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#1 stuck for 245s! [syz.3.5764:27102] Modules linked in: irq event stamp: 1484234 hardirqs last enabled at (1484233): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:214 hardirqs last disabled at (1484234): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (1484232): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (1484232): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:650 softirqs last disabled at (1484013): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (1484013): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (1484013): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 27102 Comm: syz.3.5764 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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:ffffc9000aa86bc8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880b8442680 RCX: ffffc9000fed1000 RDX: 0000000000080000 RSI: ffffffff81b0da0b RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffed10170884d1 R14: 0000000000000001 R15: 0000000000000000 FS: 00007fb7b71f66c0(0000) GS:ffff888124b06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe0cf156c0 CR3: 0000000049ad0000 CR4: 0000000000350ef0 Call Trace: 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:1381 [inline] arch_tlbbatch_flush+0x253/0x370 arch/x86/mm/tlb.c:1745 try_to_unmap_flush mm/rmap.c:649 [inline] try_to_unmap_flush_dirty+0xb9/0x140 mm/rmap.c:660 shrink_folio_list+0x2d22/0x4800 mm/vmscan.c:1452 reclaim_folio_list+0xda/0x5d0 mm/vmscan.c:2233 reclaim_pages+0x3ec/0x570 mm/vmscan.c:2270 madvise_cold_or_pageout_pte_range+0x14e5/0x20d0 mm/madvise.c:565 walk_pmd_range mm/pagewalk.c:130 [inline] walk_pud_range mm/pagewalk.c:224 [inline] walk_p4d_range mm/pagewalk.c:262 [inline] walk_pgd_range+0xc05/0x1f50 mm/pagewalk.c:303 __walk_page_range+0x163/0x820 mm/pagewalk.c:410 walk_page_range_vma+0x2c7/0xa20 mm/pagewalk.c:717 madvise_pageout_page_range mm/madvise.c:624 [inline] madvise_pageout+0x257/0x540 mm/madvise.c:649 madvise_vma_behavior+0xb14/0x2d50 mm/madvise.c:1352 madvise_walk_vmas+0x31f/0x9c0 mm/madvise.c:1669 madvise_do_behavior+0x1e2/0x530 mm/madvise.c:1885 do_madvise+0x176/0x240 mm/madvise.c:1978 __do_sys_madvise mm/madvise.c:1987 [inline] __se_sys_madvise mm/madvise.c:1985 [inline] __x64_sys_madvise+0xa9/0x110 mm/madvise.c:1985 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: 0033:0x7fb7b8f8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb7b71f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fb7b91e5fa0 RCX: 00007fb7b8f8f749 RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007fb7b9013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb7b91e6038 R14: 00007fb7b91e5fa0 R15: 00007ffeee417548 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 27108 Comm: syz.0.5765 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__this_cpu_preempt_check+0x0/0x20 lib/smp_processor_id.c:63 Code: c6 40 79 f0 8b 48 c7 c7 80 79 f0 8b e9 f9 fe ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 89 fe 48 c7 c7 c0 79 f0 8b e9 cd fe ff ff 66 2e 0f RSP: 0018:ffffc90000007cb8 EFLAGS: 00000096 RAX: 0000000000000001 RBX: ffffffff9ad6b180 RCX: ffffffff93a8af80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8da053b6 RBP: 0000000000000000 R08: a26fb770857742d4 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 000055556500c500(0000) GS:ffff888124a06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcba8895d58 CR3: 00000000621a9000 CR4: 0000000000350ef0 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lock_acquire kernel/locking/lockdep.c:5870 [inline] lock_acquire+0x189/0x350 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 debug_object_deactivate+0x135/0x3a0 lib/debugobjects.c:873 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate kernel/time/hrtimer.c:483 [inline] __run_hrtimer kernel/time/hrtimer.c:1745 [inline] __hrtimer_run_queues+0x46f/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:preempt_count_sub+0x63/0x160 kernel/sched/core.c:5833 Code: 27 19 85 c9 75 1b 65 8b 05 0a 81 18 12 89 c2 81 e2 ff ff ff 7f 39 d3 7f 17 81 fb fe 00 00 00 76 71 f7 db 65 01 1d ed 80 18 12 <5b> e9 c2 21 87 ff 90 e8 e1 91 16 03 85 c0 74 51 48 c7 c0 30 7d 82 RSP: 0018:ffffc900001074e0 EFLAGS: 00000293 RAX: 0000000080000002 RBX: 00000000ffffffff RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff8da053b6 RDI: 0000000000000001 RBP: ffff88813fffa5a0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000008 R14: dffffc0000000000 R15: 0000000000000000 rcu_read_unlock_sched include/linux/rcupdate.h:981 [inline] pfn_valid+0x279/0x4d0 include/linux/mmzone.h:2197 page_table_check_set+0x25/0x750 mm/page_table_check.c:105 __page_table_check_ptes_set+0x318/0x420 mm/page_table_check.c:209 page_table_check_ptes_set include/linux/page_table_check.h:76 [inline] set_ptes include/linux/pgtable.h:292 [inline] insert_page_into_pte_locked+0x7c9/0xb40 mm/memory.c:2313 insert_page+0x12d/0x200 mm/memory.c:2331 vm_insert_page+0x2c1/0x440 mm/memory.c:2482 kcov_mmap+0xbf/0x140 kernel/kcov.c:506 vfs_mmap include/linux/fs.h:2405 [inline] mmap_file mm/internal.h:167 [inline] __mmap_new_file_vma mm/vma.c:2413 [inline] __mmap_new_vma mm/vma.c:2476 [inline] __mmap_region+0x1309/0x27a0 mm/vma.c:2670 mmap_region+0x32b/0x3f0 mm/vma.c:2740 do_mmap+0xa3e/0x1210 mm/mmap.c:558 vm_mmap_pgoff+0x29e/0x470 mm/util.c:581 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 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: 0033:0x7fcba798f783 Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 a8 ff ff ff 64 c7 RSP: 002b:00007ffd2c2f2be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fcba7be6308 RCX: 00007fcba798f783 RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007fcba57f6000 RBP: 00007fcba7be6270 R08: 00000000000000db R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000003 R13: 00007fcba7be6270 R14: 0000000000001a30 R15: 0000000000000003