syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.7.18450:29971]
Modules linked in:
irq event stamp: 13340085
hardirqs last  enabled at (13340084): [<ffffffff8b494f9d>] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219
hardirqs last disabled at (13340085): [<ffffffff8b49380e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (8731974): [<ffffffff8185372a>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (8731974): [<ffffffff8185372a>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (8731974): [<ffffffff8185372a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
softirqs last disabled at (8731977): [<ffffffff8185372a>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (8731977): [<ffffffff8185372a>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (8731977): [<ffffffff8185372a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
CPU: 1 UID: 0 PID: 29971 Comm: syz.7.18450 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lock_release+0x33b/0x3b0 kernel/locking/lockdep.c:-1
Code: 48 8d 3d b8 43 e5 0d 67 48 0f b9 3a e9 1f fe ff ff e8 d9 e2 aa 09 48 c7 c7 90 1e e1 8d 4c 89 ee e8 ca f7 24 03 e9 c8 fd ff ff <f3> 0f 1e fa 4d 89 f7 4c 89 eb 65 8b 05 68 92 d8 10 83 f8 08 73 55
RSP: 0018:ffffc90000a08410 EFLAGS: 00000282
RAX: 8f5ab009c72e7b00 RBX: ffffffff90173d01 RCX: 8f5ab009c72e7b00
RDX: ffffc90000a08501 RSI: ffffffff8173ef25 RDI: ffffffff8df41cc0
RBP: dffffc0000000000 R08: ffffc90000a08680 R09: 0000000000000000
R10: ffffc90000a08598 R11: fffff520001410b5 R12: ffffc90000a08690
R13: ffffffff8173ef25 R14: ffffffff8df41cc0 R15: ffffffff8173ef25
FS:  00007f96aaf8b6c0(0000) GS:ffff8881261b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005630e9c06f30 CR3: 0000000056694000 CR4: 00000000003526f0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:897 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1195 [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:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6663 [inline]
 kmem_cache_free+0x197/0x620 mm/slub.c:6774
 tcp_write_queue_purge+0x143/0x300 net/ipv4/tcp.c:3340
 tcp_done_with_error+0x43/0xd0 net/ipv4/tcp_input.c:4640
 tcp_write_err net/ipv4/tcp_timer.c:77 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:294 [inline]
 tcp_retransmit_timer+0x1d23/0x3380 net/ipv4/tcp_timer.c:600
 tcp_write_timer+0x15c/0x2d0 net/ipv4/tcp_timer.c:736
 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2373 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404
 handle_softirqs+0x27d/0x850 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7190
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 cb 4d 46 f6 e8 b6 93 7e f6 fb bf 01 00 00 00 <e8> 1b a8 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000c577640 EFLAGS: 00000286
RAX: 8f5ab009c72e7b00 RBX: ffff888083cd1e80 RCX: 8f5ab009c72e7b00
RDX: 0000000000000007 RSI: ffffffff8d76bd39 RDI: 0000000000000001
RBP: ffffc9000c5776f0 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e
R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920018aeec8
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:mt_locked lib/maple_tree.c:729 [inline]
RIP: 0010:mt_slot lib/maple_tree.c:736 [inline]
RIP: 0010:mas_next_slot+0x947/0xcf0 lib/maple_tree.c:4406
Code: e7 7f f6 41 81 ff 00 03 00 00 75 36 48 89 d8 48 c1 e8 03 42 80 3c 20 00 4c 8b 7c 24 40 74 08 48 89 df e8 7c c7 e5 f6 48 8b 1b <48> 85 db 74 63 e8 5f e3 7f f6 eb 1a e8 58 e3 7f f6 4c 8b 7c 24 40
RSP: 0018:ffffc9000c577800 EFLAGS: 00000246
RAX: 1ffff1100c252008 RBX: ffff888061290340 RCX: 0000000000000000
RDX: ffff888083cd1e80 RSI: 0000000000000300 RDI: 0000000000000300
RBP: 0000000000000001 R08: ffff888083cd1e80 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888032f76600 R14: ffff888075179000 R15: ffffffffffffffff
 mas_find+0xb0e/0xd30 lib/maple_tree.c:5622
 vma_next include/linux/mm.h:931 [inline]
 acct_collect+0x1d9/0x760 kernel/acct.c:571
 do_exit+0x5cb/0x2310 kernel/exit.c:937
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1114
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96aa18f749
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:00007f96aaf8b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f96aa3e6098 RCX: 00007f96aa18f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f96aa3e6098
RBP: 00007f96aa3e6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f96aa3e6128 R14: 00007ffc842e5b00 R15: 00007ffc842e5be8
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 29977 Comm: syz.1.18451 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:647 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:1229 [inline]
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0x4e/0x340 kernel/locking/lockdep.c:5831
Code: 48 8b ac 24 98 00 00 00 65 48 8b 05 4c c6 d8 10 48 89 44 24 58 e9 23 02 00 00 65 8b 05 4f c6 d8 10 83 f8 08 0f 83 af 01 00 00 <89> c0 48 0f a3 05 78 30 e2 0d 73 0d e8 11 1b 09 00 84 c0 0f 84 d7
RSP: 0018:ffffc90000006858 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffe8ffffc661f8
RDX: 0000000000000000 RSI: ffffffff8bbfc640 RDI: ffffffff8bbfc600
RBP: ffffffff8173ef25 R08: 0000000000000002 R09: 0000000000000000
R10: ffffc90000006a28 R11: fffff52000000d51 R12: 0000000000000002
R13: ffffffff8df41cc0 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fecd06b26c0(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555717717d0 CR3: 000000008911e000 CR4: 00000000003526f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5652 [inline]
 __kmalloc_noprof+0x411/0x800 mm/slub.c:5664
 kmalloc_noprof include/linux/slab.h:961 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 ieee802_11_parse_elems_full+0x152/0x2ab0 net/mac80211/parse.c:1031
 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2469 [inline]
 ieee80211_inform_bss+0x147/0x1130 net/mac80211/scan.c:79
 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
 cfg80211_inform_single_bss_data+0xd14/0x1ad0 net/wireless/scan.c:2373
 cfg80211_inform_bss_data+0x203/0x3b40 net/wireless/scan.c:3228
 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319
 ieee80211_bss_info_update+0x749/0x9e0 net/mac80211/scan.c:230
 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:359
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5282 [inline]
 ieee80211_rx_list+0x2485/0x2f90 net/mac80211/rx.c:5539
 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5562
 ieee80211_rx include/net/mac80211.h:5216 [inline]
 ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452
 tasklet_action_common+0x358/0x550 kernel/softirq.c:925
 handle_softirqs+0x27d/0x850 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:schedule_debug kernel/sched/core.c:5815 [inline]
RIP: 0010:__schedule+0x19b/0x5000 kernel/sched/core.c:6740
Code: f6 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 6c 11 dd f6 48 81 3b 9d 6e ac 57 <0f> 85 5b 19 00 00 45 85 ed 7f 54 49 8d 5e 18 48 89 d8 48 c1 e8 03
RSP: 0018:ffffc90003c6f380 EFLAGS: 00000246
RAX: 1ffff9200078d000 RBX: ffffc90003c68000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8bbfc640 RDI: ffffffff8bbfc600
RBP: ffffc90003c6f590 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e
R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: ffff8881260b1000
R13: 0000000000000001 R14: ffff888024da8000 R15: 1ffff11017107658
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_schedule+0x4/0xc0 kernel/sched/core.c:7064
Code: 51 46 f6 c3 cc cc cc cc cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 48 89 e5 41 56 53 48 83 e4 e0 48 83 ec 60 65 48 8b 05 35 80 2c
RSP: 0018:ffffc90003c6f750 EFLAGS: 00000283
RAX: ffffffff81b5c165 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001caec000 RSI: 0000000000004fa6 RDI: 0000000000004fa7
RBP: ffffc90003c6f7a0 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e
R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: 0000000000000000
R13: ffffc90003c6f870 R14: 0000000000000000 R15: ffffffff81683e80
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 on_each_cpu_cond_mask+0x7a/0x80 kernel/smp.c:1044
 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+0xb44/0x1130 arch/x86/kernel/alternative.c:2983
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 tracepoint_add_func+0x994/0xa10 kernel/tracepoint.c:315
 tracepoint_probe_register_prio kernel/tracepoint.c:464 [inline]
 tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:484
 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
 perf_trace_event_init+0x4e1/0x9d0 kernel/trace/trace_event_perf.c:202
 perf_trace_init+0x23d/0x2d0 kernel/trace/trace_event_perf.c:226
 perf_tp_event_init+0x8d/0x120 kernel/events/core.c:10943
 perf_try_init_event+0x17f/0x870 kernel/events/core.c:12686
 perf_init_event kernel/events/core.c:12784 [inline]
 perf_event_alloc+0x1430/0x2d50 kernel/events/core.c:13059
 __do_sys_perf_event_open kernel/events/core.c:13577 [inline]
 __se_sys_perf_event_open+0x756/0x1d90 kernel/events/core.c:13458
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feccf78f749
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:00007fecd06b2038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007feccf9e5fa0 RCX: 00007feccf78f749
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000200000000040
RBP: 00007feccf813f91 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007feccf9e6038 R14: 00007feccf9e5fa0 R15: 00007fffe7e96b68
 </TASK>