rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10501 ticks this GP) idle=823c/1/0x4000000000000000 softirq=12176/12176 fqs=5230 rcu: hardirqs softirqs csw/system rcu: number: 1410198 0 0 rcu: cputime: 15747 36752 66 ==> 52530(ms) rcu: (t=10504 jiffies g=11501 q=773 ncpus=2) CPU: 1 PID: 5932 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x90 kernel/kcov.c:287 Code: c0 4c 89 01 48 c7 44 11 08 02 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1e fa 48 8b 04 24 65 48 8b 15 60 d1 7c 7e 65 8b 0d 61 d1 7c RSP: 0018:ffffc900001f03d0 EFLAGS: 00000246 RAX: ffffffff8f197200 RBX: dffffc0000000000 RCX: ffffffff8f1971e6 RDX: ffff88802533bc00 RSI: 000000000002da23 RDI: 000000000002da30 RBP: 000000000002da30 R08: ffffc900001f0570 R09: 0000000000000015 R10: 0000000000000004 R11: 0000000000000100 R12: 000000000002da23 R13: 000000000009c001 R14: 000000000000df2d R15: 0000000000000001 FS: 000055558f2f1500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000001ac6d CR3: 0000000075d4c000 CR4: 00000000003506e0 Call Trace: __orc_find arch/x86/kernel/unwind_orc.c:90 [inline] orc_find arch/x86/kernel/unwind_orc.c:227 [inline] unwind_next_frame+0x2b6/0x2990 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:600 [inline] dst_cow_metrics_generic+0x56/0x1b0 net/core/dst.c:196 dst_metrics_write_ptr include/net/dst.h:133 [inline] dst_metric_set include/net/dst.h:194 [inline] icmp6_dst_alloc+0x237/0x400 net/ipv6/route.c:3333 ndisc_send_skb+0x422/0x1480 net/ipv6/ndisc.c:493 addrconf_rs_timer+0x36b/0x640 net/ipv6/addrconf.c:4029 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x570/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x27d/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:check_preemption_disabled+0x42/0x110 lib/smp_processor_id.c:55 Code: 65 8b 05 dd ca 7f 75 65 8b 0d d2 ca 7f 75 f7 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 08 0f 85 c4 00 00 00 <48> 83 c4 10 5b 41 5e 41 5f 5d c3 48 c7 04 24 00 00 00 00 9c 8f 04 RSP: 0018:ffffc900037678b8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 00007fb60239ce59 RCX: d0761e3ac3f97400 RDX: 0000000000000000 RSI: ffffffff8b1c7bc0 RDI: ffffffff8b1c7b80 RBP: 0000000000000001 R08: ffff88802533bc00 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000000 R12: ffffffff8aa000d0 R13: ffff88802533bc00 R14: dffffc0000000000 R15: 1ffff920006ecf36 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:700 kernel_text_address+0x7b/0xd0 kernel/extable.c:113 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 task_work_add+0xdd/0x470 kernel/task_work.c:82 fput+0xdd/0x1a0 fs/file_table.c:440 filp_close+0x10f/0x150 fs/open.c:1547 __range_close fs/file.c:698 [inline] __close_range+0x379/0x690 fs/file.c:755 __do_sys_close_range fs/open.c:1599 [inline] __se_sys_close_range fs/open.c:1596 [inline] __x64_sys_close_range+0x7a/0x90 fs/open.c:1596 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb60239ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc1d1aa4d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: ffffffffffffffda RBX: 00007ffc1d1aa5c0 RCX: 00007fb60239ce59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000001ac6d R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2c420000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb602615fac R14: 00007fb602615fa8 R15: 00007fb602615fa0