rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=221857, q=2936) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295078977-4295068474), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.0 R running task 28416 330 8175 0x00000008 Call Trace: sched_show_task kernel/sched/core.c:5338 [inline] sched_show_task.cold+0x2e2/0x343 kernel/sched/core.c:5313 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline] check_cpu_stall kernel/rcu/tree.c:1557 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0xaf0/0xddc kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1638 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline] RIP: 0010:hlist_empty include/linux/list.h:671 [inline] RIP: 0010:perf_trace_timer_expire_entry+0x128/0x4e0 include/trace/events/timer.h:90 Code: 7e 79 0f 00 48 8b b5 50 ff ff ff 48 85 f6 75 41 e8 dd 77 0f 00 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 9b 03 00 00 48 8b 33 31 ff 48 89 b5 50 ff ff ff e8 41 79 0f RSP: 0018:ffff8880ae707c70 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffe8ffffdd3378 RCX: ffffffff81582ae2 RDX: 1ffffd1ffffba66f RSI: ffffffff81582af3 RDI: 0000000000000007 RBP: ffff8880ae707d30 R08: ffff888036310300 R09: 0000000000000002 R10: ffff888036310bd0 R11: ffffffff8b1c38b0 R12: 1ffff11015ce0f91 R13: ffffffff88ba1080 R14: ffff888016f73a50 R15: ffff8880ae707d08 trace_timer_expire_entry include/trace/events/timer.h:90 [inline] call_timer_fn+0x471/0x700 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x5d0/0x1540 kernel/time/timer.c:1697 __do_softirq+0x26c/0x93c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:unwind_next_frame+0x9a7/0x18a0 arch/x86/kernel/unwind_orc.c:408 Code: 83 e0 07 40 38 c6 40 0f 9e c7 40 84 f6 0f 95 c0 40 84 c7 0f 85 4d 0a 00 00 48 0f bf 01 48 01 d0 48 89 44 24 60 e9 55 fa ff ff <48> b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f RSP: 0018:ffff88803babf658 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000005 RBX: 1ffff11007757ed3 RCX: ffffffff89fb9e56 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff89fb9e5a R09: 0000000000000001 R10: 0000000000033921 R11: 0000000000064071 R12: ffff88803babf778 R13: ffff88803babf765 R14: ffff88803babf768 R15: ffff88803babf730 __save_stack_trace+0x7a/0xf0 arch/x86/kernel/stacktrace.c:44 save_stack+0x32/0xa0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc+0x114/0x710 mm/slab.c:3557 ext4_alloc_inode+0x1a/0x630 fs/ext4/super.c:1080 alloc_inode+0x5d/0x180 fs/inode.c:210 new_inode_pseudo+0x14/0xe0 fs/inode.c:910 new_inode+0x1b/0x40 fs/inode.c:939 __ext4_new_inode+0x403/0x5b00 fs/ext4/ialloc.c:832 ext4_mkdir+0x396/0xd90 fs/ext4/namei.c:2656 vfs_mkdir+0x419/0x690 fs/namei.c:3819 do_mkdirat+0x21e/0x280 fs/namei.c:3842 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c4a9 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:00007f9fdf6edc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007f9fdf6ee6d4 RCX: 000000000045c4a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000072d R14: 00000000004c1fb8 R15: 000000000076bf2c rcu: rcu_preempt kthread starved for 10561 jiffies! g221857 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29136 10 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806 rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415