watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.1.1062:10249] Modules linked in: irq event stamp: 6160323 hardirqs last enabled at (6160322): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:200 hardirqs last disabled at (6160323): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (90906): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (90906): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (90906): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (90909): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (90909): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (90909): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 10249 Comm: syz.1.1062 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:lock_acquire+0x180/0x360 kernel/locking/lockdep.c:5872 Code: 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 7b 6f 03 11 48 3b 44 24 58 0f 85 f2 00 00 00 <48> 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 65 8b RSP: 0018:ffffc900000063c0 EFLAGS: 00000246 RAX: 0edf7d76b2a9c500 RBX: 0000000000000000 RCX: 0edf7d76b2a9c500 RDX: 0000000000000000 RSI: ffffffff8dbaa0c3 RDI: ffffffff8be34280 RBP: ffffffff81ef476f R08: 0000000000000000 R09: ffffffff81ef476f R10: dffffc0000000000 R11: ffffffff81ef46e0 R12: 0000000000000002 R13: ffffffff8e13a120 R14: 0000000000000000 R15: 0000000000000246 FS: 00007f096f7ee6c0(0000) GS:ffff888125c12000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f096f7cdd58 CR3: 000000003252a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] __perf_event_output kernel/events/core.c:8480 [inline] perf_event_output_forward+0xb0/0x430 kernel/events/core.c:8503 __perf_event_overflow+0x82d/0xe40 kernel/events/core.c:10379 perf_swevent_overflow kernel/events/core.c:10454 [inline] perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1 perf_tp_event+0x4f6/0x1380 kernel/events/core.c:10999 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:10923 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1169 [inline] unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2422 [inline] slab_free mm/slub.c:4695 [inline] kfree+0x18e/0x440 mm/slub.c:4894 ieee80211_inform_bss+0xbd9/0x10a0 net/mac80211/scan.c:160 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xd05/0x1ac0 net/wireless/scan.c:2380 cfg80211_inform_bss_data+0x1fb/0x3b30 net/wireless/scan.c:3235 cfg80211_inform_bss_frame_data+0x3d7/0x730 net/wireless/scan.c:3326 ieee80211_bss_info_update+0x746/0x9e0 net/mac80211/scan.c:226 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:355 __ieee80211_rx_handle_packet net/mac80211/rx.c:5186 [inline] ieee80211_rx_list+0x201c/0x2a90 net/mac80211/rx.c:5423 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5446 ieee80211_rx include/net/mac80211.h:5210 [inline] ieee80211_handle_queued_frames+0xe8/0x1f0 net/mac80211/main.c:453 tasklet_action_common+0x36c/0x580 kernel/softirq.c:829 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__perf_event_overflow+0x291/0xe40 kernel/events/core.c:10319 Code: 08 e8 f3 01 8b 09 41 89 c6 31 ff 89 c6 e8 a7 f8 cf ff 45 85 f6 74 3b e8 ed a4 b6 ff 84 c0 74 39 e8 54 f4 cf ff e9 80 00 00 00 4a f4 cf ff 49 bc 00 00 00 00 00 fc ff df e9 cd 01 00 00 e8 36 RSP: 0018:ffffc9000c817140 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc900152e9000 RSI: 0000000000003709 RDI: 000000000000370a RBP: ffffc9000c817250 R08: ffff888077cedc2f R09: 1ffff1100ef9db85 R10: dffffc0000000000 R11: ffffed100ef9db86 R12: ffff888077cedce8 R13: 1ffff1100ef9db9d R14: 0000000000000000 R15: ffff888077cedc2c perf_swevent_overflow kernel/events/core.c:10454 [inline] perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1 perf_tp_event+0x4f6/0x1380 kernel/events/core.c:10999 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:10923 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1169 [inline] unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 discard_slab mm/slub.c:2758 [inline] __put_partials+0x156/0x1a0 mm/slub.c:3223 put_cpu_partial+0x17c/0x250 mm/slub.c:3298 __slab_free+0x2d5/0x3c0 mm/slub.c:4565 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4191 [inline] slab_alloc_node mm/slub.c:4240 [inline] kmem_cache_alloc_lru_noprof+0x1c6/0x3d0 mm/slub.c:4259 sock_alloc_inode+0x28/0xc0 net/socket.c:309 alloc_inode+0x6a/0x1b0 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:3392 [inline] sock_alloc net/socket.c:624 [inline] __sock_create+0x12d/0x9f0 net/socket.c:1553 sock_create net/socket.c:1647 [inline] __sys_socket_create net/socket.c:1684 [inline] __sys_socket+0xd7/0x1b0 net/socket.c:1731 __do_sys_socket net/socket.c:1745 [inline] __se_sys_socket net/socket.c:1743 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1743 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f097158ec29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f096f7ee038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f09717d5fa0 RCX: 00007f097158ec29 RDX: 0000000000000106 RSI: 0000000000000003 RDI: 000000000000000a RBP: 00007f0971611e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f09717d6038 R14: 00007f09717d5fa0 R15: 00007ffcc043a908 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3427 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: bat_events batadv_nc_worker RIP: 0010:memset_orig+0x62/0xb0 arch/x86/lib/memset_64.S:85 Code: 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 <83> e1 38 74 14 c1 e9 03 66 0f 1f 44 00 00 ff c9 48 89 07 48 8d 7f RSP: 0018:ffffc90000a08c98 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000014 RCX: 0000000000000004 RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffe8ffffda7cb8 RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000000004 R10: ffffe8ffffda7cb4 R11: fffff91ffffb4f98 R12: ffffffff8dbe2d18 R13: dffffc0000000000 R14: ffffe8ffffda7ca8 R15: ffffffff8dbe2d18 FS: 0000000000000000(0000) GS:ffff888125d12000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb90cf056e8 CR3: 00000000725b2000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_buf_alloc+0x1d5/0x2a0 kernel/trace/trace_event_perf.c:419 do_perf_trace_preemptirq_template include/trace/events/preemptirq.h:14 [inline] perf_trace_preemptirq_template+0x149/0x340 include/trace/events/preemptirq.h:14 __do_trace_irq_disable include/trace/events/preemptirq.h:36 [inline] trace_irq_disable+0xee/0x110 include/trace/events/preemptirq.h:36 tasklet_action_common+0x22f/0x580 kernel/softirq.c:843 handle_softirqs+0x283/0x870 kernel/softirq.c:579 do_softirq+0xec/0x180 kernel/softirq.c:480 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_nc_purge_paths+0x318/0x3b0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x369/0x610 net/batman-adv/network-coding.c:722 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 rescuer_thread+0x53c/0xdd0 kernel/workqueue.c:3496 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245