rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2691 jiffies s: 92669 root: 0x2/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 15721 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:__sanitizer_cov_trace_cmp8+0x7a/0x80 kernel/kcov.c:294 Code: c1 e1 05 4c 8d 51 28 4d 39 ca 77 1e 49 ff c0 4c 89 02 48 c7 44 0a 08 06 00 00 00 48 89 7c 0a 10 48 89 74 0a 18 48 89 44 0a 20 0f 1f 44 00 00 48 8b 04 24 65 48 8b 15 e4 38 80 7e 65 8b 0d e5 RSP: 0018:ffffc900001e0258 EFLAGS: 00000046 RAX: ffffffff8139ed8c RBX: 00000000b8f3bbf0 RCX: ffff8880537e9e00 RDX: 0000000000000100 RSI: ffff888138f3bbf0 RDI: 00000000b8f3bbf0 RBP: 0000000000000001 R08: ffff8880b8f3bbfb R09: 1ffff110171e777f R10: dffffc0000000000 R11: ffffed10171e7780 R12: 0000000000000000 R13: dffffc0000000001 R14: ffff888138f3bbf0 R15: ffff8880b8f3bbf8 FS: 0000555578358500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffee1d8e88c CR3: 000000005df7f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __virt_addr_valid+0x4c/0x540 arch/x86/mm/physaddr.c:61 kasan_addr_to_slab+0x9/0xc0 mm/kasan/common.c:36 __kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:471 irq_work_queue_on+0x10f/0x260 kernel/irq_work.c:140 rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728 RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 a2 7c 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc900001e0760 EFLAGS: 00000206 RAX: dcd8e8f633bbdf00 RBX: 1ffff9200003c0f4 RCX: dcd8e8f633bbdf00 RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0 RBP: ffffc900001e0860 R08: ffffffff90b0f337 R09: 1ffffffff2161e66 R10: dffffc0000000000 R11: fffffbfff2161e67 R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] ndisc_send_skb+0xdc2/0x1520 net/ipv6/ndisc.c:521 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3986 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x291/0x910 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:cmpxchg_double_slab+0x3/0x350 mm/slub.c:548 Code: 89 e7 48 c7 c6 0c ae 55 8c e8 a9 75 ea ff 0f 0b 48 89 df 48 c7 c6 0c ae 55 8c e8 98 75 ea ff 0f 0b 66 0f 1f 44 00 00 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 10 4c 89 c3 49 89 cf 49 89 d4 49 89 RSP: 0018:ffffc90004bbf750 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffea0000a20000 RCX: 0000000080040003 RDX: ffff888028800000 RSI: ffffea0000a20000 RDI: ffff888017442140 RBP: 0000000000000000 R08: ffff888028802000 R09: 0000000080040002 R10: dffffc0000000000 R11: ffffed10171e6b02 R12: 0000000080040003 R13: 0000000080040002 R14: ffff888017442140 R15: ffff888028800000 __slab_free+0xa1/0x290 mm/slub.c:3546 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3383 kmem_cache_zalloc include/linux/slab.h:689 [inline] lsm_file_alloc security/security.c:576 [inline] security_file_alloc+0x30/0x110 security/security.c:1544 __alloc_file+0xc2/0x230 fs/file_table.c:143 alloc_empty_file+0x90/0x180 fs/file_table.c:187 path_openat+0x11c/0x2f10 fs/namei.c:3777 do_filp_open+0x1ee/0x420 fs/namei.c:3818 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe043d9d1bc Code: 4c 89 54 24 18 41 89 f2 41 83 e2 40 75 40 89 f0 f7 d0 a9 00 00 41 00 74 35 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 f0 ff ff 77 44 48 8b 54 24 18 64 48 2b 14 25 28 00 00 00 RSP: 002b:00007ffee1d8e810 EFLAGS: 00000206 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fe043e3330a RCX: 00007fe043d9d1bc RDX: 0000000000090800 RSI: 00007ffee1d8f9c0 RDI: 00000000ffffff9c RBP: 00007ffee1d8f9ac R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffee1d8f9c0 R13: 00007fe043e3330a R14: 00000000000aa530 R15: 00007ffee1d8fa00