watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz.9.3309:20755] Modules linked in: irq event stamp: 11440849 hardirqs last enabled at (11440848): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (11440849): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (7567792): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (7567792): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (7567792): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (7567795): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (7567795): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (7567795): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 20755 Comm: syz.9.3309 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:751 Code: 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 f0 e4 48 11 e8 eb ad ed 09 <89> c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 RSP: 0018:ffffc90000a08718 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000102 RDX: 0000000000000000 RSI: ffffffff8c073c60 RDI: ffffffff8c073c20 RBP: ffffffff81759195 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90000a08580 R11: ffffffff81afb200 R12: 0000000000000002 R13: ffffffff8e55a3a0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fa2ff5f66c0(0000) GS:ffff8881257f7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555571c504e8 CR3: 000000003ed2c000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000006 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x5f/0x330 kernel/locking/lockdep.c:5831 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+0xc2/0x23c0 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:3119 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3239 slab_free_hook mm/slub.c:2504 [inline] slab_free mm/slub.c:6670 [inline] kmem_cache_free+0x481/0x610 mm/slub.c:6781 mempool_free+0xec/0x130 mm/mempool.c:712 blk_update_request+0x57e/0xe60 block/blk-mq.c:1007 scsi_end_request+0x7c/0x820 drivers/scsi/scsi_lib.c:638 scsi_io_completion+0x131/0x360 drivers/scsi/scsi_lib.c:1079 blk_complete_reqs block/blk-mq.c:1244 [inline] blk_done_softirq+0x10a/0x160 block/blk-mq.c:1249 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:preempt_schedule_irq+0x48/0xa0 kernel/sched/core.c:7190 Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 f3 63 fa f5 e8 3e e0 33 f6 fb bf 01 00 00 00 43 a9 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 c4 e1 33 f6 bf 01 RSP: 0018:ffffc9000ca4ef60 EFLAGS: 00000206 RAX: 00000000007379b1 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8dccc94a RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff8fef0077 R09: 1ffffffff1fde00e R10: dffffc0000000000 R11: fffffbfff1fde00f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline] RIP: 0010:preempt_schedule_notrace+0x3c/0x90 kernel/sched/core.c:7132 Code: 7f 75 09 9c 58 a9 00 02 00 00 75 09 5b 41 5e c3 cc cc cc cc cc 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 e2 <65> ff 05 5d 21 5a 07 bf 01 00 00 00 e8 43 8b fb f5 bf 01 00 00 00 RSP: 0018:ffffc9000ca4f080 EFLAGS: 00000206 RAX: 0000000000000246 RBX: ffffffff81759195 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000ca4f0e0 R08: ffffc9000ca4ef0f R09: 0000000000000000 R10: ffffc9000ca4ef00 R11: ffffffffa02036d4 R12: ffffc9000ca4f370 R13: ffffffff81759195 R14: dffffc0000000000 R15: ffffffff8e55a3a0 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13 class_preempt_notrace_destructor include/linux/preempt.h:469 [inline] __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x391/0x3a0 kernel/locking/lockdep.c:5879 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+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 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_node_noprof+0x427/0x6f0 mm/slub.c:5315 preload_this_cpu_lock+0x49/0xc0 mm/vmalloc.c:1903 alloc_vmap_area+0x454/0x14a0 mm/vmalloc.c:2073 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3219 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4011 __vmalloc_node_noprof mm/vmalloc.c:4111 [inline] __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4127 bpf_prog_alloc_no_stats+0x4a/0x4f0 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:155 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2992 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6228 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa30139aeb9 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:00007fa2ff5f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fa301615fa0 RCX: 00007fa30139aeb9 RDX: 0000000000000090 RSI: 0000200000000140 RDI: 0000000000000005 RBP: 00007fa301408c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa301616038 R14: 00007fa301615fa0 R15: 00007ffc7ef1fd08 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 17280 Comm: kworker/u8:40 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:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x1270 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 c4 db 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 6f d7 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 53 d7 RSP: 0018:ffffc90004fef6a0 EFLAGS: 00000293 RAX: ffffffff81b89f1d RBX: 1ffff110170e8129 RCX: ffff888032308000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90004fef7e0 R08: ffffffff8fef0077 R09: 1ffffffff1fde00e R10: dffffc0000000000 R11: fffffbfff1fde00f R12: ffff8880b8740948 R13: dffffc0000000000 R14: ffff8880b863bb00 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881256f7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff939800218 CR3: 000000000e346000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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:2711 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2921 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/0x250 mm/kfence/core.c:874 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+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246