watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz-executor:11098] Modules linked in: irq event stamp: 1909702 hardirqs last enabled at (1909701): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:515 [inline] hardirqs last enabled at (1909701): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:550 [inline] hardirqs last enabled at (1909701): [] irqentry_exit+0x246/0x790 kernel/entry/common.c:164 hardirqs last disabled at (1909702): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1061 softirqs last enabled at (1909694): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (1909694): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (1909694): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 softirqs last disabled at (1909585): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (1909585): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (1909585): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 CPU: 1 UID: 0 PID: 11098 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:native_pause arch/x86/include/asm/vdso/processor.h:13 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x587/0x1700 kernel/smp.c:892 Code: 54 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 69 83 0c 00 90 41 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 63 0f 00 00 8b 45 RSP: 0018:ffffc900036ef620 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fbfebd RDX: ffff88802844dc40 RSI: ffffffff81fbfe97 RDI: ffff88802844dc40 RBP: ffff8880b8443180 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed1017088631 R14: 0000000000000001 R15: ffff8880b853c700 FS: 0000555593cf8500(0000) GS:ffff888124473000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb26cbd160 CR3: 0000000063189000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x45f/0x16f0 arch/x86/mm/tlb.c:1451 dup_mmap+0x12e8/0x2180 mm/mmap.c:1905 dup_mm kernel/fork.c:1534 [inline] copy_mm kernel/fork.c:1586 [inline] copy_process+0x6c63/0x7e00 kernel/fork.c:2264 kernel_clone+0x12e/0x9c0 kernel/fork.c:2721 __do_sys_clone+0xd9/0x120 kernel/fork.c:2862 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd096fc5852 Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 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 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00 RSP: 002b:00007fff648d1350 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fff648d1350 RCX: 00007fd096fc5852 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007fff648d14dc R08: 0000000000000000 R09: 0000000000000001 R10: 0000555593cf87d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 0000000000105119 R15: 00007fff648d1530 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 14692 Comm: syz.4.2056 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] RIP: 0010:lock_is_held_type+0xc1/0x140 kernel/locking/lockdep.c:5941 Code: f7 e8 a3 fe ff ff 85 c0 74 e0 41 83 fc ff 74 13 31 c0 41 f6 46 22 03 0f 95 c0 44 39 e0 0f 94 c0 0f b6 c0 48 c7 c7 05 99 ef 8d <89> 44 24 04 e8 56 17 00 00 ba ff ff ff ff 65 0f c1 15 f1 f5 81 08 RSP: 0018:ffffc90000007e00 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffff8880b84284d8 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffff8880b84284d8 RDI: ffffffff8def9905 RBP: ffff88803273dc40 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 00000000ffffffff R13: 0000000000000046 R14: ffff88803273e820 R15: 0000000000000002 FS: 00007f94a969a6c0(0000) GS:ffff888124373000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdff91ac368 CR3: 0000000098ff8000 CR4: 0000000000350ef0 Call Trace: lock_is_held include/linux/lockdep.h:249 [inline] __remove_hrtimer+0x374/0x440 kernel/time/hrtimer.c:1145 __run_hrtimer kernel/time/hrtimer.c:1910 [inline] __hrtimer_run_queues+0x359/0xa00 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_release+0x19e/0x310 kernel/locking/lockdep.c:5893 Code: ff 65 0f c1 05 5b ae 26 12 83 f8 01 0f 85 28 01 00 00 9c 58 f6 c4 02 0f 85 13 01 00 00 41 f7 c6 00 02 00 00 0f 85 c0 00 00 00 <48> 8b 44 24 10 65 48 2b 05 ad 66 26 12 0f 85 4e 01 00 00 48 83 c4 RSP: 0018:ffffc900044ff118 EFLAGS: 00000206 RAX: 0000000000000046 RBX: ffffffff8e7e54e0 RCX: ffffc900044ff124 RDX: 0000000000000002 RSI: ffffffff8def9905 RDI: ffffffff8c1c3800 RBP: ffffffff81b7b1ae R08: 0000000000000001 R09: 0000000000000007 R10: 0000000000000200 R11: 0000000000017fd5 R12: ffff88803273dc40 R13: ffffc900044ff1d0 R14: 0000000000000202 R15: 0000000000000003 rcu_lock_release include/linux/rcupdate.h:310 [inline] rcu_read_unlock include/linux/rcupdate.h:869 [inline] class_rcu_destructor include/linux/rcupdate.h:1181 [inline] unwind_next_frame+0x3c3/0x2090 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x162/0x1e0 mm/page_owner.c:165 __set_page_owner+0x8c/0x540 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x153/0x170 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0x11a6/0x33b0 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x27c/0x2bc0 mm/page_alloc.c:5226 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1933 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1975 shmem_get_folio_gfp+0x6ab/0x1900 mm/shmem.c:2564 shmem_get_folio mm/shmem.c:2670 [inline] shmem_fallocate+0x6d7/0x1060 mm/shmem.c:3766 vfs_fallocate+0x576/0x10d0 fs/open.c:338 ksys_fallocate fs/open.c:362 [inline] __do_sys_fallocate fs/open.c:367 [inline] __se_sys_fallocate fs/open.c:365 [inline] __x64_sys_fallocate+0xd5/0x140 fs/open.c:365 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f94a879cdd9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f94a969a028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f94a8a15fa0 RCX: 00007f94a879cdd9 RDX: 00000000000063db RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f94a8832d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000007000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f94a8a16038 R14: 00007f94a8a15fa0 R15: 00007ffcd27b0478