watchdog: BUG: soft lockup - CPU#0 stuck for 113s! [syz.1.451:7926] Modules linked in: irq event stamp: 321319 hardirqs last enabled at (321318): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] hardirqs last enabled at (321318): [] _raw_spin_unlock_irqrestore+0x30/0x80 kernel/locking/spinlock.c:221 hardirqs last disabled at (321319): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (316428): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (316428): [] fpregs_lock arch/x86/include/asm/fpu/api.h:69 [inline] softirqs last enabled at (316428): [] fpu_clone+0x340/0xaf0 arch/x86/kernel/fpu/core.c:710 softirqs last disabled at (316725): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last disabled at (316725): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last disabled at (316725): [] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 CPU: 0 UID: 0 PID: 7926 Comm: syz.1.451 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:kasan_byte_accessible+0x18/0x30 mm/kasan/generic.c:212 Code: 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 0f b6 04 07 3c 08 <0f> 92 c0 c3 cc cc cc cc cc 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 RSP: 0000:ffffc90000007908 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffffff81d45035 RCX: 0000000000000102 RDX: 0000000000000004 RSI: ffffffff81d45035 RDI: 1ffffffff1fab914 RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000000 R10: 723e2d7665646e26 R11: 2972656d69745f73 R12: ffffffff8fd5c8a0 R13: 0000000000000002 R14: ffffffff8fd5c8a0 R15: 0000000000000000 FS: 00007fdd5f7cd6c0(0000) GS:ffff888123ac0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555563f147e0 CR3: 000000007a21a000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000008d24 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __kasan_check_byte+0x12/0x40 mm/kasan/common.c:584 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x7d/0x350 kernel/locking/lockdep.c:5916 rcu_lock_acquire include/linux/rcupdate.h:309 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] trace_call_bpf+0xd5/0xb80 kernel/trace/bpf_trace.c:-1 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11440 do_perf_trace_lock include/trace/events/lock.h:49 [inline] perf_trace_lock+0x32e/0x410 include/trace/events/lock.h:49 __do_trace_lock_release include/trace/events/lock.h:68 [inline] trace_lock_release include/trace/events/lock.h:68 [inline] lock_release+0x396/0x3c0 kernel/locking/lockdep.c:5954 call_timer_fn+0x227/0x5f0 kernel/time/timer.c:1751 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:kasan_check_byte include/linux/kasan.h:402 [inline] RIP: 0010:lock_acquire+0x75/0x350 kernel/locking/lockdep.c:5916 Code: a3 05 27 04 d7 0f 73 0d e8 f8 34 09 00 84 c0 0f 84 e2 01 00 00 83 3d 19 35 d7 0f 00 0f 84 e9 00 00 00 48 8b b4 24 88 00 00 00 <4c> 89 e7 e8 03 5d 95 00 83 3d fc 34 d7 0f 00 0f 84 e4 00 00 00 65 RSP: 0000:ffffc9000324ef88 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 8000000000000001 RDX: 0000000000000000 RSI: ffffffff817811fc RDI: ffffffff8c6dd820 RBP: 1ffff92000649e20 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc9000324ede0 R11: ffffffff81b2c450 R12: ffffffff8fd5c8a0 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:309 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] class_rcu_constructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3181 [inline] call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3301 slab_free_hook mm/slub.c:2712 [inline] slab_free mm/slub.c:6509 [inline] kmem_cache_free+0x471/0x650 mm/slub.c:6636 anon_vma_free mm/rmap.c:137 [inline] __put_anon_vma+0x12b/0x2d0 mm/rmap.c:2974 put_anon_vma mm/internal.h:290 [inline] unlink_anon_vmas+0x544/0x720 mm/rmap.c:540 free_pgtables+0x663/0xb70 mm/memory.c:401 exit_mmap+0x4aa/0x9f0 mm/mmap.c:1327 __mmput+0x118/0x420 kernel/fork.c:1193 copy_process+0x2f5f/0x4400 kernel/fork.c:2609 kernel_clone+0x2d7/0x940 kernel/fork.c:2771 __do_sys_clone kernel/fork.c:2913 [inline] __se_sys_clone kernel/fork.c:2897 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2897 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdd5e99e1d9 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:00007fdd5f7ccfd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fdd5ec26090 RCX: 00007fdd5e99e1d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020102400 RBP: 00007fdd5ea35888 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007fdd5ec26128 R14: 00007fdd5ec26090 R15: 00007ffe4f134c08 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7822 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:check_kcov_mode kernel/kcov.c:190 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x4f/0x80 kernel/kcov.c:213 Code: 01 00 0f 81 fe 00 01 00 00 40 0f 95 c6 81 fa 00 00 00 10 0f 93 c2 40 08 f2 75 35 83 b9 44 17 00 00 00 74 2c 8b 91 18 17 00 00 <83> fa 02 75 21 48 8b 91 20 17 00 00 48 8b 32 48 8d 7e 01 8b 89 1c RSP: 0000:ffffc900046af718 EFLAGS: 00000246 RAX: ffffffff81bbc688 RBX: ffff8880b8443708 RCX: ffff88802ba30000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900046af870 R08: ffffffff917a6b7f R09: 1ffffffff22f4d6f R10: dffffc0000000000 R11: fffffbfff22f4d70 R12: 1ffff110170886e1 R13: dffffc0000000000 R14: 1ffff110057462b3 R15: 0000000000000000 FS: 00007f810459f880(0000) GS:ffff888123bc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055fc388e1f28 CR3: 000000003419e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000008d24 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:363 [inline] smp_call_function_many_cond+0x1148/0x1500 kernel/smp.c:1002 __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+0x8ff/0x1090 arch/x86/mm/tlb.c:1435 flush_tlb_page arch/x86/include/asm/tlbflush.h:352 [inline] ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:104 wp_page_copy mm/memory.c:4073 [inline] do_wp_page+0x3c5c/0x4b80 mm/memory.c:4472 handle_pte_fault mm/memory.c:6582 [inline] __handle_mm_fault mm/memory.c:6707 [inline] handle_mm_fault+0x15d7/0x3750 mm/memory.c:6876 do_user_addr_fault+0xa4f/0x1340 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f8103eb5b69 Code: 10 48 81 f9 ff 03 00 00 76 28 48 8b 57 20 48 85 d2 74 1f 48 3b 7a 28 75 76 48 8b 4f 28 48 3b 79 20 75 6c 48 83 78 20 00 74 17 <48> 89 4a 28 48 89 51 20 48 83 c4 08 c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffeab5c9b00 EFLAGS: 00010206 RAX: 00007f8103ff21f0 RBX: 00000000000027c0 RCX: 000055fc388e1f00 RDX: 000055fc388e1f00 RSI: 00007f8103ff21f0 RDI: 000055fc388e1f00 RBP: 00007f8103ff1ac0 R08: 00000000000027c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 000055fc388df770 R13: 00007f8103ff1ac0 R14: 00000000000027c0 R15: 00007f8103ff1ac0