================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.2060/10500 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff8880240b7aa0 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] ffff8880240b7aa0 (&htab->lockdep_key){....}-{2:2}, at: htab_map_delete_elem+0x1b2/0x520 kernel/bpf/hashtab.c:1361 {INITIAL USE} state was registered at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] htab_map_update_elem+0x225/0xa40 kernel/bpf/hashtab.c:1082 bpf_map_update_value+0x57d/0x650 kernel/bpf/syscall.c:223 map_update_elem+0x626/0x770 kernel/bpf/syscall.c:1194 __sys_bpf+0x46b/0x6f0 kernel/bpf/syscall.c:4645 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 irq event stamp: 960 hardirqs last enabled at (959): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 hardirqs last disabled at (960): [] exc_debug_user arch/x86/kernel/traps.c:972 [inline] hardirqs last disabled at (960): [] noist_exc_debug+0x49/0x120 arch/x86/kernel/traps.c:1035 softirqs last enabled at (798): [] bpf_prog_load+0x10f9/0x1510 kernel/bpf/syscall.c:2380 softirqs last disabled at (796): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (796): [] bpf_ksym_add+0x29/0x340 kernel/bpf/core.c:633 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->lockdep_key); lock(&htab->lockdep_key); *** DEADLOCK *** 2 locks held by syz.0.2060/10500: #0: ffff88805acb6068 (&p->vtime.seqcount){....}-{0:0}, at: __context_tracking_exit+0x4c/0x80 kernel/context_tracking.c:160 #1: ffffffff8c31f360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:313 stack backtrace: CPU: 0 PID: 10500 Comm: syz.0.2060 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 lock_acquire+0x2c3/0x400 kernel/locking/lockdep.c:5614 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] htab_map_delete_elem+0x1b2/0x520 kernel/bpf/hashtab.c:1361 bpf_prog_2c29ac5cdc6b1842+0x3a/0xb94 bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_overflow_handler+0x1c2/0x4a0 kernel/events/core.c:10297 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 perf_bp_event+0x276/0x320 kernel/events/core.c:10484 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:83 [inline] atomic_notifier_call_chain+0x15d/0x280 kernel/notifier.c:198 notify_die+0x141/0x1a0 kernel/notifier.c:529 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:872 exc_debug_kernel arch/x86/kernel/traps.c:929 [inline] exc_debug+0xcf/0x130 arch/x86/kernel/traps.c:1029 asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:642 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:ffffc90002fef580 EFLAGS: 00040806 RAX: 0000200000000300 RBX: 0000000000000000 RCX: ffff88805acb5940 RDX: 00006370692f736e RSI: 0000200000000300 RDI: 00007fffffffeff0 RBP: 0000000000000007 R08: ffffffff8d8a06ef R09: 1ffffffff1b140dd R10: dffffc0000000000 R11: fffffbfff1b140de R12: 0000200000000300 R13: 00007fffffffeff0 R14: 00000000ffffffff R15: dffffc0000000000 perf_callchain_user+0x40e/0xfd0 arch/x86/events/core.c:2900 get_perf_callchain+0x33d/0x460 kernel/events/callchain.c:221 perf_callchain kernel/events/core.c:7606 [inline] perf_prepare_sample+0x352/0x1cd0 kernel/events/core.c:7633 __perf_event_output kernel/events/core.c:7802 [inline] perf_event_output_forward+0x185/0x2e0 kernel/events/core.c:7822 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 perf_trace_lock+0x301/0x390 include/trace/events/lock.h:39 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x84a/0x8a0 kernel/locking/lockdep.c:5634 do_write_seqcount_end include/linux/seqlock.h:565 [inline] vtime_user_exit+0x2c8/0x3e0 kernel/sched/cputime.c:732 __context_tracking_exit+0x4c/0x80 kernel/context_tracking.c:160 user_exit_irqoff include/linux/context_tracking.h:47 [inline] __enter_from_user_mode kernel/entry/common.c:22 [inline] irqentry_enter_from_user_mode+0x22/0x40 kernel/entry/common.c:314 exc_debug_user arch/x86/kernel/traps.c:972 [inline] noist_exc_debug+0x49/0x120 arch/x86/kernel/traps.c:1035 asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:642 RIP: 0033:0x7f074628dbfd 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:00007f07445078a8 EFLAGS: 00000283 RAX: 0000000000000300 RBX: 00007f0744507de0 RCX: 2f666c65732f636f RDX: 0000200000000300 RSI: 00007f074636f140 RDI: 0000200000000300 RBP: 0000200000000300 R08: 00007f0744508010 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000073 R14: 00007f07463440dd R15: 00007f0744507ea0 ---------------- 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