rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10814 ticks this GP) idle=653/1/0x4000000000000000 softirq=5085/5087 fqs=3949 (t=10500 jiffies g=3337 q=58 ncpus=2) NMI backtrace for cpu 0 CPU: 0 PID: 3610 Comm: udevd Not tainted 5.18.0-rc3-next-20220422-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x262/0x3f0 kernel/rcu/tree_stall.h:369 print_cpu_stall kernel/rcu/tree_stall.h:665 [inline] check_cpu_stall kernel/rcu/tree_stall.h:749 [inline] rcu_pending kernel/rcu/tree.c:4068 [inline] rcu_sched_clock_irq.cold+0x144/0x8fc kernel/rcu/tree.c:2755 update_process_times+0x16d/0x200 kernel/time/timer.c:1811 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1473 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:kvm_wait+0x98/0x100 arch/x86/kernel/kvm.c:1058 Code: fa 83 e2 07 38 d0 7f 04 84 c0 75 63 0f b6 07 40 38 c6 74 35 48 83 c4 10 c3 c3 e8 23 91 4b 00 eb 07 0f 00 2d da b1 94 08 fb f4 <48> 83 c4 10 c3 89 74 24 0c 48 89 3c 24 e8 56 8f 4b 00 8b 74 24 0c RSP: 0000:ffffc90000007338 EFLAGS: 00000246 RAX: 0000000000000007 RBX: 0000000000000000 RCX: 1ffffffff1b73199 RDX: 0000000000000000 RSI: ffffffff81807171 RDI: ffffffff8134dffd RBP: ffff88807df64448 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81807158 R11: 0000000000000001 R12: 0000000000000000 R13: ffffed100fbec889 R14: 0000000000000001 R15: ffff8880b9c3ae40 pv_wait arch/x86/include/asm/paravirt.h:603 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x8c7/0xb50 kernel/locking/qspinlock.c:511 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock+0x200/0x2a0 kernel/locking/spinlock_debug.c:115 spin_lock include/linux/spinlock.h:354 [inline] task_lock include/linux/sched/task.h:170 [inline] __get_task_comm+0x23/0x50 fs/exec.c:1219 __set_page_owner_handle mm/page_owner.c:174 [inline] __set_page_owner+0x253/0x380 mm/page_owner.c:192 prep_new_page mm/page_alloc.c:2394 [inline] get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4135 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5356 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2273 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 kmem_cache_alloc_bulk+0x21c/0x720 mm/slub.c:3704 napi_skb_cache_get+0xeb/0x170 net/core/skbuff.c:176 __alloc_skb+0x9b/0x340 net/core/skbuff.c:412 __napi_alloc_skb+0x70/0x310 net/core/skbuff.c:568 napi_alloc_skb include/linux/skbuff.h:3194 [inline] page_to_skb+0x17d/0xc10 drivers/net/virtio_net.c:464 receive_mergeable drivers/net/virtio_net.c:1066 [inline] receive_buf+0xdc5/0x54c0 drivers/net/virtio_net.c:1205 virtnet_receive drivers/net/virtio_net.c:1500 [inline] virtnet_poll+0x5cd/0x11a0 drivers/net/virtio_net.c:1609 __napi_poll+0xb3/0x6e0 net/core/dev.c:6443 napi_poll net/core/dev.c:6510 [inline] net_rx_action+0x8ec/0xc60 net/core/dev.c:6597 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:640 RIP: 0010:check_region_inline mm/kasan/generic.c:169 [inline] RIP: 0010:kasan_check_range+0x9/0x180 mm/kasan/generic.c:189 Code: b6 f5 bf 00 08 00 00 89 43 0c e8 72 e4 ff ff 89 43 08 5b 5d 41 5c c3 66 2e 0f 1f 84 00 00 00 00 00 48 85 f6 0f 84 3c 01 00 00 <49> 89 f9 41 54 44 0f b6 c2 49 01 f1 55 53 0f 82 18 01 00 00 48 b8 RSP: 0000:ffffc90002e2f768 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff88807df64330 RCX: ffffffff841f6e0e RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88807df64330 RBP: 8080808080808080 R08: 0000000000000001 R09: 0000000000000003 R10: fffff520005c5ef0 R11: 0000000000000001 R12: 0000000000000010 R13: 0000000000000000 R14: fefefefefefefeff R15: ffff8880133adb68 read_word_at_a_time+0xe/0x20 include/asm-generic/rwonce.h:85 strscpy+0xa1/0x2a0 lib/string.c:203 strscpy include/linux/fortify-string.h:170 [inline] strscpy_pad+0x20/0x70 lib/string_helpers.c:788 __get_task_comm+0x35/0x50 fs/exec.c:1221 __set_page_owner_handle mm/page_owner.c:174 [inline] __set_page_owner+0x253/0x380 mm/page_owner.c:192 prep_new_page mm/page_alloc.c:2394 [inline] get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4135 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5356 alloc_pages_vma+0xf9/0x770 mm/mempolicy.c:2221 wp_page_copy+0x1f6/0x1e20 mm/memory.c:3105 do_wp_page+0x389/0x1b60 mm/memory.c:3472 handle_pte_fault mm/memory.c:4922 [inline] __handle_mm_fault+0x1fe6/0x33d0 mm/memory.c:5043 handle_mm_fault+0x1c8/0x790 mm/memory.c:5141 do_user_addr_fault+0x489/0x11c0 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1484 [inline] exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1540 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7fd2136c047c Code: 08 4c 39 2c 24 75 eb 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 84 00 00 00 00 00 41 f6 44 07 08 01 0f 84 04 01 00 00 <49> 83 67 08 fe 49 8b 44 24 70 49 89 5c 24 70 48 89 58 18 48 81 fd RSP: 002b:00007ffcdc4862b0 EFLAGS: 00010202 RAX: 0000000000000350 RBX: 00005628d52b6a00 RCX: 00007fd2137f5a60 RDX: 0000562db7a6dbf6 RSI: 0000000000000008 RDI: 0000000000000001 RBP: 0000000000000030 R08: 00005628d52b8940 R09: 0000000000000040 R10: 0000000000000063 R11: 0000000000000077 R12: 00007fd2137f5a00 R13: 00007fd2137f5a18 R14: 00000005628d52b6 R15: 00005628d52b6a30 ---------------- Code disassembly (best guess): 0: fa cli 1: 83 e2 07 and $0x7,%edx 4: 38 d0 cmp %dl,%al 6: 7f 04 jg 0xc 8: 84 c0 test %al,%al a: 75 63 jne 0x6f c: 0f b6 07 movzbl (%rdi),%eax f: 40 38 c6 cmp %al,%sil 12: 74 35 je 0x49 14: 48 83 c4 10 add $0x10,%rsp 18: c3 retq 19: c3 retq 1a: e8 23 91 4b 00 callq 0x4b9142 1f: eb 07 jmp 0x28 21: 0f 00 2d da b1 94 08 verw 0x894b1da(%rip) # 0x894b202 28: fb sti 29: f4 hlt * 2a: 48 83 c4 10 add $0x10,%rsp <-- trapping instruction 2e: c3 retq 2f: 89 74 24 0c mov %esi,0xc(%rsp) 33: 48 89 3c 24 mov %rdi,(%rsp) 37: e8 56 8f 4b 00 callq 0x4b8f92 3c: 8b 74 24 0c mov 0xc(%rsp),%esi