syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 139s! [syz.2.169:6544]
Modules linked in:
irq event stamp: 11404687
hardirqs last  enabled at (11404686): [<ffffffff8b472c44>] irqentry_exit+0x74/0x90 kernel/entry/common.c:214
hardirqs last disabled at (11404687): [<ffffffff8b47187e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052
softirqs last  enabled at (607758): [<ffffffff8183ee9a>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (607758): [<ffffffff8183ee9a>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (607758): [<ffffffff8183ee9a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
softirqs last disabled at (607761): [<ffffffff8183ee9a>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (607761): [<ffffffff8183ee9a>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (607761): [<ffffffff8183ee9a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
CPU: 0 UID: 0 PID: 6544 Comm: syz.2.169 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 1b 24 7d f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 53 5c 45 f6 65 8b 05 bc d8 45 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90000007760 EFLAGS: 00000206
RAX: 62e6e5de16c76b00 RBX: 0000000000000a02 RCX: 62e6e5de16c76b00
RDX: 0000000000000002 RSI: ffffffff8d7e3703 RDI: 0000000000000001
RBP: ffffc900000077f8 R08: ffffffff8f9db437 R09: 1ffffffff1f3b686
R10: dffffc0000000000 R11: fffffbfff1f3b687 R12: dffffc0000000000
R13: ffff88806d810000 R14: ffffffff99bfb860 R15: 1ffff92000000eec
FS:  00007f45b97746c0(0000) GS:ffff888125d27000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f157e3b12f8 CR3: 0000000061f82000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
 debug_check_no_obj_freed+0x451/0x470 lib/debugobjects.c:1129
 free_pages_prepare mm/page_alloc.c:1401 [inline]
 __free_frozen_pages+0x4dd/0xd30 mm/page_alloc.c:2906
 __folio_put+0x21b/0x2c0 mm/swap.c:112
 put_netmem net/core/skbuff.c:7375 [inline]
 skb_page_unref include/linux/skbuff_ref.h:43 [inline]
 __skb_frag_unref include/linux/skbuff_ref.h:56 [inline]
 skb_release_data+0x49a/0x7c0 net/core/skbuff.c:1081
 skb_release_all net/core/skbuff.c:1152 [inline]
 __kfree_skb+0x55/0x70 net/core/skbuff.c:1166
 tcp_write_queue_purge+0x143/0x300 net/ipv4/tcp.c:3336
 tcp_done_with_error+0x43/0xd0 net/ipv4/tcp_input.c:4617
 tcp_write_err net/ipv4/tcp_timer.c:77 [inline]
 tcp_probe_timer net/ipv4/tcp_timer.c:431 [inline]
 tcp_write_timer_handler+0x6ec/0x9b0 net/ipv4/tcp_timer.c:721
 tcp_write_timer+0x162/0x2e0 net/ipv4/tcp_timer.c:738
 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x283/0x870 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:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_read_lock_held_common kernel/rcu/update.c:346 [inline]
RIP: 0010:rcu_read_lock_held+0x4/0x50 kernel/rcu/update.c:349
Code: 0d e9 d0 c4 a5 09 cc 66 66 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 <53> e8 06 e9 a2 09 85 c0 74 26 31 db e8 eb 2d 01 00 84 c0 74 20 e8
RSP: 0018:ffffc9000bbaedf8 EFLAGS: 00000202
RAX: ffffffff81ca8a55 RBX: 0000000000000001 RCX: 0000000000000002
RDX: ffff8880630f5ac0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000bbaef18 R08: 0000000000000000 R09: ffffffff81ca8977
R10: dffffc0000000000 R11: fffff91ffff96005 R12: ffffc9000bbaeea0
R13: dffffc0000000000 R14: ffff888058c0dc80 R15: ffffffff8e009fe8
 trace_call_bpf+0x1ae/0xb50 kernel/trace/bpf_trace.c:145
 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10931
 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline]
 perf_trace_lock_acquire+0x335/0x410 include/trace/events/lock.h:24
 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline]
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x311/0x360 kernel/locking/lockdep.c:5831
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1169 [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
 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:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 bpf_check+0x1348a/0x1d720 kernel/bpf/verifier.c:24778
 bpf_prog_load+0x13ba/0x19e0 kernel/bpf/syscall.c:3062
 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6134
 __do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f45b898eec9
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:00007f45b9774038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f45b8be5fa0 RCX: 00007f45b898eec9
RDX: 0000000000000094 RSI: 0000200000000440 RDI: 0000000000000005
RBP: 00007f45b8a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f45b8be6038 R14: 00007f45b8be5fa0 R15: 00007ffee4bb3668
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
sched: DL replenish lagged too much
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6534 Comm: syz.0.166 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__cant_sleep+0xc/0x210 kernel/sched/core.c:8931
Code: 66 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 57 41 56 <41> 55 41 54 53 48 83 e4 e0 48 81 ec 80 00 00 00 65 48 8b 05 4c d1
RSP: 0018:ffffc90000a074e0 EFLAGS: 00000046
RAX: ffffffff81ca8936 RBX: 0000000000000002 RCX: ffff88802a338000
RDX: 0000000000000000 RSI: 0000000000000071 RDI: ffffffff8b706a80
RBP: ffffc90000a074f0 R08: 0000000000000001 R09: ffff8880b8732b10
R10: dffffc0000000000 R11: fffff91ffffb6805 R12: ffffe8ffffdb4000
R13: dffffc0000000000 R14: ffff8880b8732b10 R15: ffffffff8e009f80
FS:  00007f88b3bd76c0(0000) GS:ffff888125e27000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557538739168 CR3: 000000002ed12000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 trace_call_bpf+0x99/0xb50 kernel/trace/bpf_trace.c:113
 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10931
 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline]
 perf_trace_lock_acquire+0x335/0x410 include/trace/events/lock.h:24
 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline]
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x311/0x360 kernel/locking/lockdep.c:5831
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 __perf_output_begin kernel/events/ring_buffer.c:167 [inline]
 perf_output_begin_forward+0xcd/0xa80 kernel/events/ring_buffer.c:277
 __perf_event_output kernel/events/core.c:8498 [inline]
 perf_event_output_forward+0x2b2/0x430 kernel/events/core.c:8516
 __perf_event_overflow+0x82d/0xe40 kernel/events/core.c:10392
 perf_swevent_hrtimer+0x3b8/0x500 kernel/events/core.c:11786
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x4e0/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1052
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:perf_trace_lock_acquire+0x33e/0x410 include/trace/events/lock.h:24
Code: 00 00 00 4c 8b 4c 24 60 41 b8 01 00 00 00 44 89 f6 48 8b 4c 24 38 6a 00 ff 74 24 10 e8 ab 21 54 00 48 83 c4 10 4c 8b 64 24 20 <48> c7 44 24 40 0e 36 e0 45 4b c7 04 3c 00 00 00 00 43 c7 44 3c 08
RSP: 0018:ffffc90000a081c0 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffffe8ffffdb2010 RCX: 0000000000000001
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000a082b8 R08: ffffc90000a080ef R09: 0000000000000000
R10: ffffc90000a080e0 R11: ffffffffa0201a50 R12: 1ffff92000141040
R13: 000000000000000e R14: 000000000000002c R15: dffffc0000000000
 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline]
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x311/0x360 kernel/locking/lockdep.c:5831
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1169 [inline]
 unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
 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
 unpoison_slab_object mm/kasan/common.c:342 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4946 [inline]
 slab_alloc_node mm/slub.c:5245 [inline]
 kmem_cache_alloc_node_noprof+0x433/0x710 mm/slub.c:5297
 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:579
 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:670
 skb_copy+0x188/0x800 net/core/skbuff.c:2125
 mac80211_hwsim_tx_frame_no_nl+0xcd3/0x11c0 drivers/net/wireless/virtual/mac80211_hwsim.c:1891
 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2258
 mac80211_hwsim_beacon_tx+0x3f0/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2359
 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797
 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2389
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858
 handle_softirqs+0x283/0x870 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:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7256
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 2b c6 46 f6 e8 76 8f 7e f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900056ef1a0 EFLAGS: 00000286
RAX: 66f6724a3c4f5600 RBX: 0000000000000000 RCX: 66f6724a3c4f5600
RDX: 0000000000000000 RSI: ffffffff8d7e3703 RDI: 0000000000000001
RBP: ffffc900056ef250 R08: ffffffff8f9db437 R09: 1ffffffff1f3b686
R10: dffffc0000000000 R11: fffffbfff1f3b687 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000adde34
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:stack_trace_save+0x0/0xe0 kernel/stacktrace.c:114
Code: 41 5d 41 5e 41 5f 5d e9 7e b8 9e 09 cc 90 0f 0b 90 45 31 ed eb e0 0f 1f 40 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 81 ec 80 00 00 00
RSP: 0018:ffffc900056ef318 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88802a3385d0 RCX: 0000000000000000
RDX: 0000000000000002 RSI: 0000000000000010 RDI: ffffc900056ef360
RBP: ffffc900056ef460 R08: ffffc900056ef3df R09: 0000000000000000
R10: ffffc900056ef360 R11: fffff52000adde7c R12: dffffc0000000000
R13: 1ffff92000adde68 R14: ffffc900056ef360 R15: 1ffff110054670ba
 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:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
 __folio_put+0x21b/0x2c0 mm/swap.c:112
 page_pool_empty_ring net/core/page_pool.c:1083 [inline]
 page_pool_scrub net/core/page_pool.c:1149 [inline]
 page_pool_release+0x98c/0xec0 net/core/page_pool.c:1157
 page_pool_destroy+0x1d5/0x3f0 net/core/page_pool.c:1266
 xdp_test_run_teardown net/bpf/test_run.c:218 [inline]
 bpf_test_run_xdp_live+0x1a5b/0x1b20 net/bpf/test_run.c:396
 bpf_prog_test_run_xdp+0x75b/0x10e0 net/bpf/test_run.c:1331
 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4673
 __sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
 __do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f88b2d8eec9
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:00007f88b3bd7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f88b2fe6090 RCX: 00007f88b2d8eec9
RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007f88b2e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f88b2fe6128 R14: 00007f88b2fe6090 R15: 00007fff8c08f008
 </TASK>