[ 40.835117] audit: type=1800 audit(1555990605.230:29): pid=7637 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 40.879890] audit: type=1800 audit(1555990605.230:30): pid=7637 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.133' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 54.018380] kauditd_printk_skb: 5 callbacks suppressed [ 54.018397] audit: type=1400 audit(1555990618.410:36): avc: denied { map } for pid=7822 comm="syz-executor726" path="/root/syz-executor726381311" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 54.082877] kobject_add_internal failed for hci2 (error: -2 parent: bluetooth) [ 54.100098] Bluetooth: Can't register HCI device executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 54.219614] kobject_add_internal failed for hci1 (error: -2 parent: bluetooth) [ 54.240376] Bluetooth: Can't register HCI device executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 55.233579] kobject_add_internal failed for hci1 (error: -2 parent: bluetooth) [ 55.257104] Bluetooth: Can't register HCI device executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 56.031634] kobject_add_internal failed for hci2 (error: -2 parent: bluetooth) [ 56.070497] Bluetooth: Can't register HCI device executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.934662] kobject_add_internal failed for hci3 (error: -2 parent: bluetooth) [ 57.968774] Bluetooth: Can't register HCI device [ 57.975208] ------------[ cut here ]------------ executing program [ 57.980129] refcount_t: increment on 0; use-after-free. [ 57.988105] WARNING: CPU: 0 PID: 8589 at lib/refcount.c:153 refcount_inc_checked+0x61/0x70 [ 57.996544] Kernel panic - not syncing: panic_on_warn set ... [ 57.996544] [ 58.003928] CPU: 0 PID: 8589 Comm: syz-executor726 Not tainted 4.19.36 #4 [ 58.010865] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.020228] Call Trace: [ 58.022920] dump_stack+0x172/0x1f0 [ 58.026668] panic+0x263/0x51d [ 58.029881] ? __warn_printk+0xf3/0xf3 [ 58.033795] ? refcount_inc_checked+0x61/0x70 [ 58.038303] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 58.043857] ? __warn.cold+0x5/0x54 [ 58.047501] ? __warn+0xe8/0x1d0 [ 58.050887] ? refcount_inc_checked+0x61/0x70 [ 58.055401] __warn.cold+0x20/0x54 [ 58.058964] ? refcount_inc_checked+0x61/0x70 [ 58.063484] report_bug+0x263/0x2b0 [ 58.067156] do_error_trap+0x204/0x360 [ 58.071070] ? math_error+0x340/0x340 [ 58.075065] ? wake_up_klogd+0x99/0xd0 [ 58.078967] ? vprintk_emit+0x264/0x690 executing program [ 58.082975] ? vprintk_emit+0x1ab/0x690 [ 58.086965] ? error_entry+0x76/0xd0 [ 58.090700] ? trace_hardirqs_off_caller+0x65/0x220 [ 58.095912] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 58.100772] do_invalid_op+0x1b/0x20 [ 58.104507] invalid_op+0x14/0x20 [ 58.107974] RIP: 0010:refcount_inc_checked+0x61/0x70 [ 58.113087] Code: 1d 49 4d 12 06 31 ff 89 de e8 2b 9f 47 fe 84 db 75 dd e8 e2 9d 47 fe 48 c7 c7 c0 84 81 87 c6 05 29 4d 12 06 01 e8 fd 79 1b fe <0f> 0b eb c1 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 executing program [ 58.132005] RSP: 0018:ffff88809f597928 EFLAGS: 00010282 [ 58.137484] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 58.144768] RDX: 0000000000000000 RSI: ffffffff8155df26 RDI: ffffed1013eb2f17 [ 58.152061] RBP: ffff88809f597938 R08: ffff88808c586240 R09: ffffed1015d03ee3 [ 58.159348] R10: ffffed1015d03ee2 R11: ffff8880ae81f717 R12: ffff88821ae0ddf8 [ 58.166637] R13: ffff88808cfe6820 R14: ffff88808cfe6818 R15: ffff88821ae0dd78 [ 58.173961] ? vprintk_func+0x86/0x189 [ 58.177872] ? refcount_inc_checked+0x61/0x70 [ 58.182385] kobject_get+0x66/0xc0 [ 58.185948] kobject_add_internal+0x14f/0x380 [ 58.190571] ? kfree_const+0x5e/0x70 [ 58.194305] kobject_add+0x150/0x1c0 [ 58.198044] ? kset_create_and_add+0x1a0/0x1a0 [ 58.202645] ? rcu_read_lock_sched_held+0x110/0x130 [ 58.207695] ? kmem_cache_alloc_trace+0x34b/0x760 [ 58.212559] get_device_parent.isra.0+0x415/0x570 [ 58.217515] device_add+0x2f4/0x1770 [ 58.221242] ? device_initialize+0x440/0x440 [ 58.225685] ? get_device_parent.isra.0+0x570/0x570 [ 58.230721] ? start_creating+0x163/0x1e0 [ 58.234914] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 58.240480] hci_register_dev+0x304/0x880 [ 58.244670] __vhci_create_device+0x2d0/0x5a0 [ 58.249184] vhci_write+0x2d6/0x470 [ 58.252828] __vfs_write+0x58e/0x820 [ 58.256556] ? kernel_read+0x120/0x120 [ 58.260464] ? __inode_security_revalidate+0xda/0x120 [ 58.265684] ? selinux_file_permission+0x92/0x550 [ 58.270557] ? security_file_permission+0x8f/0x230 [ 58.275507] ? rw_verify_area+0x118/0x360 [ 58.279685] vfs_write+0x20c/0x560 [ 58.283245] ksys_write+0xea/0x1f0 [ 58.289286] ? __ia32_sys_read+0xb0/0xb0 [ 58.293365] ? do_syscall_64+0x26/0x610 [ 58.297357] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.302770] ? do_syscall_64+0x26/0x610 [ 58.306765] __x64_sys_write+0x73/0xb0 [ 58.310685] do_syscall_64+0x103/0x610 [ 58.314604] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 58.319806] RIP: 0033:0x441269 [ 58.323012] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 58.342054] RSP: 002b:00007ffd720c2d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 58.350830] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441269 [ 58.358116] RDX: 0000000000000002 RSI: 00000000200000c0 RDI: 0000000000000003 [ 58.365397] RBP: 000000000000e232 R08: 00000000004002c8 R09: 00000000004002c8 [ 58.372689] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000401fe0 [ 58.379990] R13: 0000000000402070 R14: 0000000000000000 R15: 0000000000000000 [ 58.388204] Kernel Offset: disabled [ 58.392062] Rebooting in 86400 seconds..