watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.7.29:4568] Modules linked in: irq event stamp: 10187847 hardirqs last enabled at (10187846): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 hardirqs last disabled at (10187847): [] sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1108 softirqs last enabled at (8353900): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last enabled at (8353900): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last enabled at (8353900): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 softirqs last disabled at (8353903): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (8353903): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last disabled at (8353903): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 CPU: 1 PID: 4568 Comm: syz.7.29 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:sta_info_get_bss+0x2d/0x2a0 net/mac80211/sta_info.c:194 Code: 41 56 41 55 41 54 53 48 89 f3 49 89 fe 49 bd 00 00 00 00 00 fc ff df e8 31 d9 34 f8 4d 8d be 08 06 00 00 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 94 f7 79 f8 4d 8b 3f e8 dc 31 21 RSP: 0018:ffffc90000dd09a8 EFLAGS: 00000a02 RAX: 1ffff1100bc89a51 RBX: ffff888066e0ec5a RCX: ffff88801bc41dc0 RDX: 0000000000000100 RSI: ffff888066e0ec5a RDI: ffff88805e44cc80 RBP: ffffc90000dd0bf0 R08: ffff88801bc41dc0 R09: 0000000000000002 R10: 0000000000000006 R11: 0000000000000100 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff88805e44cc80 R15: ffff88805e44d288 FS: 00007fc2376006c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc2393f5540 CR3: 0000000022c6b000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __ieee80211_rx_handle_packet net/mac80211/rx.c:4865 [inline] ieee80211_rx_list+0x1b0b/0x25e0 net/mac80211/rx.c:4995 ieee80211_rx_napi+0x17f/0x390 net/mac80211/rx.c:5018 ieee80211_rx include/net/mac80211.h:4573 [inline] ieee80211_handle_queued_frames+0x104/0x1a0 net/mac80211/main.c:237 tasklet_action_common+0x2ad/0x410 kernel/softirq.c:806 handle_softirqs+0x336/0x830 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:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6799 Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 75 e5 8a f7 e8 20 b7 b7 f7 fb bf 01 00 00 00 d5 b5 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f RSP: 0018:ffffc9000119fa20 EFLAGS: 00000282 RAX: 9c46657d82393900 RBX: 0000000000000000 RCX: 9c46657d82393900 RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001 RBP: ffffc9000119fac0 R08: ffff8880b913b30b R09: 1ffff11017227661 R10: dffffc0000000000 R11: ffffed1017227662 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000233f44 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:lock_release+0x5a4/0x8a0 kernel/locking/lockdep.c:5647 Code: 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 2c 04 f8 75 6f 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 2c 00 00 00 00 43 c7 44 2c 08 00 00 00 00 65 48 8b 04 25 RSP: 0018:ffffc9000119fb80 EFLAGS: 00000206 RAX: 0000000000000001 RBX: ffffffffffffffff RCX: 9c46657d82393900 RDX: 0000000000000000 RSI: ffffffff8a2b3e80 RDI: ffffffff8a7a2a40 RBP: ffffc9000119fc90 R08: ffffffff8d8aeaef R09: 1ffffffff1b15d5d R10: dffffc0000000000 R11: fffffbfff1b15d5e R12: 1ffff92000233f7c R13: dffffc0000000000 R14: ffff88801bc428a0 R15: 0000000000000246 __mutex_unlock_slowpath+0xc8/0x6c0 kernel/locking/mutex.c:851 __do_sys_perf_event_open kernel/events/core.c:12807 [inline] __se_sys_perf_event_open+0x19df/0x1bb0 kernel/events/core.c:12387 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: 0033:0x7fc2393a7e59 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:00007fc237600028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fc23962ffa0 RCX: 00007fc2393a7e59 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000012c0 RBP: 00007fc23943de6f R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc239630038 R14: 00007fc23962ffa0 R15: 00007ffc610eb8d8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4577 Comm: kworker/u4:9 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: bat_events batadv_tt_purge RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xc/0x60 kernel/kcov.c:206 Code: 89 fb e8 17 00 00 00 48 8b 3d 80 fa 11 0c 48 89 de 5b e9 07 56 44 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d 14 7d 89 7e <65> 8b 15 15 7d 89 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 RSP: 0018:ffffc90000007e98 EFLAGS: 00000082 RAX: ffffffff817f1a27 RBX: 0000000000000000 RCX: ffff88802b830000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880b903b308 RBP: 0000000000000001 R08: ffff8880b903b30b R09: 1ffff11017207661 R10: dffffc0000000000 R11: ffffed1017207662 R12: 0000000000000000 R13: ffffffff8c00a0f8 R14: ffffffff81492b7f R15: ffff88802c5fc410 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feec1cd2765 CR3: 000000007d95f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_irq_enable_rcuidle+0xd7/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 handle_softirqs+0x19f/0x830 kernel/softirq.c:560 do_softirq+0x142/0x210 kernel/softirq.c:477 __local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:401 spin_unlock_bh include/linux/spinlock.h:409 [inline] batadv_tt_global_purge net/batman-adv/translation-table.c:2359 [inline] batadv_tt_purge+0x4b1/0xa10 net/batman-adv/translation-table.c:3633 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287