================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.9.14336/18879 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff8880464d1a18 (&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:5678 __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_map_delete_elem+0x197/0x5c0 kernel/bpf/hashtab.c:1396 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:608 [inline] bpf_prog_run include/linux/filter.h:615 [inline] bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10331 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9506 perf_swevent_overflow+0x19b/0x230 kernel/events/core.c:9589 perf_swevent_event+0x458/0x570 kernel/events/core.c:-1 perf_bp_event+0x311/0x3f0 kernel/events/core.c:10528 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x14d/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_user arch/x86/kernel/traps.c:1144 [inline] noist_exc_debug+0x73/0x120 arch/x86/kernel/traps.c:1181 asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:648 irq event stamp: 1034 hardirqs last enabled at (1033): [] exc_debug_kernel arch/x86/kernel/traps.c:1093 [inline] hardirqs last enabled at (1033): [] exc_debug+0xf0/0x130 arch/x86/kernel/traps.c:1175 hardirqs last disabled at (1034): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (1034): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (898): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (898): [] btf_alloc_id+0x91/0x2d0 kernel/bpf/btf.c:1586 softirqs last disabled at (890): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (890): [] btf_alloc_id+0x30/0x2d0 kernel/bpf/btf.c:1582 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.9.14336/18879. stack backtrace: CPU: 0 PID: 18879 Comm: syz.9.14336 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:5669 __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_map_delete_elem+0x197/0x5c0 kernel/bpf/hashtab.c:1396 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:608 [inline] bpf_prog_run include/linux/filter.h:615 [inline] bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10331 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9506 perf_swevent_overflow+0x19b/0x230 kernel/events/core.c:9589 perf_swevent_event+0x458/0x570 kernel/events/core.c:-1 perf_bp_event+0x311/0x3f0 kernel/events/core.c:10528 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x14d/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:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166 Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003967288 EFLAGS: 00050206 RAX: ffffffff84164701 RBX: 0000000000000062 RCX: 0000000000000049 RDX: 0000000000000062 RSI: ffff888046e94685 RDI: 0000200000000302 RBP: 0000000000000000 R08: ffff888046e946cd R09: 1ffff11008dd28d9 R10: dffffc0000000000 R11: ffffed1008dd28da R12: 00007fffffffef9e R13: 0000000000000062 R14: 00002000000002e9 R15: ffff888046e9466c 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+0xea/0x130 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:169 [inline] bpf_verifier_vlog+0x172/0x3a0 kernel/bpf/log.c:34 verbose+0x1f0/0x2b0 kernel/bpf/verifier.c:303 print_verification_stats kernel/bpf/verifier.c:15049 [inline] bpf_check+0xa0a1/0x11010 kernel/bpf/verifier.c:15661 bpf_prog_load+0x100e/0x1530 kernel/bpf/syscall.c:2651 __sys_bpf+0x5b8/0x780 kernel/bpf/syscall.c:5032 __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 RIP: 0033:0x7f709959e159 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:00007f70977f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f7099825fa0 RCX: 00007f709959e159 RDX: 000000000000006d RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f709963506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7099826038 R14: 00007f7099825fa0 R15: 00007fff28c74ca8 ---------------- Code disassembly (best guess): 0: ff c9 dec %ecx 2: 75 f2 jne 0xfffffff6 4: 89 d1 mov %edx,%ecx 6: c1 e9 03 shr $0x3,%ecx 9: 83 e2 07 and $0x7,%edx c: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) f: 89 d1 mov %edx,%ecx 11: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 13: 31 c0 xor %eax,%eax 15: 0f 01 ca clac 18: c3 ret 19: 8d 0c ca lea (%rdx,%rcx,8),%ecx 1c: 89 ca mov %ecx,%edx 1e: eb 20 jmp 0x40 20: 0f 01 cb stac 23: 83 fa 40 cmp $0x40,%edx 26: 72 38 jb 0x60 28: 89 d1 mov %edx,%ecx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 31 c0 xor %eax,%eax 2e: 0f 01 ca clac 31: c3 ret 32: 89 ca mov %ecx,%edx 34: eb 0a jmp 0x40 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop