watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.0.5455:25089] Modules linked in: irq event stamp: 362052 hardirqs last enabled at (362051): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:526 [inline] hardirqs last enabled at (362051): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:561 [inline] hardirqs last enabled at (362051): [] irqentry_exit+0x2c9/0xa90 kernel/entry/common.c:167 hardirqs last disabled at (362052): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (362050): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last enabled at (362050): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last enabled at (362050): [] __irq_exit_rcu+0x16a/0x210 kernel/softirq.c:758 softirqs last disabled at (362019): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last disabled at (362019): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last disabled at (362019): [] __irq_exit_rcu+0x16a/0x210 kernel/softirq.c:758 CPU: 0 UID: 0 PID: 25089 Comm: syz.0.5455 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline] RIP: 0010:csd_lock kernel/smp.c:396 [inline] RIP: 0010:smp_call_function_many_cond+0x57c/0x18c0 kernel/smp.c:944 Code: 00 00 00 00 00 fc ff df 48 89 ea 49 89 ec 48 c1 ea 03 41 83 e4 07 4c 8d 2c 02 41 83 c4 03 e8 cb cc 0c 00 f3 90 41 0f b6 45 00 <41> 38 c4 7c 08 84 c0 0f 85 51 11 00 00 44 8b 73 08 31 ff 41 83 e6 RSP: 0018:ffffc900067df5f8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8341a40 RCX: 0000000000000001 RDX: ffff88802b983e80 RSI: ffffffff81ff7565 RDI: ffff88802b983e80 RBP: ffff8880b8341a48 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000003 R13: ffffed1017068349 R14: 0000000000000001 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888122940000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562fdecc2000 CR3: 0000000028d4c000 CR4: 0000000000350ef0 Call Trace: __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+0x3c9/0x1370 arch/x86/mm/tlb.c:1435 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:499 [inline] tlb_flush_mmu mm/mmu_gather.c:423 [inline] tlb_finish_mmu+0x3fe/0x810 mm/mmu_gather.c:549 exit_mmap+0x454/0xa00 mm/mmap.c:1328 __mmput+0x12a/0x410 kernel/fork.c:1193 mmput+0x67/0x80 kernel/fork.c:1216 exit_mm kernel/exit.c:592 [inline] do_exit+0x83b/0x2a40 kernel/exit.c:974 do_group_exit+0xd5/0x2a0 kernel/exit.c:1130 get_signal+0x1ec7/0x21e0 kernel/signal.c:3112 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x139/0x700 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f830f39f559 Code: Unable to access opcode bytes at 0x7f830f39f52f. RSP: 002b:00007f83102ac0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f830f625fa8 RCX: 00007f830f39f559 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f830f625fa8 RBP: 00007f830f625fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f830f626038 R14: 00007ffd5c27c6e0 R15: 00007ffd5c27c7c8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:2040 [inline] RIP: 0010:__hrtimer_run_queues+0x2a5/0x9c0 kernel/time/hrtimer.c:2131 Code: 8b 6c 24 40 4c 8b 7c 24 18 48 89 ee 4c 89 ff e8 d1 94 14 00 49 39 ef 0f 8c fa 04 00 00 e8 e3 9a 14 00 48 8b 44 24 38 0f b6 10 <48> c7 c0 e4 f0 45 92 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 08 RSP: 0018:ffffc90000a08e90 EFLAGS: 00000046 RAX: fffffbfff248be1c RBX: dffffc0000000000 RCX: 0000000001000002 RDX: 0000000000000000 RSI: ffffffff81f7a74d RDI: ffff8880202b0000 RBP: 18e0775529487f80 R08: 0000000000000006 R09: 18e23167a3b942b0 R10: 18e0775529487f80 R11: 0000000000000000 R12: ffff888052c5e300 R13: 0000000000000001 R14: ffff8880b8328740 R15: 18e23167a3b942b0 FS: 0000000000000000(0000) GS:ffff888122a40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2e2066 CR3: 000000003e29a000 CR4: 0000000000350ef0 Call Trace: hrtimer_interrupt+0x441/0xaa0 kernel/time/hrtimer.c:2250 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline] __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64 Code: 77 96 02 e9 7e b9 3b f5 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 18 17 00 fb f4 57 b9 3b f5 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000197e00 EFLAGS: 00000242 RAX: 000000000082d9ef RBX: ffff8880202b0000 RCX: ffffffff8bd4a2f5 RDX: 0000000000000001 RSI: ffffffff8e3e4386 RDI: ffffffff8c626380 RBP: ffffed1004056000 R08: 0000000000000001 R09: ffffed10170667bd R10: ffff8880b8333deb R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 1ffff92000032fc4 R15: dffffc0000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:768 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x3ae/0x5b0 kernel/sched/idle.c:355 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x158