rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=17033, q=62) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294976507-4294966004), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.4 R running task 25504 12627 10048 0x00004000 Call Trace: sched_show_task kernel/sched/core.c:5952 [inline] sched_show_task.cold+0x2ee/0x35d kernel/sched/core.c:5927 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:3208 [inline] rcu_sched_clock_irq.cold+0xbee/0xd22 kernel/rcu/tree.c:2279 update_process_times+0x2d/0x70 kernel/time/timer.c:1727 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:171 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:debug_lockdep_rcu_enabled+0x26/0xa0 kernel/rcu/update.c:263 Code: 00 00 00 00 48 c7 c0 78 05 a6 8a 55 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 89 e5 48 c1 e9 03 83 c0 03 0f b6 14 11 <38> d0 7c 04 84 d2 75 49 8b 15 94 45 44 09 85 d2 74 3b 48 c7 c0 94 RSP: 0018:ffffc9000c0e7480 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000003 RBX: 0000000000000000 RCX: 1ffffffff154c0af RDX: 0000000000000000 RSI: ffffffff81894904 RDI: 0000000000000004 RBP: ffffc9000c0e7480 R08: ffff88804f4b8280 R09: ffffed1015d07084 R10: ffffed1015d07083 R11: ffff8880ae83841b R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 rcu_read_unlock include/linux/rcupdate.h:651 [inline] is_bpf_image_address+0x190/0x290 kernel/bpf/trampoline.c:94 kernel_text_address+0xe9/0x110 kernel/extable.c:152 __kernel_text_address+0xd/0x40 kernel/extable.c:104 unwind_get_return_address arch/x86/kernel/unwind_frame.c:19 [inline] unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:14 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8f/0xc0 kernel/stacktrace.c:123 save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:523 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] __do_kmalloc mm/slab.c:3654 [inline] __kmalloc+0x14c/0x770 mm/slab.c:3665 kmalloc_array include/linux/slab.h:597 [inline] kcalloc include/linux/slab.h:608 [inline] iter_file_splice_write+0x16e/0xc10 fs/splice.c:702 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1037 splice_direct_to_actor+0x3b4/0xa30 fs/splice.c:992 do_splice_direct+0x1da/0x2a0 fs/splice.c:1080 do_sendfile+0x597/0xd00 fs/read_write.c:1520 __do_sys_sendfile64 fs/read_write.c:1575 [inline] __se_sys_sendfile64 fs/read_write.c:1567 [inline] __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1567 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c6b9 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:00007fa8eb720c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fa8eb7216d4 RCX: 000000000045c6b9 RDX: 00000000200001c0 RSI: 0000000000000007 RDI: 0000000000000007 RBP: 000000000076c100 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008d0 R14: 00000000004cb5c8 R15: 000000000076c10c rcu: rcu_preempt kthread starved for 10562 jiffies! g17033 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29232 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3380 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4080 schedule+0xdc/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x36e/0x8c0 kernel/time/timer.c:1896 rcu_gp_fqs_loop kernel/rcu/tree.c:1656 [inline] rcu_gp_kthread+0xa02/0x1b00 kernel/rcu/tree.c:1819 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352