INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 'ci-upstream-kasan-gce-4,10.128.15.195' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 58.691907] dev_remove_pack: ffff8801d3557c80 not found executing program executing program [ 58.798415] ================================================================== [ 58.805852] BUG: KASAN: use-after-free in fanout_demux_rollover+0x49b/0x4d0 [ 58.812944] Read of size 8 at addr ffff8801d3557c30 by task syzkaller133442/10027 [ 58.820548] [ 58.822156] CPU: 1 PID: 10027 Comm: syzkaller133442 Not tainted 4.13.0+ #79 [ 58.829231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.838572] Call Trace: [ 58.841130] [ 58.843256] dump_stack+0x194/0x257 [ 58.846867] ? arch_local_irq_restore+0x53/0x53 [ 58.851520] ? show_regs_print_info+0x65/0x65 [ 58.856021] ? fanout_demux_rollover+0x49b/0x4d0 [ 58.860763] print_address_description+0x73/0x250 [ 58.865583] ? fanout_demux_rollover+0x49b/0x4d0 [ 58.870311] kasan_report+0x24e/0x340 [ 58.874089] __asan_report_load8_noabort+0x14/0x20 [ 58.878992] fanout_demux_rollover+0x49b/0x4d0 [ 58.883548] ? skb_split+0x1310/0x1310 [ 58.887416] packet_rcv_fanout+0x52e/0x7d0 [ 58.891633] ? compat_packet_setsockopt+0x140/0x140 [ 58.896624] ? refcount_add+0x60/0x60 [ 58.900402] ? packet_rcv_fanout+0x7d0/0x7d0 [ 58.904798] __netif_receive_skb_core+0xc12/0x33d0 [ 58.909704] ? __bpf_address_lookup+0x2b0/0x2b0 [ 58.914364] ? nf_ingress+0x9f0/0x9f0 [ 58.918148] ? unwind_dump+0x4c0/0x4c0 [ 58.922040] ? check_noncircular+0x20/0x20 [ 58.926248] ? __kernel_text_address+0xae/0xe0 [ 58.930803] ? unwind_get_return_address+0x61/0xa0 [ 58.935705] ? __save_stack_trace+0x7e/0xd0 [ 58.940015] ? depot_save_stack+0x12c/0x490 [ 58.944328] ? find_held_lock+0x39/0x1d0 [ 58.948375] ? lock_downgrade+0x990/0x990 [ 58.952505] ? do_group_exit+0x149/0x400 [ 58.956551] ? lock_acquire+0x1d5/0x580 [ 58.960510] ? netif_receive_skb_internal+0x1d7/0x670 [ 58.965687] ? find_held_lock+0x39/0x1d0 [ 58.969731] ? pvclock_read_flags+0x160/0x160 [ 58.974201] ? lock_downgrade+0x990/0x990 [ 58.978335] ? lock_acquire+0x1d5/0x580 [ 58.982281] ? netif_receive_skb_internal+0xa2/0x670 [ 58.987358] ? ktime_get_with_offset+0x2c1/0x420 [ 58.992091] ? lock_release+0xd70/0xd70 [ 58.996038] ? ktime_get+0x3a0/0x3a0 [ 58.999741] __netif_receive_skb+0x2c/0x1b0 [ 59.004042] ? __netif_receive_skb+0x2c/0x1b0 [ 59.008518] netif_receive_skb_internal+0x10b/0x670 [ 59.013512] ? dev_cpu_dead+0xb00/0xb00 [ 59.017467] ? __alloc_pages_nodemask+0xd80/0xd80 [ 59.022293] ? net_rx_action+0x1910/0x1910 [ 59.026512] ? rcu_pm_notify+0xc0/0xc0 [ 59.030387] ? skb_gro_reset_offset+0x17b/0x300 [ 59.035039] napi_gro_receive+0x3d0/0x500 [ 59.039164] ? dev_gro_receive+0x19b0/0x19b0 [ 59.043547] ? eth_type_trans+0x2a3/0x650 [ 59.047671] ? eth_gro_receive+0x810/0x810 [ 59.051890] receive_buf+0xcc5/0x51f0 [ 59.055685] ? virtnet_set_rx_mode+0x9f0/0x9f0 [ 59.060244] ? print_usage_bug+0x480/0x480 [ 59.064461] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 59.069636] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 59.075491] ? complete+0x5f/0x80 [ 59.078915] ? complete+0x5f/0x80 [ 59.082340] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 59.087508] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 59.092510] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 59.097507] ? unwind_dump+0x4c0/0x4c0 [ 59.101373] ? unwind_dump+0x4c0/0x4c0 [ 59.105243] ? __unwind_start+0x169/0x330 [ 59.109381] ? unwind_get_return_address+0x61/0xa0 [ 59.114290] ? __save_stack_trace+0x61/0xd0 [ 59.118593] ? complete+0x5f/0x80 [ 59.122034] ? save_stack_trace+0x16/0x20 [ 59.126166] ? __lock_acquire+0x20fd/0x4620 [ 59.130480] ? find_held_lock+0x39/0x1d0 [ 59.134534] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 59.139700] ? lock_downgrade+0x990/0x990 [ 59.143820] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 59.148823] ? pvclock_read_flags+0x160/0x160 [ 59.153293] ? lock_release+0xd70/0xd70 [ 59.157252] ? _find_next_bit+0xee/0x120 [ 59.161294] ? _find_next_bit+0xee/0x120 [ 59.165342] ? find_next_bit+0x27/0x30 [ 59.169210] ? select_task_rq_fair+0xe9e/0x3060 [ 59.173862] ? irq_exit+0x1d3/0x210 [ 59.177497] ? check_noncircular+0x20/0x20 [ 59.181708] ? check_noncircular+0x20/0x20 [ 59.185920] ? check_noncircular+0x20/0x20 [ 59.190140] ? check_noncircular+0x20/0x20 [ 59.194351] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 59.199528] ? find_held_lock+0x39/0x1d0 [ 59.203578] ? lock_downgrade+0x990/0x990 [ 59.207709] ? lock_downgrade+0x990/0x990 [ 59.211834] ? check_noncircular+0x20/0x20 [ 59.216052] ? vring_use_dma_api+0x7f/0xa0 [ 59.220269] ? vring_unmap_one+0x49/0x3d0 [ 59.224393] ? detach_buf+0x463/0x6a0 [ 59.228164] ? do_raw_spin_trylock+0x190/0x190 [ 59.232731] ? virtqueue_get_buf_ctx+0x3b1/0x8b0 [ 59.237460] ? common_interrupt+0x9d/0x9d [ 59.241584] ? detach_buf+0x6a0/0x6a0 [ 59.245363] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 59.250359] virtnet_poll+0x304/0xad0 [ 59.254152] ? receive_buf+0x51f0/0x51f0 [ 59.258185] ? unwind_dump+0x4c0/0x4c0 [ 59.262061] ? net_rx_action+0x49b/0x1910 [ 59.266202] net_rx_action+0x792/0x1910 [ 59.270175] ? napi_complete_done+0x6c0/0x6c0 [ 59.274643] ? save_stack_trace+0x16/0x20 [ 59.278773] ? __lock_acquire+0x20fd/0x4620 [ 59.283081] ? rcu_pm_notify+0xc0/0xc0 [ 59.286968] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 59.292137] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 59.297323] ? note_gp_changes+0x650/0x650 [ 59.301534] ? rcu_pm_notify+0xc0/0xc0 [ 59.305422] ? rcu_read_lock_sched_held+0x108/0x120 [ 59.310416] ? __raise_softirq_irqoff+0x21c/0x2c0 [ 59.315238] ? raise_softirq+0x490/0x490 [ 59.319276] ? lock_downgrade+0x990/0x990 [ 59.323411] ? lock_acquire+0x1d5/0x580 [ 59.327359] ? clockevents_program_event+0x163/0x2e0 [ 59.332438] ? trace_hardirqs_off+0xd/0x10 [ 59.336651] ? __napi_schedule+0x25e/0x370 [ 59.340862] ? netdev_info+0x170/0x170 [ 59.344720] ? check_noncircular+0x20/0x20 [ 59.348932] ? rcu_pm_notify+0xc0/0xc0 [ 59.352800] ? check_noncircular+0x20/0x20 [ 59.357010] ? rcu_pm_notify+0xc0/0xc0 [ 59.360905] ? rcu_read_lock_sched_held+0x108/0x120 [ 59.365901] ? __handle_irq_event_percpu+0x308/0x9d0 [ 59.370984] ? rcu_pm_notify+0xc0/0xc0 [ 59.374859] __do_softirq+0x2bb/0xbd0 [ 59.378646] ? __softirqentry_text_start+0x8/0x8 [ 59.383374] ? do_raw_spin_trylock+0x190/0x190 [ 59.387927] ? handle_irq_event_percpu+0x141/0x1b0 [ 59.392841] ? __handle_irq_event_percpu+0x9d0/0x9d0 [ 59.397933] ? _raw_spin_lock+0x32/0x40 [ 59.401882] ? _raw_spin_unlock+0x22/0x30 [ 59.406003] ? handle_edge_irq+0x2b4/0x7c0 [ 59.410228] irq_exit+0x1d3/0x210 [ 59.413661] do_IRQ+0xf6/0x190 [ 59.416839] common_interrupt+0x9d/0x9d [ 59.420787] [ 59.423004] RIP: 0010:_raw_spin_unlock_irq+0x56/0x70 [ 59.428084] RSP: 0018:ffff8801d4357950 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff1e [ 59.435776] RAX: dffffc0000000000 RBX: ffff8801d8c54c50 RCX: 0000000000000000 [ 59.443031] RDX: 1ffffffff0b592ff RSI: 0000000000000001 RDI: ffffffff85ac97f8 [ 59.450272] RBP: ffff8801d4357958 R08: ffff8801d43572b8 R09: 0000000000000000 [ 59.457516] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 59.464759] R13: ffffed003a86af35 R14: 0000000000000000 R15: ffffffff86488ba0 [ 59.472037] task_work_run+0x16c/0x270 [ 59.475923] ? task_work_cancel+0x210/0x210 [ 59.480227] ? _raw_spin_unlock+0x22/0x30 [ 59.484348] ? switch_task_namespaces+0x87/0xc0 [ 59.489008] do_exit+0xa52/0x1b40 [ 59.492443] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 59.497433] ? trace_hardirqs_on+0xd/0x10 [ 59.501563] ? hrtimer_try_to_cancel+0x51/0x5c0 [ 59.506208] ? mm_update_next_owner+0x930/0x930 [ 59.510848] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 59.515758] ? check_same_owner+0x320/0x320 [ 59.520054] ? _do_fork+0x2f5/0xfe0 [ 59.523676] ? __might_sleep+0x95/0x190 [ 59.527636] ? do_nanosleep+0x508/0x6f0 [ 59.531589] ? schedule_timeout_idle+0x90/0x90 [ 59.536158] ? memset+0x31/0x40 [ 59.539421] ? hrtimer_nanosleep+0x2cc/0x860 [ 59.543812] ? nanosleep_copyout+0x100/0x100 [ 59.548206] ? __might_sleep+0x95/0x190 [ 59.552187] ? kasan_check_write+0x14/0x20 [ 59.556397] ? _copy_from_user+0x99/0x110 [ 59.560525] ? __hrtimer_init+0x140/0x140 [ 59.564648] ? syscall_return_slowpath+0x500/0x500 [ 59.569559] do_group_exit+0x149/0x400 [ 59.573429] ? SyS_exit+0x30/0x30 [ 59.576859] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 59.581848] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 59.586579] SyS_exit_group+0x1d/0x20 [ 59.590362] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 59.595088] RIP: 0033:0x44a769 [ 59.598250] RSP: 002b:00007ffea08ab338 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 59.605941] RAX: ffffffffffffffda RBX: 000000000000000b RCX: 000000000044a769 [ 59.613184] RDX: 0000000000448f81 RSI: 0000000000000000 RDI: 0000000000000000 [ 59.620431] RBP: 0000000000000082 R08: 00000000006dcbc0 R09: 0000000000000000 [ 59.627682] R10: 00000000006dcb44 R11: 0000000000000202 R12: 0000000000000000 [ 59.634926] R13: 00007ffea08ab2df R14: 00007fa7ee2999c0 R15: 0000000000000000 [ 59.642208] [ 59.643819] Allocated by task 10083: [ 59.647518] save_stack_trace+0x16/0x20 [ 59.651465] save_stack+0x43/0xd0 [ 59.654889] kasan_kmalloc+0xad/0xe0 [ 59.658573] __kmalloc+0x162/0x760 [ 59.662095] sk_prot_alloc+0x101/0x2a0 [ 59.665956] sk_alloc+0x89/0x700 [ 59.669294] packet_create+0x169/0xb00 [ 59.673153] __sock_create+0x4d4/0x850 [ 59.677017] SyS_socket+0xeb/0x200 [ 59.680544] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 59.685275] [ 59.686876] Freed by task 10023: [ 59.690213] save_stack_trace+0x16/0x20 [ 59.694157] save_stack+0x43/0xd0 [ 59.697581] kasan_slab_free+0x71/0xc0 [ 59.701438] kfree+0xca/0x250 [ 59.704525] __sk_destruct+0x74a/0x910 [ 59.708398] sk_destruct+0x47/0x80 [ 59.711919] __sk_free+0x57/0x230 [ 59.715345] sk_free+0x2a/0x40 [ 59.718511] packet_release+0x859/0xd70 [ 59.722458] sock_release+0x8d/0x1e0 [ 59.726142] sock_close+0x16/0x20 [ 59.729567] __fput+0x333/0x7f0 [ 59.732817] ____fput+0x15/0x20 [ 59.736069] task_work_run+0x199/0x270 [ 59.739929] do_exit+0xa52/0x1b40 [ 59.743355] do_group_exit+0x149/0x400 [ 59.747212] SyS_exit_group+0x1d/0x20 [ 59.750993] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 59.755726] [ 59.757329] The buggy address belongs to the object at ffff8801d35574c0 [ 59.757329] which belongs to the cache kmalloc-2048 of size 2048 [ 59.770130] The buggy address is located 1904 bytes inside of [ 59.770130] 2048-byte region [ffff8801d35574c0, ffff8801d3557cc0) [ 59.782148] The buggy address belongs to the page: [ 59.787053] page:ffffea00074d5580 count:1 mapcount:0 mapping:ffff8801d35563c0 index:0x0 compound_mapcount: 0 [ 59.797012] flags: 0x200000000008100(slab|head)