rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=019/1/0x4000000000000000 softirq=181806/181807 fqs=4993 (t=10500 jiffies g=323357 q=30661) NMI backtrace for cpu 1 CPU: 1 PID: 1280 Comm: syz-executor.5 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:unwind_next_frame+0x53/0x1ce0 arch/x86/kernel/unwind_orc.c:420 Code: 5c 24 40 48 c7 44 24 48 d9 45 16 8b 48 c1 eb 03 48 c7 44 24 50 20 1a 34 81 48 8d 14 03 c7 02 f1 f1 f1 f1 c7 42 04 00 f3 f3 f3 <48> 89 fa 65 48 8b 34 25 28 00 00 00 48 89 b4 24 98 00 00 00 31 f6 RSP: 0018:ffffc900164d7598 EFLAGS: 00000a06 RAX: dffffc0000000000 RBX: 1ffff92002c9aebb RCX: 0000000000000000 RDX: fffff52002c9aebb RSI: ffffffff81e338d7 RDI: ffffc900164d7670 RBP: ffffc900164d76f8 R08: ffffffff8df76ee4 R09: 0000000000000001 R10: fffff52002c9aed9 R11: 000000000008608a R12: ffffc900164d7728 R13: 0000000000000000 R14: ffffc900164d7670 R15: ffff888099e37200 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:590 [inline] io_add_buffers fs/io_uring.c:4405 [inline] io_provide_buffers fs/io_uring.c:4439 [inline] io_issue_sqe+0x2887/0x7010 fs/io_uring.c:6705 __io_queue_sqe fs/io_uring.c:6974 [inline] io_queue_sqe fs/io_uring.c:7016 [inline] io_submit_sqe fs/io_uring.c:7219 [inline] io_submit_sqes+0x1bca/0x8a20 fs/io_uring.c:7325 __do_sys_io_uring_enter+0xf6e/0x1f50 fs/io_uring.c:10039 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: 0033:0x7f8aa6df6ae9 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:00007f8aa436c188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f8aa6f09f60 RCX: 00007f8aa6df6ae9 RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000003 RBP: 00007f8aa6e50f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8aa743db2f R14: 00007f8aa436c300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 5c pop %rsp 1: 24 40 and $0x40,%al 3: 48 c7 44 24 48 d9 45 movq $0xffffffff8b1645d9,0x48(%rsp) a: 16 8b c: 48 c1 eb 03 shr $0x3,%rbx 10: 48 c7 44 24 50 20 1a movq $0xffffffff81341a20,0x50(%rsp) 17: 34 81 19: 48 8d 14 03 lea (%rbx,%rax,1),%rdx 1d: c7 02 f1 f1 f1 f1 movl $0xf1f1f1f1,(%rdx) 23: c7 42 04 00 f3 f3 f3 movl $0xf3f3f300,0x4(%rdx) * 2a: 48 89 fa mov %rdi,%rdx <-- trapping instruction 2d: 65 48 8b 34 25 28 00 mov %gs:0x28,%rsi 34: 00 00 36: 48 89 b4 24 98 00 00 mov %rsi,0x98(%rsp) 3d: 00 3e: 31 f6 xor %esi,%esi