trace_hardirqs_on+0x310/0x310 [ 52.319784] ? kasan_check_write+0x14/0x20 [ 52.324012] ? trace_hardirqs_off+0xb8/0x310 [ 52.328409] ? trace_hardirqs_on+0x310/0x310 [ 52.332810] ? ext4_ioctl_group_add+0x560/0x560 [ 52.337463] do_vfs_ioctl+0x1de/0x1720 [ 52.341333] ? trace_hardirqs_on+0xbd/0x310 [ 52.345641] ? ioctl_preallocate+0x300/0x300 [ 52.350033] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.355573] ? __fget_light+0x2e9/0x430 [ 52.359530] ? fget_raw+0x20/0x20 [ 52.362965] ? putname+0xf2/0x130 [ 52.366440] ? kmem_cache_free+0x21a/0x290 [ 52.370673] ? putname+0xf7/0x130 [ 52.374146] ? security_file_ioctl+0x94/0xc0 [ 52.378536] ksys_ioctl+0xa9/0xd0 [ 52.382080] __x64_sys_ioctl+0x73/0xb0 [ 52.385958] do_syscall_64+0x1b9/0x820 [ 52.389847] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 52.395205] ? syscall_return_slowpath+0x5e0/0x5e0 [ 52.400121] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.404970] ? trace_hardirqs_on_caller+0x310/0x310 [ 52.409980] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 52.414985] ? prepare_exit_to_usermode+0x291/0x3b0 [ 52.420068] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.424911] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.430103] RIP: 0033:0x440029 [ 52.433317] 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 [ 52.452205] RSP: 002b:00007ffcf880beb8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 52.460048] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 52.467415] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 52.474682] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 52.481933] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018b0 [ 52.489185] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 52.496450] Modules linked in: [ 52.500139] ---[ end trace f37baabaa50b3cf2 ]--- [ 52.505027] RIP: 0010:rb_erase+0x306/0x3710 [ 52.509338] 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 [ 52.528309] RSP: 0018:ffff8801bc30e918 EFLAGS: 00010202 [ 52.533784] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 52.541041] RDX: 1ffff10037861d2b RSI: ffffffff8b5a08a0 RDI: 0000000000000008 [ 52.548346] RBP: ffff8801bc30f320 R08: dffffc0000000000 R09: fffffbfff135d5c8 [ 52.555656] R10: fffffbfff135d5c8 R11: ffffffff89aeae43 R12: ffff8801da42b1f0 [ 52.562914] R13: dffffc0000000000 R14: ffff8801bc30f2f8 R15: ffff8801bc30f438 [ 52.570221] FS: 0000000001f2d880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 52.578482] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.584403] CR2: 0000000020000000 CR3: 00000001d919e000 CR4: 00000000001406f0 [ 52.591815] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.599159] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.606496] Kernel panic - not syncing: Fatal exception [ 52.612948] Kernel Offset: disabled [ 52.616576] Rebooting in 86400 seconds..