Warning: Permanently added '10.128.0.171' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 38.499483] audit: type=1400 audit(1596692878.090:8): avc: denied { execmem } for pid=6349 comm="syz-executor228" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.580032] ================================================================== [ 38.587550] BUG: KASAN: use-after-free in ex_handler_refcount+0x164/0x1a0 [ 38.594469] Write of size 4 at addr ffff8880987c16d8 by task kworker/0:2/3345 [ 38.601728] [ 38.603356] CPU: 0 PID: 3345 Comm: kworker/0:2 Not tainted 4.14.192-syzkaller #0 [ 38.610875] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.620226] Workqueue: events do_enable_set [ 38.624537] Call Trace: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.627125] dump_stack+0x1b2/0x283 [ 38.630752] print_address_description.cold+0x54/0x1d3 [ 38.636027] kasan_report_error.cold+0x8a/0x194 [ 38.640688] ? ex_handler_refcount+0x164/0x1a0 [ 38.645265] __asan_report_store4_noabort+0x68/0x70 [ 38.650290] ? ex_handler_refcount+0x164/0x1a0 [ 38.654866] ex_handler_refcount+0x164/0x1a0 [ 38.659265] ? ex_handler_clear_fs+0xb0/0xb0 [ 38.663683] fixup_exception+0x8a/0xc3 [ 38.667568] do_trap+0x61/0x250 [ 38.670851] do_error_trap+0x132/0x2d0 [ 38.674734] ? math_error+0x2d0/0x2d0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.678529] ? inat_get_avx_attribute+0x52f2/0x6a9a [ 38.683557] ? __lock_acquire+0x5fc/0x3f20 [ 38.687804] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.692660] invalid_op+0x1b/0x40 [ 38.696141] RIP: 0010:inat_get_avx_attribute+0x52f2/0x6a9a [ 38.701767] RSP: 0018:ffff88809b6bfc88 EFLAGS: 00010297 [ 38.707124] RAX: ffff88809b6fe380 RBX: 0000000000000001 RCX: ffff8880987c16d8 [ 38.714388] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880987c16c0 [ 38.721650] RBP: ffff8880987c16c0 R08: ffffffff8a09dfd0 R09: 000000000004057c executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.728914] R10: ffff88809b6fec30 R11: ffff88809b6fe380 R12: ffff888096cdff90 [ 38.736174] R13: ffff88809b886200 R14: ffff8880aea2ad00 R15: ffff888096cdff80 [ 38.743484] ? l2cap_chan_put+0x10/0x1b0 [ 38.747556] do_enable_set+0x47f/0x8a0 [ 38.751439] ? lock_acquire+0x170/0x3f0 [ 38.755403] ? chan_recv_cb+0x970/0x970 [ 38.759392] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 38.764857] process_one_work+0x793/0x14a0 [ 38.769115] ? work_busy+0x320/0x320 [ 38.772906] ? worker_thread+0x158/0xff0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.776964] ? _raw_spin_unlock_irq+0x24/0x80 [ 38.781464] worker_thread+0x5cc/0xff0 [ 38.785354] ? rescuer_thread+0xc80/0xc80 [ 38.790883] kthread+0x30d/0x420 [ 38.794275] ? kthread_create_on_node+0xd0/0xd0 [ 38.798961] ret_from_fork+0x24/0x30 [ 38.802673] [ 38.804289] Allocated by task 2792: [ 38.807909] kasan_kmalloc+0xeb/0x160 [ 38.811702] kmem_cache_alloc_trace+0x131/0x3d0 [ 38.816368] l2cap_chan_create+0x3e/0x3c0 [ 38.820512] do_enable_set+0x4ac/0x8a0 [ 38.824418] process_one_work+0x793/0x14a0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.828648] worker_thread+0x5cc/0xff0 [ 38.832533] kthread+0x30d/0x420 [ 38.835891] ret_from_fork+0x24/0x30 [ 38.839586] [ 38.841200] Freed by task 2792: [ 38.844469] kasan_slab_free+0xc3/0x1a0 [ 38.848449] kfree+0xc9/0x250 [ 38.851544] l2cap_chan_put+0x152/0x1b0 [ 38.855519] do_enable_set+0x47f/0x8a0 [ 38.859403] process_one_work+0x793/0x14a0 [ 38.863630] worker_thread+0x5cc/0xff0 [ 38.867508] kthread+0x30d/0x420 [ 38.870864] ret_from_fork+0x24/0x30 [ 38.874559] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.876173] The buggy address belongs to the object at ffff8880987c16c0 [ 38.876173] which belongs to the cache kmalloc-2048 of size 2048 [ 38.889011] The buggy address is located 24 bytes inside of [ 38.889011] 2048-byte region [ffff8880987c16c0, ffff8880987c1ec0) [ 38.900875] The buggy address belongs to the page: [ 38.905797] page:ffffea000261f000 count:1 mapcount:0 mapping:ffff8880987c05c0 index:0x0 compound_mapcount: 0 [ 38.915776] flags: 0xfffe0000008100(slab|head) [ 38.920371] raw: 00fffe0000008100 ffff8880987c05c0 0000000000000000 0000000100000003 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.928280] raw: ffffea0002605e20 ffffea00025e3da0 ffff88812fe52c40 0000000000000000 [ 38.936158] page dumped because: kasan: bad access detected [ 38.941852] [ 38.943468] Memory state around the buggy address: [ 38.948394] ffff8880987c1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.955746] ffff8880987c1600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 38.963118] >ffff8880987c1680: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 38.970465] ^ executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.976688] ffff8880987c1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.984124] ffff8880987c1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.991468] ================================================================== [ 38.998812] Disabling lock debugging due to kernel taint executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 39.086063] Kernel panic - not syncing: panic_on_warn set ... [ 39.086063] [ 39.093447] CPU: 0 PID: 3345 Comm: kworker/0:2 Tainted: G B 4.14.192-syzkaller #0 [ 39.102178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.111561] Workqueue: events do_enable_set [ 39.115874] Call Trace: [ 39.118453] dump_stack+0x1b2/0x283 [ 39.122075] panic+0x1f9/0x42d [ 39.125261] ? add_taint.cold+0x16/0x16 [ 39.129228] ? ___preempt_schedule+0x16/0x18 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 39.133636] kasan_end_report+0x43/0x49 [ 39.137600] kasan_report_error.cold+0xa7/0x194 [ 39.142263] ? ex_handler_refcount+0x164/0x1a0 [ 39.146835] __asan_report_store4_noabort+0x68/0x70 [ 39.151857] ? ex_handler_refcount+0x164/0x1a0 [ 39.156454] ex_handler_refcount+0x164/0x1a0 [ 39.160853] ? ex_handler_clear_fs+0xb0/0xb0 [ 39.165251] fixup_exception+0x8a/0xc3 [ 39.169128] do_trap+0x61/0x250 [ 39.172412] do_error_trap+0x132/0x2d0 [ 39.176290] ? math_error+0x2d0/0x2d0 [ 39.180100] ? inat_get_avx_attribute+0x52f2/0x6a9a executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 39.185118] ? __lock_acquire+0x5fc/0x3f20 [ 39.189356] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.194200] invalid_op+0x1b/0x40 [ 39.197644] RIP: 0010:inat_get_avx_attribute+0x52f2/0x6a9a [ 39.203255] RSP: 0018:ffff88809b6bfc88 EFLAGS: 00010297 [ 39.208611] RAX: ffff88809b6fe380 RBX: 0000000000000001 RCX: ffff8880987c16d8 [ 39.215873] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880987c16c0 [ 39.223145] RBP: ffff8880987c16c0 R08: ffffffff8a09dfd0 R09: 000000000004057c executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 39.230404] R10: ffff88809b6fec30 R11: ffff88809b6fe380 R12: ffff888096cdff90 [ 39.237662] R13: ffff88809b886200 R14: ffff8880aea2ad00 R15: ffff888096cdff80 [ 39.244965] ? l2cap_chan_put+0x10/0x1b0 [ 39.249022] do_enable_set+0x47f/0x8a0 [ 39.252916] ? lock_acquire+0x170/0x3f0 [ 39.256889] ? chan_recv_cb+0x970/0x970 [ 39.260856] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 39.266298] process_one_work+0x793/0x14a0 [ 39.270567] ? work_busy+0x320/0x320 [ 39.274270] ? worker_thread+0x158/0xff0 [ 39.278326] ? _raw_spin_unlock_irq+0x24/0x80 [ 39.282813] worker_thread+0x5cc/0xff0 executing program executing program executing program executing program executing program executing program [ 39.286696] ? rescuer_thread+0xc80/0xc80 [ 39.290857] kthread+0x30d/0x420 [ 39.294213] ? kthread_create_on_node+0xd0/0xd0 [ 39.298875] ret_from_fork+0x24/0x30 [ 39.303539] Kernel Offset: disabled [ 39.307183] Rebooting in 86400 seconds..