watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.8.6800:7802] Modules linked in: irq event stamp: 11114319 hardirqs last enabled at (11114318): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (11114319): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (7212828): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (7212828): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (7212828): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (7212831): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (7212831): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (7212831): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 7802 Comm: syz.8.6800 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:___slab_alloc+0xbe1/0x1790 mm/slub.c:4735 Code: c5 00 02 00 00 74 05 e8 1d be a9 ff 9c 58 a9 00 02 00 00 0f 85 90 09 00 00 f7 c5 00 02 00 00 74 01 fb 65 48 8b 05 ef ec d2 10 <48> 3b 44 24 70 0f 85 00 0a 00 00 4c 89 f8 48 83 c4 78 5b 41 5c 41 RSP: 0018:ffffc90000007938 EFLAGS: 00000206 RAX: 41d57c5cff849d00 RBX: ffff8880b8643530 RCX: 0000000000000103 RDX: 0000000000000002 RSI: ffffffff8dcd201e RDI: ffffffff8c076280 RBP: 0000000000000246 R08: ffffffff8ff01677 R09: 1ffffffff1fe02ce R10: dffffc0000000000 R11: fffffbfff1fe02cf R12: ffff8880b8643530 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880931f4000 FS: 00007fbca6f666c0(0000) GS:ffff8881256c8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a842e65a30 CR3: 000000005ee36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] kmem_cache_alloc_node_noprof+0x4b5/0x6f0 mm/slub.c:5315 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586 __alloc_skb+0x204/0x390 net/core/skbuff.c:690 alloc_skb include/linux/skbuff.h:1383 [inline] new_skb+0x2f/0x2b0 drivers/block/aoe/aoecmd.c:66 aoecmd_cfg_pkts drivers/block/aoe/aoecmd.c:430 [inline] aoecmd_cfg+0x2b1/0x800 drivers/block/aoe/aoecmd.c:1374 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 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:memcpy_orig+0xc8/0x130 arch/x86/lib/memcpy_64.S:137 Code: 89 07 4c 89 4f 08 4c 89 54 17 f0 4c 89 5c 17 f8 e9 3d c2 02 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 83 fa 08 72 1b 4c 8b 06 <4c> 8b 4c 16 f8 4c 89 07 4c 89 4c 17 f8 e9 16 c2 02 00 66 0f 1f 44 RSP: 0018:ffffc9000d676a78 EFLAGS: 00000206 RAX: ffffe8ffffcd8018 RBX: ffffe8ffffcd8000 RCX: ffffffff819fc4cf RDX: 000000000000000d RSI: ffffffff8bae0cc0 RDI: ffffe8ffffcd8018 RBP: ffffc9000d676b78 R08: 646165725f756372 R09: 1ffffd1ffff9b004 R10: dffffc0000000000 R11: fffff91ffff9b005 R12: 0000000000000002 R13: 000000000000000e R14: dffffc0000000000 R15: 1ffff92001aced58 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x2cf/0x420 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+0x2ea/0x330 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [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 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x1570/0x5260 kernel/sched/core.c:6907 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 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 d1 f6 fa 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 4b 04 55 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 a8 e4 52 RSP: 0018:ffffc9000d677458 EFLAGS: 00000282 RAX: 41d57c5cff849d00 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 00000000c0065176 RSI: ffffffff8df3f967 RDI: ffffffff8c076280 RBP: ffffffff8175b275 R08: ffffffff8175b275 R09: ffffffff8e55df20 R10: ffffc9000d677200 R11: ffffffffa020510c R12: 0000000000000002 R13: ffffffff8e55df20 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [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:1433 [inline] __free_frozen_pages+0xbf8/0xd70 mm/page_alloc.c:2973 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 __slab_free+0x294/0x320 mm/slub.c:5956 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 taskstats_tgid_alloc kernel/taskstats.c:576 [inline] taskstats_exit+0x14a/0xa30 kernel/taskstats.c:615 do_exit+0x60e/0x2310 kernel/exit.c:941 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112 get_signal+0x1284/0x1330 kernel/signal.c:3034 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __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 include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbca959bf79 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:00007fbca6f66028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000014 RBX: 00007fbca9816360 RCX: 00007fbca959bf79 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000200 RBP: 00007fbca96327e0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbca98163f8 R14: 00007fbca9816360 R15: 00007fff9bcf0698 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3550 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216 Code: 8b 3d 24 ee 33 0c 48 89 de 5b e9 f3 a0 5d 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 08 08 31 11 65 8b 15 29 08 31 11 81 e2 00 01 ff 00 74 RSP: 0018:ffffc9000c317718 EFLAGS: 00000202 RAX: ffffffff81b8824d RBX: 1ffff110170c8585 RCX: ffff88802fec5ac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000c317860 R08: ffffffff8ff01677 R09: 1ffffffff1fe02ce R10: dffffc0000000000 R11: fffffbfff1fe02cf R12: ffff8880b8642c28 R13: dffffc0000000000 R14: ffff8880b873bb80 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881257c8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc145cf319 CR3: 000000000e34a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xcfd/0x1270 kernel/smp.c:877 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2746 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2956 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 toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:899 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245