watchdog: BUG: soft lockup - CPU#1 stuck for 135s! [syz.4.1040:10143] Modules linked in: irq event stamp: 13869047 hardirqs last enabled at (13869046): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (13869047): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (91572): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (91572): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (91572): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (91575): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (91575): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (91575): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 10143 Comm: syz.4.1040 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 51 d3 d8 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 3b 24 30 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 08 f2 32 RSP: 0018:ffffc90000a07c78 EFLAGS: 00000286 RAX: c3c8afc7ffd0e600 RBX: 0000000000000000 RCX: 0000000000000303 RDX: 00000000319e51bd RSI: ffffffff8dd3b0c7 RDI: ffffffff8be73880 RBP: ffffffff8174c0e5 R08: ffffffff8174c0e5 R09: ffffffff8e35a320 R10: ffffc90000a07dd8 R11: ffffffff81ae4560 R12: 0000000000000002 R13: ffffffff8e35a320 R14: 0000000000000000 R15: 0000000000000246 FS: 00007f16867f66c0(0000) GS:ffff888125a2c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000004 CR3: 000000007d004000 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:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 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+0x233/0x3bb0 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:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x5a/0xb0 kernel/rcu/tree.c:751 Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 fc 39 81 00 48 c7 c3 d8 76 d0 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 34 8b 03 65 ff 0d 99 00 27 11 74 11 83 e0 04 c1 e8 02 5b RSP: 0018:ffffc9000bf57988 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: ffff8880b87336d8 RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8be73860 RDI: ffffffff8be73820 RBP: ffffc9000bf57bc0 R08: ffffffff8fceca77 R09: 1ffffffff1f9d94e R10: dffffc0000000000 R11: fffffbfff1f9d94f R12: dffffc0000000000 R13: ffff888029810000 R14: ffffffff8dd7edd8 R15: dffffc0000000000 trace_sched_exit_tp+0x36/0xf0 include/trace/events/sched.h:886 __schedule+0x1505/0x4fb0 kernel/sched/core.c:6873 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190 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:perf_unpin_context+0x0/0x70 kernel/events/core.c:1540 Code: c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 09 67 87 09 cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <41> 56 53 48 89 fb e8 85 17 cf ff 48 89 df e8 fd 1b 87 09 48 8d 8b RSP: 0018:ffffc9000bf57cf8 EFLAGS: 00000246 RAX: c3c8afc7ffd0e600 RBX: ffff88805b2a3d00 RCX: 0000000000080000 RDX: ffffc9000d87d000 RSI: 00000000000017c9 RDI: ffff88805a6cd000 RBP: ffffc9000bf57ee0 R08: ffffffff8fceca77 R09: 1ffffffff1f9d94e R10: dffffc0000000000 R11: fffffbfff1f9d94f R12: 1ffff920017eafb0 R13: ffff888034809920 R14: ffff888034809b68 R15: ffff88805a6cd000 __do_sys_perf_event_open kernel/events/core.c:13821 [inline] __se_sys_perf_event_open+0x1937/0x1d60 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: 0033:0x7f168859acb9 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:00007f16867f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f1688815fa0 RCX: 00007f168859acb9 RDX: affffff7ffffffff RSI: 0000000000000000 RDI: 0000200000000180 RBP: 00007f1688608bf7 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1688816038 R14: 00007f1688815fa0 R15: 00007ffc5e85a378 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 10098 Comm: syz.6.1028 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:its_return_thunk+0x0/0x10 arch/x86/lib/retpoline.S:417 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 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 e9 9b 7f b8 f5 cc RSP: 0018:ffffc90000007b78 EFLAGS: 00000046 RAX: ffffffff81ce1bad RBX: 0000000000000001 RCX: 0000000000000100 RDX: ffff888031c01e80 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000007c98 R08: ffffffff81ce1ad2 R09: ffffffff8e35a320 R10: ffffe8ffffcc500c R11: fffff91ffff98a03 R12: ffff8880319f3c80 R13: dffffc0000000000 R14: 1ffff92000000f80 R15: ffffffff8e3c6fc8 FS: 00007fe2bd0776c0(0000) GS:ffff88812592c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f31f2cbc0f4 CR3: 0000000078236000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_call_bpf+0x19d/0xb70 kernel/trace/bpf_trace.c:145 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11000 do_perf_trace_preemptirq_template include/trace/events/preemptirq.h:14 [inline] perf_trace_preemptirq_template+0x268/0x340 include/trace/events/preemptirq.h:14 __do_trace_irq_disable include/trace/events/preemptirq.h:36 [inline] trace_irq_disable+0xd4/0x100 include/trace/events/preemptirq.h:36 irqentry_enter+0xac/0x130 kernel/entry/common.c:145 sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:tasklet_action_common+0x85/0x4b0 kernel/softirq.c:915 Code: b8 00 00 00 00 00 fc ff df 48 89 4c 24 28 80 3c 01 00 74 08 4c 89 ff e8 19 40 a3 00 4d 89 64 24 08 e8 af 18 44 00 fb 48 85 ed <49> bc 00 00 00 00 00 fc ff df 0f 84 fb 03 00 00 b8 01 00 00 00 44 RSP: 0018:ffffc90000007ed8 EFLAGS: 00000286 RAX: 0000000000f18620 RBX: 1ffffffff1c0181e RCX: 0000000080000101 RDX: 0000000000000003 RSI: ffffffff8dad24d5 RDI: ffffffff8be73880 RBP: ffff88807bea9650 R08: ffffffff8fceca77 R09: 1ffffffff1f9d94e R10: dffffc0000000000 R11: fffffbfff1f9d94f R12: ffff8880b8624240 R13: 0000000000000006 R14: 0000000000000007 R15: ffff8880b8624248 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:finish_task_switch+0x241/0x920 kernel/sched/core.c:5114 Code: 0f 84 bd 01 00 00 48 85 db 0f 85 e4 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 99 b8 e7 09 e8 64 84 37 00 fb 4c 8b 65 c0 <49> 8d bc 24 48 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc9000bcd6e18 EFLAGS: 00000202 RAX: 0000000000f1810d RBX: 0000000000000000 RCX: 0000000080000001 RDX: 0000000000000007 RSI: ffffffff8dad24d5 RDI: ffffffff8be73880 RBP: ffffc9000bcd6e70 R08: ffffffff8fceca77 R09: 1ffffffff1f9d94e R10: dffffc0000000000 R11: fffffbfff1f9d94f R12: ffff888031c01e80 R13: dffffc0000000000 R14: ffff88801ce95b80 R15: ffff8880b863b498 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14f7/0x4fb0 kernel/sched/core.c:6863 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190 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:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 51 d3 d8 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 3b 24 30 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 08 f2 32 RSP: 0018:ffffc9000bcd71b8 EFLAGS: 00000286 RAX: 07c4892ab6d58e00 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 00000000e7b48f9d RSI: ffffffff8dd3b0c7 RDI: ffffffff8be73880 RBP: ffffffff8174c0e5 R08: ffffffff8174c0e5 R09: ffffffff8e35a320 R10: ffffc9000bcd7318 R11: ffffffff81ae4560 R12: 0000000000000002 R13: ffffffff8e35a320 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xbb0/0xd10 mm/page_alloc.c:2943 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 __slab_free+0x294/0x320 mm/slub.c:5952 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x370/0x6e0 mm/slub.c:5270 vm_area_dup+0x2b/0x680 mm/vma_init.c:123 dup_mmap+0x896/0x1bb0 mm/mmap.c:1773 dup_mm kernel/fork.c:1529 [inline] copy_mm+0x13b/0x4b0 kernel/fork.c:1581 copy_process+0x166e/0x3980 kernel/fork.c:2221 kernel_clone+0x248/0x870 kernel/fork.c:2651 __do_sys_clone kernel/fork.c:2792 [inline] __se_sys_clone kernel/fork.c:2776 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2776 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: 0033:0x7fe2bc19acb9 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:00007fe2bd076fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fe2bc415fa0 RCX: 00007fe2bc19acb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fe2bc208bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe2bc416038 R14: 00007fe2bc415fa0 R15: 00007ffc727f05b8