================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.3.5568/20511 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888062bd3820 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] ffff888062bd3820 (&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/0xe14 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: 1838 hardirqs last enabled at (1837): [] syscall_enter_from_user_mode+0x21/0x70 kernel/entry/common.c:113 hardirqs last disabled at (1838): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (1838): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (1512): [] bpf_prog_load+0x10f9/0x1510 kernel/bpf/syscall.c:2380 softirqs last disabled at (1510): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (1510): [] 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 *** no locks held by syz.3.5568/20511. stack backtrace: CPU: 1 PID: 20511 Comm: syz.3.5568 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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/0xe14 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:__put_user_nocheck_4+0x5/0x11 Code: 48 39 d9 73 54 0f 01 cb 66 89 01 31 c9 0f 01 ca c3 90 90 90 90 90 48 bb fd ef ff ff ff 7f 00 00 48 39 d9 73 34 0f 01 cb 89 01 <31> c9 0f 01 ca c3 90 90 90 90 90 90 48 bb f9 ef ff ff ff 7f 00 00 RSP: 0018:ffffc9000323fe80 EFLAGS: 00040297 RAX: 000000000000000a RBX: 00007fffffffeffd RCX: 0000200000000300 RDX: 0000000000000000 RSI: ffffffff8a2b3a20 RDI: ffffffff8a79f780 RBP: 000000000000000a R08: ffffffff8d89d8af R09: 1ffffffff1b13b15 R10: dffffc0000000000 R11: fffffbfff1b13b16 R12: 0000000000000000 R13: 0000200000000300 R14: 0000000000000001 R15: 0000000000000005 __sys_socketpair+0xb4/0x540 net/socket.c:1638 __do_sys_socketpair net/socket.c:1704 [inline] __se_sys_socketpair net/socket.c:1701 [inline] __x64_sys_socketpair+0x97/0xb0 net/socket.c:1701 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: 0033:0x7fec0035ecb9 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:00007febfe5ba028 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007fec005d9fa0 RCX: 00007fec0035ecb9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001 RBP: 00007fec003ccbf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000300 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fec005da038 R14: 00007fec005d9fa0 R15: 00007ffcc1a76818 ---------------- Code disassembly (best guess): 0: 48 39 d9 cmp %rbx,%rcx 3: 73 54 jae 0x59 5: 0f 01 cb stac 8: 66 89 01 mov %ax,(%rcx) b: 31 c9 xor %ecx,%ecx d: 0f 01 ca clac 10: c3 ret 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 48 bb fd ef ff ff ff movabs $0x7fffffffeffd,%rbx 1d: 7f 00 00 20: 48 39 d9 cmp %rbx,%rcx 23: 73 34 jae 0x59 25: 0f 01 cb stac 28: 89 01 mov %eax,(%rcx) * 2a: 31 c9 xor %ecx,%ecx <-- 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: 48 bb f9 ef ff ff ff movabs $0x7fffffffeff9,%rbx 3d: 7f 00 00