watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.7.1343:10399] Modules linked in: irq event stamp: 160224 hardirqs last enabled at (160223): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:200 hardirqs last disabled at (160224): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (160222): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (160222): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (160222): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (160207): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (160207): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (160207): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 10399 Comm: syz.7.1343 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b6 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 45 5f RSP: 0018:ffffc90003dbf340 EFLAGS: 00000293 RAX: ffffffff81b4621b RBX: 1ffff110170c8341 RCX: ffff88802938da00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003dbf4c0 R08: ffffffff8fa3a937 R09: 1ffffffff1f47526 R10: dffffc0000000000 R11: fffffbfff1f47527 R12: ffff8880b8641a08 R13: dffffc0000000000 R14: ffff8880b873b1c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4ca4fd1420 CR3: 000000000df36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x6b1/0x12d0 arch/x86/mm/tlb.c:1451 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline] tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 free_ldt_pgtables+0x17b/0x320 arch/x86/kernel/ldt.c:411 arch_exit_mmap arch/x86/include/asm/mmu_context.h:234 [inline] exit_mmap+0x17c/0xb50 mm/mmap.c:1266 __mmput+0x118/0x430 kernel/fork.c:1129 exit_mm+0x1da/0x2c0 kernel/exit.c:582 do_exit+0x648/0x2300 kernel/exit.c:949 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4ca4d8ec29 Code: Unable to access opcode bytes at 0x7f4ca4d8ebff. RSP: 002b:00007f4ca5bce0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f4ca4fd5fa8 RCX: 00007f4ca4d8ec29 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4ca4fd5fa8 RBP: 00007f4ca4fd5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4ca4fd6038 R14: 00007ffed97b5000 R15: 00007ffed97b50e8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 10393 Comm: syz.3.1341 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:validate_chain+0x0/0x2140 kernel/locking/lockdep.c:3864 Code: 44 89 e6 4c 89 ff 29 f5 0f 82 91 fe ff ff eb b3 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 41 55 41 54 53 48 81 ec e0 00 00 00 49 89 cf 65 48 RSP: 0000:ffffc900042bf368 EFLAGS: 00000086 RAX: ffffffff93497888 RBX: 0000000000000000 RCX: 0ac0d5affe09d4ff RDX: 0000000000000001 RSI: ffff888032b928f0 RDI: ffff888032b91e00 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81cb18b7 R10: 61625f72656d6974 R11: 6b636f6c2e736573 R12: 0000000000004008 R13: ffff888032b928f0 R14: ffff888032b928f0 R15: 0ac0d5affe09d4ff FS: 00007f3a96fff6c0(0000) GS:ffff888125c15000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4ca4fcf510 CR3: 00000000302ba000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] trace_call_bpf+0xd4/0x850 kernel/trace/bpf_trace.c:-1 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10918 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x311/0x360 kernel/locking/lockdep.c:5831 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 lock_hrtimer_base kernel/time/hrtimer.c:171 [inline] hrtimer_try_to_cancel+0x22b/0x420 kernel/time/hrtimer.c:1362 hrtimer_cancel+0x3b/0x50 kernel/time/hrtimer.c:1488 perf_swevent_cancel_hrtimer kernel/events/core.c:11813 [inline] cpu_clock_event_stop+0xd9/0x130 kernel/events/core.c:11863 __perf_event_overflow+0x57d/0xe40 kernel/events/core.c:10333 perf_swevent_hrtimer+0x3c5/0x550 kernel/events/core.c:11769 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x4dd/0xc60 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0033:0x7f3a961185e0 Code: c7 44 24 20 c0 ff ff ff 48 c7 44 24 18 3f 00 00 00 48 c7 44 24 10 40 00 00 00 48 c7 44 24 08 00 00 00 00 e9 ad fd ff ff 66 90 <48> c7 c0 a8 ff ff ff 64 48 03 04 25 00 00 00 00 c3 66 2e 0f 1f 84 RSP: 002b:00007f3a96fff058 EFLAGS: 00000246 RAX: 00007f3a963d5fa0 RBX: 0000000000000003 RCX: 00007f3a962143d6 RDX: 000000000002fec8 RSI: 0000000000000050 RDI: 00007f3a963d6038 RBP: 00007f3a96211e41 R08: 000000002dacfe11 R09: 7fffffffffffffff R10: 3fffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3a963d6038 R14: 00007f3a963d5fa0 R15: 00007ffcdff68298