rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=28929, q=189) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294976411-4294965908), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 25272 13836 9090 0x00004000 Call Trace: sched_show_task+0x411/0x560 kernel/sched/core.c:5954 print_other_cpu_stall kernel/rcu/tree_stall.h:430 [inline] check_cpu_stall kernel/rcu/tree_stall.h:558 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq+0x188c/0x1aa0 kernel/rcu/tree.c:2276 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:171 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x3f3/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x37c/0xda0 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_is_held_type+0x25c/0x2b0 kernel/locking/lockdep.c:4523 Code: d0 d2 2a 89 48 c1 e8 03 42 80 3c 30 00 74 0c 48 c7 c7 d0 d2 2a 89 e8 f3 44 58 00 48 83 3d eb f1 ce 07 00 74 56 4c 89 e7 57 9d <0f> 1f 44 00 00 89 d8 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 RSP: 0018:ffffc90006477808 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1255a5a RBX: 0000000000000000 RCX: 0000000000000002 RDX: dffffc0000000000 RSI: ffff88804e506960 RDI: 0000000000000282 RBP: ffffc90006477858 R08: ffffffff8197165e R09: fffff52000c8ef1c R10: fffff52000c8ef1c R11: 0000000000000000 R12: 0000000000000282 R13: ffff88804e506914 R14: dffffc0000000000 R15: 1ffff11009ca0d22 lock_is_held include/linux/lockdep.h:361 [inline] xa_entry include/linux/xarray.h:1180 [inline] xas_reload+0x114/0x200 include/linux/xarray.h:1527 find_get_entry+0x380/0x840 mm/filemap.c:1529 pagecache_get_page+0x4a/0xd30 mm/filemap.c:1613 find_get_page include/linux/pagemap.h:260 [inline] generic_file_buffered_read+0x391/0x2570 mm/filemap.c:2025 generic_file_read_iter+0xa9/0x450 mm/filemap.c:2302 ext4_file_read_iter+0x48e/0x770 fs/ext4/file.c:73 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x504/0x820 fs/splice.c:313 do_splice_to fs/splice.c:892 [inline] splice_direct_to_actor+0x3c9/0xb90 fs/splice.c:971 do_splice_direct+0x200/0x330 fs/splice.c:1080 do_sendfile+0x7e4/0xfd0 fs/read_write.c:1520 __do_sys_sendfile64 fs/read_write.c:1581 [inline] __se_sys_sendfile64 fs/read_write.c:1567 [inline] __x64_sys_sendfile64+0x176/0x1b0 fs/read_write.c:1567 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c6c9 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff466da9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ff466daa6d4 RCX: 000000000045c6c9 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000005 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 00008400fffffffb R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008cb R14: 00000000004cb58f R15: 000000000076bf2c rcu: rcu_preempt kthread starved for 10536 jiffies! g28929 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28952 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3386 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4082 schedule+0x188/0x210 kernel/sched/core.c:4156 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1658 [inline] rcu_gp_kthread+0xe8d/0x17e0 kernel/rcu/tree.c:1818 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352