ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz-executor178:5078] Modules linked in: irq event stamp: 247116 hardirqs last enabled at (247115): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:351 hardirqs last disabled at (247116): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043 softirqs last enabled at (247114): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (247114): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (247107): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (247107): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (247107): [] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 CPU: 1 PID: 5078 Comm: syz-executor178 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x60 kernel/kcov.c:207 Code: 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 65 48 8b 15 c4 97 75 7e 65 8b 05 c5 97 75 7e 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 14 16 00 00 RSP: 0018:ffffc900044e78f8 EFLAGS: 00000202 RAX: 0000000000000002 RBX: ffff8880b94463e0 RCX: ffffffff818236ab RDX: ffff88807b958000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1017288c7d R13: 0000000000000001 R14: ffff8880b94463e8 R15: ffff8880b953f880 FS: 000055558b242380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055968184ee80 CR3: 0000000079296000 CR4: 0000000000350ef0 Call Trace: rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline] cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] csd_lock_wait kernel/smp.c:311 [inline] smp_call_function_many_cond+0x4e5/0x1590 kernel/smp.c:855 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:944 [inline] flush_tlb_mm_range+0x293/0x330 arch/x86/mm/tlb.c:1030 dup_mmap kernel/fork.c:776 [inline] dup_mm kernel/fork.c:1687 [inline] copy_mm kernel/fork.c:1736 [inline] copy_process+0x74be/0x9160 kernel/fork.c:2389 kernel_clone+0xfd/0x940 kernel/fork.c:2796 __do_sys_clone+0xba/0x100 kernel/fork.c:2939 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fbdded40de3 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007fffd1315d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbdded40de3 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 000055558b242650 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000001ce83 R14: 00007fffd1315e7c R15: 0000000000000003