Warning: Permanently added '10.128.1.52' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 734.806974] hrtimer: interrupt took 77600 ns [ 839.822099] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 839.828440] rcu: (detected by 1, t=10502 jiffies, g=4145, q=15) [ 839.834595] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295020982-4295010480), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 839.847245] syz-executor660 R running task 27200 8104 8100 0x00000000 [ 839.854433] Call Trace: [ 839.857007] [ 839.859160] sched_show_task.cold+0x332/0x396 [ 839.863650] ? __se_sys_sched_getattr+0x480/0x480 [ 839.868492] rcu_check_callbacks.cold+0xb37/0xe19 [ 839.873343] update_process_times+0x2a/0x70 [ 839.877658] tick_sched_handle+0x9b/0x180 [ 839.881803] tick_sched_timer+0xfc/0x290 [ 839.885862] __hrtimer_run_queues+0x3f6/0xe60 [ 839.890353] ? tick_nohz_restart_sched_tick+0x310/0x310 [ 839.895718] ? hrtimer_fixup_free+0xa0/0xa0 [ 839.900034] ? kvm_clock_get_cycles+0x14/0x30 [ 839.904522] ? ktime_get_update_offsets_now+0x2ec/0x460 [ 839.909884] hrtimer_interrupt+0x326/0x9e0 [ 839.914125] smp_apic_timer_interrupt+0x10c/0x550 [ 839.918964] apic_timer_interrupt+0xf/0x20 [ 839.923183] [ 839.925416] RIP: 0010:lock_release+0xe/0x8b0 [ 839.929820] Code: 8b 4c 24 10 e9 9f fd ff ff 48 c7 c7 40 f7 36 8d e8 e7 17 4d 00 e9 dc fd ff ff 66 90 48 b8 00 00 00 00 00 fc ff df 41 57 41 56 <41> 55 49 89 d5 41 54 55 48 89 fd 53 48 83 ec 78 48 c7 44 24 18 b3 [ 839.948712] RSP: 0018:ffff88808d1f72e8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 839.956416] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff817c4c87 [ 839.963684] RDX: ffffffff817c4afd RSI: 0000000000000001 RDI: ffffffff89f85fa0 [ 839.970947] RBP: ffffea0002192f80 R08: 0000000000000000 R09: 0000000000000000 [ 839.978209] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 839.985469] R13: ffffea0002192f80 R14: ffff8880b547fc58 R15: dffffc0000000000 [ 839.992748] ? find_get_entry+0x657/0x8a0 [ 839.996893] ? find_get_entry+0x4cd/0x8a0 [ 840.001044] find_get_entry+0x4f4/0x8a0 [ 840.005018] ? find_get_pages_range_tag+0xc50/0xc50 [ 840.010035] pagecache_get_page+0x56/0xd50 [ 840.014271] grab_cache_page_write_begin+0x6a/0xa0 [ 840.019199] ext4_da_write_begin+0x2ba/0x10e0 [ 840.023697] ? mark_held_locks+0xa6/0xf0 [ 840.027759] ? ext4_write_begin+0x1610/0x1610 [ 840.032244] ? iov_iter_init+0x1d0/0x1d0 [ 840.036308] generic_perform_write+0x1f8/0x4d0 [ 840.040892] ? filemap_page_mkwrite+0x2f0/0x2f0 [ 840.045552] ? current_time+0x1c0/0x1c0 [ 840.049524] ? lock_acquire+0x170/0x3c0 [ 840.053493] __generic_file_write_iter+0x24b/0x610 [ 840.058420] ext4_file_write_iter+0x2fe/0xf20 [ 840.062910] ? kasan_kmalloc+0x139/0x160 [ 840.066965] ? ext4_file_open+0x600/0x600 [ 840.071104] ? iter_file_splice_write+0x168/0xbb0 [ 840.075941] ? direct_splice_actor+0x115/0x160 [ 840.080516] ? splice_direct_to_actor+0x33f/0x8d0 [ 840.085352] ? do_sendfile+0x550/0xc30 [ 840.089234] ? __se_sys_sendfile64+0xc4/0x160 [ 840.093724] ? do_syscall_64+0xf9/0x620 [ 840.097693] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 840.103054] ? common_file_perm+0x4e5/0x850 [ 840.107376] do_iter_readv_writev+0x668/0x790 [ 840.111868] ? clone_verify_area+0x240/0x240 [ 840.116385] ? mark_held_locks+0xa6/0xf0 [ 840.120460] ? security_file_permission+0x1c0/0x220 [ 840.125481] do_iter_write+0x182/0x5d0 [ 840.129372] vfs_iter_write+0x70/0xa0 [ 840.133186] iter_file_splice_write+0x60d/0xbb0 [ 840.137972] ? splice_from_pipe_next.part.0+0x360/0x360 [ 840.143341] ? security_file_permission+0x105/0x220 [ 840.148366] ? security_file_permission+0x1c0/0x220 [ 840.153397] ? splice_from_pipe_next.part.0+0x360/0x360 [ 840.158759] direct_splice_actor+0x115/0x160 [ 840.163180] splice_direct_to_actor+0x33f/0x8d0 [ 840.167848] ? generic_pipe_buf_nosteal+0x10/0x10 [ 840.172705] ? do_splice_to+0x160/0x160 [ 840.176684] do_splice_direct+0x1a7/0x270 [ 840.180826] ? splice_direct_to_actor+0x8d0/0x8d0 [ 840.185670] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 840.190685] do_sendfile+0x550/0xc30 [ 840.194401] ? do_compat_pwritev64+0x1b0/0x1b0 [ 840.198981] ? __might_fault+0x192/0x1d0 [ 840.203041] __se_sys_sendfile64+0xc4/0x160 [ 840.207354] ? __se_sys_sendfile+0x180/0x180 [ 840.211763] ? trace_hardirqs_off_caller+0x6e/0x210 [ 840.216775] ? do_syscall_64+0x21/0x620 [ 840.220749] do_syscall_64+0xf9/0x620 [ 840.224547] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 840.229727] RIP: 0033:0x7fc26a3a76b9 [ 840.233452] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 840.252345] RSP: 002b:00007ffe71fb5248 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 840.260053] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc26a3a76b9 [ 840.267319] RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003 [ 840.274579] RBP: 0000000000000000 R08: 00007ffe71fb5270 R09: 00007ffe71fb5270 [ 840.281840] R10: 000000000200a198 R11: 0000000000000246 R12: 00007ffe71fb526c [ 840.289100] R13: 0000000000000000 R14: 00007ffe71fb5280 R15: 0000000000000000 [ 840.296389] rcu: rcu_preempt kthread starved for 10502 jiffies! g4145 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 840.306772] rcu: RCU grace-period kthread stack dump: [ 840.311950] rcu_preempt R running task 29208 10 2 0x80000000 [ 840.319139] Call Trace: [ 840.321724] __schedule+0x887/0x2040 [ 840.325436] ? io_schedule_timeout+0x140/0x140 [ 840.330013] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 840.335109] schedule+0x8d/0x1b0 [ 840.338472] schedule_timeout+0x4cf/0xfe0 [ 840.342615] ? prepare_to_swait_event+0x5b/0x540 [ 840.347371] ? usleep_range+0x170/0x170 [ 840.351338] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 840.356443] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 840.361022] ? collect_expired_timers+0x2a0/0x2a0 [ 840.365857] ? swake_up_all+0x340/0x340 [ 840.369832] rcu_gp_kthread+0xdad/0x21c0 [ 840.373897] ? lock_acquire+0x170/0x3c0 [ 840.377864] ? __rcu_read_unlock+0x160/0x160 [ 840.382270] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 840.387372] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 840.391950] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 840.397047] ? __kthread_parkme+0x133/0x1e0 [ 840.401379] ? __rcu_read_unlock+0x160/0x160 [ 840.405784] kthread+0x33f/0x460 [ 840.409144] ? kthread_park+0x180/0x180 [ 840.413119] ret_from_fork+0x24/0x30 executing program executing program executing program