================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.3.1086/8086 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88801f693620 (&htab->lockdep_key#2){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] ffff88801f693620 (&htab->lockdep_key#2){....}-{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/0x64 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: 1338 hardirqs last enabled at (1337): [] syscall_enter_from_user_mode+0x21/0x70 kernel/entry/common.c:113 hardirqs last disabled at (1338): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (1338): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (1306): [] spin_unlock_bh include/linux/spinlock.h:409 [inline] softirqs last enabled at (1306): [] bpf_map_alloc_id+0x8f/0x180 kernel/bpf/syscall.c:379 softirqs last disabled at (1304): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (1304): [] bpf_map_alloc_id+0x2e/0x180 kernel/bpf/syscall.c:375 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->lockdep_key#2); lock(&htab->lockdep_key#2); *** DEADLOCK *** no locks held by syz.3.1086/8086. stack backtrace: CPU: 0 PID: 8086 Comm: syz.3.1086 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/0x64 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:has_zero arch/x86/include/asm/word-at-a-time.h:49 [inline] RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:54 [inline] RIP: 0010:strncpy_from_user+0x167/0x360 lib/strncpy_from_user.c:139 Code: 5f da 75 fd 49 83 fc 07 0f 86 a1 00 00 00 4c 89 74 24 08 48 c7 44 24 10 f8 ff ff ff 45 31 ed 4c 89 3c 24 48 89 dd 4f 8b 3c 2f <48> b8 ff fe fe fe fe fe fe fe 49 8d 1c 07 4d 89 fe 49 f7 d6 48 b8 RSP: 0018:ffffc9000317fb90 EFLAGS: 00040246 RAX: ffffffff84034921 RBX: ffffc9000317fcb0 RCX: ffff88802cea5940 RDX: 0000000000000002 RSI: 000000000000007f RDI: 0000000000000007 RBP: ffffc9000317fcb0 R08: ffff88802cea5940 R09: 0000000000000003 R10: 0000000000000002 R11: 0000000000000002 R12: 000000000000007f R13: 0000000000000000 R14: 000000000000007f R15: 00006370004c5047 strncpy_from_bpfptr include/linux/bpfptr.h:84 [inline] bpf_prog_load+0x1f0/0x1510 kernel/bpf/syscall.c:2239 __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: 0033:0x7f6ac68beeb9 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:00007f6ac4b1a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6ac6b39fa0 RCX: 00007f6ac68beeb9 RDX: 0000000000000023 RSI: 0000200000000400 RDI: 0000000000000005 RBP: 00007f6ac692cc1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6ac6b3a038 R14: 00007f6ac6b39fa0 R15: 00007ffc180187e8 ---------------- Code disassembly (best guess): 0: 5f pop %rdi 1: da 75 fd fidivl -0x3(%rbp) 4: 49 83 fc 07 cmp $0x7,%r12 8: 0f 86 a1 00 00 00 jbe 0xaf e: 4c 89 74 24 08 mov %r14,0x8(%rsp) 13: 48 c7 44 24 10 f8 ff movq $0xfffffffffffffff8,0x10(%rsp) 1a: ff ff 1c: 45 31 ed xor %r13d,%r13d 1f: 4c 89 3c 24 mov %r15,(%rsp) 23: 48 89 dd mov %rbx,%rbp 26: 4f 8b 3c 2f mov (%r15,%r13,1),%r15 * 2a: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax <-- trapping instruction 31: fe fe fe 34: 49 8d 1c 07 lea (%r15,%rax,1),%rbx 38: 4d 89 fe mov %r15,%r14 3b: 49 f7 d6 not %r14 3e: 48 rex.W 3f: b8 .byte 0xb8