rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=10753, q=419) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294974951-4294964449), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 26408 9586 9047 0x00004000 Call Trace: sched_show_task kernel/sched/core.c:5285 [inline] sched_show_task.cold+0x291/0x2fc kernel/sched/core.c:5260 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline] check_cpu_stall kernel/rcu/tree_stall.h:536 [inline] rcu_pending kernel/rcu/tree.c:2625 [inline] rcu_sched_clock_irq.cold+0xabc/0xc13 kernel/rcu/tree.c:2161 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1388 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1450 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1508 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] smp_apic_timer_interrupt+0x12a/0x5b0 arch/x86/kernel/apic/apic.c:1066 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806 RIP: 0010:__might_sleep+0x3a/0x190 kernel/sched/core.c:6079 Code: 41 89 d6 41 55 41 89 f5 41 54 49 89 fc 53 65 48 8b 1c 25 c0 fd 01 00 48 8d 7b 10 48 83 ec 10 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 0e 01 00 00 48 8b 43 10 48 85 c0 74 3e 65 48 8b 1c 25 c0 fd RSP: 0018:ffff88808eb5f1e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff888060574040 RCX: ffffc9000a213000 RDX: 1ffff1100c0ae80a RSI: 00000000000017a3 RDI: ffff888060574050 RBP: ffff88808eb5f210 R08: ffff888060574040 R09: ffffed1042cfa4d2 R10: ffffed1042cfa4d1 R11: ffff8882167d268f R12: ffffffff879bb320 R13: 00000000000017a3 R14: 0000000000000000 R15: ffffea0001dc4dc0 ext4_mark_inode_dirty+0xfe/0x9b0 fs/ext4/inode.c:6051 ext4_dirty_inode+0x8f/0xc0 fs/ext4/inode.c:6092 __mark_inode_dirty+0x68e/0x1390 fs/fs-writeback.c:2167 mark_inode_dirty include/linux/fs.h:2138 [inline] __generic_write_end+0xad/0x130 fs/buffer.c:2155 generic_write_end+0x74/0x1a0 fs/buffer.c:2199 ext4_da_write_end+0x205/0xa50 fs/ext4/inode.c:3211 generic_perform_write+0x2fe/0x530 mm/filemap.c:3286 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3404 ext4_file_write_iter+0x373/0x1430 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1870 [inline] do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x184/0x610 fs/read_write.c:951 vfs_iter_write+0x77/0xb0 fs/read_write.c:983 iter_file_splice_write+0x66d/0xbe0 fs/splice.c:746 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1020 splice_direct_to_actor+0x366/0x970 fs/splice.c:975 do_splice_direct+0x1da/0x2a0 fs/splice.c:1063 do_sendfile+0x597/0xd00 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1511 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe632a86c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004592c9 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 00008000fffffffe R11: 0000000000000246 R12: 00007fe632a876d4 R13: 00000000004c689d R14: 00000000004db828 R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10502 jiffies! g10753 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29800 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3444 schedule+0xa8/0x270 kernel/sched/core.c:3508 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1589 [inline] rcu_gp_kthread+0x9b2/0x18d0 kernel/rcu/tree.c:1746 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352