================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.4.421/7574 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffe8ffffcabe10 (&loc_l->lock){....}-{2:2}, at: bpf_common_lru_push_free kernel/bpf/bpf_lru_list.c:514 [inline] ffffe8ffffcabe10 (&loc_l->lock){....}-{2:2}, at: bpf_lru_push_free+0x1f5/0x520 kernel/bpf/bpf_lru_list.c:553 {INITIAL USE} state was registered at: lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162 bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:440 [inline] bpf_lru_pop_free+0x1ab/0x19b0 kernel/bpf/bpf_lru_list.c:496 prealloc_lru_pop kernel/bpf/hashtab.c:299 [inline] htab_lru_map_update_elem+0x168/0x8a0 kernel/bpf/hashtab.c:1215 bpf_map_update_value+0x750/0x920 kernel/bpf/syscall.c:294 generic_map_update_batch+0x5b5/0x810 kernel/bpf/syscall.c:2038 bpf_map_do_batch+0x39b/0x630 kernel/bpf/syscall.c:5647 __sys_bpf+0x709/0x920 kernel/bpf/syscall.c:-1 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6272 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 618 hardirqs last enabled at (617): [] ___slab_alloc+0xbb5/0x1760 mm/slub.c:4555 hardirqs last disabled at (618): [] exc_debug_kernel+0x60/0x140 arch/x86/kernel/traps.c:1233 softirqs last enabled at (612): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (612): [] __alloc_skb+0x193/0x390 net/core/skbuff.c:672 softirqs last disabled at (610): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (610): [] __alloc_skb+0x193/0x390 net/core/skbuff.c:672 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&loc_l->lock); lock(&loc_l->lock); *** DEADLOCK *** no locks held by syz.4.421/7574. stack backtrace: CPU: 0 UID: 0 PID: 7574 Comm: syz.4.421 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 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/0x330 kernel/locking/lockdep.c:5859 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162 bpf_common_lru_push_free kernel/bpf/bpf_lru_list.c:514 [inline] bpf_lru_push_free+0x1f5/0x520 kernel/bpf/bpf_lru_list.c:553 htab_lru_push_free kernel/bpf/hashtab.c:1183 [inline] htab_lru_map_delete_elem+0x3a3/0x410 kernel/bpf/hashtab.c:1464 bpf_prog_464bc2be3fc7c272+0x43/0x4b bpf_dispatcher_nop_func include/linux/bpf.h:1378 [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:10303 [inline] __perf_event_overflow+0x3b7/0xec0 kernel/events/core.c:10402 perf_swevent_overflow kernel/events/core.c:10536 [inline] perf_swevent_event+0x323/0x650 kernel/events/core.c:-1 perf_bp_event+0x2a6/0x390 kernel/events/core.c:11395 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+0x19d/0x3a0 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:1208 exc_debug_kernel+0xb1/0x140 arch/x86/kernel/traps.c:1270 asm_exc_debug+0x1e/0x40 arch/x86/include/asm/idtentry.h:654 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc9000babf718 EFLAGS: 00050202 RAX: 00007ffffffff001 RBX: ffff888055c95040 RCX: 0000000000000008 RDX: 0000000000000001 RSI: 0000200000000310 RDI: ffff888055c95110 RBP: ffffc9000babf870 R08: ffff888055c95117 R09: 1ffff1100ab92a22 R10: dffffc0000000000 R11: ffffed100ab92a23 R12: ffffc9000babfdf8 R13: 0000200000000240 R14: 00000000000000d8 R15: 1ffff92001757fbf copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] copy_from_user_iter lib/iov_iter.c:67 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:302 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] __copy_from_iter lib/iov_iter.c:261 [inline] _copy_from_iter+0x21b/0x1670 lib/iov_iter.c:272 copy_from_iter include/linux/uio.h:228 [inline] copy_from_iter_full include/linux/uio.h:245 [inline] memcpy_from_msg include/linux/skbuff.h:4272 [inline] netlink_sendmsg+0x6c0/0xb40 net/netlink/af_netlink.c:1879 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x4d7/0x810 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdec099acb9 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:00007fdec18c5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdec0c15fa0 RCX: 00007fdec099acb9 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000007 RBP: 00007fdec0a08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdec0c16038 R14: 00007fdec0c15fa0 R15: 00007ffc16136a48 ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 d: 0f 1f 00 nopl (%rax) 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 db je 0xfffffffe 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c5 jmp 0xffffffef * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: 48 8b 06 mov (%rsi),%rax 34: 48 89 07 mov %rax,(%rdi) 37: 48 8d 47 08 lea 0x8(%rdi),%rax 3b: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3f: 48 rex.W