[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 41.098080] kauditd_printk_skb: 9 callbacks suppressed [ 41.098094] audit: type=1400 audit(1539056085.855:35): avc: denied { map } for pid=5904 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. executing program [ 47.720562] audit: type=1400 audit(1539056092.475:36): avc: denied { map } for pid=5916 comm="syz-executor027" path="/root/syz-executor027453186" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 47.724733] kasan: CONFIG_KASAN_INLINE enabled [ 47.751427] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.758891] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.765113] CPU: 1 PID: 5916 Comm: syz-executor027 Not tainted 4.19.0-rc7+ #53 [ 47.772451] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.781934] RIP: 0010:rb_erase+0x306/0x3710 [ 47.786241] 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 [ 47.805123] RSP: 0018:ffff8801c3c06918 EFLAGS: 00010202 [ 47.810466] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.817720] RDX: 1ffff10038780d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 47.824970] RBP: ffff8801c3c07320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 47.832232] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b7f103f0 [ 47.839486] R13: dffffc0000000000 R14: ffff8801c3c072f8 R15: ffff8801c3c07438 [ 47.846740] FS: 0000000000a68880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 47.854945] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.860802] CR2: 0000000020000380 CR3: 00000001c8a8f000 CR4: 00000000001406e0 [ 47.868056] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.875308] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.882553] Call Trace: [ 47.885127] ? rb_insert_color+0x1460/0x1460 [ 47.889520] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 47.894444] ? mark_held_locks+0x130/0x130 [ 47.898677] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.904458] ? mark_held_locks+0x130/0x130 [ 47.908678] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.913953] ? mark_held_locks+0x130/0x130 [ 47.918196] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.923721] ? mark_held_locks+0x130/0x130 [ 47.927938] ? mark_page_accessed+0xcb0/0x2040 [ 47.932500] ? activate_page+0x1040/0x1040 [ 47.936715] ? activate_page+0x1040/0x1040 [ 47.940956] ? mark_held_locks+0x130/0x130 [ 47.945196] ? find_get_pages_contig+0x15b0/0x15b0 [ 47.950112] ? lock_downgrade+0x900/0x900 [ 47.954240] ? mark_held_locks+0x130/0x130 [ 47.958459] ? mark_held_locks+0x130/0x130 [ 47.962691] ? depot_save_stack+0x292/0x470 [ 47.966999] ? mark_held_locks+0x130/0x130 [ 47.971223] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 47.976568] ? lock_downgrade+0x900/0x900 [ 47.980699] ? kasan_check_read+0x11/0x20 [ 47.984828] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.989221] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.993783] ? mark_held_locks+0x130/0x130 [ 47.998002] ? _raw_spin_unlock+0x2c/0x50 [ 48.002139] ? ext4_discard_preallocations+0x18a/0x13c0 [ 48.007502] ? ext4_exit_mballoc+0xc0/0xc0 [ 48.011736] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.016735] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 48.021474] ? modules_open+0xa0/0xa0 [ 48.025262] ? __es_tree_search.isra.12+0x1ba/0x220 [ 48.030257] ? __es_remove_extent+0x9a3/0xba0 [ 48.034736] ? mark_held_locks+0x130/0x130 [ 48.038951] ? lock_downgrade+0x900/0x900 [ 48.043079] ? ext4_es_scan+0x960/0x960 [ 48.047034] ? lock_release+0x970/0x970 [ 48.050993] ? trace_hardirqs_on+0xbd/0x310 [ 48.055310] ? kasan_check_read+0x11/0x20 [ 48.059436] ? clear_inode+0x114/0x3a0 [ 48.063306] ? do_raw_write_trylock+0x1c0/0x1c0 [ 48.067972] ? kasan_check_write+0x14/0x20 [ 48.072208] ? lock_acquire+0x1ed/0x520 [ 48.076172] ? integrity_inode_free+0x77/0x320 [ 48.080731] ? ext4_es_remove_extent+0x151/0x500 [ 48.085467] ? lock_release+0x970/0x970 [ 48.089426] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 48.094512] ? depot_save_stack+0x292/0x470 [ 48.098815] ? kasan_check_write+0x14/0x20 [ 48.103031] ? do_raw_write_lock+0xbd/0x1b0 [ 48.107344] integrity_inode_free+0x12f/0x320 [ 48.111822] security_inode_free+0x19/0x90 [ 48.116053] __destroy_inode+0x328/0x820 [ 48.120091] ? generic_update_time+0x450/0x450 [ 48.124652] ? evict+0x5d8/0x980 [ 48.127999] ? lock_downgrade+0x900/0x900 [ 48.132125] ? __inode_wait_for_writeback+0x2cf/0x380 [ 48.137296] destroy_inode+0xda/0x200 [ 48.141078] ? __destroy_inode+0x820/0x820 [ 48.145294] ? kasan_check_write+0x14/0x20 [ 48.149510] ? do_raw_spin_lock+0xc1/0x200 [ 48.153726] evict+0x5e0/0x980 [ 48.156896] ? jbd2_journal_stop+0x430/0x15d0 [ 48.161371] ? destroy_inode+0x200/0x200 [ 48.165417] ? do_raw_spin_lock+0xc1/0x200 [ 48.169628] ? iput+0x671/0xa90 [ 48.172888] ? lock_downgrade+0x900/0x900 [ 48.177020] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.182562] ? kasan_check_read+0x11/0x20 [ 48.186739] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.191301] ? lock_downgrade+0x900/0x900 [ 48.195429] ? ext4_ioctl+0x231b/0x4210 [ 48.199383] iput+0x679/0xa90 [ 48.202469] ? inode_add_lru+0x2a0/0x2a0 [ 48.206514] ? up_write+0x7b/0x220 [ 48.210031] ? up_read+0x110/0x110 [ 48.213546] ? up_read+0x110/0x110 [ 48.217069] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.222583] ? check_preemption_disabled+0x48/0x200 [ 48.227599] ext4_ioctl+0x236f/0x4210 [ 48.231379] ? ext4_ioctl_group_add+0x560/0x560 [ 48.236033] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.241809] ? kasan_check_read+0x11/0x20 [ 48.245938] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.251197] ? unwind_dump+0x190/0x190 [ 48.255093] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.260622] ? avc_has_extended_perms+0xab2/0x15a0 [ 48.265542] ? fpu__prepare_read+0x17/0x750 [ 48.269841] ? avc_ss_reset+0x190/0x190 [ 48.273795] ? save_stack+0xa9/0xd0 [ 48.277402] ? save_stack+0x43/0xd0 [ 48.281010] ? __kasan_slab_free+0x102/0x150 [ 48.285546] ? kasan_slab_free+0xe/0x10 [ 48.289497] ? kmem_cache_free+0x83/0x290 [ 48.293623] ? putname+0xf2/0x130 [ 48.297057] ? do_sys_open+0x54d/0x700 [ 48.300920] ? __x64_sys_openat+0x9d/0x100 [ 48.305153] ? do_syscall_64+0x1b9/0x820 [ 48.309195] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.314573] ? trace_hardirqs_off+0xb8/0x310 [ 48.318998] ? kasan_check_read+0x11/0x20 [ 48.323125] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.327518] ? ___might_sleep+0x1ed/0x300 [ 48.331649] ? arch_local_save_flags+0x40/0x40 [ 48.336220] ? kasan_check_write+0x14/0x20 [ 48.340456] ? trace_hardirqs_off+0xb8/0x310 [ 48.344855] ? ext4_ioctl_group_add+0x560/0x560 [ 48.349507] do_vfs_ioctl+0x1de/0x1720 [ 48.353390] ? ioctl_preallocate+0x300/0x300 [ 48.357780] ? selinux_file_mprotect+0x620/0x620 [ 48.362516] ? putname+0xf2/0x130 [ 48.365950] ? kmem_cache_free+0x21a/0x290 [ 48.370166] ? putname+0xf7/0x130 [ 48.373602] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.379118] ? security_file_ioctl+0x94/0xc0 [ 48.383506] ksys_ioctl+0xa9/0xd0 [ 48.386941] __x64_sys_ioctl+0x73/0xb0 [ 48.390807] do_syscall_64+0x1b9/0x820 [ 48.394674] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 48.400017] ? syscall_return_slowpath+0x5e0/0x5e0 [ 48.404926] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.409749] ? trace_hardirqs_on_caller+0x310/0x310 [ 48.414808] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 48.419805] ? prepare_exit_to_usermode+0x291/0x3b0 [ 48.424802] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.429627] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.434794] RIP: 0033:0x440009 [ 48.437969] 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 [ 48.456869] RSP: 002b:00007ffdfa74fda8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 48.464558] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 48.471804] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 48.479054] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 48.486302] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 48.493552] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 48.500804] Modules linked in: [ 48.504088] ---[ end trace 04c595bacaafe7e2 ]--- [ 48.508950] RIP: 0010:rb_erase+0x306/0x3710 [ 48.513265] 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 [ 48.532174] RSP: 0018:ffff8801c3c06918 EFLAGS: 00010202 [ 48.537574] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.544855] RDX: 1ffff10038780d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 48.552123] RBP: ffff8801c3c07320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 48.559437] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b7f103f0 [ 48.566721] R13: dffffc0000000000 R14: ffff8801c3c072f8 R15: ffff8801c3c07438 [ 48.573992] FS: 0000000000a68880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 48.582237] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.588154] CR2: 0000000020000380 CR3: 00000001c8a8f000 CR4: 00000000001406e0 [ 48.595451] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.602705] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.609986] Kernel panic - not syncing: Fatal exception [ 48.616209] Kernel Offset: disabled [ 48.619858] Rebooting in 86400 seconds..