syzbot

================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
syz.4.38/6112 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffffe8ffffc4b390 (&loc_l->lock){....}-{2:2}, at: bpf_common_lru_push_free kernel/bpf/bpf_lru_list.c:514 [inline]
ffffe8ffffc4b390 (&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+0x106/0x350 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_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_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:2025
  bpf_map_do_batch+0x39b/0x630 kernel/bpf/syscall.c:5689
  __sys_bpf+0x7c1/0x950 kernel/bpf/syscall.c:-1
  __do_sys_bpf kernel/bpf/syscall.c:6361 [inline]
  __se_sys_bpf kernel/bpf/syscall.c:6359 [inline]
  __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6359
  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: 201564
hardirqs last  enabled at (201563): [<ffffffff8bb5a11d>] syscall_enter_from_user_mode include/linux/entry-common.h:187 [inline]
hardirqs last  enabled at (201563): [<ffffffff8bb5a11d>] do_syscall_64+0x9d/0xf80 arch/x86/entry/syscall_64.c:89
hardirqs last disabled at (201564): [<ffffffff8bb5e2d0>] exc_debug_kernel+0x60/0x140 arch/x86/kernel/traps.c:1235
softirqs last  enabled at (201522): [<ffffffff81d7fe24>] bpf_prog_load+0x1504/0x1a10 kernel/bpf/syscall.c:3108
softirqs last disabled at (201520): [<ffffffff81d5a30d>] spin_lock_bh include/linux/spinlock.h:348 [inline]
softirqs last disabled at (201520): [<ffffffff81d5a30d>] bpf_ksym_add+0x2d/0x340 kernel/bpf/core.c:640

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&loc_l->lock);
  <Interrupt>
    lock(&loc_l->lock);

 *** DEADLOCK ***

no locks held by syz.4.38/6112.

stack backtrace:
CPU: 0 UID: 0 PID: 6112 Comm: syz.4.38 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_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: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:1402 [inline]
 __bpf_prog_run include/linux/filter.h:722 [inline]
 bpf_prog_run include/linux/filter.h:729 [inline]
 bpf_overflow_handler kernel/events/core.c:10601 [inline]
 __perf_event_overflow+0x3b7/0xec0 kernel/events/core.c:10700
 perf_swevent_overflow kernel/events/core.c:10841 [inline]
 perf_swevent_event+0x410/0x7e0 kernel/events/core.c:-1
 perf_bp_event+0x318/0x430 kernel/events/core.c:11733
 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:rep_movs_alternative+0x33/0x90 arch/x86/lib/copy_user_64.S:61
Code: 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc 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
RSP: 0018:ffffc90002f17cf8 EFLAGS: 00040202
RAX: 00000100ffffffff RBX: 000000000000000c RCX: 000000000000000c
RDX: 0000000000000001 RSI: 0000200000000300 RDI: ffffc90002f17d60
RBP: ffffc90002f17eb8 R08: ffffc90002f17d6b R09: 1ffff920005e2fad
R10: dffffc0000000000 R11: fffff520005e2fae R12: dffffc0000000000
R13: 000000000000000c R14: ffffc90002f17d60 R15: 0000200000000300
 </#DB>
 <TASK>
 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]
 _inline_copy_from_user include/linux/uaccess.h:185 [inline]
 _copy_from_user+0x7a/0xb0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:223 [inline]
 copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline]
 copy_from_bpfptr include/linux/bpfptr.h:59 [inline]
 __sys_bpf+0x229/0x950 kernel/bpf/syscall.c:6221
 __do_sys_bpf kernel/bpf/syscall.c:6361 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6359 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6359
 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: 0033:0x7f5fb3d9cdd9
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:00007ffd4de45858 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5fb4015fa0 RCX: 00007f5fb3d9cdd9
RDX: 000000000000000c RSI: 0000200000000300 RDI: 000000000000000e
RBP: 00007f5fb3e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5fb4015fac R14: 00007f5fb4015fa0 R15: 00007f5fb4015fa0
 </TASK>
----------------
Code disassembly (best guess):
   0:	73 25                	jae    0x27
   2:	85 c9                	test   %ecx,%ecx
   4:	74 0f                	je     0x15
   6:	8a 06                	mov    (%rsi),%al
   8:	88 07                	mov    %al,(%rdi)
   a:	48 ff c7             	inc    %rdi
   d:	48 ff c6             	inc    %rsi
  10:	48 ff c9             	dec    %rcx
  13:	75 f1                	jne    0x6
  15:	c3                   	ret
  16:	cc                   	int3
  17:	cc                   	int3
  18:	cc                   	int3
  19:	cc                   	int3
  1a:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  21:	00 00 00
  24:	0f 1f 00             	nopl   (%rax)
  27:	48 8b 06             	mov    (%rsi),%rax
* 2a:	48 89 07             	mov    %rax,(%rdi) <-- trapping instruction
  2d:	48 83 c6 08          	add    $0x8,%rsi
  31:	48 83 c7 08          	add    $0x8,%rdi
  35:	83 e9 08             	sub    $0x8,%ecx
  38:	74 db                	je     0x15
  3a:	83 f9 08             	cmp    $0x8,%ecx
  3d:	73 e8                	jae    0x27
  3f:	eb                   	.byte 0xeb