syzbot

================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
syz.0.17/4319 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffff8881472caf20 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline]
ffff8881472caf20 (&htab->lockdep_key){....}-{2:2}, at: htab_map_delete_elem+0x1b2/0x520 kernel/bpf/hashtab.c:1361
{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_map_delete_elem+0x1b2/0x520 kernel/bpf/hashtab.c:1361
  bpf_prog_2eee0e635ca9ce2f+0x3a/0xb08
  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_swevent_overflow kernel/events/core.c:9591 [inline]
  perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
  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_user arch/x86/kernel/traps.c:998 [inline]
  noist_exc_debug+0x73/0x120 arch/x86/kernel/traps.c:1035
  asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:642
irq event stamp: 8320
hardirqs last  enabled at (8319): [<ffffffff81a94972>] mod_memcg_state include/linux/memcontrol.h:969 [inline]
hardirqs last  enabled at (8319): [<ffffffff81a94972>] pcpu_memcg_post_alloc_hook+0x232/0x3b0 mm/percpu.c:1658
hardirqs last disabled at (8320): [<ffffffff89bca54e>] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline]
hardirqs last disabled at (8320): [<ffffffff89bca54e>] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029
softirqs last  enabled at (7532): [<ffffffff8186edf9>] bpf_prog_load+0x10f9/0x1510 kernel/bpf/syscall.c:2380
softirqs last disabled at (7530): [<ffffffff81854ff9>] spin_lock_bh include/linux/spinlock.h:369 [inline]
softirqs last disabled at (7530): [<ffffffff81854ff9>] bpf_ksym_add+0x29/0x340 kernel/bpf/core.c:633

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

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

 *** DEADLOCK ***

no locks held by syz.0.17/4319.

stack backtrace:
CPU: 1 PID: 4319 Comm: syz.0.17 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_map_delete_elem+0x1b2/0x520 kernel/bpf/hashtab.c:1361
 bpf_prog_2eee0e635ca9ce2f+0x3a/0xb08
 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_swevent_overflow kernel/events/core.c:9591 [inline]
 perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
 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_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:206
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 <f3> a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 89 d1 83 f8
RSP: 0018:ffffc9000306fb78 EFLAGS: 00050206
RAX: ffffffff83e40601 RBX: 0000000000000088 RCX: 0000000000000007
RDX: 0000000000000088 RSI: 0000200000000301 RDI: ffffc90000e560c9
RBP: 0000000000000000 R08: ffffc90000e560cf R09: 1ffff920001cac19
R10: dffffc0000000000 R11: fffff520001cac1a R12: 00007ffffffff000
R13: 0000200000000308 R14: ffffc90000e56048 R15: 0000200000000280
 </#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]
 copy_from_bpfptr_offset include/linux/bpfptr.h:52 [inline]
 copy_from_bpfptr+0x67/0x80 include/linux/bpfptr.h:58
 bpf_prog_load+0xb19/0x1510 kernel/bpf/syscall.c:2325
 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657
 __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: 0033:0x7fdb2a18add9
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:00007ffebbdfa048 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fdb2a403fa0 RCX: 00007fdb2a18add9
RDX: 0000000000000094 RSI: 00002000000004c0 RDI: 0000000000000005
RBP: 00007fdb2a220d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdb2a403fac R14: 00007fdb2a403fa0 R15: 00007fdb2a403fa0
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 d1                	mov    %edx,%ecx
   2:	c1 e9 03             	shr    $0x3,%ecx
   5:	83 e2 07             	and    $0x7,%edx
   8:	f3 48 a5             	rep movsq %ds:(%rsi),%es:(%rdi)
   b:	89 d1                	mov    %edx,%ecx
   d:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi)
   f:	31 c0                	xor    %eax,%eax
  11:	0f 01 ca             	clac
  14:	c3                   	ret
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	0f 01 cb             	stac
  1f:	83 fa 40             	cmp    $0x40,%edx
  22:	0f 82 70 ff ff ff    	jb     0xffffff98
  28:	89 d1                	mov    %edx,%ecx
* 2a:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
  2c:	31 c0                	xor    %eax,%eax
  2e:	0f 01 ca             	clac
  31:	c3                   	ret
  32:	90                   	nop
  33:	90                   	nop
  34:	90                   	nop
  35:	90                   	nop
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	89 d1                	mov    %edx,%ecx
  3e:	83                   	.byte 0x83
  3f:	f8                   	clc