[....] Starting enhanced syslogd: rsyslogd[ 12.432286] audit: type=1400 audit(1516487535.261:5): avc: denied { syslog } for pid=3498 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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: [ 17.204154] audit: type=1400 audit(1516487540.032:6): avc: denied { map } for pid=3637 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 '10.128.15.243' (ECDSA) to the list of known hosts. [ 27.520892] audit: type=1400 audit(1516487550.349:7): avc: denied { map } for pid=3653 comm="syzkaller907222" path="/root/syzkaller907222955" 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 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz3.router_solicitations = 0 RTNETLINK answers: Operation not supported [ 27.917780] ip (3712) used greatest stack depth: 16480 bytes left net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz7.router_solicitations = 0 RTNETLINK answers: No buffer space available [ 27.996634] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz1.router_solicitations = 0 RTNETLINK answers: Operation not supported net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz2.router_solicitations = 0 [ 28.329634] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready net.ipv6.conf.syz0.accept_dad = 0 RTNETLINK answers: No buffer space available net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz6.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported net.ipv6.conf.syz4.accept_dad = 0 RTNETLINK answers: Operation not supported net.ipv6.conf.syz4.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument [ 28.935311] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported [ 29.152889] ip (4029) used greatest stack depth: 15840 bytes left RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument [ 29.236501] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported [ 29.358758] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 29.421399] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: No buffer space available RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 29.542435] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 29.611526] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 29.631745] audit: type=1400 audit(1516487552.460:8): avc: denied { sys_admin } for pid=3659 comm="syzkaller907222" capability=21 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 executing program RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported executing program RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 29.670472] audit: type=1400 audit(1516487552.496:9): avc: denied { sys_chroot } for pid=4259 comm="syzkaller907222" capability=18 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 RTNETLINK answers: Operation not supported executing program RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument executing program RTNETLINK answers: Operation not supported executing program RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported executing program RTNETLINK answers: Invalid argument RTNETLINK answers: Operation not supported executing program RTNETLINK answers: Invalid argument executing program executing program RTNETLINK answers: Invalid argument executing program RTNETLINK answers: Operation not supported executing program executing program RTNETLINK answers: Invalid argument executing program RTNETLINK answers: Invalid argument executing program RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported executing program executing program executing program RTNETLINK answers: Invalid argument executing program RTNETLINK answers: Invalid argument executing program RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program RTNETLINK answers: Invalid argument executing program executing program executing program executing program RTNETLINK answers: Invalid argument executing program executing program executing program executing program RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program executing program RTNETLINK answers: Invalid argument executing program executing program executing program RTNETLINK answers: Invalid argument executing program executing program executing program executing program RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 39.101597] ================================================================== [ 39.109033] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 39.115699] Read of size 8 at addr ffff8801c8612020 by task syzkaller907222/11241 [ 39.123301] [ 39.124916] CPU: 0 PID: 11241 Comm: syzkaller907222 Not tainted 4.15.0-rc8+ #270 [ 39.132435] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.141762] Call Trace: [ 39.144328] dump_stack+0x194/0x257 [ 39.147932] ? arch_local_irq_restore+0x53/0x53 [ 39.152571] ? show_regs_print_info+0x18/0x18 [ 39.157045] ? check_noncircular+0x20/0x20 [ 39.161259] ? __lock_acquire+0x3d4d/0x3e00 [ 39.165562] print_address_description+0x73/0x250 [ 39.170379] ? __lock_acquire+0x3d4d/0x3e00 [ 39.174670] kasan_report+0x25b/0x340 [ 39.178440] __asan_report_load8_noabort+0x14/0x20 [ 39.183342] __lock_acquire+0x3d4d/0x3e00 [ 39.187462] ? check_noncircular+0x20/0x20 [ 39.191666] ? remove_wait_queue+0x81/0x350 [ 39.195963] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 39.201122] ? lock_downgrade+0x980/0x980 [ 39.205241] ? __schedule+0x2060/0x2060 [ 39.209186] ? find_held_lock+0x35/0x1d0 [ 39.213216] ? wait_for_completion+0xe0/0x770 [ 39.217678] ? lock_downgrade+0x980/0x980 [ 39.221795] ? lock_release+0xa40/0xa40 [ 39.225739] ? usleep_range+0x190/0x190 [ 39.229681] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 39.235535] ? kasan_slab_free+0x71/0xc0 [ 39.239568] ? do_raw_spin_trylock+0x190/0x190 [ 39.244121] ? _raw_spin_unlock_irq+0x27/0x70 [ 39.248589] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.253573] ? trace_hardirqs_on+0xd/0x10 [ 39.257692] ? _raw_spin_unlock_irq+0x27/0x70 [ 39.262156] ? wait_for_completion+0xe0/0x770 [ 39.266626] ? wait_for_completion_interruptible+0x7e0/0x7e0 [ 39.272405] ? __lockdep_init_map+0xe4/0x650 [ 39.276793] ? llist_add_batch+0xf3/0x180 [ 39.280911] lock_acquire+0x1d5/0x580 [ 39.284679] ? lock_acquire+0x1d5/0x580 [ 39.288620] ? remove_wait_queue+0x81/0x350 [ 39.292910] ? wake_up_process+0x10/0x20 [ 39.296945] ? lock_release+0xa40/0xa40 [ 39.300891] ? vhost_work_queue+0xc0/0xc0 [ 39.305009] ? vhost_poll_stop+0x90/0x90 [ 39.309054] ? wait_for_completion+0x770/0x770 [ 39.313606] _raw_spin_lock_irqsave+0x96/0xc0 [ 39.318071] ? remove_wait_queue+0x81/0x350 [ 39.322359] remove_wait_queue+0x81/0x350 [ 39.326476] ? add_wait_queue+0x290/0x290 [ 39.330602] ? vhost_poll_flush+0x3f/0x60 [ 39.334729] ? vhost_net_flush+0x209/0x2a0 [ 39.338939] vhost_dev_stop+0x15c/0x2a0 [ 39.342886] ? vhost_net_compat_ioctl+0x30/0x30 [ 39.347523] vhost_net_release+0x6e/0x190 [ 39.351640] __fput+0x327/0x7e0 [ 39.354891] ? fput+0x140/0x140 [ 39.358139] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 39.363994] ? _raw_spin_unlock_irq+0x27/0x70 [ 39.368461] ____fput+0x15/0x20 [ 39.371710] task_work_run+0x199/0x270 [ 39.375566] ? task_work_cancel+0x210/0x210 [ 39.379855] ? _raw_spin_unlock+0x22/0x30 [ 39.383974] ? switch_task_namespaces+0x87/0xc0 [ 39.388611] do_exit+0x9bb/0x1ad0 [ 39.392057] ? mm_update_next_owner+0x930/0x930 [ 39.396705] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 39.401867] ? __might_sleep+0x95/0x190 [ 39.405811] ? find_held_lock+0x35/0x1d0 [ 39.409844] ? futex_wait+0x402/0x9a0 [ 39.413618] ? lock_downgrade+0x980/0x980 [ 39.417734] ? __unqueue_futex+0x1c0/0x290 [ 39.421938] ? lock_release+0xa40/0xa40 [ 39.425885] ? fault_in_user_writeable+0x90/0x90 [ 39.430611] ? do_raw_spin_trylock+0x190/0x190 [ 39.435162] ? futex_wake+0x680/0x680 [ 39.438936] ? check_noncircular+0x20/0x20 [ 39.443142] ? drop_futex_key_refs.isra.12+0x63/0xb0 [ 39.448213] ? futex_wait+0x6a9/0x9a0 [ 39.451998] ? find_held_lock+0x35/0x1d0 [ 39.456044] ? get_signal+0x7ae/0x16c0 [ 39.459905] ? lock_downgrade+0x980/0x980 [ 39.464029] do_group_exit+0x149/0x400 [ 39.467893] ? do_raw_spin_trylock+0x190/0x190 [ 39.472443] ? SyS_exit+0x30/0x30 [ 39.475870] ? _raw_spin_unlock_irq+0x27/0x70 [ 39.480337] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.485323] get_signal+0x73f/0x16c0 [ 39.489015] ? ptrace_notify+0x130/0x130 [ 39.493054] ? exit_robust_list+0x240/0x240 [ 39.497354] ? avc_has_extended_perms+0x7fa/0x12c0 [ 39.502254] ? find_held_lock+0x35/0x1d0 [ 39.506285] ? vhost_net_stop_vq+0xf0/0xf0 [ 39.510491] ? avc_ss_reset+0x110/0x110 [ 39.514436] ? lock_downgrade+0x980/0x980 [ 39.518561] do_signal+0x90/0x1eb0 [ 39.522080] ? __lock_is_held+0xb6/0x140 [ 39.526111] ? setup_sigcontext+0x7d0/0x7d0 [ 39.530407] ? up_read+0x1a/0x40 [ 39.533743] ? rcu_note_context_switch+0x710/0x710 [ 39.538649] ? exit_to_usermode_loop+0x8c/0x310 [ 39.543288] exit_to_usermode_loop+0x214/0x310 [ 39.547840] ? ioctl_preallocate+0x2b0/0x2b0 [ 39.552220] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 39.557725] ? selinux_capable+0x40/0x40 [ 39.561759] syscall_return_slowpath+0x490/0x550 [ 39.566484] ? prepare_exit_to_usermode+0x340/0x340 [ 39.571472] ? entry_SYSCALL_64_fastpath+0x73/0xa0 [ 39.576378] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.581362] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 39.586088] entry_SYSCALL_64_fastpath+0x9e/0xa0 [ 39.590811] RIP: 0033:0x44bd19 [ 39.593975] RSP: 002b:00007f9a25933cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 39.601658] RAX: fffffffffffffe00 RBX: 00000000006f0054 RCX: 000000000044bd19 [ 39.608902] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006f0054 [ 39.616140] RBP: 00000000006f0050 R08: 0000000000000000 R09: 0000000000000000 [ 39.623380] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 39.630619] R13: 00000000007ff93f R14: 00007f9a259349c0 R15: 0000000000000007 [ 39.637862] [ 39.639462] Allocated by task 11224: [ 39.643165] save_stack+0x43/0xd0 [ 39.646593] kasan_kmalloc+0xad/0xe0 [ 39.650278] kmem_cache_alloc_trace+0x136/0x750 [ 39.654924] eventfd_file_create.part.3+0x96/0x250 [ 39.659824] SyS_eventfd+0x2c/0x80 [ 39.663342] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 39.668069] [ 39.669665] Freed by task 11241: [ 39.673003] save_stack+0x43/0xd0 [ 39.676436] kasan_slab_free+0x71/0xc0 [ 39.680296] kfree+0xd6/0x260 [ 39.683369] eventfd_ctx_put+0x26/0x30 [ 39.687227] eventfd_release+0x52/0x60 [ 39.691082] __fput+0x327/0x7e0 [ 39.694333] ____fput+0x15/0x20 [ 39.697584] task_work_run+0x199/0x270 [ 39.701443] do_exit+0x9bb/0x1ad0 [ 39.704869] do_group_exit+0x149/0x400 [ 39.708725] get_signal+0x73f/0x16c0 [ 39.712417] do_signal+0x90/0x1eb0 [ 39.715935] exit_to_usermode_loop+0x214/0x310 [ 39.720487] syscall_return_slowpath+0x490/0x550 [ 39.725209] entry_SYSCALL_64_fastpath+0x9e/0xa0 [ 39.729933] [ 39.731533] The buggy address belongs to the object at ffff8801c8612000 [ 39.731533] which belongs to the cache kmalloc-96 of size 96 [ 39.743983] The buggy address is located 32 bytes inside of [ 39.743983] 96-byte region [ffff8801c8612000, ffff8801c8612060) [ 39.755651] The buggy address belongs to the page: [ 39.760549] page:ffffea0007218480 count:1 mapcount:0 mapping:ffff8801c8612000 index:0x0 [ 39.768658] flags: 0x2fffc0000000100(slab) [ 39.772862] raw: 02fffc0000000100 ffff8801c8612000 0000000000000000 0000000100000020 [ 39.780714] raw: ffffea000740b3a0 ffffea00072526a0 ffff8801dac004c0 0000000000000000 [ 39.788564] page dumped because: kasan: bad access detected [ 39.794242] [ 39.795838] Memory state around the buggy address: [ 39.800737] ffff8801c8611f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 39.808072] ffff8801c8611f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 39.815413] >ffff8801c8612000: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 39.822739] ^ [ 39.827115] ffff8801c8612080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 39.834449] ffff8801c8612100: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 39.841781] ================================================================== [ 39.849107] Disabling lock debugging due to kernel taint [ 39.854526] Kernel panic - not syncing: panic_on_warn set ... [ 39.854526] [ 39.861858] CPU: 0 PID: 11241 Comm: syzkaller907222 Tainted: G B 4.15.0-rc8+ #270 [ 39.870662] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.879986] Call Trace: [ 39.882548] dump_stack+0x194/0x257 [ 39.886149] ? arch_local_irq_restore+0x53/0x53 [ 39.890788] ? kasan_end_report+0x32/0x50 [ 39.895288] ? lock_downgrade+0x980/0x980 [ 39.899411] ? vsnprintf+0x1ed/0x1900 [ 39.903189] ? __lock_acquire+0x3d40/0x3e00 [ 39.907487] panic+0x1e4/0x41c [ 39.910652] ? refcount_error_report+0x214/0x214 [ 39.915380] ? add_taint+0x40/0x50 [ 39.918888] ? add_taint+0x1c/0x50 [ 39.922407] ? __lock_acquire+0x3d4d/0x3e00 [ 39.926701] kasan_end_report+0x50/0x50 [ 39.930645] kasan_report+0x144/0x340 [ 39.934420] __asan_report_load8_noabort+0x14/0x20 [ 39.939324] __lock_acquire+0x3d4d/0x3e00 [ 39.943447] ? check_noncircular+0x20/0x20 [ 39.947653] ? remove_wait_queue+0x81/0x350 [ 39.951952] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 39.957110] ? lock_downgrade+0x980/0x980 [ 39.961228] ? __schedule+0x2060/0x2060 [ 39.965177] ? find_held_lock+0x35/0x1d0 [ 39.969213] ? wait_for_completion+0xe0/0x770 [ 39.973675] ? lock_downgrade+0x980/0x980 [ 39.977794] ? lock_release+0xa40/0xa40 [ 39.981740] ? usleep_range+0x190/0x190 [ 39.985685] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 39.991542] ? kasan_slab_free+0x71/0xc0 [ 39.995574] ? do_raw_spin_trylock+0x190/0x190 [ 40.000124] ? _raw_spin_unlock_irq+0x27/0x70 [ 40.004588] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 40.009577] ? trace_hardirqs_on+0xd/0x10 [ 40.013703] ? _raw_spin_unlock_irq+0x27/0x70 [ 40.018182] ? wait_for_completion+0xe0/0x770 [ 40.022654] ? wait_for_completion_interruptible+0x7e0/0x7e0 [ 40.028421] ? __lockdep_init_map+0xe4/0x650 [ 40.032799] ? llist_add_batch+0xf3/0x180 [ 40.036930] lock_acquire+0x1d5/0x580 [ 40.040703] ? lock_acquire+0x1d5/0x580 [ 40.044649] ? remove_wait_queue+0x81/0x350 [ 40.048947] ? wake_up_process+0x10/0x20 [ 40.052982] ? lock_release+0xa40/0xa40 [ 40.056932] ? vhost_work_queue+0xc0/0xc0 [ 40.061058] ? vhost_poll_stop+0x90/0x90 [ 40.065091] ? wait_for_completion+0x770/0x770 [ 40.069642] _raw_spin_lock_irqsave+0x96/0xc0 [ 40.074107] ? remove_wait_queue+0x81/0x350 [ 40.078396] remove_wait_queue+0x81/0x350 [ 40.082511] ? add_wait_queue+0x290/0x290 [ 40.086627] ? vhost_poll_flush+0x3f/0x60 [ 40.090742] ? vhost_net_flush+0x209/0x2a0 [ 40.094952] vhost_dev_stop+0x15c/0x2a0 [ 40.098898] ? vhost_net_compat_ioctl+0x30/0x30 [ 40.103537] vhost_net_release+0x6e/0x190 [ 40.107656] __fput+0x327/0x7e0 [ 40.110908] ? fput+0x140/0x140 [ 40.114159] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 40.120015] ? _raw_spin_unlock_irq+0x27/0x70 [ 40.124488] ____fput+0x15/0x20 [ 40.127738] task_work_run+0x199/0x270 [ 40.131605] ? task_work_cancel+0x210/0x210 [ 40.135898] ? _raw_spin_unlock+0x22/0x30 [ 40.140020] ? switch_task_namespaces+0x87/0xc0 [ 40.144662] do_exit+0x9bb/0x1ad0 [ 40.148084] ? mm_update_next_owner+0x930/0x930 [ 40.152724] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 40.157882] ? __might_sleep+0x95/0x190 [ 40.161826] ? find_held_lock+0x35/0x1d0 [ 40.165863] ? futex_wait+0x402/0x9a0 [ 40.169633] ? lock_downgrade+0x980/0x980 [ 40.173749] ? __unqueue_futex+0x1c0/0x290 [ 40.177952] ? lock_release+0xa40/0xa40 [ 40.181896] ? fault_in_user_writeable+0x90/0x90 [ 40.186629] ? do_raw_spin_trylock+0x190/0x190 [ 40.191178] ? futex_wake+0x680/0x680 [ 40.194947] ? check_noncircular+0x20/0x20 [ 40.199151] ? drop_futex_key_refs.isra.12+0x63/0xb0 [ 40.204224] ? futex_wait+0x6a9/0x9a0 [ 40.207994] ? find_held_lock+0x35/0x1d0 [ 40.212034] ? get_signal+0x7ae/0x16c0 [ 40.215894] ? lock_downgrade+0x980/0x980 [ 40.220018] do_group_exit+0x149/0x400 [ 40.223879] ? do_raw_spin_trylock+0x190/0x190 [ 40.228430] ? SyS_exit+0x30/0x30 [ 40.231854] ? _raw_spin_unlock_irq+0x27/0x70 [ 40.236320] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 40.241303] get_signal+0x73f/0x16c0 [ 40.244988] ? ptrace_notify+0x130/0x130 [ 40.249043] ? exit_robust_list+0x240/0x240 [ 40.253335] ? avc_has_extended_perms+0x7fa/0x12c0 [ 40.258230] ? find_held_lock+0x35/0x1d0 [ 40.262262] ? vhost_net_stop_vq+0xf0/0xf0 [ 40.266467] ? avc_ss_reset+0x110/0x110 [ 40.270409] ? lock_downgrade+0x980/0x980 [ 40.274534] do_signal+0x90/0x1eb0 [ 40.278051] ? __lock_is_held+0xb6/0x140 [ 40.282090] ? setup_sigcontext+0x7d0/0x7d0 [ 40.286401] ? up_read+0x1a/0x40 [ 40.289741] ? rcu_note_context_switch+0x710/0x710 [ 40.294640] ? exit_to_usermode_loop+0x8c/0x310 [ 40.299279] exit_to_usermode_loop+0x214/0x310 [ 40.303834] ? ioctl_preallocate+0x2b0/0x2b0 [ 40.308223] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 40.313737] ? selinux_capable+0x40/0x40 [ 40.317773] syscall_return_slowpath+0x490/0x550 [ 40.322501] ? prepare_exit_to_usermode+0x340/0x340 [ 40.327487] ? entry_SYSCALL_64_fastpath+0x73/0xa0 [ 40.332384] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 40.337377] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 40.342104] entry_SYSCALL_64_fastpath+0x9e/0xa0 [ 40.346829] RIP: 0033:0x44bd19 [ 40.349986] RSP: 002b:00007f9a25933cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 40.357665] RAX: fffffffffffffe00 RBX: 00000000006f0054 RCX: 000000000044bd19 [ 40.364906] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006f0054 [ 40.372147] RBP: 00000000006f0050 R08: 0000000000000000 R09: 0000000000000000 [ 40.379385] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 40.386624] R13: 00000000007ff93f R14: 00007f9a259349c0 R15: 0000000000000007 [ 40.393913] Dumping ftrace buffer: [ 40.397426] (ftrace buffer empty) [ 40.401111] Kernel Offset: disabled [ 40.404704] Rebooting in 86400 seconds..