rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10510 ticks this GP) idle=92f/1/0x4000000000000000 softirq=54773/54775 fqs=3022 (t=10502 jiffies g=89641 q=1745) NMI backtrace for cpu 1 CPU: 1 PID: 21554 Comm: syz-executor.4 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3878 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __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:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:strlen+0x54/0x90 lib/string.c:487 Code: 75 48 80 7d 00 00 74 39 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a <38> ca 7f 04 84 d2 75 1f 80 38 00 75 de 48 83 c4 08 48 29 e8 5b 5d RSP: 0018:ffffc90019d5fc00 EFLAGS: 00000202 RAX: ffffffff898a5927 RBX: dffffc0000000000 RCX: 0000000000000007 RDX: 0000000000000000 RSI: ffff888092212428 RDI: ffffffff898a5920 RBP: ffffffff898a5920 R08: 0000000000000000 R09: ffffffff8d6edcd7 R10: fffffbfff1addb9a R11: 0000000000000000 R12: ffff888092212428 R13: ffffffff8b87fd20 R14: ffff888092212428 R15: ffffc90019d5fcd0 strlen include/linux/fortify-string.h:102 [inline] trace_event_get_offsets_lock include/trace/events/lock.h:39 [inline] perf_trace_lock+0xb1/0x4d0 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4a8/0x720 kernel/locking/lockdep.c:5636 __might_fault mm/memory.c:5273 [inline] __might_fault+0x142/0x170 mm/memory.c:5258 do_pages_move mm/migrate.c:1799 [inline] kernel_move_pages+0x357/0x14b0 mm/migrate.c:2032 __do_sys_move_pages mm/migrate.c:2046 [inline] __se_sys_move_pages mm/migrate.c:2041 [inline] __x64_sys_move_pages+0xdd/0x1b0 mm/migrate.c:2041 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f11b4b6fae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f11b20e5188 EFLAGS: 00000246 ORIG_RAX: 0000000000000117 RAX: ffffffffffffffda RBX: 00007f11b4c82f60 RCX: 00007f11b4b6fae9 RDX: 0000000020000200 RSI: 20000000000000a2 RDI: 0000000000000000 RBP: 00007f11b4bc9f25 R08: 00000000200002c0 R09: 0000000000000000 R10: 000000002026bfec R11: 0000000000000246 R12: 0000000000000000 R13: 00007f11b51b6b2f R14: 00007f11b20e5300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 75 48 jne 0x4a 2: 80 7d 00 00 cmpb $0x0,0x0(%rbp) 6: 74 39 je 0x41 8: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx f: fc ff df 12: 48 89 e8 mov %rbp,%rax 15: 48 83 c0 01 add $0x1,%rax 19: 48 89 c2 mov %rax,%rdx 1c: 48 89 c1 mov %rax,%rcx 1f: 48 c1 ea 03 shr $0x3,%rdx 23: 83 e1 07 and $0x7,%ecx 26: 0f b6 14 1a movzbl (%rdx,%rbx,1),%edx * 2a: 38 ca cmp %cl,%dl <-- trapping instruction 2c: 7f 04 jg 0x32 2e: 84 d2 test %dl,%dl 30: 75 1f jne 0x51 32: 80 38 00 cmpb $0x0,(%rax) 35: 75 de jne 0x15 37: 48 83 c4 08 add $0x8,%rsp 3b: 48 29 e8 sub %rbp,%rax 3e: 5b pop %rbx 3f: 5d pop %rbp