================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.8.2876/15954 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffe8ffffd5f800 (&loc_l->lock){....}-{2:2}, at: bpf_common_lru_push_free kernel/bpf/bpf_lru_list.c:514 [inline] ffffe8ffffd5f800 (&loc_l->lock){....}-{2:2}, at: bpf_lru_push_free+0x33b/0xbb0 kernel/bpf/bpf_lru_list.c:553 {INITIAL USE} state was registered at: lock_acquire+0xf0/0x2e0 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:162 bpf_common_lru_pop_free kernel/bpf/bpf_lru_list.c:440 [inline] bpf_lru_pop_free+0x1a1/0x1ca0 kernel/bpf/bpf_lru_list.c:496 prealloc_lru_pop kernel/bpf/hashtab.c:301 [inline] __htab_lru_percpu_map_update_elem+0x198/0x790 kernel/bpf/hashtab.c:1443 bpf_percpu_hash_update+0x119/0x200 kernel/bpf/hashtab.c:2515 bpf_map_update_value+0x45a/0x920 kernel/bpf/syscall.c:273 generic_map_update_batch+0x6ea/0x990 kernel/bpf/syscall.c:2032 bpf_map_do_batch+0x39b/0x630 kernel/bpf/syscall.c:5669 __sys_bpf+0x7c1/0x950 kernel/bpf/syscall.c:-1 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 4976 hardirqs last enabled at (4975): [] class_irqsave_destructor include/linux/irqflags.h:266 [inline] hardirqs last enabled at (4975): [] perf_swevent_event+0x6e8/0x7e0 kernel/events/core.c:10907 hardirqs last disabled at (4976): [] exc_debug_kernel+0x60/0x140 arch/x86/kernel/traps.c:1233 softirqs last enabled at (4350): [] bpf_prog_load+0x15d4/0x1ae0 kernel/bpf/syscall.c:3119 softirqs last disabled at (4346): [] spin_lock_bh include/linux/spinlock.h:347 [inline] softirqs last disabled at (4346): [] bpf_ksym_add+0x2d/0x340 kernel/bpf/core.c:641 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.8.2876/15954. stack backtrace: CPU: 1 UID: 0 PID: 15954 Comm: syz.8.2876 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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+0x1b8/0x2e0 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:162 bpf_common_lru_push_free kernel/bpf/bpf_lru_list.c:514 [inline] bpf_lru_push_free+0x33b/0xbb0 kernel/bpf/bpf_lru_list.c:553 htab_lru_push_free kernel/bpf/hashtab.c:1271 [inline] htab_lru_map_delete_elem+0x3d3/0x440 kernel/bpf/hashtab.c:1561 bpf_prog_464bc2be3fc7c272+0x43/0x4b bpf_dispatcher_nop_func include/linux/bpf.h:1402 [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:10605 [inline] __perf_event_overflow+0x3b7/0xec0 kernel/events/core.c:10704 perf_swevent_overflow kernel/events/core.c:10845 [inline] perf_swevent_event+0x410/0x7e0 kernel/events/core.c:-1 perf_bp_event+0x318/0x430 kernel/events/core.c:11737 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+0x1be/0x400 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:copy_iovec_from_user lib/iov_iter.c:1288 [inline] RIP: 0010:__import_iovec_ubuf lib/iov_iter.c:1354 [inline] RIP: 0010:__import_iovec+0x1b7/0x7e0 lib/iov_iter.c:1373 Code: df e8 2d c8 82 fd 48 c7 03 00 00 00 00 e9 8f 04 00 00 4d 39 e7 0f 82 28 05 00 00 0f 01 cb 0f ae e8 4d 8b 6c 24 08 49 8b 1c 24 <31> ff 4c 89 ee e8 1f 84 18 fd 4d 85 ed 0f 88 18 05 00 00 e8 31 7f RSP: 0018:ffffc9000c46fa50 EFLAGS: 00040206 RAX: ffffffff84ad1d3a RBX: 0000200000002280 RCX: ffff8880304e3d00 RDX: 0000000000000002 RSI: 0000200000000300 RDI: 00007ffffffff000 RBP: 0000000000000001 R08: ffffc9000c46fd20 R09: ffffc9000c46fdf0 R10: ffffc9000c46fe30 R11: fffff5200188dfc8 R12: 0000200000000300 R13: 0000000000000058 R14: ffffc9000c46fc80 R15: 00007ffffffff000 import_iovec+0x73/0xa0 lib/iov_iter.c:1440 copy_msghdr_from_user net/socket.c:2529 [inline] sendmsg_copy_msghdr net/socket.c:2623 [inline] ___sys_sendmsg+0x255/0x360 net/socket.c:2642 __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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7c62b9c799 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:00007f7c639e4028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7c62e15fa0 RCX: 00007f7c62b9c799 RDX: 0000000000000000 RSI: 0000200000000340 RDI: 000000000000000c RBP: 00007f7c62c32bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7c62e16038 R14: 00007f7c62e15fa0 R15: 00007ffe281493b8 ---------------- Code disassembly (best guess): 0: df e8 fucomip %st(0),%st 2: 2d c8 82 fd 48 sub $0x48fd82c8,%eax 7: c7 03 00 00 00 00 movl $0x0,(%rbx) d: e9 8f 04 00 00 jmp 0x4a1 12: 4d 39 e7 cmp %r12,%r15 15: 0f 82 28 05 00 00 jb 0x543 1b: 0f 01 cb stac 1e: 0f ae e8 lfence 21: 4d 8b 6c 24 08 mov 0x8(%r12),%r13 26: 49 8b 1c 24 mov (%r12),%rbx * 2a: 31 ff xor %edi,%edi <-- trapping instruction 2c: 4c 89 ee mov %r13,%rsi 2f: e8 1f 84 18 fd call 0xfd188453 34: 4d 85 ed test %r13,%r13 37: 0f 88 18 05 00 00 js 0x555 3d: e8 .byte 0xe8 3e: 31 .byte 0x31 3f: 7f .byte 0x7f