================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.4.2187/16072 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffe8ffffd660d8 (&l->lock#2){....}-{2:2}, at: bpf_percpu_lru_push_free kernel/bpf/bpf_lru_list.c:541 [inline] ffffe8ffffd660d8 (&l->lock#2){....}-{2:2}, at: bpf_lru_push_free+0xcb/0xbb0 kernel/bpf/bpf_lru_list.c:551 {INITIAL USE} state was registered at: lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166 bpf_percpu_lru_pop_free kernel/bpf/bpf_lru_list.c:407 [inline] bpf_lru_pop_free+0xcc/0x1ca0 kernel/bpf/bpf_lru_list.c:494 prealloc_lru_pop kernel/bpf/hashtab.c:301 [inline] htab_lru_map_update_elem+0x122/0x870 kernel/bpf/hashtab.c:1307 bpf_map_update_value+0x750/0x920 kernel/bpf/syscall.c:297 generic_map_update_batch+0x6ea/0x990 kernel/bpf/syscall.c:2071 bpf_map_do_batch+0x39b/0x630 kernel/bpf/syscall.c:5740 __sys_bpf+0xbe3/0xd90 kernel/bpf/syscall.c:-1 __do_sys_bpf kernel/bpf/syscall.c:6443 [inline] __se_sys_bpf kernel/bpf/syscall.c:6440 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6440 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 628 hardirqs last enabled at (627): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (627): [] _raw_spin_unlock_irqrestore+0x30/0x80 kernel/locking/spinlock.c:198 hardirqs last disabled at (628): [] exc_debug_kernel+0x60/0x140 arch/x86/kernel/traps.c:1235 softirqs last enabled at (542): [] bpf_prog_load+0x1504/0x1a10 kernel/bpf/syscall.c:3154 softirqs last disabled at (540): [] spin_lock_bh include/linux/spinlock.h:348 [inline] softirqs last disabled at (540): [] bpf_ksym_add+0x2d/0x340 kernel/bpf/core.c:640 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&l->lock#2); lock(&l->lock#2); *** DEADLOCK *** no locks held by syz.4.2187/16072. stack backtrace: CPU: 1 UID: 0 PID: 16072 Comm: syz.4.2187 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: <#DB> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_usage_bug+0x28b/0x2e0 kernel/locking/lockdep.c:4042 lock_acquire+0x1cc/0x350 kernel/locking/lockdep.c:5859 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166 bpf_percpu_lru_push_free kernel/bpf/bpf_lru_list.c:541 [inline] bpf_lru_push_free+0xcb/0xbb0 kernel/bpf/bpf_lru_list.c:551 htab_lru_push_free kernel/bpf/hashtab.c:1275 [inline] htab_lru_map_delete_elem+0x3d3/0x440 kernel/bpf/hashtab.c:1565 bpf_prog_464bc2be3fc7c272+0x43/0x4b bpf_dispatcher_nop_func include/linux/bpf.h:1407 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_overflow_handler kernel/events/core.c:10641 [inline] __perf_event_overflow+0x3b7/0xec0 kernel/events/core.c:10740 perf_swevent_overflow kernel/events/core.c:10881 [inline] perf_swevent_event+0x410/0x7e0 kernel/events/core.c:-1 perf_bp_event+0x318/0x430 kernel/events/core.c:11782 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:556 [inline] hw_breakpoint_exceptions_notify+0x243/0x680 arch/x86/kernel/hw_breakpoint.c:587 notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85 atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:223 notify_die+0x144/0x1a0 kernel/notifier.c:588 notify_debug+0x2e/0x50 arch/x86/kernel/traps.c:1210 exc_debug_kernel+0xb1/0x140 arch/x86/kernel/traps.c:1272 asm_exc_debug+0x1e/0x40 arch/x86/include/asm/idtentry.h:654 RIP: 0010:has_zero arch/x86/include/asm/word-at-a-time.h:17 [inline] RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:54 [inline] RIP: 0010:strncpy_from_user+0xbb/0x2b0 lib/strncpy_from_user.c:130 Code: f6 e8 a9 d2 d6 fc 49 83 fe 07 0f 86 9d 00 00 00 48 89 1c 24 4c 89 74 24 08 48 c7 c5 f8 ff ff ff 45 31 ff 4c 89 e3 4f 8b 34 3c <48> b8 ff fe fe fe fe fe fe fe 4d 8d 24 06 4d 89 f5 49 f7 d5 48 b8 RSP: 0018:ffffc9000394fa38 EFLAGS: 00040246 RAX: ffffffff84eeff37 RBX: 0000200000000300 RCX: ffff888053303d80 RDX: 0000000000000002 RSI: 000000000000007f RDI: 0000000000000007 RBP: fffffffffffffff8 R08: ffffc9000394fbbe R09: 1ffff92000729f77 R10: dffffc0000000000 R11: fffff52000729f78 R12: 0000200000000300 R13: dffffc0000000000 R14: 656c6c616b7a7973 R15: 0000000000000000 bpf_prog_load+0xc8b/0x1a10 kernel/bpf/syscall.c:3063 __sys_bpf+0xd0b/0xd90 kernel/bpf/syscall.c:6324 __do_sys_bpf kernel/bpf/syscall.c:6443 [inline] __se_sys_bpf kernel/bpf/syscall.c:6440 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6440 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4ba359ce59 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:00007f4ba440a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f4ba3815fa0 RCX: 00007f4ba359ce59 RDX: 0000000000000094 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007f4ba3632d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4ba3816038 R14: 00007f4ba3815fa0 R15: 00007ffc67e33e48 ---------------- Code disassembly (best guess): 0: f6 e8 imul %al 2: a9 d2 d6 fc 49 test $0x49fcd6d2,%eax 7: 83 fe 07 cmp $0x7,%esi a: 0f 86 9d 00 00 00 jbe 0xad 10: 48 89 1c 24 mov %rbx,(%rsp) 14: 4c 89 74 24 08 mov %r14,0x8(%rsp) 19: 48 c7 c5 f8 ff ff ff mov $0xfffffffffffffff8,%rbp 20: 45 31 ff xor %r15d,%r15d 23: 4c 89 e3 mov %r12,%rbx 26: 4f 8b 34 3c mov (%r12,%r15,1),%r14 * 2a: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax <-- trapping instruction 31: fe fe fe 34: 4d 8d 24 06 lea (%r14,%rax,1),%r12 38: 4d 89 f5 mov %r14,%r13 3b: 49 f7 d5 not %r13 3e: 48 rex.W 3f: b8 .byte 0xb8