rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10502 jiffies, g=253857, q=493) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295127124-4295116621), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 27784 26240 8234 0x00000008 Call Trace: sched_show_task kernel/sched/core.c:5338 [inline] sched_show_task.cold+0x2ee/0x35d 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+0xaa1/0xd90 kernel/rcu/tree.c:2682 update_process_times+0x32/0x80 kernel/time/timer.c:1638 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:168 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:trace_timer_expire_exit include/trace/events/timer.h:121 [inline] RIP: 0010:call_timer_fn+0x507/0x720 kernel/time/timer.c:1327 Code: 9b a6 7e 48 8b 05 d1 bb 6b 08 e8 94 c9 fc ff 31 ff 89 c3 89 c6 e8 39 ba 0f 00 85 db 74 1d e8 b0 b8 0f 00 0f b6 1d 64 5d 6b 08 <31> ff 89 de e8 e0 b9 0f 00 84 db 0f 84 10 01 00 00 e8 93 b8 0f 00 RSP: 0018:ffff8880ae807d18 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: ffff88803e538680 RBX: 0000000000000000 RCX: ffffffff815b52c7 RDX: 0000000000000100 RSI: ffffffff815b52d0 RDI: 0000000000000005 RBP: ffff8880ae807dd8 R08: ffff88803e538680 R09: ffff88803e538f20 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000100 R13: ffff8880ae807db0 R14: 1ffff11015d00fa6 R15: 0000000000000000 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+0x64f/0x16a0 kernel/time/timer.c:1697 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:kasan_kmalloc+0x86/0xf0 mm/kasan/kasan.c:552 Code: fc 00 00 00 49 29 c6 48 b8 00 00 00 00 00 fc ff df 4a 8d 14 33 48 8d 3c 01 48 c1 ea 03 48 29 ca e8 af fe ae 05 41 f6 47 23 08 <75> 21 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 89 55 d0 e8 RSP: 0018:ffff88802aa07998 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: ffffed10089e1fc9 RBX: ffff888044f0fe48 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000000000fc RDI: ffffed10089e1fc9 RBP: ffff88802aa079c8 R08: ffff88803e538680 R09: ffffed10089e1fc9 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000006080c0 R13: ffff888044f0fc80 R14: 0000000000000000 R15: ffff8880a0f56e00 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc+0x11b/0x700 mm/slab.c:3557 kmem_cache_zalloc include/linux/slab.h:699 [inline] __alloc_file+0x27/0x330 fs/file_table.c:100 alloc_empty_file+0x72/0x170 fs/file_table.c:150 path_openat+0x100/0x44a0 fs/namei.c:3526 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3fe/0x550 fs/open.c:1088 __do_sys_openat fs/open.c:1115 [inline] __se_sys_openat fs/open.c:1109 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1109 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b399 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:00007facba084c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007facba0856d4 RCX: 000000000045b399 RDX: 0000000000002002 RSI: 0000000020000540 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007a7 R14: 00000000004c90cd R15: 000000000075bf2c