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 225s! [syz.6.1372:9775] Modules linked in: irq event stamp: 617092 hardirqs last enabled at (617091): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:214 hardirqs last disabled at (617092): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (617090): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (617090): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:650 softirqs last disabled at (617065): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (617065): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (617065): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 9775 Comm: syz.6.1372 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x20 kernel/kcov.c:314 Code: bf 03 00 00 00 e9 58 fe ff ff 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 48 8b 0c 24 <89> f2 89 fe bf 05 00 00 00 e9 2a fe ff ff 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc9000b137698 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff8880b8540460 RCX: ffffffff81b12b11 RDX: 0000000000080000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffed10170a808d R14: 0000000000000001 R15: 0000000000000001 FS: 00007fc12f8006c0(0000) GS:ffff8881249d9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd498fe7dac CR3: 0000000027a21000 CR4: 0000000000350ef0 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xe21/0x1600 kernel/smp.c:877 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x4a0/0x17a0 arch/x86/mm/tlb.c:1451 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline] tlb_flush_mmu mm/mmu_gather.c:403 [inline] tlb_finish_mmu+0x3c9/0x7c0 mm/mmu_gather.c:497 vms_clear_ptes+0x55e/0x770 mm/vma.c:1235 vms_complete_munmap_vmas+0x1ca/0x970 mm/vma.c:1277 do_vmi_align_munmap+0x446/0x7e0 mm/vma.c:1536 do_vmi_munmap+0x204/0x3e0 mm/vma.c:1584 __vm_munmap+0x196/0x380 mm/vma.c:3156 __do_sys_munmap mm/mmap.c:1080 [inline] __se_sys_munmap mm/mmap.c:1077 [inline] __x64_sys_munmap+0x59/0x80 mm/mmap.c:1077 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc12e98f057 Code: 00 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 0b 00 00 00 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:00007fc12f7ffe18 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fc12e98f057 RDX: 0000000000000000 RSI: 0000000008400000 RDI: 00007fc124600000 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000975e R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000003 R13: 00007fc12f7ffef0 R14: 00007fc12f7ffeb0 R15: 00007fc124600000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 9797 Comm: syz.1.1381 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:114 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:128 [inline] RIP: 0010:lock_acquire kernel/locking/lockdep.c:5864 [inline] RIP: 0010:lock_acquire+0x133/0x350 kernel/locking/lockdep.c:5825 Code: 00 65 8b 05 d7 97 0b 12 85 c0 0f 85 a2 00 00 00 65 48 8b 05 17 56 0b 12 8b 90 2c 0b 00 00 85 d2 0f 85 8c 00 00 00 9c 8f 04 24 48 c7 c7 89 4d bf 8d e8 30 b1 cb 09 45 89 e0 89 e9 44 89 ea 65 RSP: 0018:ffffc90000a08d08 EFLAGS: 00000046 RAX: ffff8880299e1e40 RBX: ffff888079deb300 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8b67660e RDI: ffffed100f3bd660 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124ad9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555586b8f5c8 CR3: 000000003211a000 CR4: 0000000000350ef0 Call Trace: __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] advance_sched+0xd9/0xc80 net/sched/sch_taprio.c:929 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1841 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:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216 Code: e9 dd 22 5c 00 be 03 00 00 00 5b e9 22 37 ed 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 a8 37 e7 11 65 8b 05 b9 37 e7 11 a9 00 01 ff 00 74 1d RSP: 0018:ffffc9000b017800 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffea0001a81300 RCX: ffffffff8211115e RDX: ffff8880299e1e40 RSI: ffffffff8208277a RDI: ffffea0001a81300 RBP: ffffc9000b0179a8 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 000000110c278000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffea0001a81300 const_folio_flags.constprop.0+0xa/0x70 include/linux/page-flags.h:349 folio_test_head include/linux/page-flags.h:844 [inline] folio_test_large include/linux/page-flags.h:865 [inline] folio_mapcount include/linux/mm.h:1206 [inline] zap_present_folio_ptes mm/memory.c:1653 [inline] zap_present_ptes mm/memory.c:1709 [inline] do_zap_pte_range mm/memory.c:1810 [inline] zap_pte_range mm/memory.c:1854 [inline] zap_pmd_range mm/memory.c:1946 [inline] zap_pud_range mm/memory.c:1975 [inline] zap_p4d_range mm/memory.c:1996 [inline] unmap_page_range+0x1b08/0x41b0 mm/memory.c:2017 unmap_single_vma.constprop.0+0x153/0x240 mm/memory.c:2060 unmap_vmas+0x218/0x470 mm/memory.c:2104 exit_mmap+0x1b2/0xb90 mm/mmap.c:1280 __mmput+0x12a/0x410 kernel/fork.c:1133 mmput+0x62/0x70 kernel/fork.c:1156 exit_mm kernel/exit.c:582 [inline] do_exit+0x7c7/0x2bf0 kernel/exit.c:954 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107 __do_sys_exit_group kernel/exit.c:1118 [inline] __se_sys_exit_group kernel/exit.c:1116 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1116 x64_sys_call+0x150b/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/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd498d8efc9 Code: Unable to access opcode bytes at 0x7fd498d8ef9f. RSP: 002b:00007ffd586fa1b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd498d8efc9 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffd586fa21c R08: 00000004586fa2af R09: 00000000000927c0 R10: 0000000000000001 R11: 0000000000000246 R12: 00000000000000f8 R13: 00000000000927c0 R14: 0000000000041313 R15: 00007ffd586fa270