Warning: Permanently added '10.128.15.202' (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 executing program executing program executing program executing program executing program executing program syzkaller login: [ 42.324093] audit: type=1400 audit(1596871250.327:8): avc: denied { execmem } for pid=6349 comm="syz-executor744" 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 [ 42.397544] ================================================================== [ 42.405027] BUG: KASAN: use-after-free in ex_handler_refcount+0x164/0x1a0 [ 42.411946] Write of size 4 at addr ffff8880974dc418 by task kworker/0:2/4112 [ 42.419209] [ 42.420834] CPU: 0 PID: 4112 Comm: kworker/0:2 Not tainted 4.14.193-syzkaller #0 [ 42.428355] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.437708] Workqueue: events do_enable_set [ 42.442024] 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 [ 42.444608] dump_stack+0x1b2/0x283 [ 42.448243] print_address_description.cold+0x54/0x1d3 [ 42.453520] kasan_report_error.cold+0x8a/0x194 [ 42.458184] ? ex_handler_refcount+0x164/0x1a0 [ 42.462760] __asan_report_store4_noabort+0x68/0x70 [ 42.467786] ? ex_handler_refcount+0x164/0x1a0 [ 42.472372] ex_handler_refcount+0x164/0x1a0 [ 42.476775] ? ex_handler_clear_fs+0xb0/0xb0 [ 42.481185] fixup_exception+0x8a/0xc3 [ 42.485071] do_trap+0x61/0x250 [ 42.488350] do_error_trap+0x132/0x2d0 [ 42.492236] ? math_error+0x2d0/0x2d0 [ 42.496036] ? inat_get_avx_attribute+0x52f2/0x6a9a [ 42.501050] ? __lock_acquire+0x5fc/0x3f20 [ 42.505289] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.510133] invalid_op+0x1b/0x40 [ 42.513583] RIP: 0010:inat_get_avx_attribute+0x52f2/0x6a9a [ 42.519229] RSP: 0018:ffff8880882b7c88 EFLAGS: 00010297 [ 42.524589] RAX: ffff8880882a6300 RBX: 0000000000000001 RCX: ffff8880974dc418 [ 42.531851] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880974dc400 [ 42.539123] RBP: ffff8880974dc400 R08: ffffffff8a0b4450 R09: 0000000000040578 [ 42.546389] R10: ffff8880882a6bb0 R11: ffff8880882a6300 R12: ffff888097746290 [ 42.553652] R13: ffff8880a0794700 R14: ffff8880aea2ad00 R15: ffff888097746280 [ 42.560942] ? l2cap_chan_put+0x10/0x1b0 [ 42.565001] do_enable_set+0x47f/0x8a0 [ 42.568890] ? lock_acquire+0x170/0x3f0 [ 42.572860] ? chan_recv_cb+0x970/0x970 [ 42.576839] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 42.582290] process_one_work+0x793/0x14a0 [ 42.586525] ? work_busy+0x320/0x320 [ 42.590236] ? worker_thread+0x158/0xff0 [ 42.594296] ? _raw_spin_unlock_irq+0x24/0x80 [ 42.598791] worker_thread+0x5cc/0xff0 [ 42.602689] ? rescuer_thread+0xc80/0xc80 [ 42.606841] kthread+0x30d/0x420 [ 42.610206] ? kthread_create_on_node+0xd0/0xd0 [ 42.614877] ret_from_fork+0x24/0x30 [ 42.618592] [ 42.620213] Allocated by task 18: [ 42.623664] kasan_kmalloc+0xeb/0x160 [ 42.627462] kmem_cache_alloc_trace+0x131/0x3d0 [ 42.632217] l2cap_chan_create+0x3e/0x3c0 [ 42.636361] do_enable_set+0x4ac/0x8a0 [ 42.640245] process_one_work+0x793/0x14a0 [ 42.644473] worker_thread+0x5cc/0xff0 [ 42.648353] kthread+0x30d/0x420 [ 42.651804] ret_from_fork+0x24/0x30 [ 42.655514] [ 42.657135] Freed by task 18: [ 42.660245] kasan_slab_free+0xc3/0x1a0 [ 42.664220] kfree+0xc9/0x250 [ 42.667333] l2cap_chan_put+0x152/0x1b0 [ 42.671323] do_enable_set+0x47f/0x8a0 [ 42.675213] process_one_work+0x793/0x14a0 [ 42.679444] worker_thread+0x5cc/0xff0 [ 42.683327] kthread+0x30d/0x420 [ 42.686687] ret_from_fork+0x24/0x30 [ 42.690390] [ 42.692010] The buggy address belongs to the object at ffff8880974dc400 [ 42.692010] which belongs to the cache kmalloc-2048 of size 2048 [ 42.704838] The buggy address is located 24 bytes inside of [ 42.704838] 2048-byte region [ffff8880974dc400, ffff8880974dcc00) [ 42.716711] The buggy address belongs to the page: [ 42.721637] page:ffffea00025d3700 count:1 mapcount:0 mapping:ffff8880974dc400 index:0x0 compound_mapcount: 0 [ 42.731638] flags: 0xfffe0000008100(slab|head) [ 42.736221] raw: 00fffe0000008100 ffff8880974dc400 0000000000000000 0000000100000003 [ 42.744100] raw: ffffea00025c2020 ffffea00021de120 ffff88812fe52c40 0000000000000000 [ 42.751975] page dumped because: kasan: bad access detected [ 42.757676] [ 42.759296] Memory state around the buggy address: [ 42.764220] ffff8880974dc300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 42.771578] ffff8880974dc380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 42.778936] >ffff8880974dc400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.786293] ^ [ 42.790441] ffff8880974dc480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.797797] ffff8880974dc500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.805165] ================================================================== [ 42.812517] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.981145] Kernel panic - not syncing: panic_on_warn set ... [ 42.981145] [ 42.988541] CPU: 0 PID: 4112 Comm: kworker/0:2 Tainted: G B 4.14.193-syzkaller #0 [ 42.997279] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.006631] Workqueue: events do_enable_set [ 43.010949] Call Trace: [ 43.013531] dump_stack+0x1b2/0x283 [ 43.017154] panic+0x1f9/0x42d [ 43.020341] ? add_taint.cold+0x16/0x16 [ 43.024316] ? ___preempt_schedule+0x16/0x18 [ 43.028722] kasan_end_report+0x43/0x49 [ 43.032690] kasan_report_error.cold+0xa7/0x194 [ 43.037354] ? ex_handler_refcount+0x164/0x1a0 [ 43.041928] __asan_report_store4_noabort+0x68/0x70 [ 43.046937] ? ex_handler_refcount+0x164/0x1a0 [ 43.051508] ex_handler_refcount+0x164/0x1a0 [ 43.055910] ? ex_handler_clear_fs+0xb0/0xb0 [ 43.060309] fixup_exception+0x8a/0xc3 [ 43.064192] do_trap+0x61/0x250 [ 43.067465] do_error_trap+0x132/0x2d0 [ 43.071350] ? math_error+0x2d0/0x2d0 [ 43.075146] ? inat_get_avx_attribute+0x52f2/0x6a9a [ 43.080157] ? __lock_acquire+0x5fc/0x3f20 [ 43.084388] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.089225] invalid_op+0x1b/0x40 [ 43.092679] RIP: 0010:inat_get_avx_attribute+0x52f2/0x6a9a [ 43.098293] RSP: 0018:ffff8880882b7c88 EFLAGS: 00010297 [ 43.103681] RAX: ffff8880882a6300 RBX: 0000000000000001 RCX: ffff8880974dc418 [ 43.110941] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880974dc400 [ 43.118201] RBP: ffff8880974dc400 R08: ffffffff8a0b4450 R09: 0000000000040578 [ 43.125461] R10: ffff8880882a6bb0 R11: ffff8880882a6300 R12: ffff888097746290 [ 43.132717] R13: ffff8880a0794700 R14: ffff8880aea2ad00 R15: ffff888097746280 [ 43.139996] ? l2cap_chan_put+0x10/0x1b0 [ 43.144052] do_enable_set+0x47f/0x8a0 [ 43.147936] ? lock_acquire+0x170/0x3f0 [ 43.151902] ? chan_recv_cb+0x970/0x970 [ 43.155899] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 43.161347] process_one_work+0x793/0x14a0 [ 43.165579] ? work_busy+0x320/0x320 [ 43.169285] ? worker_thread+0x158/0xff0 [ 43.173343] ? _raw_spin_unlock_irq+0x24/0x80 [ 43.177830] worker_thread+0x5cc/0xff0 [ 43.181716] ? rescuer_thread+0xc80/0xc80 [ 43.185861] kthread+0x30d/0x420 [ 43.189220] ? kthread_create_on_node+0xd0/0xd0 [ 43.193886] ret_from_fork+0x24/0x30 [ 43.198629] Kernel Offset: disabled [ 43.202244] Rebooting in 86400 seconds..