================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.3474/17461 [HC2[2]:SC0[0]:HE0:SE1] takes: ffff88805278ffa0 (&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:5662 __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_update_elem+0x31e/0xe80 kernel/bpf/hashtab.c:1214 bpf_map_update_value+0x59e/0x670 kernel/bpf/syscall.c:228 map_update_elem+0x4d7/0x680 kernel/bpf/syscall.c:1473 __sys_bpf+0x4ec/0x780 kernel/bpf/syscall.c:5019 __do_sys_bpf kernel/bpf/syscall.c:5135 [inline] __se_sys_bpf kernel/bpf/syscall.c:5133 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133 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: 11584 hardirqs last enabled at (11583): [] exc_debug_user arch/x86/kernel/traps.c:1168 [inline] hardirqs last enabled at (11583): [] noist_exc_debug+0xee/0x120 arch/x86/kernel/traps.c:1181 hardirqs last disabled at (11584): [] irqentry_enter+0xf/0x50 kernel/entry/common.c:328 softirqs last enabled at (11578): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last enabled at (11578): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last enabled at (11578): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 softirqs last disabled at (11411): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last disabled at (11411): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last disabled at (11411): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 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.0.3474/17461: #0: ffffffff8cb2d5e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8cb2d5e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8cb2d5e0 (rcu_read_lock){....}-{1:2}, at: __perf_event_output kernel/events/core.c:7728 [inline] #0: ffffffff8cb2d5e0 (rcu_read_lock){....}-{1:2}, at: perf_event_output_forward+0xbe/0x2f0 kernel/events/core.c:7750 stack backtrace: CPU: 0 PID: 17461 Comm: syz.0.3474 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lock_acquire+0x2df/0x4a0 kernel/locking/lockdep.c:5653 __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+0x1ad/0x780 kernel/bpf/hashtab.c:1438 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x6e8/0x7c0 kernel/events/core.c:10321 __perf_event_overflow+0x448/0x610 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+0x312/0x3f0 kernel/events/core.c:10518 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x152/0x470 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:ffffc90005587540 EFLAGS: 00040802 RAX: 0000200000000300 RBX: dffffc0000000000 RCX: ffff88802a8c1dc0 RDX: 00006370692f736e RSI: 0000200000000300 RDI: 00007fffffffeff0 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff52000ab0f07 R12: 00000000ffffffff R13: 0000200000000300 R14: 0000000000000003 R15: 00007fffffffeff0 perf_callchain_user+0x55d/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+0x60f/0x7c0 kernel/events/core.c:10329 __perf_event_overflow+0x448/0x610 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:1747 [inline] __hrtimer_run_queues+0x50b/0xd50 kernel/time/hrtimer.c:1811 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873 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: 0033:0x7fefb917b5bd 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:00007fefba01a8a8 EFLAGS: 00000283 RAX: 0000000000000300 RBX: 00007fefba01ade0 RCX: 2f666c65732f636f RDX: 0000200000000300 RSI: 00007fefb925cdc0 RDI: 0000200000000300 RBP: 0000200000000300 R08: 00007fefba01b010 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000073 R14: 00007fefb9231f5b R15: 00007fefba01aea0 ---------------- 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