================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.1.4635/27370 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffe8ffffc51b88 (&loc_l->lock){....}-{2:2}, at: bpf_common_lru_push_free kernel/bpf/bpf_lru_list.c:514 [inline] ffffe8ffffc51b88 (&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+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+0x1a1/0x1ca0 kernel/bpf/bpf_lru_list.c:496 prealloc_lru_pop kernel/bpf/hashtab.c:296 [inline] htab_lru_map_update_elem+0x168/0x8a0 kernel/bpf/hashtab.c:1221 bpf_map_update_value+0x750/0x920 kernel/bpf/syscall.c:296 map_update_elem+0x5fa/0x9d0 kernel/bpf/syscall.c:1811 __sys_bpf+0x6fa/0x950 kernel/bpf/syscall.c:6216 __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+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 1080 hardirqs last enabled at (1079): [] kasan_quarantine_put+0xbb/0x1f0 mm/kasan/quarantine.c:234 hardirqs last disabled at (1080): [] exc_debug_kernel+0x60/0x140 arch/x86/kernel/traps.c:1233 softirqs last enabled at (1044): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (1044): [] __alloc_skb+0x193/0x390 net/core/skbuff.c:672 softirqs last disabled at (1042): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (1042): [] __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 *** 1 lock held by syz.1.4635/27370: #0: ffff888053cc9778 (&u->iolock){+.+.}-{4:4}, at: __unix_dgram_recvmsg+0x1e2/0xd50 net/unix/af_unix.c:2573 stack backtrace: CPU: 1 UID: 0 PID: 27370 Comm: syz.1.4635 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 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+0x33b/0xbb0 kernel/bpf/bpf_lru_list.c:553 htab_lru_push_free kernel/bpf/hashtab.c:1189 [inline] htab_lru_map_delete_elem+0x3a3/0x410 kernel/bpf/hashtab.c:1479 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: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:put_cmsg+0x1dc/0x5d0 net/core/scm.c:-1 Code: 9e 00 00 00 49 8d 6e f0 0f 1f 44 00 00 e8 dc 5a 5e f8 48 b8 00 f0 ff ff ff 7f 00 00 49 39 c5 4c 0f 47 e8 0f 01 cb 4d 89 75 00 <8b> 44 24 08 41 89 45 08 8b 44 24 0c 41 89 45 0c 49 83 c5 10 bf 07 RSP: 0018:ffffc9000b917700 EFLAGS: 00040287 RAX: 00007ffffffff000 RBX: 0000000000000014 RCX: ffff88802a8a8000 RDX: 0000000000000000 RSI: 0000000000000014 RDI: 0000000000000018 RBP: 0000000000000004 R08: ffffc9000b9177e0 R09: 0000000000000000 R10: ffffc9000b917288 R11: fffff52001722e53 R12: dffffc0000000000 R13: 0000200000000300 R14: 0000000000000014 R15: ffffc9000b9177e0 scm_pidfd_recv net/core/scm.c:484 [inline] scm_recv_unix+0x211/0x360 net/core/scm.c:545 __unix_dgram_recvmsg+0x9c5/0xd50 net/unix/af_unix.c:2655 sock_recvmsg_nosec net/socket.c:1078 [inline] sock_recvmsg+0x22c/0x270 net/socket.c:1100 ____sys_recvmsg+0x1e6/0x4a0 net/socket.c:2812 ___sys_recvmsg+0x215/0x590 net/socket.c:2854 __sys_recvmsg net/socket.c:2887 [inline] __do_sys_recvmsg net/socket.c:2893 [inline] __se_sys_recvmsg net/socket.c:2890 [inline] __x64_sys_recvmsg+0x1ba/0x2a0 net/socket.c:2890 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: 0033:0x7f51a7f9aeb9 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:00007f51a8dc9028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007f51a8215fa0 RCX: 00007f51a7f9aeb9 RDX: 0000000000000000 RSI: 0000200000000080 RDI: 000000000000000c RBP: 00007f51a8008c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f51a8216038 R14: 00007f51a8215fa0 R15: 00007ffdcdfe2568 ---------------- Code disassembly (best guess): 0: 9e sahf 1: 00 00 add %al,(%rax) 3: 00 49 8d add %cl,-0x73(%rcx) 6: 6e outsb %ds:(%rsi),(%dx) 7: f0 0f 1f 44 00 00 lock nopl 0x0(%rax,%rax,1) d: e8 dc 5a 5e f8 call 0xf85e5aee 12: 48 b8 00 f0 ff ff ff movabs $0x7ffffffff000,%rax 19: 7f 00 00 1c: 49 39 c5 cmp %rax,%r13 1f: 4c 0f 47 e8 cmova %rax,%r13 23: 0f 01 cb stac 26: 4d 89 75 00 mov %r14,0x0(%r13) * 2a: 8b 44 24 08 mov 0x8(%rsp),%eax <-- trapping instruction 2e: 41 89 45 08 mov %eax,0x8(%r13) 32: 8b 44 24 0c mov 0xc(%rsp),%eax 36: 41 89 45 0c mov %eax,0xc(%r13) 3a: 49 83 c5 10 add $0x10,%r13 3e: bf .byte 0xbf 3f: 07 (bad)