Warning: Permanently added '10.128.10.40' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 178.509855][ T7932] ================================================================== [ 178.518332][ T7932] BUG: KASAN: use-after-free in io_wq_worker_running+0xde/0x110 [ 178.525981][ T7932] Write of size 4 at addr ffff88821aff808c by task io_wqe_worker-0/7932 [ 178.534311][ T7932] [ 178.536655][ T7932] CPU: 1 PID: 7932 Comm: io_wqe_worker-0 Not tainted 5.9.0-rc6-next-20200924-syzkaller #0 [ 178.546545][ T7932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 178.556606][ T7932] Call Trace: [ 178.559916][ T7932] dump_stack+0x198/0x1fb [ 178.564295][ T7932] ? io_wq_worker_running+0xde/0x110 [ 178.570370][ T7932] ? io_wq_worker_running+0xde/0x110 [ 178.575673][ T7932] print_address_description.constprop.0.cold+0xae/0x497 [ 178.582707][ T7932] ? check_preemption_disabled+0x50/0x130 [ 178.588439][ T7932] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 178.593829][ T7932] ? vprintk_func+0x95/0x1e0 [ 178.598436][ T7932] ? io_wq_worker_running+0xde/0x110 [ 178.603827][ T7932] ? io_wq_worker_running+0xde/0x110 [ 178.609121][ T7932] kasan_report.cold+0x1f/0x37 [ 178.613902][ T7932] ? lockdep_hardirqs_on+0x41/0x100 [ 178.619110][ T7932] ? io_wq_worker_running+0xde/0x110 [ 178.624406][ T7932] check_memory_region+0x13d/0x180 [ 178.629528][ T7932] io_wq_worker_running+0xde/0x110 [ 178.634652][ T7932] schedule_timeout+0x148/0x250 [ 178.639506][ T7932] ? usleep_range+0x170/0x170 [ 178.644189][ T7932] ? __next_timer_interrupt+0x210/0x210 [ 178.649755][ T7932] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 178.655572][ T7932] ? lockdep_hardirqs_on+0x53/0x100 [ 178.660780][ T7932] io_wqe_worker+0x514/0x10d0 [ 178.665478][ T7932] ? io_worker_handle_work+0x13f0/0x13f0 [ 178.671216][ T7932] ? lockdep_hardirqs_on+0x53/0x100 [ 178.676426][ T7932] ? __kthread_parkme+0x13f/0x1e0 [ 178.681459][ T7932] ? io_worker_handle_work+0x13f0/0x13f0 [ 178.687101][ T7932] kthread+0x3af/0x4a0 [ 178.691176][ T7932] ? __kthread_bind_mask+0xc0/0xc0 [ 178.697258][ T7932] ret_from_fork+0x1f/0x30 [ 178.701687][ T7932] [ 178.704017][ T7932] Allocated by task 7929: [ 178.708351][ T7932] kasan_save_stack+0x1b/0x40 [ 178.713035][ T7932] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 178.718679][ T7932] kmem_cache_alloc_node_trace+0x19f/0x5b0 [ 178.724496][ T7932] io_wq_create+0x57b/0xa10 [ 178.729022][ T7932] io_uring_setup+0x24df/0x3130 [ 178.733886][ T7932] do_syscall_64+0x2d/0x70 [ 178.738320][ T7932] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 178.744206][ T7932] [ 178.746535][ T7932] Freed by task 21: [ 178.750350][ T7932] kasan_save_stack+0x1b/0x40 [ 178.755039][ T7932] kasan_set_track+0x1c/0x30 [ 178.759637][ T7932] kasan_set_free_info+0x1b/0x30 [ 178.764584][ T7932] __kasan_slab_free+0xd8/0x120 [ 178.769442][ T7932] kfree+0x10e/0x2a0 [ 178.778223][ T7932] io_wq_destroy+0x2af/0x460 [ 178.782811][ T7932] io_ring_exit_work+0x132/0x5f0 [ 178.787734][ T7932] process_one_work+0x933/0x15a0 [ 178.792678][ T7932] worker_thread+0x64c/0x1120 [ 178.797338][ T7932] kthread+0x3af/0x4a0 [ 178.801399][ T7932] ret_from_fork+0x1f/0x30 [ 178.805792][ T7932] [ 178.808109][ T7932] The buggy address belongs to the object at ffff88821aff8000 [ 178.808109][ T7932] which belongs to the cache kmalloc-1k of size 1024 [ 178.822148][ T7932] The buggy address is located 140 bytes inside of [ 178.822148][ T7932] 1024-byte region [ffff88821aff8000, ffff88821aff8400) [ 178.835506][ T7932] The buggy address belongs to the page: [ 178.841143][ T7932] page:0000000094e463c3 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21aff8 [ 178.851793][ T7932] flags: 0x57ffe0000000200(slab) [ 178.856720][ T7932] raw: 057ffe0000000200 ffffea00085d55c8 ffffea0008527fc8 ffff8880aa040700 [ 178.865300][ T7932] raw: 0000000000000000 ffff88821aff8000 0000000100000002 0000000000000000 [ 178.873868][ T7932] page dumped because: kasan: bad access detected [ 178.880282][ T7932] [ 178.882615][ T7932] Memory state around the buggy address: [ 178.888232][ T7932] ffff88821aff7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 178.896285][ T7932] ffff88821aff8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program [ 178.904332][ T7932] >ffff88821aff8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 178.912399][ T7932] ^ [ 178.916713][ T7932] ffff88821aff8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 178.924773][ T7932] ffff88821aff8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 178.932833][ T7932] ================================================================== [ 178.944301][ T7932] 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 [ 180.816884][ T7932] Kernel panic - not syncing: panic_on_warn set ... [ 180.823713][ T7932] CPU: 0 PID: 7932 Comm: io_wqe_worker-0 Tainted: G B 5.9.0-rc6-next-20200924-syzkaller #0 [ 180.835015][ T7932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 180.845328][ T7932] Call Trace: [ 180.848641][ T7932] dump_stack+0x198/0x1fb [ 180.852997][ T7932] ? io_wq_manager+0x9a0/0x9a0 [ 180.857788][ T7932] panic+0x382/0x7fb [ 180.861702][ T7932] ? __warn_printk+0xf3/0xf3 [ 180.866397][ T7932] ? preempt_schedule_common+0x59/0xc0 [ 180.872009][ T7932] ? io_wq_worker_running+0xde/0x110 [ 180.877318][ T7932] ? preempt_schedule_thunk+0x16/0x18 [ 180.882796][ T7932] ? trace_hardirqs_on+0x51/0x1c0 [ 180.887927][ T7932] ? io_wq_worker_running+0xde/0x110 [ 180.893312][ T7932] ? io_wq_worker_running+0xde/0x110 [ 180.898623][ T7932] end_report+0x58/0x5e [ 180.902897][ T7932] kasan_report.cold+0xd/0x37 [ 180.907589][ T7932] ? lockdep_hardirqs_on+0x41/0x100 [ 180.912803][ T7932] ? io_wq_worker_running+0xde/0x110 [ 180.918124][ T7932] check_memory_region+0x13d/0x180 [ 180.923375][ T7932] io_wq_worker_running+0xde/0x110 [ 180.928511][ T7932] schedule_timeout+0x148/0x250 [ 180.933374][ T7932] ? usleep_range+0x170/0x170 [ 180.938194][ T7932] ? __next_timer_interrupt+0x210/0x210 [ 180.943754][ T7932] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 180.949570][ T7932] ? lockdep_hardirqs_on+0x53/0x100 [ 180.954786][ T7932] io_wqe_worker+0x514/0x10d0 [ 180.959482][ T7932] ? io_worker_handle_work+0x13f0/0x13f0 [ 180.965120][ T7932] ? lockdep_hardirqs_on+0x53/0x100 [ 180.970570][ T7932] ? __kthread_parkme+0x13f/0x1e0 [ 180.975607][ T7932] ? io_worker_handle_work+0x13f0/0x13f0 [ 180.981256][ T7932] kthread+0x3af/0x4a0 [ 180.985339][ T7932] ? __kthread_bind_mask+0xc0/0xc0 [ 180.990546][ T7932] ret_from_fork+0x1f/0x30 [ 180.996710][ T7932] Kernel Offset: disabled [ 181.001271][ T7932] Rebooting in 86400 seconds..