[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.247457] audit: type=1800 audit(1539240430.527:25): pid=5627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.266604] audit: type=1800 audit(1539240430.527:26): pid=5627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.266627] audit: type=1800 audit(1539240430.527:27): pid=5627 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 '10.128.10.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.825297] kasan: CONFIG_KASAN_INLINE enabled [ 42.829946] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.837326] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.843561] CPU: 0 PID: 5780 Comm: syz-executor563 Not tainted 4.19.0-rc6+ #254 [ 42.850987] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.860336] RIP: 0010:rb_erase+0x306/0x3710 [ 42.864642] 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 [ 42.883538] RSP: 0018:ffff8801c4cbe918 EFLAGS: 00010202 [ 42.888884] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.896133] RDX: 1ffff10038997d2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 42.903382] RBP: ffff8801c4cbf320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 42.910631] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b93441f0 [ 42.917884] R13: dffffc0000000000 R14: ffff8801c4cbf2f8 R15: ffff8801c4cbf438 [ 42.925226] FS: 0000000001d0f880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 42.933439] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.939304] CR2: 0000000020000080 CR3: 00000001d7f53000 CR4: 00000000001406f0 [ 42.946559] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.953823] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.961072] Call Trace: [ 42.963646] ? rb_insert_color+0x1460/0x1460 [ 42.968136] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 42.973047] ? lock_downgrade+0x900/0x900 [ 42.977176] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.982954] ? mark_held_locks+0x130/0x130 [ 42.987182] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 42.992445] ? rcu_bh_qs+0xc0/0xc0 [ 42.995963] ? unwind_dump+0x190/0x190 [ 42.999934] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 43.005452] ? mark_held_locks+0x130/0x130 [ 43.009685] ? mark_page_accessed+0xcb0/0x2040 [ 43.014248] ? activate_page+0x1040/0x1040 [ 43.018463] ? activate_page+0x1040/0x1040 [ 43.022705] ? mark_held_locks+0x130/0x130 [ 43.026920] ? kasan_kmalloc+0xc7/0xe0 [ 43.030807] ? kmem_cache_alloc_trace+0x152/0x750 [ 43.035655] ? ima_add_digest_entry+0xcb/0x6a0 [ 43.040230] ? ima_add_template_entry+0x466/0x7f0 [ 43.045074] ? ima_store_template+0x224/0x310 [ 43.049574] ? pagecache_get_page+0x2d8/0xf00 [ 43.054052] ? find_get_pages_contig+0x15b0/0x15b0 [ 43.058966] ? is_bpf_text_address+0xac/0x170 [ 43.063446] ? lock_downgrade+0x900/0x900 [ 43.067583] ? mark_held_locks+0x130/0x130 [ 43.071816] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 43.077599] ? mark_held_locks+0x130/0x130 [ 43.081819] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 43.087163] ? lock_downgrade+0x900/0x900 [ 43.091295] ? kasan_check_read+0x11/0x20 [ 43.095433] ? do_raw_spin_unlock+0xa7/0x2f0 [ 43.099826] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 43.104402] ? mark_held_locks+0x130/0x130 [ 43.108630] ? _raw_spin_unlock+0x2c/0x50 [ 43.112762] ? ext4_discard_preallocations+0x18a/0x13c0 [ 43.118111] ? trace_hardirqs_on+0xbd/0x310 [ 43.122415] ? ext4_exit_mballoc+0xc0/0xc0 [ 43.126661] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 43.131660] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 43.136423] ? modules_open+0xa0/0xa0 [ 43.140208] ? __es_tree_search.isra.12+0x1ba/0x220 [ 43.145208] ? __es_remove_extent+0x9a3/0xba0 [ 43.149688] ? mark_held_locks+0x130/0x130 [ 43.153905] ? lock_downgrade+0x900/0x900 [ 43.158037] ? ext4_es_scan+0x960/0x960 [ 43.161995] ? lock_release+0x970/0x970 [ 43.165952] ? trace_hardirqs_on+0xbd/0x310 [ 43.170257] ? kasan_check_read+0x11/0x20 [ 43.174387] ? clear_inode+0x114/0x3a0 [ 43.178260] ? do_raw_write_trylock+0x1c0/0x1c0 [ 43.182913] ? kasan_check_write+0x14/0x20 [ 43.187316] ? lock_acquire+0x1ed/0x520 [ 43.191271] ? integrity_inode_free+0x77/0x320 [ 43.195837] ? ext4_es_remove_extent+0x151/0x500 [ 43.200578] ? lock_release+0x970/0x970 [ 43.204536] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 43.209622] ? depot_save_stack+0x292/0x470 [ 43.213926] ? kasan_check_write+0x14/0x20 [ 43.218157] ? do_raw_write_lock+0xbd/0x1b0 [ 43.222468] integrity_inode_free+0x12f/0x320 [ 43.226947] security_inode_free+0x19/0x90 [ 43.231166] __destroy_inode+0x328/0x820 [ 43.235226] ? generic_update_time+0x450/0x450 [ 43.239789] ? evict+0x5d8/0x980 [ 43.243165] ? lock_downgrade+0x900/0x900 [ 43.247298] ? __inode_wait_for_writeback+0x2cf/0x380 [ 43.252482] destroy_inode+0xda/0x200 [ 43.256280] ? __destroy_inode+0x820/0x820 [ 43.260499] ? kasan_check_write+0x14/0x20 [ 43.264714] ? do_raw_spin_lock+0xc1/0x200 [ 43.268928] evict+0x5e0/0x980 [ 43.272100] ? jbd2_journal_stop+0x430/0x15d0 [ 43.276584] ? destroy_inode+0x200/0x200 [ 43.280624] ? do_raw_spin_lock+0xc1/0x200 [ 43.284836] ? iput+0x671/0xa90 [ 43.288101] ? lock_downgrade+0x900/0x900 [ 43.292330] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 43.298020] ? kasan_check_read+0x11/0x20 [ 43.302147] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 43.306707] ? lock_downgrade+0x900/0x900 [ 43.310849] ? ext4_ioctl+0x231b/0x4210 [ 43.314804] iput+0x679/0xa90 [ 43.317913] ? inode_add_lru+0x2a0/0x2a0 [ 43.321953] ? up_write+0x7b/0x220 [ 43.325490] ? up_read+0x110/0x110 [ 43.329006] ? up_read+0x110/0x110 [ 43.332528] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.338057] ? check_preemption_disabled+0x48/0x200 [ 43.343065] ext4_ioctl+0x236f/0x4210 [ 43.346862] ? is_bpf_text_address+0xac/0x170 [ 43.351339] ? ext4_ioctl_group_add+0x560/0x560 [ 43.355987] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 43.361763] ? kasan_check_read+0x11/0x20 [ 43.365897] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 43.371149] ? rcu_bh_qs+0xc0/0xc0 [ 43.374665] ? unwind_dump+0x190/0x190 [ 43.378532] ? is_bpf_text_address+0xd3/0x170 [ 43.383005] ? kernel_text_address+0x79/0xf0 [ 43.387411] ? __kernel_text_address+0xd/0x40 [ 43.391910] ? unwind_get_return_address+0x61/0xa0 [ 43.396822] ? __save_stack_trace+0x8d/0xf0 [ 43.401125] ? save_stack+0xa9/0xd0 [ 43.404726] ? save_stack+0x43/0xd0 [ 43.408334] ? __kasan_slab_free+0x102/0x150 [ 43.412727] ? kasan_slab_free+0xe/0x10 [ 43.416695] ? kmem_cache_free+0x83/0x290 [ 43.420820] ? putname+0xf2/0x130 [ 43.424250] ? do_sys_open+0x54d/0x700 [ 43.428114] ? __x64_sys_openat+0x9d/0x100 [ 43.432327] ? do_syscall_64+0x1b9/0x820 [ 43.436367] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.441726] ? trace_hardirqs_off+0xb8/0x310 [ 43.446145] ? kasan_check_read+0x11/0x20 [ 43.450290] ? do_raw_spin_unlock+0xa7/0x2f0 [ 43.454680] ? trace_hardirqs_on+0x310/0x310 [ 43.459068] ? kasan_check_write+0x14/0x20 [ 43.463284] ? trace_hardirqs_off+0xb8/0x310 [ 43.467671] ? trace_hardirqs_on+0x310/0x310 [ 43.472062] ? ext4_ioctl_group_add+0x560/0x560 [ 43.476725] do_vfs_ioctl+0x1de/0x1720 [ 43.480597] ? trace_hardirqs_on+0xbd/0x310 [ 43.484907] ? ioctl_preallocate+0x300/0x300 [ 43.489311] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.494829] ? __fget_light+0x2e9/0x430 [ 43.498783] ? fget_raw+0x20/0x20 [ 43.502216] ? putname+0xf2/0x130 [ 43.505650] ? kmem_cache_free+0x21a/0x290 [ 43.509865] ? putname+0xf7/0x130 [ 43.513304] ? security_file_ioctl+0x94/0xc0 [ 43.517708] ksys_ioctl+0xa9/0xd0 [ 43.521167] __x64_sys_ioctl+0x73/0xb0 [ 43.525035] do_syscall_64+0x1b9/0x820 [ 43.528903] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 43.534246] ? syscall_return_slowpath+0x5e0/0x5e0 [ 43.539158] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.543984] ? trace_hardirqs_on_caller+0x310/0x310 [ 43.548980] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 43.553976] ? prepare_exit_to_usermode+0x291/0x3b0 [ 43.558974] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.563797] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.568966] RIP: 0033:0x440009 [ 43.572154] 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 [ 43.591124] RSP: 002b:00007fffc8f16398 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 43.598814] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 43.606063] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 43.613319] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 43.620564] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 43.627834] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 43.635093] Modules linked in: [ 43.638385] ---[ end trace 2ea91b9d3c276aa4 ]--- [ 43.643142] RIP: 0010:rb_erase+0x306/0x3710 [ 43.647540] 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 [ 43.666557] RSP: 0018:ffff8801c4cbe918 EFLAGS: 00010202 [ 43.671908] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 43.679267] RDX: 1ffff10038997d2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 43.686575] RBP: ffff8801c4cbf320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 43.693860] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b93441f0 [ 43.701135] R13: dffffc0000000000 R14: ffff8801c4cbf2f8 R15: ffff8801c4cbf438 [ 43.708410] FS: 0000000001d0f880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 43.716640] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.722511] CR2: 0000000020000080 CR3: 00000001d7f53000 CR4: 00000000001406f0 [ 43.729787] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.737089] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.744340] Kernel panic - not syncing: Fatal exception [ 43.750860] Kernel Offset: disabled [ 43.754497] Rebooting in 86400 seconds..