net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.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 syzkaller login: [ 43.413649] dev_remove_pack: ffff88003aa74c00 not found [ 43.520541] ================================================================== [ 43.523005] BUG: KASAN: use-after-free in __dev_remove_pack+0x305/0x3b0 [ 43.525378] Read of size 8 at addr ffff88006c9ab768 by task syzkaller232410/3270 [ 43.527940] [ 43.528358] CPU: 2 PID: 3270 Comm: syzkaller232410 Not tainted 4.13.0-rc7-next-20170901+ #13 [ 43.530370] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 43.532509] Call Trace: [ 43.533346] dump_stack+0x194/0x257 [ 43.534616] ? arch_local_irq_restore+0x53/0x53 [ 43.536199] ? show_regs_print_info+0x65/0x65 [ 43.538589] ? __dev_remove_pack+0x305/0x3b0 [ 43.540099] print_address_description+0x73/0x250 [ 43.541739] ? __dev_remove_pack+0x305/0x3b0 [ 43.543130] kasan_report+0x24e/0x340 [ 43.544195] __asan_report_load8_noabort+0x14/0x20 [ 43.545403] __dev_remove_pack+0x305/0x3b0 [ 43.546426] ? dev_get_by_name_rcu+0x270/0x270 [ 43.547570] ? refcount_sub_and_test+0x115/0x1b0 [ 43.548400] __unregister_prot_hook+0x211/0x280 [ 43.549356] packet_release+0x8bb/0xd70 [ 43.549956] ? packet_set_ring+0x1b70/0x1b70 [ 43.550630] ? dentry_free+0xcd/0x130 [ 43.551333] ? rcu_read_lock_sched_held+0x108/0x120 [ 43.552109] ? kmem_cache_free+0x249/0x280 [ 43.552736] ? dentry_free+0xd2/0x130 [ 43.553297] ? locks_remove_file+0x3fa/0x5a0 [ 43.553938] ? fcntl_setlk+0x10d0/0x10d0 [ 43.554421] ? __fsnotify_parent+0xb4/0x3a0 [ 43.554939] ? fsnotify+0x1af0/0x1af0 [ 43.555395] sock_release+0x8d/0x1e0 [ 43.555829] ? sock_release+0x8d/0x1e0 [ 43.556292] ? sock_release+0x1e0/0x1e0 [ 43.556758] sock_close+0x16/0x20 [ 43.557168] __fput+0x333/0x7f0 [ 43.557567] ? fput+0x140/0x140 [ 43.557960] ? check_same_owner+0x320/0x320 [ 43.559023] ? _raw_spin_unlock_irq+0x27/0x70 [ 43.559509] ____fput+0x15/0x20 [ 43.559836] task_work_run+0x199/0x270 [ 43.560217] ? task_work_cancel+0x210/0x210 [ 43.560643] ? _raw_spin_unlock+0x22/0x30 [ 43.561049] ? switch_task_namespaces+0x87/0xc0 [ 43.561512] do_exit+0xa52/0x1b40 [ 43.561849] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.562331] ? trace_hardirqs_on+0xd/0x10 [ 43.562761] ? __hrtimer_get_remaining+0x181/0x1c0 [ 43.563249] ? mm_update_next_owner+0x930/0x930 [ 43.563711] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 43.564199] ? check_same_owner+0x320/0x320 [ 43.564628] ? _do_fork+0x2f5/0xfe0 [ 43.565003] ? rcu_note_context_switch+0x710/0x710 [ 43.565414] ? __might_sleep+0x95/0x190 [ 43.565738] ? do_nanosleep+0x508/0x6f0 [ 43.566088] ? schedule_timeout_idle+0x90/0x90 [ 43.566466] ? memset+0x31/0x40 [ 43.566757] ? hrtimer_nanosleep+0x2cc/0x860 [ 43.567145] ? nanosleep_copyout+0x100/0x100 [ 43.567521] ? __might_sleep+0x95/0x190 [ 43.567870] ? kasan_check_write+0x14/0x20 [ 43.568228] ? _copy_from_user+0x99/0x110 [ 43.568587] ? __hrtimer_init+0x140/0x140 [ 43.568946] ? syscall_return_slowpath+0x500/0x500 [ 43.569361] do_group_exit+0x149/0x400 [ 43.569695] ? SyS_exit+0x30/0x30 [ 43.569994] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.570421] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 43.570835] SyS_exit_group+0x1d/0x20 [ 43.571145] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.571501] RIP: 0033:0x440069 [ 43.571741] RSP: 002b:00007ffdb053c088 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 43.572318] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000440069 [ 43.572845] RDX: 000000000046a361 RSI: 0000000000000000 RDI: 0000000000000000 [ 43.573377] RBP: 0000000000000082 R08: 00000000006d2200 R09: 0000000000000000 [ 43.573914] R10: 00000000006d21bc R11: 0000000000000206 R12: 0000000000000000 [ 43.574452] R13: 0000000000000000 R14: 00007f133c1879c0 R15: 00007f133c187700 [ 43.575013] [ 43.575141] Allocated by task 3279: [ 43.575417] save_stack_trace+0x16/0x20 [ 43.575718] save_stack+0x43/0xd0 [ 43.575980] kasan_kmalloc+0xad/0xe0 [ 43.576262] kmem_cache_alloc_trace+0x136/0x750 [ 43.576614] fanout_add+0xa50/0x1190 [ 43.576895] packet_setsockopt+0xfdc/0x1e80 [ 43.577222] SyS_setsockopt+0x189/0x360 [ 43.577522] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.577892] [ 43.578021] Freed by task 3270: [ 43.578247] save_stack_trace+0x16/0x20 [ 43.578521] save_stack+0x43/0xd0 [ 43.578783] kasan_slab_free+0x71/0xc0 [ 43.579081] kfree+0xca/0x250 [ 43.579300] packet_release+0xa8f/0xd70 [ 43.580083] sock_release+0x8d/0x1e0 [ 43.580323] sock_close+0x16/0x20 [ 43.580570] __fput+0x333/0x7f0 [ 43.580799] ____fput+0x15/0x20 [ 43.581028] task_work_run+0x199/0x270 [ 43.581298] do_exit+0xa52/0x1b40 [ 43.581566] do_group_exit+0x149/0x400 [ 43.581836] SyS_exit_group+0x1d/0x20 [ 43.582102] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.582430] [ 43.582560] The buggy address belongs to the object at ffff88006c9aaec0 [ 43.582560] which belongs to the cache kmalloc-4096 of size 4096 [ 43.583430] The buggy address is located 2216 bytes inside of [ 43.583430] 4096-byte region [ffff88006c9aaec0, ffff88006c9abec0) [ 43.584247] The buggy address belongs to the page: [ 43.584586] page:ffffea0001b26a80 count:1 mapcount:0 mapping:ffff88006c9aaec0 index:0x0 compound_mapcount: 0 [ 43.585267] flags: 0x500000000008100(slab|head) [ 43.585592] raw: 0500000000008100 ffff88006c9aaec0 0000000000000000 0000000100000001 [ 43.586150] raw: ffffea0001a43020 ffffea0001a11020 ffff88003e800dc0 0000000000000000 [ 43.586704] page dumped because: kasan: bad access detected [ 43.587107] [ 43.587223] Memory state around the buggy address: [ 43.587563] ffff88006c9ab600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.588072] ffff88006c9ab680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.588568] >ffff88006c9ab700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.589074] ^ [ 43.589534] ffff88006c9ab780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.590040] ffff88006c9ab800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.590544] ================================================================== [ 43.591042] Disabling lock debugging due to kernel taint [ 43.591444] Kernel panic - not syncing: panic_on_warn set ... [ 43.591444] [ 43.591946] CPU: 2 PID: 3270 Comm: syzkaller232410 Tainted: G B 4.13.0-rc7-next-20170901+ #13 [ 43.592590] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 43.593132] Call Trace: [ 43.593308] dump_stack+0x194/0x257 [ 43.593558] ? arch_local_irq_restore+0x53/0x53 [ 43.593864] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 43.594193] ? __dev_remove_pack+0x2a0/0x3b0 [ 43.594559] panic+0x1e4/0x417 [ 43.594848] ? __warn+0x1d9/0x1d9 [ 43.595164] ? __dev_remove_pack+0x305/0x3b0 [ 43.595559] kasan_end_report+0x50/0x50 [ 43.595913] kasan_report+0x137/0x340 [ 43.596269] __asan_report_load8_noabort+0x14/0x20 [ 43.596602] __dev_remove_pack+0x305/0x3b0 [ 43.596889] ? dev_get_by_name_rcu+0x270/0x270 [ 43.597201] ? refcount_sub_and_test+0x115/0x1b0 [ 43.597525] __unregister_prot_hook+0x211/0x280 [ 43.597836] packet_release+0x8bb/0xd70 [ 43.598169] ? packet_set_ring+0x1b70/0x1b70 [ 43.598568] ? dentry_free+0xcd/0x130 [ 43.598933] ? rcu_read_lock_sched_held+0x108/0x120 [ 43.599408] ? kmem_cache_free+0x249/0x280 [ 43.599788] ? dentry_free+0xd2/0x130 [ 43.600089] ? locks_remove_file+0x3fa/0x5a0 [ 43.600448] ? fcntl_setlk+0x10d0/0x10d0 [ 43.600732] ? __fsnotify_parent+0xb4/0x3a0 [ 43.601029] ? fsnotify+0x1af0/0x1af0 [ 43.601671] sock_release+0x8d/0x1e0 [ 43.601969] ? sock_release+0x8d/0x1e0 [ 43.602267] ? sock_release+0x1e0/0x1e0 [ 43.602579] sock_close+0x16/0x20 [ 43.602890] __fput+0x333/0x7f0 [ 43.603145] ? fput+0x140/0x140 [ 43.603386] ? check_same_owner+0x320/0x320 [ 43.603696] ? _raw_spin_unlock_irq+0x27/0x70 [ 43.604041] ____fput+0x15/0x20 [ 43.604283] task_work_run+0x199/0x270 [ 43.604567] ? task_work_cancel+0x210/0x210 [ 43.604877] ? _raw_spin_unlock+0x22/0x30 [ 43.605162] ? switch_task_namespaces+0x87/0xc0 [ 43.605498] do_exit+0xa52/0x1b40 [ 43.605751] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.606093] ? trace_hardirqs_on+0xd/0x10 [ 43.606408] ? __hrtimer_get_remaining+0x181/0x1c0 [ 43.606749] ? mm_update_next_owner+0x930/0x930 [ 43.607068] ? __hrtimer_get_remaining+0x1c0/0x1c0 [ 43.607408] ? check_same_owner+0x320/0x320 [ 43.607761] ? _do_fork+0x2f5/0xfe0 [ 43.608026] ? rcu_note_context_switch+0x710/0x710 [ 43.608377] ? __might_sleep+0x95/0x190 [ 43.608653] ? do_nanosleep+0x508/0x6f0 [ 43.608935] ? schedule_timeout_idle+0x90/0x90 [ 43.609255] ? memset+0x31/0x40 [ 43.609489] ? hrtimer_nanosleep+0x2cc/0x860 [ 43.609795] ? nanosleep_copyout+0x100/0x100 [ 43.610097] ? __might_sleep+0x95/0x190 [ 43.610375] ? kasan_check_write+0x14/0x20 [ 43.610670] ? _copy_from_user+0x99/0x110 [ 43.610958] ? __hrtimer_init+0x140/0x140 [ 43.611245] ? syscall_return_slowpath+0x500/0x500 [ 43.611584] do_group_exit+0x149/0x400 [ 43.611848] ? SyS_exit+0x30/0x30 [ 43.612093] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.612434] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 43.612761] SyS_exit_group+0x1d/0x20 [ 43.613019] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.613346] RIP: 0033:0x440069 [ 43.613634] RSP: 002b:00007ffdb053c088 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 43.614156] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000440069 [ 43.614651] RDX: 000000000046a361 RSI: 0000000000000000 RDI: 0000000000000000 [ 43.615136] RBP: 0000000000000082 R08: 00000000006d2200 R09: 0000000000000000 [ 43.615627] R10: 00000000006d21bc R11: 0000000000000206 R12: 0000000000000000 [ 43.616124] R13: 0000000000000000 R14: 00007f133c1879c0 R15: 00007f133c187700 [ 43.616722] Dumping ftrace buffer: [ 43.616965] (ftrace buffer empty) [ 43.617233] Kernel Offset: disabled [ 43.617526] Rebooting in 86400 seconds..