ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u8:37:11633] Modules linked in: irq event stamp: 2689216 hardirqs last enabled at (2689215): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:214 hardirqs last disabled at (2689216): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (2689214): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (2689214): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:650 softirqs last disabled at (2689193): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (2689193): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (2689193): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 11633 Comm: kworker/u8:37 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xe02/0x1600 kernel/smp.c:877 Code: 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 75 0d 0c 00 f3 90 41 0f b6 45 00 <40> 38 c5 7c 08 84 c0 0f 85 e0 05 00 00 8b 43 08 31 ff 83 e0 01 41 RSP: 0018:ffffc9000427f878 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8540460 RCX: ffffffff81b13c81 RDX: ffff88802f8b8000 RSI: ffffffff81b13c5b RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffed10170a808d R14: 0000000000000001 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881249d2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa6c6f563c0 CR3: 000000000e182000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline] smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2923 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x376/0x550 kernel/jump_label.c:919 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:852 [inline] toggle_allocation_gate+0xfa/0x280 mm/kfence/core.c:844 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 16263 Comm: syz.8.3772 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1775 [inline] RIP: 0010:__hrtimer_run_queues+0x1d0/0xad0 kernel/time/hrtimer.c:1841 Code: 5f 07 00 00 65 48 8b 05 06 1f fb 11 48 89 4c 24 10 48 89 44 24 18 44 89 6c 24 3c e9 0f 02 00 00 e8 a5 88 13 00 48 8b 4c 24 28 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 01 84 c0 74 08 3c 03 0f 8e RSP: 0000:ffffc90000a08e40 EFLAGS: 00000046 RAX: 0000000080010001 RBX: ffff8880b8527e80 RCX: 1ffff1100815852b RDX: ffff888040ac1e40 RSI: ffffffff81a9c12b RDI: 0000000000000001 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b8527c80 R13: 0000000000000000 R14: ffff888078451340 R15: ffffffff8971fbc0 FS: 000055555d9a7500(0000) GS:ffff888124ad2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c292c48 CR3: 0000000031663000 CR4: 0000000000350ef0 Call Trace: hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:const_folio_flags.constprop.0+0xe/0x70 include/linux/page-flags.h:351 Code: ff e8 96 07 72 09 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 53 48 89 fb e8 16 41 c9 ff 48 8d 7b 08 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 RSP: 0000:ffffc9000c3579c0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffea00004cee40 RCX: ffffffff81f476f2 RDX: ffff888040ac1e40 RSI: ffffffff81f408ba RDI: ffffea00004cee48 RBP: ffffc9000c357b28 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffea00004cee00 R13: 000000000000006f R14: dffffc0000000000 R15: 1ffff9200186af68 folio_test_uptodate include/linux/page-flags.h:787 [inline] next_uptodate_folio+0x340/0x4a0 mm/filemap.c:3662 filemap_map_pages+0x5d6/0x1b70 mm/filemap.c:3856 do_fault_around mm/memory.c:5656 [inline] do_read_fault mm/memory.c:5689 [inline] do_fault mm/memory.c:5832 [inline] do_pte_missing+0xe33/0x3ba0 mm/memory.c:4361 handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault+0x1556/0x2aa0 mm/memory.c:6318 handle_mm_fault+0x589/0xd10 mm/memory.c:6487 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f625446f1ed Code: ff 48 83 e8 01 48 89 ee bf 01 00 00 00 48 c1 e0 0e 48 c1 ee 06 48 01 c8 48 89 e9 81 e6 ff 3f 00 00 48 c1 e9 03 83 e1 07 d3 e7 <40> 84 bc 06 20 20 00 00 0f 85 11 fd ff ff e9 c0 fd ff ff e8 1b 2a RSP: 002b:00007ffea53749c0 EFLAGS: 00010212 RAX: 000000110c290000 RBX: 00007f6255315720 RCX: 0000000000000003 RDX: 0000000000000a18 RSI: 0000000000000c28 RDI: 0000000000000008 RBP: ffffffff85330a18 R08: 00007f62547e6038 R09: 00007f62547d2000 R10: 00007f6253fff008 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000000 R14: ffffffff85330293 R15: 0000000000000102