[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.451880] audit: type=1800 audit(1539272012.694:25): pid=5643 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 38.487852] audit: type=1800 audit(1539272012.724:26): pid=5643 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.520715] audit: type=1800 audit(1539272012.724:27): pid=5643 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 '10.128.0.6' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.625213] kasan: CONFIG_KASAN_INLINE enabled [ 50.629825] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 50.637215] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 50.643444] CPU: 0 PID: 5797 Comm: syz-executor548 Not tainted 4.19.0-rc7+ #55 [ 50.650787] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.660239] RIP: 0010:rb_erase+0x306/0x3710 [ 50.664556] 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 [ 50.683505] RSP: 0018:ffff8801d34de918 EFLAGS: 00010202 [ 50.688864] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 50.696213] RDX: 1ffff1003a69bd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 50.703561] RBP: ffff8801d34df320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 50.710836] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c34012f0 [ 50.718110] R13: dffffc0000000000 R14: ffff8801d34df2f8 R15: ffff8801d34df438 [ 50.725372] FS: 0000000001f5e880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 50.733591] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.739459] CR2: 0000000020000040 CR3: 00000001d355b000 CR4: 00000000001406f0 [ 50.746722] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.754055] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.761322] Call Trace: [ 50.763916] ? rb_insert_color+0x1460/0x1460 [ 50.768315] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 50.773057] ? is_bpf_text_address+0xac/0x170 [ 50.777538] ? lock_downgrade+0x900/0x900 [ 50.781672] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 50.787452] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.792972] ? mark_page_accessed+0xcb0/0x2040 [ 50.797538] ? activate_page+0x1040/0x1040 [ 50.801756] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.807279] ? mark_held_locks+0x130/0x130 [ 50.811655] ? mark_page_accessed+0xcb0/0x2040 [ 50.816234] ? activate_page+0x1040/0x1040 [ 50.820460] ? activate_page+0x1040/0x1040 [ 50.824684] ? mark_held_locks+0x130/0x130 [ 50.828905] ? kasan_kmalloc+0xc7/0xe0 [ 50.832773] ? kmem_cache_alloc_trace+0x152/0x750 [ 50.837667] ? ima_add_digest_entry+0xcb/0x6a0 [ 50.842256] ? ima_add_template_entry+0x466/0x7f0 [ 50.847092] ? ima_store_template+0x224/0x310 [ 50.851579] ? ima_store_measurement+0x321/0x630 [ 50.856315] ? process_measurement+0x15c4/0x1bf0 [ 50.861053] ? ima_file_check+0xe5/0x130 [ 50.865099] ? path_openat+0x134d/0x5160 [ 50.869139] ? do_filp_open+0x255/0x380 [ 50.873094] ? do_sys_open+0x568/0x700 [ 50.876968] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 50.881965] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 50.886713] ? is_bpf_text_address+0xac/0x170 [ 50.891189] ? lock_downgrade+0x900/0x900 [ 50.895320] ? mark_held_locks+0x130/0x130 [ 50.899541] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 50.905339] ? mark_held_locks+0x130/0x130 [ 50.909572] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 50.914927] ? lock_downgrade+0x900/0x900 [ 50.919066] ? kasan_check_read+0x11/0x20 [ 50.923200] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.927737] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 50.932318] ? mark_held_locks+0x130/0x130 [ 50.936549] ? _raw_spin_unlock+0x2c/0x50 [ 50.940746] ? ext4_discard_preallocations+0x18a/0x13c0 [ 50.946396] ? trace_hardirqs_on+0xbd/0x310 [ 50.950713] ? ext4_exit_mballoc+0xc0/0xc0 [ 50.954935] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 50.960137] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 50.965270] ? modules_open+0xa0/0xa0 [ 50.969180] ? __es_tree_search.isra.12+0x1ba/0x220 [ 50.974201] ? __es_remove_extent+0x9a3/0xba0 [ 50.978691] ? mark_held_locks+0x130/0x130 [ 50.982919] ? lock_downgrade+0x900/0x900 [ 50.987062] ? ext4_es_scan+0x960/0x960 [ 50.991026] ? lock_release+0x970/0x970 [ 50.994988] ? trace_hardirqs_on+0xbd/0x310 [ 50.999296] ? kasan_check_read+0x11/0x20 [ 51.003438] ? clear_inode+0x114/0x3a0 [ 51.007319] ? do_raw_write_trylock+0x1c0/0x1c0 [ 51.011986] ? kasan_check_write+0x14/0x20 [ 51.016216] ? lock_acquire+0x1ed/0x520 [ 51.020233] ? integrity_inode_free+0x77/0x320 [ 51.024897] ? ext4_es_remove_extent+0x151/0x500 [ 51.029661] ? lock_release+0x970/0x970 [ 51.033626] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 51.038722] ? depot_save_stack+0x292/0x470 [ 51.043037] ? kasan_check_write+0x14/0x20 [ 51.047260] ? do_raw_write_lock+0xbd/0x1b0 [ 51.051573] integrity_inode_free+0x12f/0x320 [ 51.056163] security_inode_free+0x19/0x90 [ 51.060388] __destroy_inode+0x328/0x820 [ 51.064438] ? generic_update_time+0x450/0x450 [ 51.069022] ? evict+0x5d8/0x980 [ 51.072377] ? lock_downgrade+0x900/0x900 [ 51.076577] ? __inode_wait_for_writeback+0x2cf/0x380 [ 51.081788] destroy_inode+0xda/0x200 [ 51.087343] ? __destroy_inode+0x820/0x820 [ 51.091569] ? kasan_check_write+0x14/0x20 [ 51.095795] ? do_raw_spin_lock+0xc1/0x200 [ 51.100031] evict+0x5e0/0x980 [ 51.103218] ? jbd2_journal_stop+0x430/0x15d0 [ 51.107709] ? destroy_inode+0x200/0x200 [ 51.111776] ? do_raw_spin_lock+0xc1/0x200 [ 51.116003] ? iput+0x671/0xa90 [ 51.119273] ? lock_downgrade+0x900/0x900 [ 51.123407] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 51.128930] ? kasan_check_read+0x11/0x20 [ 51.133065] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 51.137733] ? lock_downgrade+0x900/0x900 [ 51.141897] ? ext4_ioctl+0x231b/0x4210 [ 51.145864] iput+0x679/0xa90 [ 51.148954] ? inode_add_lru+0x2a0/0x2a0 [ 51.153001] ? up_write+0x7b/0x220 [ 51.156523] ? up_read+0x110/0x110 [ 51.160047] ? up_read+0x110/0x110 [ 51.163573] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.169096] ? check_preemption_disabled+0x48/0x200 [ 51.174096] ext4_ioctl+0x236f/0x4210 [ 51.177885] ? is_bpf_text_address+0xac/0x170 [ 51.182365] ? ext4_ioctl_group_add+0x560/0x560 [ 51.187036] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 51.192837] ? kasan_check_read+0x11/0x20 [ 51.196977] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 51.202357] ? rcu_bh_qs+0xc0/0xc0 [ 51.205889] ? unwind_dump+0x190/0x190 [ 51.209772] ? is_bpf_text_address+0xd3/0x170 [ 51.214263] ? kernel_text_address+0x79/0xf0 [ 51.218664] ? __kernel_text_address+0xd/0x40 [ 51.223158] ? unwind_get_return_address+0x61/0xa0 [ 51.228081] ? __save_stack_trace+0x8d/0xf0 [ 51.232502] ? save_stack+0xa9/0xd0 [ 51.236123] ? save_stack+0x43/0xd0 [ 51.239752] ? __kasan_slab_free+0x102/0x150 [ 51.244149] ? kasan_slab_free+0xe/0x10 [ 51.248129] ? kmem_cache_free+0x83/0x290 [ 51.252273] ? putname+0xf2/0x130 [ 51.255720] ? do_sys_open+0x54d/0x700 [ 51.259594] ? __x64_sys_openat+0x9d/0x100 [ 51.263813] ? do_syscall_64+0x1b9/0x820 [ 51.267862] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.273216] ? trace_hardirqs_off+0xb8/0x310 [ 51.277605] ? kasan_check_read+0x11/0x20 [ 51.281739] ? do_raw_spin_unlock+0xa7/0x2f0 [ 51.286132] ? trace_hardirqs_on+0x310/0x310 [ 51.290527] ? kasan_check_write+0x14/0x20 [ 51.294753] ? trace_hardirqs_off+0xb8/0x310 [ 51.299162] ? trace_hardirqs_on+0x310/0x310 [ 51.303652] ? ext4_ioctl_group_add+0x560/0x560 [ 51.308329] do_vfs_ioctl+0x1de/0x1720 [ 51.312207] ? trace_hardirqs_on+0xbd/0x310 [ 51.316515] ? ioctl_preallocate+0x300/0x300 [ 51.320910] ? memset+0x31/0x40 [ 51.324176] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.329861] ? smack_file_ioctl+0x210/0x3c0 [ 51.334177] ? fget_raw+0x20/0x20 [ 51.337619] ? smack_file_lock+0x2e0/0x2e0 [ 51.341847] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.347476] ? security_file_ioctl+0x94/0xc0 [ 51.351886] ksys_ioctl+0xa9/0xd0 [ 51.355334] __x64_sys_ioctl+0x73/0xb0 [ 51.359209] do_syscall_64+0x1b9/0x820 [ 51.363096] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 51.368467] ? syscall_return_slowpath+0x5e0/0x5e0 [ 51.373385] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.378218] ? trace_hardirqs_on_caller+0x310/0x310 [ 51.383235] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 51.388294] ? prepare_exit_to_usermode+0x291/0x3b0 [ 51.393320] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.398311] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.403491] RIP: 0033:0x440029 [ 51.406683] 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 [ 51.425581] RSP: 002b:00007ffff6ec1288 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 51.433288] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 51.440639] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004 [ 51.447955] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 51.455224] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0 [ 51.462485] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 51.469746] Modules linked in: [ 51.473252] ---[ end trace 920a0f90650a958a ]--- [ 51.478046] RIP: 0010:rb_erase+0x306/0x3710 [ 51.482357] 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 [ 51.501353] RSP: 0018:ffff8801d34de918 EFLAGS: 00010202 [ 51.506743] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 51.514131] RDX: 1ffff1003a69bd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 51.521468] RBP: ffff8801d34df320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 51.528774] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c34012f0 [ 51.536170] R13: dffffc0000000000 R14: ffff8801d34df2f8 R15: ffff8801d34df438 [ 51.543506] FS: 0000000001f5e880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 51.551787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.557688] CR2: 0000000020000040 CR3: 00000001d355b000 CR4: 00000000001406f0 [ 51.564974] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.572247] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.579565] Kernel panic - not syncing: Fatal exception [ 51.586188] Kernel Offset: disabled [ 51.589821] Rebooting in 86400 seconds..