Starting Load/Save RF Kill Switch Status... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.121' (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 syzkaller login: [ 71.281252][ T3244] ieee802154 phy0 wpan0: encryption failed: -22 [ 71.289815][ T3244] ieee802154 phy1 wpan1: encryption failed: -22 executing program [ 71.415527][ T8509] ================================================================== [ 71.429391][ T8509] BUG: KASAN: use-after-free in create_worker_cb+0xaa/0xc0 [ 71.439483][ T8509] Read of size 8 at addr ffff88801bf150e8 by task syz-executor364/8509 [ 71.450054][ T8509] [ 71.452703][ T8509] CPU: 0 PID: 8509 Comm: syz-executor364 Not tainted 5.12.0-rc4-next-20210326-syzkaller #0 [ 71.468060][ T8509] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.481187][ T8509] Call Trace: [ 71.485253][ T8509] dump_stack+0x141/0x1d7 [ 71.490726][ T8509] ? create_worker_cb+0xaa/0xc0 [ 71.498101][ T8509] print_address_description.constprop.0.cold+0x5b/0x2f8 [ 71.506340][ T8509] ? create_worker_cb+0xaa/0xc0 [ 71.511503][ T8509] ? create_worker_cb+0xaa/0xc0 [ 71.517028][ T8509] kasan_report.cold+0x7c/0xd8 [ 71.524614][ T8509] ? create_worker_cb+0xaa/0xc0 [ 71.530039][ T8509] create_worker_cb+0xaa/0xc0 [ 71.535039][ T8509] task_work_run+0xdd/0x1a0 [ 71.540708][ T8509] do_exit+0xbfc/0x2a60 [ 71.545607][ T8509] ? find_held_lock+0x2d/0x110 [ 71.550861][ T8509] ? mm_update_next_owner+0x7a0/0x7a0 [ 71.559771][ T8509] ? lock_downgrade+0x6e0/0x6e0 [ 71.565057][ T8509] ? kick_process+0xe0/0x180 [ 71.569866][ T8509] ? _raw_spin_unlock_irq+0x1f/0x40 [ 71.576160][ T8509] do_group_exit+0x125/0x310 [ 71.581355][ T8509] __x64_sys_exit_group+0x3a/0x50 [ 71.587087][ T8509] do_syscall_64+0x2d/0x70 [ 71.593823][ T8509] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 71.603386][ T8509] RIP: 0033:0x447359 [ 71.608242][ T8509] Code: Unable to access opcode bytes at RIP 0x44732f. [ 71.615847][ T8509] RSP: 002b:00007ffdfb4e3ea8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 71.628316][ T8509] RAX: ffffffffffffffda RBX: 00000000004b8390 RCX: 0000000000447359 [ 71.641801][ T8509] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 71.651399][ T8509] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 [ 71.660436][ T8509] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004b8390 [ 71.669456][ T8509] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 71.677881][ T8509] [ 71.680881][ T8509] Allocated by task 8509: [ 71.688028][ T8509] kasan_save_stack+0x1b/0x40 [ 71.692929][ T8509] __kasan_kmalloc+0x9b/0xd0 [ 71.697707][ T8509] io_wq_create+0x6e4/0xca0 [ 71.702218][ T8509] io_uring_alloc_task_context+0x1bf/0x660 [ 71.708195][ T8509] __io_uring_add_task_file+0x29a/0x3c0 [ 71.714231][ T8509] io_uring_setup+0x20dd/0x2b00 [ 71.719795][ T8509] do_syscall_64+0x2d/0x70 [ 71.724648][ T8509] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 71.730933][ T8509] [ 71.733574][ T8509] Freed by task 8509: [ 71.738123][ T8509] kasan_save_stack+0x1b/0x40 [ 71.744491][ T8509] kasan_set_track+0x1c/0x30 [ 71.749656][ T8509] kasan_set_free_info+0x20/0x30 [ 71.754998][ T8509] __kasan_slab_free+0xfb/0x130 [ 71.760992][ T8509] slab_free_freelist_hook+0xdf/0x240 [ 71.767983][ T8509] kfree+0xe5/0x7f0 [ 71.772388][ T8509] io_wq_destroy+0x13e/0x2d0 [ 71.778993][ T8509] io_wq_put_and_exit+0x7a/0xa0 [ 71.784837][ T8509] io_uring_clean_tctx+0xed/0x160 [ 71.790699][ T8509] __io_uring_files_cancel+0x703/0x850 [ 71.796413][ T8509] do_exit+0x299/0x2a60 [ 71.802254][ T8509] do_group_exit+0x125/0x310 [ 71.809031][ T8509] __x64_sys_exit_group+0x3a/0x50 [ 71.815054][ T8509] do_syscall_64+0x2d/0x70 [ 71.819687][ T8509] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 71.826642][ T8509] [ 71.828977][ T8509] The buggy address belongs to the object at ffff88801bf15000 [ 71.828977][ T8509] which belongs to the cache kmalloc-1k of size 1024 [ 71.848688][ T8509] The buggy address is located 232 bytes inside of [ 71.848688][ T8509] 1024-byte region [ffff88801bf15000, ffff88801bf15400) [ 71.866670][ T8509] The buggy address belongs to the page: [ 71.873046][ T8509] page:ffffea00006fc400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801bf15800 pfn:0x1bf10 [ 71.885835][ T8509] head:ffffea00006fc400 order:3 compound_mapcount:0 compound_pincount:0 [ 71.896778][ T8509] flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) [ 71.906136][ T8509] raw: 00fff00000010200 ffffea00004cd808 ffff888010840888 ffff888010841dc0 [ 71.917263][ T8509] raw: ffff88801bf15800 000000000010000d 00000001ffffffff 0000000000000000 [ 71.926332][ T8509] page dumped because: kasan: bad access detected [ 71.934525][ T8509] [ 71.937034][ T8509] Memory state around the buggy address: [ 71.943227][ T8509] ffff88801bf14f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 71.951380][ T8509] ffff88801bf15000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 71.960777][ T8509] >ffff88801bf15080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 71.969057][ T8509] ^ [ 71.976956][ T8509] ffff88801bf15100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 71.985698][ T8509] ffff88801bf15180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 71.995679][ T8509] ================================================================== [ 72.003978][ T8509] Disabling lock debugging due to kernel taint [ 72.018965][ T8509] Kernel panic - not syncing: panic_on_warn set ... [ 72.026980][ T8509] CPU: 1 PID: 8509 Comm: syz-executor364 Tainted: G B 5.12.0-rc4-next-20210326-syzkaller #0 [ 72.039514][ T8509] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.051353][ T8509] Call Trace: [ 72.055003][ T8509] dump_stack+0x141/0x1d7 [ 72.061740][ T8509] panic+0x306/0x73d [ 72.068476][ T8509] ? __warn_printk+0xf3/0xf3 [ 72.074288][ T8509] ? preempt_schedule_common+0x59/0xc0 [ 72.081383][ T8509] ? create_worker_cb+0xaa/0xc0 [ 72.087129][ T8509] ? preempt_schedule_thunk+0x16/0x18 [ 72.093829][ T8509] ? trace_hardirqs_on+0x38/0x1c0 [ 72.100057][ T8509] ? trace_hardirqs_on+0x51/0x1c0 [ 72.105740][ T8509] ? create_worker_cb+0xaa/0xc0 [ 72.112208][ T8509] ? create_worker_cb+0xaa/0xc0 [ 72.117321][ T8509] end_report.cold+0x5a/0x5a [ 72.123537][ T8509] kasan_report.cold+0x6a/0xd8 [ 72.128945][ T8509] ? create_worker_cb+0xaa/0xc0 [ 72.134262][ T8509] create_worker_cb+0xaa/0xc0 [ 72.139134][ T8509] task_work_run+0xdd/0x1a0 [ 72.143817][ T8509] do_exit+0xbfc/0x2a60 [ 72.148212][ T8509] ? find_held_lock+0x2d/0x110 [ 72.153450][ T8509] ? mm_update_next_owner+0x7a0/0x7a0 [ 72.159636][ T8509] ? lock_downgrade+0x6e0/0x6e0 [ 72.164786][ T8509] ? kick_process+0xe0/0x180 [ 72.169399][ T8509] ? _raw_spin_unlock_irq+0x1f/0x40 [ 72.175813][ T8509] do_group_exit+0x125/0x310 [ 72.180500][ T8509] __x64_sys_exit_group+0x3a/0x50 [ 72.185771][ T8509] do_syscall_64+0x2d/0x70 [ 72.190591][ T8509] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 72.197884][ T8509] RIP: 0033:0x447359 [ 72.201878][ T8509] Code: Unable to access opcode bytes at RIP 0x44732f. [ 72.209570][ T8509] RSP: 002b:00007ffdfb4e3ea8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 72.218327][ T8509] RAX: ffffffffffffffda RBX: 00000000004b8390 RCX: 0000000000447359 [ 72.226508][ T8509] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 72.234611][ T8509] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 [ 72.243505][ T8509] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004b8390 [ 72.252273][ T8509] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 72.262208][ T8509] Kernel Offset: disabled [ 72.267039][ T8509] Rebooting in 86400 seconds..