ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#0 stuck for 245s! [kworker/u8:4:63] Modules linked in: irq event stamp: 4628402 hardirqs last enabled at (4628401): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:357 hardirqs last disabled at (4628402): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (4628400): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (4628400): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:607 softirqs last disabled at (4628361): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (4628361): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (4628361): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 63 Comm: kworker/u8:4 Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x4cc/0x1290 kernel/smp.c:885 Code: 00 f3 90 41 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 de 0b 00 00 8b 43 08 31 ff 83 e0 01 41 89 c5 89 c6 e8 d7 12 0c 00 45 85 ed <75> d0 e8 8d 17 0c 00 e8 88 17 0c 00 8b 2c 24 bf 07 00 00 00 83 c5 RSP: 0018:ffffc90001557938 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff8880b853f880 RCX: ffffffff81af18b9 RDX: ffff88801cfc9e00 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed10170a7f11 R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8880b843b180 FS: 0000000000000000(0000) GS:ffff8881249e9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f57d41a3290 CR3: 000000000e180000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2455 [inline] text_poke_bp_batch+0x220/0x760 arch/x86/kernel/alternative.c:2665 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline] text_poke_flush arch/x86/kernel/alternative.c:2853 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2863 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:850 [inline] toggle_allocation_gate+0xfa/0x280 mm/kfence/core.c:842 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153 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: 7558 Comm: syz.1.367 Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 56 67 54 00 48 89 df 5b e9 8d c2 59 00 be 03 00 00 00 5b e9 32 46 13 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 34 24 65 48 8b 15 b8 3f e8 11 65 8b 05 c9 3f e8 RSP: 0018:ffffc90000a08e20 EFLAGS: 00000097 RAX: 0000000080010002 RBX: 0000000000000001 RCX: ffffffff81a83dd9 RDX: ffff88802b848000 RSI: 0000000000000007 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b8527840 R13: 18495dea52577910 R14: ffff888058918340 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124ae9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c34ee9f CR3: 0000000079197000 CR4: 0000000000350ef0 Call Trace: cpumask_test_cpu include/linux/cpumask.h:587 [inline] cpu_online include/linux/cpumask.h:1143 [inline] trace_hrtimer_cancel+0x37/0x200 include/trace/events/timer.h:317 debug_deactivate kernel/time/hrtimer.c:491 [inline] __run_hrtimer kernel/time/hrtimer.c:1729 [inline] __hrtimer_run_queues+0x477/0xad0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:mm_counter include/linux/mm.h:2744 [inline] RIP: 0010:zap_present_folio_ptes mm/memory.c:1511 [inline] RIP: 0010:zap_present_ptes mm/memory.c:1586 [inline] RIP: 0010:do_zap_pte_range mm/memory.c:1687 [inline] RIP: 0010:zap_pte_range mm/memory.c:1731 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1823 [inline] RIP: 0010:zap_pud_range mm/memory.c:1852 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1873 [inline] RIP: 0010:unmap_page_range+0x146e/0x4390 mm/memory.c:1894 Code: 85 16 2d 00 00 48 8b 44 24 48 31 ff 48 8b 40 18 48 89 44 24 08 44 0f b6 6c 24 08 41 83 e5 01 44 89 ee e8 95 5a b5 ff 45 84 ed <0f> 84 91 09 00 00 e8 a7 5f b5 ff 4c 8d ac 24 74 01 00 00 e8 9a 5f RSP: 0018:ffffc90004637838 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 8000000075bce025 RCX: ffffffff8205d09b RDX: ffff88802b848000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888056a2f280 unmap_single_vma+0x194/0x2a0 mm/memory.c:1940 unmap_vmas+0x22c/0x490 mm/memory.c:1984 exit_mmap+0x1b9/0xb90 mm/mmap.c:1284 __mmput+0x12a/0x410 kernel/fork.c:1379 mmput+0x62/0x70 kernel/fork.c:1401 exit_mm kernel/exit.c:589 [inline] do_exit+0x9d1/0x2c30 kernel/exit.c:940 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102 __do_sys_exit_group kernel/exit.c:1113 [inline] __se_sys_exit_group kernel/exit.c:1111 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f899338e969 Code: Unable to access opcode bytes at 0x7f899338e93f. RSP: 002b:00007ffd5f84f6c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f899338e969 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffd5f84f72c R08: 000000075f84f7bf R09: 00000000000927c0 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000054 R13: 00000000000927c0 R14: 00000000000482e2 R15: 00007ffd5f84f780