syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 118s! [syz.0.383:7861]
Modules linked in:
irq event stamp: 11193155
hardirqs last  enabled at (11193154): [<ffffffff8b7a4234>] irqentry_exit+0x74/0x90 kernel/entry/common.c:200
hardirqs last disabled at (11193155): [<ffffffff8b7a2e6e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050
softirqs last  enabled at (960644): [<ffffffff8185050a>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last  enabled at (960644): [<ffffffff8185050a>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last  enabled at (960644): [<ffffffff8185050a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
softirqs last disabled at (960647): [<ffffffff8185050a>] __do_softirq kernel/softirq.c:613 [inline]
softirqs last disabled at (960647): [<ffffffff8185050a>] invoke_softirq kernel/softirq.c:453 [inline]
softirqs last disabled at (960647): [<ffffffff8185050a>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
CPU: 1 UID: 0 PID: 7861 Comm: syz.0.383 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:stack_trace_consume_entry+0x5/0x280 kernel/stacktrace.c:83
Code: f0 5b 41 5e 5d c3 cc cc cc cc cc e8 05 ec cd 09 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 18 48 ba 00 00 00 00 00 fc ff
RSP: 0018:ffffc90000a084b8 EFLAGS: 00000286
RAX: ffffffff8b7a2f06 RBX: ffffc90000a08580 RCX: 43b4dbe8ff6b3b00
RDX: 0000000000000001 RSI: ffffffff8b7a2f06 RDI: ffffc90000a08580
RBP: ffffc90000a08550 R08: ffffc90000a08527 R09: 0000000000000000
R10: ffffc90000a08518 R11: ffffffff81ac4b00 R12: ffff8880608d9e00
R13: 0000000000000000 R14: ffffffff81ac4b00 R15: ffffc90000a084c8
FS:  00007f7f0d85e6c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff365b056c0 CR3: 0000000060750000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x10d/0x150 arch/x86/kernel/stacktrace.c:27
 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]
 kmem_cache_free+0x18f/0x400 mm/slub.c:4797
 skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1086
 skb_release_all net/core/skbuff.c:1151 [inline]
 __kfree_skb+0x55/0x70 net/core/skbuff.c:1165
 tcp_write_queue_purge+0x143/0x300 net/ipv4/tcp.c:3315
 tcp_done_with_error+0x43/0xd0 net/ipv4/tcp_input.c:4421
 tcp_write_err net/ipv4/tcp_timer.c:77 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:294 [inline]
 tcp_retransmit_timer+0x1d16/0x3370 net/ipv4/tcp_timer.c:600
 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: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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5945
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 f9 73 26 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900030c6fd8 EFLAGS: 00000206
RAX: 43b4dbe8ff6b3b00 RBX: 0000000000000001 RCX: 43b4dbe8ff6b3b00
RDX: ffff8880608d9e00 RSI: ffffffff8dba9339 RDI: ffffffff8be33d80
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff81cb1657
R10: dffffc0000000000 R11: fffff91ffffb4223 R12: 0000000000000246
R13: ffff8880608d9e00 R14: ffffffff8e13a0e0 R15: 0000000000000001
 trace_call_bpf+0x1ad/0x850 kernel/trace/bpf_trace.c:146
 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10918
 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:1155 [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
 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_noprof+0x1c1/0x3c0 mm/slub.c:4247
 alloc_empty_file+0x55/0x1d0 fs/file_table.c:237
 path_openat+0x107/0x3830 fs/namei.c:4032
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1461
 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: 0033:0x7f7f0c98eba9
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:00007f7f0d85e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f7f0cbd6090 RCX: 00007f7f0c98eba9
RDX: 0000000000200002 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f7f0ca11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7f0cbd6128 R14: 00007f7f0cbd6090 R15: 00007ffec5c41618
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7857 Comm: syz.0.383 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rcu_rdp_cpu_online kernel/rcu/tree.c:3994 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x87/0x120 kernel/rcu/tree.c:4035
Code: 3c 30 00 74 08 48 89 df e8 c6 78 7c 00 48 8b 03 48 8d 98 80 5f a2 92 48 8d b8 a8 5f a2 92 48 89 f8 48 c1 e8 03 42 80 3c 30 00 <74> 05 e8 a2 78 7c 00 4c 8b 7b 28 48 83 c3 20 48 89 d8 48 c1 e8 03
RSP: 0018:ffffc90000006cd0 EFLAGS: 00000046
RAX: 1ffff110170c75f5 RBX: ffff8880b863af80 RCX: 50e24af43a5c2d00
RDX: ffff8880277c5a00 RSI: ffffffff8be33d60 RDI: ffff8880b863afa8
RBP: ffffc90000006df8 R08: 0000000000000000 R09: ffffffff81cb1657
R10: 3e2d735f5f5f5f26 R11: 746e756f63716573 R12: 0000000000000001
R13: ffffc90000006d80 R14: dffffc0000000000 R15: ffffffff8e0090e8
FS:  00007f7f0d87f6c0(0000) GS:ffff888125c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b6d739ff8 CR3: 0000000060750000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
 rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349
 trace_call_bpf+0x1ad/0x850 kernel/trace/bpf_trace.c:146
 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10918
 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
 seqcount_lockdep_reader_access+0xc9/0x1c0 include/linux/seqlock.h:72
 ktime_get_update_offsets_now+0x60/0x3d0 kernel/time/timekeeping.c:2556
 hrtimer_update_base kernel/time/hrtimer.c:640 [inline]
 hrtimer_interrupt+0x132/0xaa0 kernel/time/hrtimer.c:1869
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:228 [inline]
RIP: 0010:unwind_next_frame+0x29d/0x2390 arch/x86/kernel/unwind_orc.c:494
Code: ac 2a 90 48 3d fc 43 e0 90 0f 87 0c 18 00 00 45 39 e8 48 bd 00 00 00 00 00 fc ff df 0f 84 03 02 00 00 4a 8d 14 ad 60 9c b1 8f <45> 29 e8 4a 8d 1c 82 48 83 c3 fc 49 89 d5 48 39 da 0f 86 1c 10 00
RSP: 0018:ffffc90000007378 EFLAGS: 00000206
RAX: ffffffff903ff36c RBX: dffffc0000000000 RCX: 50e24af43a5c2d00
RDX: ffffffff8fbfcb90 RSI: ffffffff903ff300 RDI: ffffffff8be33d20
RBP: dffffc0000000000 R08: 0000000000038bde R09: ffffffff8172d195
R10: ffffc900000070e0 R11: ffffffffa0201648 R12: ffffffff8218e917
R13: 0000000000038bcc R14: ffffc90000007448 R15: 00000000000118e9
 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
 unpoison_slab_object mm/kasan/common.c:330 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356
 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_node_noprof+0x1bb/0x3c0 mm/slub.c:4292
 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:578
 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:669
 skb_copy+0x188/0x800 net/core/skbuff.c:2124
 mac80211_hwsim_tx_frame_no_nl+0xcd3/0x11c0 drivers/net/wireless/virtual/mac80211_hwsim.c:1871
 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2222
 mac80211_hwsim_beacon_tx+0x3f0/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2323
 __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/0x1c0 drivers/net/wireless/virtual/mac80211_hwsim.c:2353
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
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 cb 99 4a 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> e3 3e 13 f6 65 8b 05 6c e1 23 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc900031878e0 EFLAGS: 00000206
RAX: 50e24af43a5c2d00 RBX: 0000000000000a02 RCX: 50e24af43a5c2d00
RDX: 0000000000000007 RSI: ffffffff8d9b9eb1 RDI: 0000000000000001
RBP: ffffc90003187960 R08: ffffffff8fa3a437 R09: 1ffffffff1f47486
R10: dffffc0000000000 R11: fffffbfff1f47487 R12: dffffc0000000000
R13: 0000000000110001 R14: ffff88801bad7840 R15: 1ffff92000630f1c
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __slab_free+0x2f8/0x3c0 mm/slub.c:4604
 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]
 __kmalloc_cache_noprof+0x1be/0x3d0 mm/slub.c:4402
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 bpf_prog_alloc_no_stats+0xdb/0x4b0 kernel/bpf/core.c:108
 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:150
 bpf_prog_load+0x735/0x1930 kernel/bpf/syscall.c:2889
 __sys_bpf+0x528/0x870 kernel/bpf/syscall.c:6029
 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137
 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: 0033:0x7f7f0c98eba9
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:00007f7f0d87f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7f0cbd5fa0 RCX: 00007f7f0c98eba9
RDX: 0000000000000048 RSI: 0000200000000200 RDI: 0000000000000005
RBP: 00007f7f0ca11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7f0cbd6038 R14: 00007f7f0cbd5fa0 R15: 00007ffec5c41618
 </TASK>