rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2645 jiffies s: 37477 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: 10715 Comm: syz.3.1847 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:perf_trace_buf_alloc+0x1c3/0x300 kernel/trace/trace_event_perf.c:423 Code: 34 f5 80 39 65 8c 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 bb f3 48 00 4c 89 f8 49 03 06 48 63 cb 48 8d 5c 01 f8 <4c> 8d 74 01 ff 48 89 d9 48 c1 e9 03 42 0f b6 0c 29 84 c9 0f 85 9f RSP: 0018:ffffc900000078a0 EFLAGS: 00000086 RAX: ffffe8ffffcce000 RBX: ffffe8ffffcce00c RCX: 0000000000000014 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000000 R08: ffffffff8e1ff3ef R09: 1ffffffff1c3fe7d R10: dffffc0000000000 R11: fffffbfff1c3fe7e R12: ffffffff8c653980 R13: dffffc0000000000 R14: ffffffff8c653980 R15: 0000607f46ece000 FS: 00007f81a1c856c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f62851456b8 CR3: 00000000405ff000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_preemptirq_template+0x143/0x320 include/trace/events/preemptirq.h:14 trace_irq_disable include/trace/events/preemptirq.h:36 [inline] trace_hardirqs_off_finish+0x13f/0x180 kernel/trace/trace_preemptirq.c:67 irqentry_enter+0x33/0x50 kernel/entry/common.c:382 sysvec_irq_work+0xa/0xc0 arch/x86/kernel/irq_work.c:17 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 d2 33 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:ffffc90000007ac0 EFLAGS: 00000206 RAX: 7a9550d812acd000 RBX: 1ffff92000000f60 RCX: 7a9550d812acd000 RDX: dffffc0000000000 RSI: ffffffff8a8c1120 RDI: ffffffff8adf1320 RBP: ffffc90000007bb0 R08: ffffffff90af9347 R09: 1ffffffff215f268 R10: dffffc0000000000 R11: fffffbfff215f269 R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8e3b900 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147 __run_hrtimer kernel/time/hrtimer.c:1747 [inline] __hrtimer_run_queues+0x54a/0xd50 kernel/time/hrtimer.c:1811 hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828 handle_softirqs+0x2a1/0x930 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:__orc_find arch/x86/kernel/unwind_orc.c:49 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:178 [inline] RIP: 0010:unwind_next_frame+0x1380/0x20b0 arch/x86/kernel/unwind_orc.c:448 Code: 0f b6 04 08 84 c0 75 27 49 63 06 4c 01 f0 49 8d 4e 04 48 39 e8 4c 0f 46 e9 49 8d 46 fc 4c 0f 47 e0 4d 0f 46 fe 4d 39 e5 76 a8 d6 ee ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 7c cc 4c 89 f7 48 RSP: 0018:ffffc90003026f50 EFLAGS: 00000212 RAX: ffffffff8e379c28 RBX: ffffc90003027028 RCX: ffffffff8e379c30 RDX: ffffffff8eab50e6 RSI: ffffffff8e379c2c RDI: ffffffff81391adf RBP: ffffffff81e2034b R08: 0000000000000001 R09: 000000000000000a R10: dffffc0000000000 R11: fffff52000604e11 R12: ffffffff8e379c2c R13: ffffffff8e379c30 R14: ffffffff8e379c2c R15: ffffffff8e379c2c arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 kvfree_call_rcu+0x103/0x870 kernel/rcu/tree.c:3405 sctp_bind_addr_clean net/sctp/bind_addr.c:131 [inline] sctp_bind_addr_free+0x130/0x170 net/sctp/bind_addr.c:140 sctp_association_free+0x2b2/0x7e0 net/sctp/associola.c:359 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1331 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x3725/0x55f0 net/sctp/sm_sideeffect.c:1170 sctp_primitive_SHUTDOWN+0x94/0xc0 net/sctp/primitive.c:89 sctp_close+0x404/0x910 net/sctp/socket.c:1527 inet_release+0x139/0x180 net/ipv4/af_inet.c:430 __sock_release net/socket.c:654 [inline] sock_close+0xd5/0x240 net/socket.c:1399 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 get_signal+0x11a6/0x1350 kernel/signal.c:2648 arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f81a0d9cdd9 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:00007f81a1c85028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 0000000000000001 RBX: 00007f81a1015fa0 RCX: 00007f81a0d9cdd9 RDX: 0000000000000040 RSI: 00002000000007c0 RDI: 0000000000000009 RBP: 00007f81a0e32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f81a1016038 R14: 00007f81a1015fa0 R15: 00007fff15d5d848