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 220s! [kworker/u8:1:13] Modules linked in: irq event stamp: 26897304 hardirqs last enabled at (26897303): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:357 hardirqs last disabled at (26897304): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (26897302): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (26897302): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:607 softirqs last disabled at (26897271): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (26897271): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (26897271): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.15.0-rc5-syzkaller-00353-gcd802e7e5f1e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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:ffffc90000127938 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff8880b853f880 RCX: ffffffff81af1889 RDX: ffff88801dad0000 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:ffff8881249e5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d41eff8 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: 25359 Comm: udevd Not tainted 6.15.0-rc5-syzkaller-00353-gcd802e7e5f1e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:check_region_inline mm/kasan/generic.c:169 [inline] RIP: 0010:kasan_check_range+0x150/0x1a0 mm/kasan/generic.c:189 Code: c0 01 49 89 d3 48 39 d0 74 11 80 38 00 74 ef 4d 8d 1c 2c 48 89 c2 48 85 c0 75 93 48 89 da 4c 89 d8 4c 29 da e9 2c ff ff ff 5b 01 00 00 00 5d 41 5c e9 ce 90 f0 fe b8 01 00 00 00 e9 c4 90 f0 RSP: 0018:ffffc90000a08d90 EFLAGS: 00000046 RAX: ffffed10170a4f09 RBX: ffff8880b8527840 RCX: ffffffff81985b3d RDX: ffffed10170a4f09 RSI: 0000000000000004 RDI: ffff8880b8527840 RBP: ffffed10170a4f08 R08: 0000000000000001 R09: ffffed10170a4f08 R10: ffff8880b8527843 R11: 0000000000000000 R12: ffff8880b8527848 R13: ffff8880b8527850 R14: ffff888031b57340 R15: 0000000000000001 FS: 00007f7231960880(0000) GS:ffff888124ae5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001480 CR3: 0000000062777000 CR4: 0000000000350ef0 Call Trace: instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline] queued_spin_lock include/asm-generic/qspinlock.h:111 [inline] do_raw_spin_lock+0x11d/0x2b0 kernel/locking/spinlock_debug.c:116 __run_hrtimer kernel/time/hrtimer.c:1765 [inline] __hrtimer_run_queues+0x2bc/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:page_ext_invalid mm/page_ext.c:245 [inline] RIP: 0010:lookup_page_ext+0x111/0x190 mm/page_ext.c:261 Code: ff 31 ff 41 89 c4 89 c6 e8 6c 0c 90 ff 45 85 e4 74 64 e8 22 11 90 ff 48 85 ed 74 1b e8 18 11 90 ff 49 89 ec 31 ff 41 83 e4 01 <4c> 89 e6 e8 77 0c 90 ff 4d 85 e4 74 15 e8 fd 10 90 ff 31 ed 5b 48 RSP: 0018:ffffc9000c7ff540 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000055ea7 RCX: ffffffff822b1ef4 RDX: ffff8880277cbc00 RSI: ffffffff822b1f08 RDI: 0000000000000000 RBP: ffff88801c700000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 page_ext_get+0x58/0x1a0 mm/page_ext.c:539 __reset_page_owner+0x2b/0x1a0 mm/page_owner.c:294 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] free_unref_folios+0x999/0x1630 mm/page_alloc.c:2782 folios_put_refs+0x56f/0x740 mm/swap.c:992 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x58f/0x1150 mm/shmem.c:1125 shmem_truncate_range mm/shmem.c:1237 [inline] shmem_evict_inode+0x3a1/0xbe0 mm/shmem.c:1365 evict+0x3e6/0x920 fs/inode.c:810 iput_final fs/inode.c:1898 [inline] iput fs/inode.c:1924 [inline] iput+0x521/0x880 fs/inode.c:1910 dentry_unlink_inode+0x29c/0x480 fs/dcache.c:457 __dentry_kill+0x1d0/0x600 fs/dcache.c:660 dput.part.0+0x4b1/0x9b0 fs/dcache.c:902 dput+0x1f/0x30 fs/dcache.c:892 __fput+0x51c/0xb70 fs/file_table.c:473 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f72312a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffe655c2500 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007f7231960880 RCX: 00007f72312a7407 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 00007f72319606e8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002 R13: 000055dcea57a420 R14: 0000000000000008 R15: 000055dcea57ae10