================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.5273/24439 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88813fe24220 (&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:5662 __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_lru_map_update_elem+0x31e/0xe80 kernel/bpf/hashtab.c:1214 bpf_map_update_value+0x59e/0x670 kernel/bpf/syscall.c:228 map_update_elem+0x4d7/0x680 kernel/bpf/syscall.c:1473 __sys_bpf+0x4ec/0x780 kernel/bpf/syscall.c:5018 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 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 irq event stamp: 878 hardirqs last enabled at (877): [] syscall_enter_from_user_mode+0x21/0x80 kernel/entry/common.c:117 hardirqs last disabled at (878): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (878): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (856): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (856): [] bpf_map_alloc_id+0x87/0xd0 kernel/bpf/syscall.c:386 softirqs last disabled at (854): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (854): [] bpf_map_alloc_id+0x21/0xd0 kernel/bpf/syscall.c:382 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.0.5273/24439. stack backtrace: CPU: 1 PID: 24439 Comm: syz.0.5273 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: <#DB> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lock_acquire+0x2df/0x4a0 kernel/locking/lockdep.c:5653 __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_lru_map_delete_elem+0x1ad/0x780 kernel/bpf/hashtab.c:1438 bpf_prog_c4ae881bb5a4a584+0x45/0x49 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x522/0x7c0 kernel/events/core.c:10286 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496 perf_bp_event+0x28c/0x330 kernel/events/core.c:10478 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: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: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+0x14f/0x350 lib/strncpy_from_user.c:139 Code: 37 50 4a 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:ffffc90004a1fb50 EFLAGS: 00040246 RAX: ffffffff84382619 RBX: ffffc90004a1fc70 RCX: ffff88802ffc3b80 RDX: 0000000000000002 RSI: 000000000000007f RDI: 0000000000000007 RBP: ffffc90004a1fc70 R08: ffff88802ffc3b80 R09: 0000000000000003 R10: 0000000000000002 R11: 0000000000000002 R12: 000000000000007f R13: 0000000000000000 R14: 000000000000007f R15: 656c6c616b7a7973 strncpy_from_bpfptr include/linux/bpfptr.h:85 [inline] bpf_prog_load+0x1f3/0x1560 kernel/bpf/syscall.c:2535 __sys_bpf+0x5b8/0x780 kernel/bpf/syscall.c:5030 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 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: 0033:0x7f93ff99aeb9 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:00007f93fdbd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f93ffc16090 RCX: 00007f93ff99aeb9 RDX: 0000000000000090 RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f93ffa08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f93ffc16128 R14: 00007f93ffc16090 R15: 00007ffd775e72d8 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 50 push %rax 1: 4a fd rex.WX std 3: 49 83 fc 07 cmp $0x7,%r12 7: 0f 86 a1 00 00 00 jbe 0xae d: 4c 89 74 24 08 mov %r14,0x8(%rsp) 12: 48 c7 44 24 10 f8 ff movq $0xfffffffffffffff8,0x10(%rsp) 19: ff ff 1b: 45 31 ed xor %r13d,%r13d 1e: 4c 89 3c 24 mov %r15,(%rsp) 22: 48 89 dd mov %rbx,%rbp 25: 4f 8b 3c 2f mov (%r15,%r13,1),%r15 * 29: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax <-- trapping instruction 30: fe fe fe 33: 49 8d 1c 07 lea (%r15,%rax,1),%rbx 37: 4d 89 fe mov %r15,%r14 3a: 49 f7 d6 not %r14 3d: 48 rex.W 3e: b8 .byte 0xb8