[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.203' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 956.487695][ T186] ================================================================== [ 956.496362][ T186] BUG: KASAN: use-after-free in idr_for_each+0x206/0x220 [ 956.503412][ T186] Read of size 8 at addr ffff888032eb2c40 by task kworker/u4:4/186 [ 956.511443][ T186] [ 956.513842][ T186] CPU: 1 PID: 186 Comm: kworker/u4:4 Not tainted 5.10.0-rc5-syzkaller #0 [ 956.522353][ T186] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 956.535552][ T186] Workqueue: events_unbound io_ring_exit_work [ 956.541721][ T186] Call Trace: [ 956.545012][ T186] dump_stack+0x107/0x163 [ 956.549368][ T186] ? idr_for_each+0x206/0x220 [ 956.554049][ T186] ? idr_for_each+0x206/0x220 [ 956.558755][ T186] print_address_description.constprop.0.cold+0xae/0x4c8 [ 956.565805][ T186] ? _raw_spin_lock_irqsave+0x4e/0x50 [ 956.571488][ T186] ? vprintk_func+0x95/0x1e0 [ 956.576100][ T186] ? idr_for_each+0x206/0x220 [ 956.581826][ T186] ? idr_for_each+0x206/0x220 [ 956.586589][ T186] kasan_report.cold+0x1f/0x37 [ 956.591359][ T186] ? idr_for_each+0x206/0x220 [ 956.596031][ T186] ? io_uring_flush+0x290/0x290 [ 956.600893][ T186] idr_for_each+0x206/0x220 [ 956.605397][ T186] ? idr_find+0x50/0x50 [ 956.609561][ T186] ? rcu_read_lock_sched_held+0x3a/0x70 [ 956.615107][ T186] ? io_sqe_files_unregister+0x299/0x340 [ 956.620745][ T186] ? kmem_cache_free+0x315/0x350 [ 956.625774][ T186] io_ring_exit_work+0x3f7/0x7a0 [ 956.630719][ T186] process_one_work+0x933/0x15a0 [ 956.635753][ T186] ? lock_release+0x710/0x710 [ 956.640963][ T186] ? pwq_dec_nr_in_flight+0x320/0x320 [ 956.646344][ T186] ? rwlock_bug.part.0+0x90/0x90 [ 956.651282][ T186] ? _raw_spin_lock_irq+0x41/0x50 [ 956.656345][ T186] worker_thread+0x64c/0x1120 [ 956.661030][ T186] ? process_one_work+0x15a0/0x15a0 [ 956.666220][ T186] kthread+0x3b1/0x4a0 [ 956.670281][ T186] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 956.676249][ T186] ret_from_fork+0x1f/0x30 [ 956.680685][ T186] [ 956.683006][ T186] Allocated by task 10961: [ 956.687415][ T186] kasan_save_stack+0x1b/0x40 [ 956.692085][ T186] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 956.697704][ T186] kmem_cache_alloc+0x122/0x460 [ 956.702539][ T186] radix_tree_node_alloc.constprop.0+0x7c/0x350 [ 956.708788][ T186] idr_get_free+0x4c5/0x940 [ 956.713279][ T186] idr_alloc_u32+0x170/0x2d0 [ 956.717858][ T186] idr_alloc+0xc2/0x130 [ 956.722004][ T186] io_issue_sqe+0x2fc4/0x3d10 [ 956.726670][ T186] __io_queue_sqe+0x132/0xda0 [ 956.731348][ T186] io_queue_sqe+0x623/0x11f0 [ 956.736019][ T186] io_submit_sqes+0x15e1/0x28a0 [ 956.740862][ T186] __do_sys_io_uring_enter+0xc90/0x1ab0 [ 956.746402][ T186] do_syscall_64+0x2d/0x70 [ 956.752046][ T186] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 956.757926][ T186] [ 956.760328][ T186] Freed by task 8546: [ 956.764306][ T186] kasan_save_stack+0x1b/0x40 [ 956.768978][ T186] kasan_set_track+0x1c/0x30 [ 956.774177][ T186] kasan_set_free_info+0x1b/0x30 [ 956.779114][ T186] __kasan_slab_free+0x102/0x140 [ 956.784040][ T186] slab_free_freelist_hook+0x5d/0x150 [ 956.789410][ T186] kmem_cache_free+0x82/0x350 [ 956.794140][ T186] rcu_core+0x5df/0xe80 [ 956.798285][ T186] __do_softirq+0x2a0/0x9f6 [ 956.802884][ T186] [ 956.805193][ T186] Last call_rcu(): [ 956.809003][ T186] kasan_save_stack+0x1b/0x40 [ 956.813871][ T186] kasan_record_aux_stack+0xc0/0xf0 [ 956.819253][ T186] call_rcu+0xbb/0x700 [ 956.823485][ T186] delete_node+0x591/0x8c0 [ 956.827888][ T186] __radix_tree_delete+0x190/0x370 [ 956.833072][ T186] radix_tree_delete_item+0xe7/0x230 [ 956.838437][ T186] __io_destroy_buffers+0x161/0x200 [ 956.843629][ T186] idr_for_each+0x113/0x220 [ 956.848210][ T186] io_ring_exit_work+0x3f7/0x7a0 [ 956.853311][ T186] process_one_work+0x933/0x15a0 [ 956.858322][ T186] worker_thread+0x64c/0x1120 [ 956.863605][ T186] kthread+0x3b1/0x4a0 [ 956.867757][ T186] ret_from_fork+0x1f/0x30 [ 956.872160][ T186] [ 956.874481][ T186] The buggy address belongs to the object at ffff888032eb2c00 [ 956.874481][ T186] which belongs to the cache radix_tree_node of size 576 [ 956.891491][ T186] The buggy address is located 64 bytes inside of [ 956.891491][ T186] 576-byte region [ffff888032eb2c00, ffff888032eb2e40) [ 956.906265][ T186] The buggy address belongs to the page: [ 956.911910][ T186] page:00000000102f3139 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32eb0 [ 956.922059][ T186] head:00000000102f3139 order:2 compound_mapcount:0 compound_pincount:0 [ 956.930646][ T186] flags: 0xfff00000010200(slab|head) [ 956.935952][ T186] raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88801004db40 [ 956.945005][ T186] raw: 0000000000000000 0000000000170017 00000001ffffffff 0000000000000000 [ 956.953758][ T186] page dumped because: kasan: bad access detected [ 956.960158][ T186] [ 956.962471][ T186] Memory state around the buggy address: [ 956.968439][ T186] ffff888032eb2b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 956.977047][ T186] ffff888032eb2b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc executing program [ 956.985540][ T186] >ffff888032eb2c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 956.994703][ T186] ^ [ 957.000854][ T186] ffff888032eb2c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 957.008902][ T186] ffff888032eb2d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 957.016943][ T186] ================================================================== [ 957.024986][ T186] Disabling lock debugging due to kernel taint executing program executing program executing program executing program executing program [ 957.047762][ T186] Kernel panic - not syncing: panic_on_warn set ... [ 957.054397][ T186] CPU: 1 PID: 186 Comm: kworker/u4:4 Tainted: G B 5.10.0-rc5-syzkaller #0 [ 957.064275][ T186] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 957.074343][ T186] Workqueue: events_unbound io_ring_exit_work [ 957.080589][ T186] Call Trace: [ 957.083880][ T186] dump_stack+0x107/0x163 [ 957.088216][ T186] ? idr_for_each+0x110/0x220 [ 957.092939][ T186] panic+0x306/0x73d [ 957.096841][ T186] ? __warn_printk+0xf3/0xf3 [ 957.101428][ T186] ? preempt_schedule_common+0x59/0xc0 [ 957.106883][ T186] ? idr_for_each+0x206/0x220 [ 957.111588][ T186] ? preempt_schedule_thunk+0x16/0x18 [ 957.117549][ T186] ? trace_hardirqs_on+0x51/0x1c0 [ 957.122565][ T186] ? idr_for_each+0x206/0x220 [ 957.127243][ T186] ? idr_for_each+0x206/0x220 [ 957.132016][ T186] end_report+0x58/0x5e [ 957.136153][ T186] kasan_report.cold+0xd/0x37 [ 957.140904][ T186] ? idr_for_each+0x206/0x220 [ 957.145575][ T186] ? io_uring_flush+0x290/0x290 [ 957.150582][ T186] idr_for_each+0x206/0x220 [ 957.155068][ T186] ? idr_find+0x50/0x50 [ 957.159228][ T186] ? rcu_read_lock_sched_held+0x3a/0x70 [ 957.164779][ T186] ? io_sqe_files_unregister+0x299/0x340 [ 957.170412][ T186] ? kmem_cache_free+0x315/0x350 [ 957.175560][ T186] io_ring_exit_work+0x3f7/0x7a0 [ 957.180588][ T186] process_one_work+0x933/0x15a0 [ 957.185667][ T186] ? lock_release+0x710/0x710 [ 957.191034][ T186] ? pwq_dec_nr_in_flight+0x320/0x320 [ 957.196781][ T186] ? rwlock_bug.part.0+0x90/0x90 [ 957.201706][ T186] ? _raw_spin_lock_irq+0x41/0x50 [ 957.206997][ T186] worker_thread+0x64c/0x1120 [ 957.211672][ T186] ? process_one_work+0x15a0/0x15a0 [ 957.217118][ T186] kthread+0x3b1/0x4a0 [ 957.221258][ T186] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 957.227221][ T186] ret_from_fork+0x1f/0x30 [ 957.235979][ T186] Kernel Offset: disabled [ 957.240632][ T186] Rebooting in 86400 seconds..