Warning: Permanently added '10.128.0.120' (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 syzkaller login: [ 335.930249][ T9432] ================================================================== [ 335.938769][ T9432] BUG: KASAN: null-ptr-deref in kthread_use_mm+0x11c/0x2a0 [ 335.945971][ T9432] Write of size 4 at addr 0000000000000060 by task io_uring-sq/9432 [ 335.953942][ T9432] [ 335.956282][ T9432] CPU: 1 PID: 9432 Comm: io_uring-sq Not tainted 5.10.0-rc1-next-20201030-syzkaller #0 [ 335.965901][ T9432] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 335.976015][ T9432] Call Trace: [ 335.979344][ T9432] dump_stack+0x107/0x163 [ 335.983681][ T9432] ? kthread_use_mm+0x11c/0x2a0 [ 335.988532][ T9432] ? kthread_use_mm+0x11c/0x2a0 [ 335.993406][ T9432] kasan_report.cold+0x5/0x37 [ 335.998092][ T9432] ? kthread_use_mm+0x11c/0x2a0 [ 336.002996][ T9432] check_memory_region+0x13d/0x180 [ 336.008111][ T9432] kthread_use_mm+0x11c/0x2a0 [ 336.012835][ T9432] __io_sq_thread_acquire_mm+0x1c4/0x220 [ 336.018481][ T9432] io_sq_thread_acquire_mm_files.isra.0+0x125/0x180 [ 336.025072][ T9432] io_submit_sqes+0x89d/0x25f0 [ 336.029860][ T9432] ? io_queue_sqe+0xed0/0xed0 [ 336.034712][ T9432] ? io_sq_thread+0x42c/0x1630 [ 336.039545][ T9432] ? do_raw_spin_lock+0x120/0x2b0 [ 336.044599][ T9432] ? rwlock_bug.part.0+0x90/0x90 [ 336.049556][ T9432] ? _raw_spin_unlock_irq+0x1f/0x40 [ 336.054766][ T9432] io_sq_thread+0x462/0x1630 [ 336.059384][ T9432] ? __do_sys_io_uring_enter+0x1b50/0x1b50 [ 336.065212][ T9432] ? lockdep_hardirqs_on+0x79/0x100 [ 336.070415][ T9432] ? __kthread_parkme+0x13f/0x1e0 [ 336.075441][ T9432] ? __do_sys_io_uring_enter+0x1b50/0x1b50 [ 336.081253][ T9432] kthread+0x3af/0x4a0 [ 336.085346][ T9432] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 336.091275][ T9432] ret_from_fork+0x1f/0x30 [ 336.095708][ T9432] ================================================================== [ 336.103775][ T9432] Disabling lock debugging due to kernel taint [ 336.109919][ T9432] Kernel panic - not syncing: panic_on_warn set ... [ 336.116508][ T9432] CPU: 1 PID: 9432 Comm: io_uring-sq Tainted: G B 5.10.0-rc1-next-20201030-syzkaller #0 [ 336.127526][ T9432] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 336.137574][ T9432] Call Trace: [ 336.140869][ T9432] dump_stack+0x107/0x163 [ 336.145210][ T9432] ? kthread_use_mm+0xe0/0x2a0 [ 336.150016][ T9432] panic+0x306/0x73d [ 336.154015][ T9432] ? __warn_printk+0xf3/0xf3 [ 336.158610][ T9432] ? ret_from_fork+0x1f/0x30 [ 336.163202][ T9432] ? kthread_use_mm+0x11c/0x2a0 [ 336.168053][ T9432] ? kthread_use_mm+0x11c/0x2a0 [ 336.172895][ T9432] end_report+0x58/0x5e [ 336.177052][ T9432] kasan_report.cold+0xd/0x37 [ 336.181720][ T9432] ? kthread_use_mm+0x11c/0x2a0 [ 336.186563][ T9432] check_memory_region+0x13d/0x180 [ 336.191667][ T9432] kthread_use_mm+0x11c/0x2a0 [ 336.196338][ T9432] __io_sq_thread_acquire_mm+0x1c4/0x220 [ 336.201967][ T9432] io_sq_thread_acquire_mm_files.isra.0+0x125/0x180 [ 336.208551][ T9432] io_submit_sqes+0x89d/0x25f0 [ 336.213311][ T9432] ? io_queue_sqe+0xed0/0xed0 [ 336.217977][ T9432] ? io_sq_thread+0x42c/0x1630 [ 336.222734][ T9432] ? do_raw_spin_lock+0x120/0x2b0 [ 336.227750][ T9432] ? rwlock_bug.part.0+0x90/0x90 [ 336.232679][ T9432] ? _raw_spin_unlock_irq+0x1f/0x40 [ 336.237869][ T9432] io_sq_thread+0x462/0x1630 [ 336.242479][ T9432] ? __do_sys_io_uring_enter+0x1b50/0x1b50 [ 336.248286][ T9432] ? lockdep_hardirqs_on+0x79/0x100 [ 336.253484][ T9432] ? __kthread_parkme+0x13f/0x1e0 [ 336.258613][ T9432] ? __do_sys_io_uring_enter+0x1b50/0x1b50 [ 336.264427][ T9432] kthread+0x3af/0x4a0 [ 336.268499][ T9432] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 336.274389][ T9432] ret_from_fork+0x1f/0x30 [ 336.279721][ T9432] Kernel Offset: disabled [ 336.284109][ T9432] Rebooting in 86400 seconds..