================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.3.17237/25807 [HC2[2]:SC0[0]:HE0:SE1] takes: ffff8880433d2ca0 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 {INITIAL USE} state was registered at: lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 htab_lru_map_update_elem+0x2c6/0x990 kernel/bpf/hashtab.c:1259 bpf_map_update_value+0x660/0x720 kernel/bpf/syscall.c:203 map_update_elem+0x57b/0x700 kernel/bpf/syscall.c:1567 __sys_bpf+0x6b5/0x890 kernel/bpf/syscall.c:5465 __do_sys_bpf kernel/bpf/syscall.c:5581 [inline] __se_sys_bpf kernel/bpf/syscall.c:5579 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5579 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 6492 hardirqs last enabled at (6491): [] exc_debug_user arch/x86/kernel/traps.c:1192 [inline] hardirqs last enabled at (6491): [] noist_exc_debug+0xf2/0x120 arch/x86/kernel/traps.c:1205 hardirqs last disabled at (6492): [] irqentry_enter+0x13/0x50 kernel/entry/common.c:327 softirqs last enabled at (6324): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last enabled at (6324): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last enabled at (6324): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 softirqs last disabled at (6265): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last disabled at (6265): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last disabled at (6265): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 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.3.17237/25807: #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: __perf_event_output kernel/events/core.c:7972 [inline] #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: perf_event_output_forward+0xb9/0x3e0 kernel/events/core.c:7995 stack backtrace: CPU: 1 PID: 25807 Comm: syz.3.17237 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: <#DB> dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 lock_acquire+0x2c2/0x420 kernel/locking/lockdep.c:5745 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 htab_lru_map_delete_elem+0x1a4/0x650 kernel/bpf/hashtab.c:1485 bpf_prog_69bf374aa003a95d+0x46/0x4a bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline] __bpf_prog_run include/linux/filter.h:616 [inline] bpf_prog_run include/linux/filter.h:623 [inline] bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584 __perf_event_overflow+0x447/0x630 kernel/events/core.c:9720 perf_swevent_overflow kernel/events/core.c:9803 [inline] perf_swevent_event+0x319/0x570 kernel/events/core.c:9854 perf_bp_event+0x319/0x430 kernel/events/core.c:10781 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x23e/0x670 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain+0x197/0x380 kernel/notifier.c:93 atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:231 notify_die+0x145/0x1a0 kernel/notifier.c:596 notify_debug+0x2e/0x50 arch/x86/kernel/traps.c:1042 exc_debug_kernel arch/x86/kernel/traps.c:1099 [inline] exc_debug+0xde/0x140 arch/x86/kernel/traps.c:1199 asm_exc_debug+0x1e/0x40 arch/x86/include/asm/idtentry.h:644 RIP: 0010:__get_user_nocheck_8+0xd/0x20 arch/x86/lib/getuser.S:143 Code: fa 0f 01 cb 0f ae e8 8b 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 01 cb 0f ae e8 48 8b 10 <31> c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 ca RSP: 0000:ffffc900050d7638 EFLAGS: 00040806 RAX: 0000200000000300 RBX: 00000000ffffffff RCX: 1ffff92000a1aee6 RDX: 00006370692f736e RSI: 0000200000000300 RDI: 0000000000000000 RBP: 0000200000000300 R08: 000000000000007f R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff22388a1 R12: 0000000000000001 R13: 1ffff92000a1aee4 R14: 000000000000007f R15: dffffc0000000000 perf_callchain_user+0xbe4/0x15c0 arch/x86/events/core.c:2957 get_perf_callchain+0x394/0x510 kernel/events/callchain.c:219 perf_callchain kernel/events/core.c:7742 [inline] perf_sample_save_callchain include/linux/perf_event.h:1232 [inline] perf_prepare_sample+0x3c7/0x1df0 kernel/events/core.c:7786 __perf_event_output kernel/events/core.c:7974 [inline] perf_event_output_forward+0x187/0x3e0 kernel/events/core.c:7995 __perf_event_overflow+0x447/0x630 kernel/events/core.c:9720 perf_event_overflow kernel/events/core.c:9741 [inline] perf_swevent_hrtimer+0x439/0x610 kernel/events/core.c:11230 __run_hrtimer kernel/time/hrtimer.c:1750 [inline] __hrtimer_run_queues+0x4e1/0xc40 kernel/time/hrtimer.c:1814 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline] __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0033:0x7f9046f7b5bd 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:00007f9047dc58a8 EFLAGS: 00000283 RAX: 0000000000000300 RBX: 00007f9047dc5de0 RCX: 2f666c65732f636f RDX: 0000200000000300 RSI: 00007f904705cdc0 RDI: 0000200000000300 RBP: 0000200000000300 R08: 00007f9047dc6010 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000073 R14: 00007f9047031f5b R15: 00007f9047dc5ea0 ---------------- Code disassembly (best guess): 0: fa cli 1: 0f 01 cb stac 4: 0f ae e8 lfence 7: 8b 10 mov (%rax),%edx 9: 31 c0 xor %eax,%eax b: 0f 01 ca clac e: c3 ret f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: f3 0f 1e fa endbr64 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: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 0f 01 ca clac