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-mmots-kasan-gce-8,10.128.0.30' (ECDSA) to the list of known hosts. 2017/09/20 18:27:54 parsed 1 programs 2017/09/20 18:27:54 executed programs: 0 2017/09/20 18:27:59 executed programs: 90 syzkaller login: [ 30.450999] dev_remove_pack: ffff8801cbfaac80 not found [ 30.467370] ================================================================== [ 30.474751] BUG: KASAN: use-after-free in __dev_remove_pack+0x305/0x3b0 [ 30.481473] Read of size 8 at addr ffff8801cb81cca8 by task syz-executor0/3344 [ 30.488799] [ 30.490413] CPU: 1 PID: 3344 Comm: syz-executor0 Not tainted 4.13.0-mm1+ #7 [ 30.497480] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.506812] Call Trace: [ 30.509377] dump_stack+0x194/0x257 [ 30.512977] ? arch_local_irq_restore+0x53/0x53 [ 30.517618] ? show_regs_print_info+0x65/0x65 [ 30.522092] ? __dev_remove_pack+0x305/0x3b0 [ 30.526475] print_address_description+0x73/0x250 [ 30.531291] ? __dev_remove_pack+0x305/0x3b0 [ 30.535672] kasan_report+0x24e/0x340 [ 30.539450] __asan_report_load8_noabort+0x14/0x20 [ 30.544365] __dev_remove_pack+0x305/0x3b0 [ 30.548580] ? dev_get_by_name_rcu+0x270/0x270 [ 30.553134] ? refcount_sub_and_test+0x115/0x1b0 [ 30.557872] __unregister_prot_hook+0x211/0x280 [ 30.562517] packet_release+0x8bb/0xd70 [ 30.566469] ? packet_set_ring+0x1b70/0x1b70 [ 30.570849] ? dentry_free+0xcd/0x130 [ 30.574621] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.579612] ? kmem_cache_free+0x249/0x280 [ 30.583829] ? dentry_free+0xd2/0x130 [ 30.587607] ? locks_remove_file+0x3fa/0x5a0 [ 30.591987] ? fcntl_setlk+0x10d0/0x10d0 [ 30.596021] ? __fsnotify_parent+0xb4/0x3a0 [ 30.600314] ? fsnotify+0x1af0/0x1af0 [ 30.604091] sock_release+0x8d/0x1e0 [ 30.607773] ? sock_release+0x8d/0x1e0 [ 30.611633] ? sock_release+0x1e0/0x1e0 [ 30.615576] sock_close+0x16/0x20 [ 30.619001] __fput+0x333/0x7f0 [ 30.622257] ? fput+0x140/0x140 [ 30.625512] ? check_same_owner+0x320/0x320 [ 30.629803] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.634273] ____fput+0x15/0x20 [ 30.637524] task_work_run+0x199/0x270 [ 30.641389] ? task_work_cancel+0x210/0x210 [ 30.645682] ? _raw_spin_unlock+0x22/0x30 [ 30.649804] ? switch_task_namespaces+0x87/0xc0 [ 30.654449] do_exit+0xa52/0x1b40 [ 30.657874] ? plist_check_list+0xa0/0xa0 [ 30.662003] ? plist_del+0x47b/0x990 [ 30.665690] ? mm_update_next_owner+0x930/0x930 [ 30.670331] ? plist_add+0x760/0x760 [ 30.674029] ? check_same_owner+0x320/0x320 [ 30.678328] ? find_held_lock+0x39/0x1d0 [ 30.682372] ? check_noncircular+0x20/0x20 [ 30.686580] ? lock_downgrade+0x990/0x990 [ 30.690703] ? refill_pi_state_cache.part.6+0x2f0/0x2f0 [ 30.696057] ? find_held_lock+0x39/0x1d0 [ 30.700100] ? lock_downgrade+0x990/0x990 [ 30.704219] ? recalc_sigpending_tsk+0x117/0x150 [ 30.708946] ? recalc_sigpending+0x103/0x160 [ 30.713325] ? recalc_sigpending_tsk+0x150/0x150 [ 30.718048] ? get_signal+0x397/0x17e0 [ 30.721917] do_group_exit+0x149/0x400 [ 30.725775] ? __lock_is_held+0xbc/0x140 [ 30.729806] ? SyS_exit+0x30/0x30 [ 30.733230] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.737697] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.742688] get_signal+0x7e8/0x17e0 [ 30.746406] ? ptrace_notify+0x130/0x130 [ 30.750439] ? __fget+0xbb/0x580 [ 30.753775] ? lock_downgrade+0x990/0x990 [ 30.757895] ? lock_release+0xd70/0xd70 [ 30.761848] ? exit_robust_list+0x240/0x240 [ 30.766152] do_signal+0x94/0x1ee0 [ 30.769667] ? iterate_fd+0x3f0/0x3f0 [ 30.773443] ? setup_sigcontext+0x7d0/0x7d0 [ 30.777744] ? do_page_fault+0xee/0x720 [ 30.781690] ? __do_page_fault+0xb60/0xb60 [ 30.785897] ? __fget_light+0x29d/0x390 [ 30.789847] ? selinux_tun_dev_create+0xc0/0xc0 [ 30.794492] ? selinux_netlbl_socket_setsockopt+0x10c/0x460 [ 30.800173] ? selinux_netlbl_sock_rcv_skb+0x730/0x730 [ 30.805423] ? exit_to_usermode_loop+0x98/0x300 [ 30.810068] exit_to_usermode_loop+0x224/0x300 [ 30.814623] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 30.820141] syscall_return_slowpath+0x42f/0x500 [ 30.824870] ? prepare_exit_to_usermode+0x2c0/0x2c0 [ 30.829857] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 30.834758] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.839756] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.844489] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 30.849212] RIP: 0033:0x4520a9 [ 30.852376] RSP: 002b:00007fe5f1d64cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 30.860055] RAX: fffffffffffffe00 RBX: 0000000000718028 RCX: 00000000004520a9 [ 30.867296] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000718028 [ 30.874545] RBP: 0000000000718000 R08: 0000000000000000 R09: 0000000000000000 [ 30.881784] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 30.889024] R13: 00007fffbe7ed02f R14: 00007fe5f1d659c0 R15: 0000000000000000 [ 30.896283] [ 30.897881] Allocated by task 3344: [ 30.901479] save_stack_trace+0x16/0x20 [ 30.905423] save_stack+0x43/0xd0 [ 30.908844] kasan_kmalloc+0xad/0xe0 [ 30.912526] kmem_cache_alloc_trace+0x136/0x750 [ 30.917166] fanout_add+0xa50/0x1190 [ 30.920849] packet_setsockopt+0xfdc/0x1e80 [ 30.925138] SyS_setsockopt+0x189/0x360 [ 30.929080] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 30.933799] [ 30.935397] Freed by task 3344: [ 30.938644] save_stack_trace+0x16/0x20 [ 30.942587] save_stack+0x43/0xd0 [ 30.946007] kasan_slab_free+0x71/0xc0 [ 30.949864] kfree+0xca/0x250 [ 30.952938] packet_release+0xa8f/0xd70 [ 30.956880] sock_release+0x8d/0x1e0 [ 30.960562] sock_close+0x16/0x20 [ 30.963983] __fput+0x333/0x7f0 [ 30.967230] ____fput+0x15/0x20 [ 30.970482] task_work_run+0x199/0x270 [ 30.974336] do_exit+0xa52/0x1b40 [ 30.977757] do_group_exit+0x149/0x400 [ 30.981613] get_signal+0x7e8/0x17e0 [ 30.985293] do_signal+0x94/0x1ee0 [ 30.988801] exit_to_usermode_loop+0x224/0x300 [ 30.993354] syscall_return_slowpath+0x42f/0x500 [ 30.998078] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 31.002801] [ 31.004399] The buggy address belongs to the object at ffff8801cb81c400 [ 31.004399] which belongs to the cache kmalloc-4096 of size 4096 [ 31.017197] The buggy address is located 2216 bytes inside of [ 31.017197] 4096-byte region [ffff8801cb81c400, ffff8801cb81d400) [ 31.029210] The buggy address belongs to the page: [ 31.034109] page:ffffea00072e0700 count:1 mapcount:0 mapping:ffff8801cb81c400 index:0x0 compound_mapcount: 0 [ 31.044052] flags: 0x200000000008100(slab|head) [ 31.048691] raw: 0200000000008100 ffff8801cb81c400 0000000000000000 0000000100000001 [ 31.056540] raw: ffffea00073659a0 ffffea00072e05a0 ffff8801dac00dc0 0000000000000000 [ 31.064387] page dumped because: kasan: bad access detected [ 31.070073] [ 31.071670] Memory state around the buggy address: [ 31.076568] ffff8801cb81cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.083893] ffff8801cb81cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.091219] >ffff8801cb81cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.098544] ^ [ 31.103179] ffff8801cb81cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.110513] ffff8801cb81cd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.117840] ================================================================== [ 31.125164] Disabling lock debugging due to kernel taint [ 31.130662] Kernel panic - not syncing: panic_on_warn set ... [ 31.130662] [ 31.137994] CPU: 1 PID: 3344 Comm: syz-executor0 Tainted: G B 4.13.0-mm1+ #7 [ 31.146273] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.155591] Call Trace: [ 31.158152] dump_stack+0x194/0x257 [ 31.161748] ? arch_local_irq_restore+0x53/0x53 [ 31.166383] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.171109] ? __dev_remove_pack+0x2f0/0x3b0 [ 31.175483] panic+0x1e4/0x417 [ 31.178641] ? __warn+0x1d9/0x1d9 [ 31.182065] ? __dev_remove_pack+0x305/0x3b0 [ 31.186437] kasan_end_report+0x50/0x50 [ 31.190374] kasan_report+0x137/0x340 [ 31.194141] __asan_report_load8_noabort+0x14/0x20 [ 31.199032] __dev_remove_pack+0x305/0x3b0 [ 31.203232] ? dev_get_by_name_rcu+0x270/0x270 [ 31.207779] ? refcount_sub_and_test+0x115/0x1b0 [ 31.212507] __unregister_prot_hook+0x211/0x280 [ 31.217142] packet_release+0x8bb/0xd70 [ 31.221084] ? packet_set_ring+0x1b70/0x1b70 [ 31.225463] ? dentry_free+0xcd/0x130 [ 31.229230] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.234222] ? kmem_cache_free+0x249/0x280 [ 31.238423] ? dentry_free+0xd2/0x130 [ 31.242192] ? locks_remove_file+0x3fa/0x5a0 [ 31.246567] ? fcntl_setlk+0x10d0/0x10d0 [ 31.250594] ? __fsnotify_parent+0xb4/0x3a0 [ 31.254880] ? fsnotify+0x1af0/0x1af0 [ 31.258648] sock_release+0x8d/0x1e0 [ 31.262326] ? sock_release+0x8d/0x1e0 [ 31.266179] ? sock_release+0x1e0/0x1e0 [ 31.270117] sock_close+0x16/0x20 [ 31.273536] __fput+0x333/0x7f0 [ 31.276783] ? fput+0x140/0x140 [ 31.280027] ? check_same_owner+0x320/0x320 [ 31.284316] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.288778] ____fput+0x15/0x20 [ 31.292025] task_work_run+0x199/0x270 [ 31.295879] ? task_work_cancel+0x210/0x210 [ 31.300166] ? _raw_spin_unlock+0x22/0x30 [ 31.304280] ? switch_task_namespaces+0x87/0xc0 [ 31.308916] do_exit+0xa52/0x1b40 [ 31.312334] ? plist_check_list+0xa0/0xa0 [ 31.316456] ? plist_del+0x47b/0x990 [ 31.320134] ? mm_update_next_owner+0x930/0x930 [ 31.324766] ? plist_add+0x760/0x760 [ 31.328450] ? check_same_owner+0x320/0x320 [ 31.332750] ? find_held_lock+0x39/0x1d0 [ 31.336779] ? check_noncircular+0x20/0x20 [ 31.340977] ? lock_downgrade+0x990/0x990 [ 31.345091] ? refill_pi_state_cache.part.6+0x2f0/0x2f0 [ 31.350428] ? find_held_lock+0x39/0x1d0 [ 31.354458] ? lock_downgrade+0x990/0x990 [ 31.358573] ? recalc_sigpending_tsk+0x117/0x150 [ 31.363292] ? recalc_sigpending+0x103/0x160 [ 31.367665] ? recalc_sigpending_tsk+0x150/0x150 [ 31.372384] ? get_signal+0x397/0x17e0 [ 31.376239] do_group_exit+0x149/0x400 [ 31.380091] ? __lock_is_held+0xbc/0x140 [ 31.384124] ? SyS_exit+0x30/0x30 [ 31.387541] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.392001] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.396983] get_signal+0x7e8/0x17e0 [ 31.400675] ? ptrace_notify+0x130/0x130 [ 31.404701] ? __fget+0xbb/0x580 [ 31.408030] ? lock_downgrade+0x990/0x990 [ 31.412143] ? lock_release+0xd70/0xd70 [ 31.416094] ? exit_robust_list+0x240/0x240 [ 31.420390] do_signal+0x94/0x1ee0 [ 31.423897] ? iterate_fd+0x3f0/0x3f0 [ 31.427668] ? setup_sigcontext+0x7d0/0x7d0 [ 31.431959] ? do_page_fault+0xee/0x720 [ 31.435898] ? __do_page_fault+0xb60/0xb60 [ 31.440098] ? __fget_light+0x29d/0x390 [ 31.444040] ? selinux_tun_dev_create+0xc0/0xc0 [ 31.448673] ? selinux_netlbl_socket_setsockopt+0x10c/0x460