rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=aa3/1/0x4000000000000000 softirq=8580/8585 fqs=5141 (detected by 1, t=10502 jiffies, g=10337, q=1984) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5017 Comm: syz.1.223 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x7e/0x80 kernel/kcov.c:295 Code: 8d 50 28 4d 39 ca 77 22 89 ff 89 f6 4a c7 44 02 08 05 00 00 00 4a 89 7c 02 10 4a 89 74 02 18 4a 89 44 02 20 48 ff c1 48 89 0a 90 48 8b 04 24 65 48 8b 0d c4 4a 89 7e 65 8b 15 c5 4a 89 7e 81 RSP: 0018:ffffc900000078c8 EFLAGS: 00000046 RAX: ffffffff81987391 RBX: 0000000000000001 RCX: ffff888026693b80 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff8880b903b30b R09: 1ffff11017207661 R10: dffffc0000000000 R11: ffffed1017207662 R12: 1ffff11017206a21 R13: dffffc0000000000 R14: ffff8880b9035108 R15: dffffc0000000000 FS: 00007ffbfac826c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffbfa81f000 CR3: 000000005b70a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: get_recursion_context kernel/events/internal.h:216 [inline] perf_swevent_get_recursion_context+0xd1/0x150 kernel/events/core.c:9744 perf_trace_buf_alloc+0x54/0x300 kernel/trace/trace_event_perf.c:414 perf_trace_preemptirq_template+0x180/0x360 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 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 12 f2 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc90000007b00 EFLAGS: 00000206 RAX: dd7d5219905be100 RBX: 1ffff92000000f64 RCX: dd7d5219905be100 RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f980 RBP: ffffc90000007bd8 R08: ffffffff901d418f R09: 1ffffffff203a831 R10: dffffc0000000000 R11: fffffbfff203a832 R12: ffffffff8c322f00 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] ieee80211_iterate_active_interfaces_atomic+0x132/0x140 net/mac80211/util.c:831 mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4f2/0xb70 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766 handle_softirqs+0x339/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:67 Code: 8c c6 fc ff ff 4c 89 e7 e8 3a fa 88 00 48 ba 00 00 00 00 00 fc ff df e9 af fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 48 8b 07 00 00 cc cc 00 00 cc cc 00 00 cc cc 31 c0 81 ff 03 00 00 40 0f RSP: 0018:ffffc90002e8f2c0 EFLAGS: 00000202 RAX: ffffffff89bc315c RBX: ffffc90002e8f388 RCX: 1ffff920005d1e01 RDX: 1ffffffff1cf01b9 RSI: ffffffff8e780dca RDI: ffffc90002e8ff18 RBP: ffffc90002e8f3d0 R08: 0000000000000001 R09: 0000000000000007 R10: dffffc0000000000 R11: fffff520005d1e7d R12: 1ffffffff1cf01b9 R13: ffffc90002e90000 R14: ffffc90002e88000 R15: ffffc90002e8ff18 deref_stack_reg arch/x86/kernel/unwind_orc.c:360 [inline] unwind_next_frame+0x9c4/0x1d90 arch/x86/kernel/unwind_orc.c:539 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] 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+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] sctp_transport_new+0x7c/0x5b0 net/sctp/transport.c:97 sctp_assoc_add_peer+0x252/0x15a0 net/sctp/associola.c:619 sctp_connect_new_asoc+0x31f/0x6a0 net/sctp/socket.c:1097 sctp_sendmsg_new_asoc net/sctp/socket.c:1689 [inline] sctp_sendmsg+0x158d/0x2900 net/sctp/socket.c:2003 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499 __sys_sendmsg net/socket.c:2528 [inline] __do_sys_sendmsg net/socket.c:2537 [inline] __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7ffbfca28819 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:00007ffbfac82028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffbfcca1fa0 RCX: 00007ffbfca28819 RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000008 RBP: 00007ffbfcabec91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffbfcca2038 R14: 00007ffbfcca1fa0 R15: 00007ffc9c6896f8