syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.2.1957:13723]
Modules linked in:
irq event stamp: 12572087
hardirqs last  enabled at (12572086): [<ffffffff8b5bbffd>] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219
hardirqs last disabled at (12572087): [<ffffffff8b5ba86e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (12570808): [<ffffffff81858cca>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (12570808): [<ffffffff81858cca>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (12570808): [<ffffffff81858cca>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
softirqs last disabled at (12570811): [<ffffffff81858cca>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (12570811): [<ffffffff81858cca>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (12570811): [<ffffffff81858cca>] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
CPU: 0 UID: 0 PID: 13723 Comm: syz.2.1957 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x10/0xb0 kernel/rcu/tree.c:751
Code: 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 41 57 41 56 53 65 ff 05 c0 14 d7 10 <e8> ab 32 b4 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000007a98 EFLAGS: 00000203
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff888060d1c0e0
RBP: ffffffff8959dddc R08: ffffc90000007757 R09: 0000000000000000
R10: ffffc90000007748 R11: fffff52000000eeb R12: 0000000000000000
R13: ffff8880569ef478 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f26815c06c0(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000029c0 CR3: 000000007ee7c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0100000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x5f/0x340 kernel/locking/lockdep.c:5831
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 garp_join_timer+0x2c/0x160 net/802/garp.c:419
 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:css_is_self include/linux/cgroup.h:366 [inline]
RIP: 0010:css_uses_rstat kernel/cgroup/rstat.c:25 [inline]
RIP: 0010:css_rstat_updated+0x84/0x520 kernel/cgroup/rstat.c:80
Code: 24 20 48 c1 eb 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 4a 89 04 33 66 42 c7 44 33 09 f3 f3 42 c6 44 33 0b f3 e8 0f 49 07 00 4c 89 f8 <48> c1 e8 03 42 80 3c 30 00 74 08 4c 89 ff e8 39 a5 6d 00 44 89 64
RSP: 0018:ffffc90004dff5c0 EFLAGS: 00000293
RAX: ffff88806de88000 RBX: 1ffff920009bfebc RCX: ffff88802e18db80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88806de88000
RBP: ffffc90004dff688 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 0000000000000000
R13: 0000607ed9e45540 R14: dffffc0000000000 R15: ffff88806de88000
 memcg_rstat_updated+0x2c/0x220 mm/memcontrol.c:575
 mod_memcg_state+0x113/0x2c0 mm/memcontrol.c:704
 account_kmem_nmi_safe mm/memcontrol.c:2783 [inline]
 obj_cgroup_uncharge_pages mm/memcontrol.c:2799 [inline]
 __memcg_kmem_uncharge_page+0x9c/0x170 mm/memcontrol.c:2890
 free_pages_prepare mm/page_alloc.c:1320 [inline]
 __free_frozen_pages+0x17b/0xd30 mm/page_alloc.c:2943
 mm_free_pgd kernel/fork.c:584 [inline]
 __mmdrop+0xb6/0x750 kernel/fork.c:726
 mmdrop include/linux/sched/mm.h:55 [inline]
 mmdrop_sched include/linux/sched/mm.h:83 [inline]
 mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline]
 finish_task_switch+0x44b/0x940 kernel/sched/core.c:5139
 context_switch kernel/sched/core.c:5259 [inline]
 __schedule+0x14c4/0x5000 kernel/sched/core.c:6863
 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:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 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 d4 38 e0 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90004dffc60 EFLAGS: 00000206
RAX: 1238278909bd3c00 RBX: 0000000000000000 RCX: 1238278909bd3c00
RDX: 00000000c7b35700 RSI: ffffffff8d978ff2 RDI: ffffffff8bc08360
RBP: ffffffff821a26bd R08: ffffffff821a26bd R09: ffffffff8e062360
R10: ffffc90004dff8c8 R11: fffff520009bff1b R12: 0000000000000000
R13: ffffffff8e062360 R14: 0000000000000001 R15: 0000000000000246
 fs_reclaim_acquire+0x99/0x100 mm/page_alloc.c:4318
 might_alloc include/linux/sched/mm.h:317 [inline]
 slab_pre_alloc_hook mm/slub.c:4904 [inline]
 slab_alloc_node mm/slub.c:5239 [inline]
 kmem_cache_alloc_lru_noprof+0x4a/0x6e0 mm/slub.c:5282
 sock_alloc_inode+0x28/0xc0 net/socket.c:322
 alloc_inode+0x6a/0x1b0 fs/inode.c:346
 new_inode_pseudo include/linux/fs.h:2964 [inline]
 sock_alloc net/socket.c:637 [inline]
 __sock_create+0x12d/0x9d0 net/socket.c:1569
 sock_create net/socket.c:1663 [inline]
 __sys_socketpair+0x23a/0x560 net/socket.c:1814
 __do_sys_socketpair net/socket.c:1863 [inline]
 __se_sys_socketpair net/socket.c:1860 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1860
 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: 0033:0x7f268078f749
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:00007f26815c0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f26809e6090 RCX: 00007f268078f749
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007f2680813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f26809e6128 R14: 00007f26809e6090 R15: 00007ffdef79f038
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
net_ratelimit: 9 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:e6:35:50:24:3e, vlan:0)
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13722 Comm: syz.2.1957 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:kasan_check_range+0x5/0x2c0 mm/kasan/generic.c:199
Code: 48 c7 c6 66 a0 97 8d e8 09 12 00 ff 90 0f 0b cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 55 <41> 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 ba 01 00 00 4c 8d
RSP: 0018:ffffc90000a07550 EFLAGS: 00000046
RAX: ffffffff81f2eb83 RBX: 0000000000000010 RCX: ffffffff81f2eba6
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90000a07608
RBP: 0000000000000000 R08: ffffc90000a0774f R09: 0000000000000000
R10: ffffc90000a07740 R11: fffff52000140eea R12: ffff888055f51920
R13: ffffc90000a07608 R14: ffffc90000a07608 R15: dffffc0000000000
FS:  00007f26815e16c0(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556860a5c8 CR3: 000000007ee7c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __asan_memset+0x22/0x50 mm/kasan/shadow.c:84
 perf_sample_data_init include/linux/perf_event.h:1358 [inline]
 perf_tp_event+0x276/0x1380 kernel/events/core.c:11079
 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:11005
 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+0x2fb/0x340 kernel/locking/lockdep.c:5831
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x6d/0x360 lib/debugobjects.c:873
 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline]
 debug_deactivate+0x1d/0x1e0 kernel/time/hrtimer.c:483
 __run_hrtimer kernel/time/hrtimer.c:1745 [inline]
 __hrtimer_run_queues+0x2b0/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2037 [inline]
RIP: 0010:vprintk_emit+0x4d0/0x5f0 kernel/printk/printk.c:2425
Code: 0f 84 34 ff ff ff e8 cf 62 20 00 fb eb 44 e8 c7 62 20 00 e8 82 62 ba 09 4d 85 f6 74 94 e8 b8 62 20 00 fb 48 c7 c7 e0 58 f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 28 26
RSP: 0018:ffffc90000a07ec0 EFLAGS: 00000246
RAX: ffffffff81a14f98 RBX: ffffffff81a14df1 RCX: ffff88802643bd00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffffff8df358e0
RBP: ffffc90000a07fd0 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 0000000000000000
R13: 000000000000006f R14: 0000000000000200 R15: 1ffff92000140fdc
 _printk+0xcf/0x120 kernel/printk/printk.c:2451
 br_fdb_update+0x62d/0x690 net/bridge/br_fdb.c:999
 br_handle_frame_finish+0x587/0x1c90 net/bridge/br_input.c:144
 br_nf_hook_thresh+0x3c6/0x4a0 net/bridge/br_netfilter_hooks.c:-1
 br_nf_pre_routing_finish_ipv6+0x999/0xd60 net/bridge/br_netfilter_ipv6.c:-1
 NF_HOOK include/linux/netfilter.h:318 [inline]
 br_nf_pre_routing_ipv6+0x37e/0x6b0 net/bridge/br_netfilter_ipv6.c:184
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
 br_handle_frame+0x96e/0x14f0 net/bridge/br_input.c:442
 __netif_receive_skb_core+0x95f/0x2f90 net/core/dev.c:6024
 __netif_receive_skb_one_core net/core/dev.c:6135 [inline]
 __netif_receive_skb+0x72/0x380 net/core/dev.c:6250
 process_backlog+0x622/0x1500 net/core/dev.c:6602
 __napi_poll+0xae/0x320 net/core/dev.c:7666
 napi_poll net/core/dev.c:7729 [inline]
 net_rx_action+0x672/0xe50 net/core/dev.c:7881
 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:finish_task_switch+0x242/0x940 kernel/sched/core.c:5114
Code: 0f 84 c2 01 00 00 48 85 db 0f 85 e9 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 28 3a cc 09 e8 83 75 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:ffffc90002f276f8 EFLAGS: 00000282
RAX: 0c60920818aa3300 RBX: 0000000000000000 RCX: 0c60920818aa3300
RDX: 0000000000000007 RSI: ffffffff8d7922ac RDI: ffffffff8bc08360
RBP: ffffc90002f27750 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: ffff88802643bd00
R13: dffffc0000000000 R14: ffff88801eae9e80 R15: ffff8880b873b498
 context_switch kernel/sched/core.c:5259 [inline]
 __schedule+0x14c4/0x5000 kernel/sched/core.c:6863
 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:arch_try_cmpxchg128 arch/x86/include/asm/cmpxchg_64.h:83 [inline]
RIP: 0010:__update_freelist_fast mm/slub.c:767 [inline]
RIP: 0010:slab_update_freelist+0x54/0x100 mm/slub.c:832
Code: 8f 04 24 4c 8b 24 24 fa 41 f7 c4 00 02 00 00 75 36 48 89 f7 4c 89 f6 48 89 ca e8 e7 fe ff ff 89 c3 eb 44 48 8b 19 48 8b 49 08 <49> 8b 06 49 8b 56 08 f0 48 0f c7 4e 20 48 89 c1 b0 01 74 4e 49 89
RSP: 0018:ffffc90002f27b48 EFLAGS: 00000202
RAX: 0c60920818aa3300 RBX: ffff888055ba4000 RCX: 0000000000040003
RDX: ffffc90002f27bb0 RSI: ffffea000156e800 RDI: ffff88813ffa7140
RBP: ffffc90002f27bf8 R08: 0000000000000001 R09: ffffffff822820cc
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 0000000000000001
R13: ffff888055ba4000 R14: ffffc90002f27bb0 R15: 0000000000040004
 __slab_free+0x104/0x2a0 mm/slub.c:5937
 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:349
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5270
 lsm_inode_alloc security/security.c:228 [inline]
 security_inode_alloc+0x39/0x330 security/security.c:1189
 inode_init_always_gfp+0x9ed/0xdc0 fs/inode.c:306
 inode_init_always include/linux/fs.h:2883 [inline]
 alloc_inode+0x82/0x1b0 fs/inode.c:353
 new_inode_pseudo include/linux/fs.h:2964 [inline]
 sock_alloc net/socket.c:637 [inline]
 __sock_create+0x12d/0x9d0 net/socket.c:1569
 sock_create net/socket.c:1663 [inline]
 __sys_socketpair+0x1c5/0x560 net/socket.c:1810
 __do_sys_socketpair net/socket.c:1863 [inline]
 __se_sys_socketpair net/socket.c:1860 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1860
 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: 0033:0x7f268078f749
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:00007f26815e1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f26809e5fa0 RCX: 00007f268078f749
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007f2680813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f26809e6038 R14: 00007f26809e5fa0 R15: 00007ffdef79f038
 </TASK>