================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.4.23957/9167 [HC2[2]:SC0[0]:HE0:SE1] takes: ffff888077978890 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket+0x179/0x2f0 kernel/bpf/hashtab.c:166 {INITIAL USE} state was registered at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x179/0x2f0 kernel/bpf/hashtab.c:166 __htab_lru_percpu_map_update_elem+0x26e/0x970 kernel/bpf/hashtab.c:1333 bpf_percpu_hash_update+0x115/0x200 kernel/bpf/hashtab.c:2329 bpf_map_update_value+0x30f/0x670 kernel/bpf/syscall.c:202 map_update_elem+0x4fa/0x6a0 kernel/bpf/syscall.c:1473 __sys_bpf+0x4ec/0x780 kernel/bpf/syscall.c:5020 __do_sys_bpf kernel/bpf/syscall.c:5136 [inline] __se_sys_bpf kernel/bpf/syscall.c:5134 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5134 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 2682 hardirqs last enabled at (2681): [] exc_debug_user arch/x86/kernel/traps.c:1168 [inline] hardirqs last enabled at (2681): [] noist_exc_debug+0xee/0x120 arch/x86/kernel/traps.c:1181 hardirqs last disabled at (2682): [] irqentry_enter+0xf/0x50 kernel/entry/common.c:328 softirqs last enabled at (2600): [] bpf_prog_load+0x111d/0x1530 kernel/bpf/syscall.c:2677 softirqs last disabled at (2596): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (2596): [] bpf_ksym_add+0x28/0x330 kernel/bpf/core.c:649 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->lockdep_key); lock(&htab->lockdep_key); *** DEADLOCK *** 1 lock held by syz.4.23957/9167: #0: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: __perf_event_output kernel/events/core.c:7728 [inline] #0: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: perf_event_output_forward+0xbe/0x2f0 kernel/events/core.c:7750 stack backtrace: CPU: 0 PID: 9167 Comm: syz.4.23957 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lock_acquire+0x2df/0x4a0 kernel/locking/lockdep.c:5667 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x179/0x2f0 kernel/bpf/hashtab.c:166 htab_lru_map_delete_elem+0x1a1/0x760 kernel/bpf/hashtab.c:1431 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10321 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9496 perf_swevent_overflow kernel/events/core.c:9579 [inline] perf_swevent_event+0x315/0x570 kernel/events/core.c:9630 perf_bp_event+0x311/0x3f0 kernel/events/core.c:10518 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x212/0x470 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain kernel/notifier.c:87 [inline] atomic_notifier_call_chain+0x17a/0x2b0 kernel/notifier.c:225 notify_die+0x141/0x1a0 kernel/notifier.c:593 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018 exc_debug_kernel arch/x86/kernel/traps.c:1075 [inline] exc_debug+0xd9/0x130 arch/x86/kernel/traps.c:1175 asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:648 RIP: 0010:__get_user_nocheck_8+0x9/0x13 arch/x86/lib/getuser.S:160 Code: 90 0f 01 cb 0f ae e8 0f b7 10 31 c0 0f 01 ca c3 90 0f 01 cb 0f ae e8 8b 10 31 c0 0f 01 ca c3 90 90 0f 01 cb 0f ae e8 48 8b 10 <31> c0 0f 01 ca c3 90 0f 01 ca 31 d2 48 c7 c0 f2 ff ff ff c3 00 00 RSP: 0000:ffffc9000cf87540 EFLAGS: 00040802 RAX: 0000200000000300 RBX: dffffc0000000000 RCX: ffff88803ca00000 RDX: 000074656e2f736e RSI: 0000200000000300 RDI: 00007fffffffeff0 RBP: 0000000000000000 R08: 000000000000007f R09: 0000000000000000 R10: dffffc0000000000 R11: fffff520019f0f07 R12: 00000000ffffffff R13: 0000200000000300 R14: 000000000000007f R15: 00007fffffffeff0 perf_callchain_user+0x555/0x13c0 arch/x86/events/core.c:2982 get_perf_callchain+0x39e/0x490 kernel/events/callchain.c:219 perf_callchain kernel/events/core.c:7512 [inline] perf_prepare_sample+0x399/0x2020 kernel/events/core.c:7545 __perf_event_output kernel/events/core.c:7730 [inline] perf_event_output_forward+0x197/0x2f0 kernel/events/core.c:7750 bpf_overflow_handler+0x5f8/0x790 kernel/events/core.c:10329 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9496 perf_event_overflow kernel/events/core.c:9517 [inline] perf_swevent_hrtimer+0x472/0x630 kernel/events/core.c:10967 __run_hrtimer kernel/time/hrtimer.c:1751 [inline] __hrtimer_run_queues+0x4e7/0xc90 kernel/time/hrtimer.c:1815 hrtimer_interrupt+0x399/0x980 kernel/time/hrtimer.c:1877 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0033:0x7fd39937ce7d Code: 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 27 01 00 00 c5 fd 74 0f fd d7 c1 85 c0 74 5b f3 0f bc c0 e9 30 01 00 00 66 90 f3 0f bc RSP: 002b:00007fd39a21d8a8 EFLAGS: 00000283 RAX: 0000000000000300 RBX: 00007fd39a21dde0 RCX: 0000000000000000 RDX: 0000200000000300 RSI: 00007fd39945f780 RDI: 0000200000000300 RBP: 0000200000000300 R08: 00007fd39a21e010 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000073 R14: 00007fd399434392 R15: 00007fd39a21dea0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 0f 01 cb stac 4: 0f ae e8 lfence 7: 0f b7 10 movzwl (%rax),%edx a: 31 c0 xor %eax,%eax c: 0f 01 ca clac f: c3 ret 10: 90 nop 11: 0f 01 cb stac 14: 0f ae e8 lfence 17: 8b 10 mov (%rax),%edx 19: 31 c0 xor %eax,%eax 1b: 0f 01 ca clac 1e: c3 ret 1f: 90 nop 20: 90 nop 21: 0f 01 cb stac 24: 0f ae e8 lfence 27: 48 8b 10 mov (%rax),%rdx * 2a: 31 c0 xor %eax,%eax <-- trapping instruction 2c: 0f 01 ca clac 2f: c3 ret 30: 90 nop 31: 0f 01 ca clac 34: 31 d2 xor %edx,%edx 36: 48 c7 c0 f2 ff ff ff mov $0xfffffffffffffff2,%rax 3d: c3 ret