================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.8.6678/683 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888058ef5d20 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] ffff888058ef5d20 (&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_delete_elem+0x1b2/0x520 kernel/bpf/hashtab.c:1361 bpf_prog_2c29ac5cdc6b1842+0x3a/0x4f4 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_user arch/x86/kernel/traps.c:998 [inline] noist_exc_debug+0x73/0x120 arch/x86/kernel/traps.c:1035 asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:642 irq event stamp: 962 hardirqs last enabled at (961): [] seqcount_lockdep_reader_access+0x127/0x1d0 include/linux/seqlock.h:105 hardirqs last disabled at (962): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (962): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (888): [] spin_unlock_bh include/linux/spinlock.h:409 [inline] softirqs last enabled at (888): [] btf_alloc_id+0x8f/0x180 kernel/bpf/btf.c:1481 softirqs last disabled at (880): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (880): [] btf_alloc_id+0x2e/0x180 kernel/bpf/btf.c:1477 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->lockdep_key); lock(&htab->lockdep_key); *** DEADLOCK *** no locks held by syz.8.6678/683. stack backtrace: CPU: 0 PID: 683 Comm: syz.8.6678 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 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/0x4f4 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:copy_user_generic_unrolled+0x8c/0xc0 arch/x86/lib/copy_user_64.S:93 Code: 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 <48> 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 88 07 RSP: 0018:ffffc90002eff478 EFLAGS: 00040207 RAX: ffffffff83e3be01 RBX: 000000000000001c RCX: 0000000000000003 RDX: 0000000000000004 RSI: ffff8880728d466c RDI: 00002000000002fc RBP: 0000000000000000 R08: 6163696669726576 R09: 1ffff1100e51a8d0 R10: dffffc0000000000 R11: ffffed100e51a8d1 R12: 00007ffffffff000 R13: 0000200000000318 R14: ffff8880728d466c R15: 00002000000002fc copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] _copy_to_user+0xf0/0x130 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:200 [inline] bpf_verifier_vlog+0x1b5/0x350 kernel/bpf/verifier.c:303 verbose+0x1f2/0x2b0 kernel/bpf/verifier.c:348 print_verification_stats kernel/bpf/verifier.c:13581 [inline] bpf_check+0x87a7/0xf270 kernel/bpf/verifier.c:14184 bpf_prog_load+0xfec/0x1510 kernel/bpf/syscall.c:2354 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657 __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 RIP: 0033:0x7f4059e9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f40580f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f405a115fa0 RCX: 00007f4059e9aeb9 RDX: 0000000000000080 RSI: 0000200000000500 RDI: 0000000000000005 RBP: 00007f4059f08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f405a116038 R14: 00007f405a115fa0 R15: 00007fff9e9fe968 ---------------- Code disassembly (best guess): 0: 47 20 4c 89 4f and %r9b,0x4f(%r9,%r9,4) 5: 28 4c 89 57 sub %cl,0x57(%rcx,%rcx,4) 9: 30 4c 89 5f xor %cl,0x5f(%rcx,%rcx,4) d: 38 48 8d cmp %cl,-0x73(%rax) 10: 76 40 jbe 0x52 12: 48 8d 7f 40 lea 0x40(%rdi),%rdi 16: ff c9 dec %ecx 18: 75 b6 jne 0xffffffd0 1a: 89 d1 mov %edx,%ecx 1c: 83 e2 07 and $0x7,%edx 1f: c1 e9 03 shr $0x3,%ecx 22: 74 12 je 0x36 24: 4c 8b 06 mov (%rsi),%r8 27: 4c 89 07 mov %r8,(%rdi) * 2a: 48 8d 76 08 lea 0x8(%rsi),%rsi <-- trapping instruction 2e: 48 8d 7f 08 lea 0x8(%rdi),%rdi 32: ff c9 dec %ecx 34: 75 ee jne 0x24 36: 21 d2 and %edx,%edx 38: 74 10 je 0x4a 3a: 89 d1 mov %edx,%ecx 3c: 8a 06 mov (%rsi),%al 3e: 88 07 mov %al,(%rdi)