syzbot

================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
syz.4.442/5259 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffff88807c7b6820 (&htab->lockdep_key#167){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline]
ffff88807c7b6820 (&htab->lockdep_key#167){....}-{2:2}, at: htab_lru_map_delete_elem+0x1b1/0x640 kernel/bpf/hashtab.c:1397
{INITIAL USE} state was registered at:
  lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
  _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
  htab_lock_bucket kernel/bpf/hashtab.c:183 [inline]
  htab_lru_map_update_elem+0x37a/0xc40 kernel/bpf/hashtab.c:1173
  bpf_map_update_value+0x57d/0x650 kernel/bpf/syscall.c:223
  generic_map_update_batch+0x52d/0x7d0 kernel/bpf/syscall.c:1430
  bpf_map_do_batch+0x466/0x600 kernel/bpf/syscall.c:-1
  __sys_bpf+0x671/0x6f0 kernel/bpf/syscall.c:-1
  __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
  __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
  __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
  do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
  entry_SYSCALL_64_after_hwframe+0x66/0xd0
irq event stamp: 962
hardirqs last  enabled at (961): [<ffffffff89c64892>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last  enabled at (961): [<ffffffff89c64892>] _raw_spin_unlock_irqrestore+0x82/0x120 kernel/locking/spinlock.c:194
hardirqs last disabled at (962): [<ffffffff89bcb54e>] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline]
hardirqs last disabled at (962): [<ffffffff89bcb54e>] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029
softirqs last  enabled at (260): [<ffffffff81495b1b>] __do_softirq kernel/softirq.c:610 [inline]
softirqs last  enabled at (260): [<ffffffff81495b1b>] invoke_softirq kernel/softirq.c:450 [inline]
softirqs last  enabled at (260): [<ffffffff81495b1b>] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
softirqs last disabled at (193): [<ffffffff81495b1b>] __do_softirq kernel/softirq.c:610 [inline]
softirqs last disabled at (193): [<ffffffff81495b1b>] invoke_softirq kernel/softirq.c:450 [inline]
softirqs last disabled at (193): [<ffffffff81495b1b>] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659

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

       CPU0
       ----
  lock(&htab->lockdep_key#167);
  <Interrupt>
    lock(&htab->lockdep_key#167);

 *** DEADLOCK ***

no locks held by syz.4.442/5259.

stack backtrace:
CPU: 0 PID: 5259 Comm: syz.4.442 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <#DB>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 lock_acquire+0x2c3/0x400 kernel/locking/lockdep.c:5614
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
 htab_lock_bucket kernel/bpf/hashtab.c:183 [inline]
 htab_lru_map_delete_elem+0x1b1/0x640 kernel/bpf/hashtab.c:1397
 bpf_prog_2c29ac5cdc6b1842+0x3a/0xe4
 bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 bpf_overflow_handler+0x1c2/0x4a0 kernel/events/core.c:10297
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_bp_event+0x276/0x320 kernel/events/core.c:10484
 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
 hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
 notifier_call_chain kernel/notifier.c:83 [inline]
 atomic_notifier_call_chain+0x15d/0x280 kernel/notifier.c:198
 notify_die+0x141/0x1a0 kernel/notifier.c:529
 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:872
 exc_debug_kernel arch/x86/kernel/traps.c:929 [inline]
 exc_debug+0xcf/0x130 arch/x86/kernel/traps.c:1029
 asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:642
RIP: 0010:copy_user_generic_unrolled+0xa0/0xc0 arch/x86/lib/copy_user_64.S:101
Code: 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 <88> 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca c3 90 90 90 90
RSP: 0018:ffffc9000365fbe0 EFLAGS: 00040202
RAX: ffffffff83e40800 RBX: 0000000000000006 RCX: 0000000000000004
RDX: 0000000000000006 RSI: 0000200000000300 RDI: ffff88807d27c5ca
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000006
R10: dffffc0000000000 R11: ffffed100fa4f8b9 R12: 00007ffffffff000
R13: 0000200000000304 R14: ffff88807d27c5c8 R15: 00002000000002fe
 </#DB>
 <TASK>
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 _copy_from_user+0xfa/0x170 lib/usercopy.c:23
 copy_from_user include/linux/uaccess.h:192 [inline]
 generic_map_update_batch+0x483/0x7d0 kernel/bpf/syscall.c:1425
 bpf_map_do_batch+0x466/0x600 kernel/bpf/syscall.c:-1
 __sys_bpf+0x671/0x6f0 kernel/bpf/syscall.c:-1
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f24d27c8e59
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:00007f24d1e2a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f24d2a41fa0 RCX: 00007f24d27c8e59
RDX: 0000000000000038 RSI: 0000200000000380 RDI: 000000000000001a
RBP: 00007f24d285ed6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f24d2a42038 R14: 00007f24d2a41fa0 R15: 00007ffecf1fb218
 </TASK>
----------------
Code disassembly (best guess):
   0:	7f 40                	jg     0x42
   2:	ff c9                	dec    %ecx
   4:	75 b6                	jne    0xffffffbc
   6:	89 d1                	mov    %edx,%ecx
   8:	83 e2 07             	and    $0x7,%edx
   b:	c1 e9 03             	shr    $0x3,%ecx
   e:	74 12                	je     0x22
  10:	4c 8b 06             	mov    (%rsi),%r8
  13:	4c 89 07             	mov    %r8,(%rdi)
  16:	48 8d 76 08          	lea    0x8(%rsi),%rsi
  1a:	48 8d 7f 08          	lea    0x8(%rdi),%rdi
  1e:	ff c9                	dec    %ecx
  20:	75 ee                	jne    0x10
  22:	21 d2                	and    %edx,%edx
  24:	74 10                	je     0x36
  26:	89 d1                	mov    %edx,%ecx
  28:	8a 06                	mov    (%rsi),%al
* 2a:	88 07                	mov    %al,(%rdi) <-- trapping instruction
  2c:	48 ff c6             	inc    %rsi
  2f:	48 ff c7             	inc    %rdi
  32:	ff c9                	dec    %ecx
  34:	75 f2                	jne    0x28
  36:	31 c0                	xor    %eax,%eax
  38:	0f 01 ca             	clac
  3b:	c3                   	ret
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop