rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2685 jiffies s: 86049 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 20654 Comm: syz.0.4962 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__sanitizer_cov_trace_cmp4+0x7e/0x80 kernel/kcov.c:284 Code: 8d 52 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 04 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 90 48 8b 04 24 65 48 8b 0d 74 3a 80 7e 65 8b 15 75 3a 80 7e 81 RSP: 0018:ffffc900000077a0 EFLAGS: 00000046 RAX: ffffffff818e8c4a RBX: ffff8880b8e3bbb0 RCX: 0000000000000100 RDX: ffff8880250f9e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff8e20b46f R09: 1ffffffff1c4168d R10: dffffc0000000000 R11: fffffbfff1c4168e R12: 0000000000000000 R13: dffffc0000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00007efc663a86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a185d9ff8 CR3: 0000000057a81000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: irq_work_queue_on+0x12a/0x260 kernel/irq_work.c:143 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:10037 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 32 7b 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:ffffc90000007c40 EFLAGS: 00000206 RAX: 4335020c48bb4300 RBX: 1ffff92000000f90 RCX: 4335020c48bb4300 RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf68a0 RBP: ffffc90000007d30 R08: ffff8880b8e357cb R09: 1ffff110171c6af9 R10: dffffc0000000000 R11: ffffed10171c6afa R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8e3bb00 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] rebalance_domains+0x86f/0x9d0 kernel/sched/fair.c:11052 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:finish_task_switch+0x267/0x8e0 kernel/sched/core.c:5125 Code: d9 08 85 c0 0f 84 38 01 00 00 48 85 db 0f 85 57 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 93 20 e3 08 e8 1e 18 2f 00 fb 4c 8b 65 b8 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc9000359ec60 EFLAGS: 00000286 RAX: 4335020c48bb4300 RBX: 0000000000000000 RCX: 4335020c48bb4300 RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf68a0 RBP: ffffc9000359ecb0 R08: ffff8880b8e357cb R09: 1ffff110171c6af9 R10: dffffc0000000000 R11: ffffed10171c6afa R12: ffff8880250f9e00 R13: 1ffff110171c76f2 R14: dffffc0000000000 R15: ffff8880b8e3b790 context_switch kernel/sched/core.c:5249 [inline] __schedule+0x1087/0x4030 kernel/sched/core.c:6563 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6875 irqentry_exit+0x63/0x70 kernel/entry/common.c:442 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:qlink_free mm/kasan/quarantine.c:168 [inline] RIP: 0010:qlist_free_all+0x64/0xe0 mm/kasan/quarantine.c:187 Code: 49 89 c4 49 8b 2f 49 63 84 24 c0 00 00 00 49 29 c7 4c 89 e7 4c 89 fe e8 8a ec ff ff 66 90 4c 89 f8 48 c1 e8 03 42 c6 04 28 fb <48> 8d 15 00 00 00 00 4c 89 e7 4c 89 fe e8 2a 26 ff ff 48 85 ed 75 RSP: 0018:ffffc9000359efc0 EFLAGS: 00000a02 RAX: 1ffff1100c1b1f80 RBX: ffffc9000359f000 RCX: 0000000000000000 RDX: ffff888060d8fc00 RSI: ffff888060d8fc00 RDI: ffff888017441a00 RBP: ffff888146fc0180 R08: ffff888146fc0340 R09: 000000008040003e R10: dffffc0000000000 R11: ffffed10171c6afa R12: ffff888017441a00 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888060d8fc00 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] __kmem_cache_alloc_node+0x19d/0x270 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] is_state_visited kernel/bpf/verifier.c:12351 [inline] do_check kernel/bpf/verifier.c:12480 [inline] do_check_common+0x3499/0xc560 kernel/bpf/verifier.c:14962 do_check_main kernel/bpf/verifier.c:15025 [inline] bpf_check+0x3eb5/0x11010 kernel/bpf/verifier.c:15614 bpf_prog_load+0x100e/0x1530 kernel/bpf/syscall.c:2651 __sys_bpf+0x5b8/0x780 kernel/bpf/syscall.c:5032 __do_sys_bpf kernel/bpf/syscall.c:5136 [inline] __se_sys_bpf kernel/bpf/syscall.c:5134 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5134 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: 0033:0x7efc6559e159 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:00007efc663a8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007efc65825fa0 RCX: 00007efc6559e159 RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005 RBP: 00007efc6563506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc65826038 R14: 00007efc65825fa0 R15: 00007ffd1d1c9308