watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.0.3574:19107] Modules linked in: irq event stamp: 12898439 hardirqs last enabled at (12898438): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (12898439): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (3210876): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (3210876): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (3210876): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (3210879): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (3210879): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (3210879): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 19107 Comm: syz.0.3574 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:lockdep_rht_mutex_is_held+0x0/0x90 lib/rhashtable.c:48 Code: ff e8 f4 ec 23 fd e8 ef 81 92 fc eb e6 cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 53 48 89 fb e8 c2 ec 23 fd 48 c7 c0 a0 32 ef 8f 48 RSP: 0018:ffffc90000007a08 EFLAGS: 00000202 RAX: ffffffff8b0208cc RBX: dffffc0000000000 RCX: 0000000000000100 RDX: ffff888061009e80 RSI: 0000000000000001 RDI: ffff888033bf97c0 RBP: 1ffff1100677f2fa R08: ffff888061009e80 R09: 000000000000000c R10: 000000000000000c R11: 0000000000000100 R12: ffff888033bf97c0 R13: 0000000000000000 R14: 1ffff1100677f2fa R15: 0000000000000001 FS: 00007fe8f3b2d6c0(0000) GS:ffff8881256f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51ca1456b8 CR3: 000000003c332000 CR4: 00000000003526f0 DR0: 8000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 00000000000000d4 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __rhashtable_lookup include/linux/rhashtable.h:646 [inline] rhltable_lookup include/linux/rhashtable.h:731 [inline] sta_info_hash_lookup+0x469/0x610 net/mac80211/sta_info.c:199 sta_info_get_bss+0xfd/0x390 net/mac80211/sta_info.c:236 ieee80211_rx_for_interface+0xdf/0x630 net/mac80211/rx.c:5209 __ieee80211_rx_handle_packet net/mac80211/rx.c:5405 [inline] ieee80211_rx_list+0x266e/0x3050 net/mac80211/rx.c:5544 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5567 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7190 Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 f3 93 fa f5 e8 3e 10 34 f6 fb bf 01 00 00 00 43 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 c4 11 34 f6 bf 01 RSP: 0018:ffffc90002f579f0 EFLAGS: 00000202 RAX: 00000000000005e9 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000007 RSI: ffffffff8dccca32 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8fef0277 R09: 1ffffffff1fde04e R10: dffffc0000000000 R11: fffffbfff1fde04f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__might_sleep+0x76/0xf0 kernel/sched/core.c:8756 Code: ec 03 43 80 3c 3c 00 74 14 49 89 fe 48 89 df 41 89 f5 e8 fd 1d 99 00 4c 89 f7 44 89 ee 48 83 3b 00 75 15 31 d2 48 83 c4 08 5b <41> 5c 41 5d 41 5e 41 5f 5d e9 7c 00 00 00 48 89 3c 24 41 89 f5 4c RSP: 0018:ffffc90002f57b10 EFLAGS: 00000282 RAX: 0000000000000000 RBX: 1ffff920005eaf80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 000000000000024f RDI: ffffffff8bacda20 RBP: 0000000000000000 R08: ffffc90002f57c67 R09: 0000000000000000 R10: ffffc90002f57c40 R11: fffff520005eaf8d R12: ffff88806100b2f8 R13: dffffc0000000000 R14: ffff888061009e98 R15: dffffc0000000000 __mutex_lock_common kernel/locking/mutex.c:591 [inline] __mutex_lock+0x119/0x1300 kernel/locking/mutex.c:776 __do_sys_perf_event_open kernel/events/core.c:13830 [inline] __se_sys_perf_event_open+0x19ad/0x1d60 kernel/events/core.c:13462 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe8f2b9aeb9 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:00007fe8f3b2d028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fe8f2e15fa0 RCX: 00007fe8f2b9aeb9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000440 RBP: 00007fe8f2c08c1f R08: 0000000000000003 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe8f2e16038 R14: 00007fe8f2e15fa0 R15: 00007ffcbb36e2e8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3881 Comm: kworker/u8:14 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x70 kernel/kcov.c:217 Code: 04 24 65 48 8b 0d 88 29 2e 11 65 8b 15 a9 29 2e 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 6c 16 00 00 00 74 2c <8b> 91 48 16 00 00 83 fa 02 75 21 48 8b 91 50 16 00 00 48 8b 32 48 RSP: 0018:ffffc9000cb17698 EFLAGS: 00000246 RAX: ffffffff81b89f1d RBX: 1ffff110170c8575 RCX: ffff888031ef8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000cb177e0 R08: ffffffff8fef0277 R09: 1ffffffff1fde04e R10: dffffc0000000000 R11: fffffbfff1fde04f R12: ffff8880b8642ba8 R13: dffffc0000000000 R14: ffff8880b873bb40 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881257f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d824ea7608 CR3: 000000000e346000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xcfd/0x1270 kernel/smp.c:877 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2921 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1bd/0x250 mm/kfence/core.c:879 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=8e64/1/0x4000000000000000 softirq=87089/87090 fqs=3784 rcu: hardirqs softirqs csw/system rcu: number: 2494631 0 0 rcu: cputime: 41248 11231 29 ==> 52490(ms) rcu: (t=10501 jiffies g=76473 q=8441 ncpus=2) CPU: 0 UID: 0 PID: 19107 Comm: syz.0.3574 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:81 [inline] RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:103 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:238 [inline] RIP: 0010:unwind_next_frame+0x513/0x23c0 arch/x86/kernel/unwind_orc.c:510 Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 RSP: 0018:ffffc90000006c78 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: ffffffff90705a58 RCX: dffffc0000000000 RDX: ffffffff90705a58 RSI: ffffffff912041b2 RDI: ffffffff8c073da0 RBP: ffffffff90705a58 R08: 0000000000000001 R09: ffffffff8e55a3a0 R10: ffffc90000006d98 R11: ffffffff81afb200 R12: ffffffff8b04ea63 R13: ffffffff90705a58 R14: ffffc90000006d48 R15: ffffffff90705a58 FS: 00007fe8f3b2d6c0(0000) GS:ffff8881256f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51ca1456b8 CR3: 000000003c332000 CR4: 00000000003526f0 DR0: 8000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 00000000000000d4 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 kvfree_call_rcu+0x106/0x440 mm/slab_common.c:1994 cfg80211_update_known_bss+0x830/0x1590 net/wireless/scan.c:1944 __cfg80211_bss_update+0x147/0x2110 net/wireless/scan.c:1989 cfg80211_inform_single_bss_data+0xbc4/0x1ab0 net/wireless/scan.c:2369 cfg80211_inform_bss_data+0x23f/0x3c20 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:359 __ieee80211_rx_handle_packet net/mac80211/rx.c:5287 [inline] ieee80211_rx_list+0x2508/0x3050 net/mac80211/rx.c:5544 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5567 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7190 Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 f3 93 fa f5 e8 3e 10 34 f6 fb bf 01 00 00 00 43 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 c4 11 34 f6 bf 01 RSP: 0018:ffffc90002f579f0 EFLAGS: 00000202 RAX: 00000000000005e9 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000007 RSI: ffffffff8dccca32 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8fef0277 R09: 1ffffffff1fde04e R10: dffffc0000000000 R11: fffffbfff1fde04f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__might_sleep+0x76/0xf0 kernel/sched/core.c:8756 Code: ec 03 43 80 3c 3c 00 74 14 49 89 fe 48 89 df 41 89 f5 e8 fd 1d 99 00 4c 89 f7 44 89 ee 48 83 3b 00 75 15 31 d2 48 83 c4 08 5b <41> 5c 41 5d 41 5e 41 5f 5d e9 7c 00 00 00 48 89 3c 24 41 89 f5 4c RSP: 0018:ffffc90002f57b10 EFLAGS: 00000282 RAX: 0000000000000000 RBX: 1ffff920005eaf80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 000000000000024f RDI: ffffffff8bacda20 RBP: 0000000000000000 R08: ffffc90002f57c67 R09: 0000000000000000 R10: ffffc90002f57c40 R11: fffff520005eaf8d R12: ffff88806100b2f8 R13: dffffc0000000000 R14: ffff888061009e98 R15: dffffc0000000000 __mutex_lock_common kernel/locking/mutex.c:591 [inline] __mutex_lock+0x119/0x1300 kernel/locking/mutex.c:776 __do_sys_perf_event_open kernel/events/core.c:13830 [inline] __se_sys_perf_event_open+0x19ad/0x1d60 kernel/events/core.c:13462 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe8f2b9aeb9 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:00007fe8f3b2d028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fe8f2e15fa0 RCX: 00007fe8f2b9aeb9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000440 RBP: 00007fe8f2c08c1f R08: 0000000000000003 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe8f2e16038 R14: 00007fe8f2e15fa0 R15: 00007ffcbb36e2e8