rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=47a/1/0x4000000000000002 softirq=10674/10674 fqs=8 (t=10500 jiffies g=6553 q=616) rcu: rcu_preempt kthread starved for 10480 jiffies! g6553 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29032 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 8286 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:70 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x50 kernel/kcov.c:102 Code: cd 07 48 89 de e8 64 02 3b 00 5b 5d c3 cc 48 8b 04 24 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e f7 c2 00 01 1f 00 75 2c <8b> 91 80 13 00 00 83 fa 02 75 21 48 8b 91 88 13 00 00 48 8b 32 48 RSP: 0018:ffffc900027e7880 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81487326 RBX: ffffea00029c4000 RCX: ffff8880a7406200 RDX: 0000000000000001 RSI: 00000000fffffffc RDI: ffffea00029c4000 RBP: ffffc900027e78a8 R08: 000000000003a768 R09: ffffed1011e80aaf R10: ffffed1011e80aaf R11: 0000000000000000 R12: ffff888093b9dc20 R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff88808f405568 free_thread_stack+0x168/0x590 kernel/fork.c:280 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:anon_vma_interval_tree_verify+0x2f/0x150 mm/interval_tree.c:108 Code: 57 41 56 41 55 41 54 53 49 89 ff 49 bc 00 00 00 00 00 fc ff df e8 91 7a d5 ff 49 8d 7f 40 48 89 f8 48 c1 e8 03 42 80 3c 20 00 <74> 05 e8 7a f1 10 00 4d 8b 77 40 4d 89 fd 49 c1 ed 03 43 80 7c 25 RSP: 0018:ffffc900027e7b08 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02 RAX: 1ffff11014f4a1e4 RBX: ffff8880a7a50ef0 RCX: ffff8880a7406200 RDX: 0000000000000000 RSI: 000000000000011b RDI: ffff8880a7a50f20 RBP: ffffc900027e7b30 R08: ffffffff81a12273 R09: ffffed1013451d2f R10: ffffed1013451d2f R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880a48bd1c0 R14: 1ffff11014f7e65a R15: ffff8880a7a50ee0 validate_mm+0xfe/0x9b0 mm/mmap.c:409 vma_link+0x264/0x290 mm/mmap.c:666 mmap_region+0x12e1/0x1cb0 mm/mmap.c:1807 do_mmap+0xabb/0x1120 mm/mmap.c:1555 do_mmap_pgoff include/linux/mm.h:2338 [inline] vm_mmap_pgoff+0x13d/0x1d0 mm/util.c:506 ksys_mmap_pgoff+0x104/0x560 mm/mmap.c:1607 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a6ca Code: 89 f5 41 54 49 89 fc 55 53 74 35 49 63 e8 48 63 da 4d 89 f9 49 89 e8 4d 63 d6 48 89 da 4c 89 ee 4c 89 e7 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 4e 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 00 RSP: 002b:00007ffc0e1c7b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a6ca RDX: 0000000000000003 RSI: 0000000000021000 RDI: 0000000000000000 RBP: ffffffffffffffff R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000021000 R14: 0000000000020022 R15: 0000000000000000