================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
syz.0.17/4426 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffff888078b3f820 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166
{INITIAL USE} state was registered at:
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166
htab_lru_map_delete_elem+0x1ad/0x760 kernel/bpf/hashtab.c:1438
bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
bpf_overflow_handler+0x525/0x7b0 kernel/events/core.c:10286
__perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9572 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9610
perf_bp_event+0x23a/0x2a0 kernel/events/core.c:10478
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:87 [inline]
atomic_notifier_call_chain+0x17a/0x2b0 kernel/notifier.c:225
notify_die+0x12d/0x180 kernel/notifier.c:593
notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018
exc_debug_user arch/x86/kernel/traps.c:1144 [inline]
noist_exc_debug+0x73/0x120 arch/x86/kernel/traps.c:1181
asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:648
irq event stamp: 2248
hardirqs last enabled at (2247): [<ffffffff8a17a5c0>] exc_debug_kernel arch/x86/kernel/traps.c:1093 [inline]
hardirqs last enabled at (2247): [<ffffffff8a17a5c0>] exc_debug+0xf0/0x130 arch/x86/kernel/traps.c:1175
hardirqs last disabled at (2248): [<ffffffff8a17a53e>] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline]
hardirqs last disabled at (2248): [<ffffffff8a17a53e>] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175
softirqs last enabled at (1894): [<ffffffff818f072f>] bpf_prog_load+0x117f/0x15a0 kernel/bpf/syscall.c:2674
softirqs last disabled at (1892): [<ffffffff818d4a79>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (1892): [<ffffffff818d4a79>] bpf_ksym_add+0x29/0x340 kernel/bpf/core.c:649
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.0.17/4426.
stack backtrace:
CPU: 1 PID: 4426 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
<#DB>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
lock_acquire+0x2ce/0x490 kernel/locking/lockdep.c:5653
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166
htab_lru_map_delete_elem+0x1ad/0x760 kernel/bpf/hashtab.c:1438
bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
bpf_overflow_handler+0x525/0x7b0 kernel/events/core.c:10286
__perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9572 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9610
perf_bp_event+0x23a/0x2a0 kernel/events/core.c:10478
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:87 [inline]
atomic_notifier_call_chain+0x17a/0x2b0 kernel/notifier.c:225
notify_die+0x12d/0x180 kernel/notifier.c:593
notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018
exc_debug_kernel arch/x86/kernel/traps.c:1075 [inline]
exc_debug+0xd9/0x130 arch/x86/kernel/traps.c:1175
asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:648
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 <f3> a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003407b40 EFLAGS: 00050202
RAX: ffffffff84072901 RBX: 0000000000000078 RCX: 0000000000000036
RDX: 0000000000000078 RSI: 0000200000000302 RDI: ffffc9000256b08a
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffff520004ad618
R10: fffff520004ad618 R11: 1ffff920004ad609 R12: 00007fffffffef88
R13: 1ffff92000680f84 R14: ffffc9000256b048 R15: 00002000000002c0
</#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+0xf4/0x170 lib/usercopy.c:23
copy_from_user include/linux/uaccess.h:161 [inline]
copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline]
copy_from_bpfptr+0x67/0x80 include/linux/bpfptr.h:59
bpf_prog_load+0xb4b/0x15a0 kernel/bpf/syscall.c:2619
__sys_bpf+0x520/0x6d0 kernel/bpf/syscall.c:5027
__do_sys_bpf kernel/bpf/syscall.c:5131 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5129 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5129
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc9a858f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcb4c1fc88 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc9a87e5fa0 RCX: 00007fc9a858f749
RDX: 0000000000000094 RSI: 00002000000007c0 RDI: 0000000000000005
RBP: 00007fc9a8613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9a87e5fa0 R14: 00007fc9a87e5fa0 R15: 0000000000000003
</TASK>
----------------
Code disassembly (best guess):
0: ff c9 dec %ecx
2: 75 f2 jne 0xfffffff6
4: 89 d1 mov %edx,%ecx
6: c1 e9 03 shr $0x3,%ecx
9: 83 e2 07 and $0x7,%edx
c: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi)
f: 89 d1 mov %edx,%ecx
11: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi)
13: 31 c0 xor %eax,%eax
15: 0f 01 ca clac
18: c3 ret
19: 8d 0c ca lea (%rdx,%rcx,8),%ecx
1c: 89 ca mov %ecx,%edx
1e: eb 20 jmp 0x40
20: 0f 01 cb stac
23: 83 fa 40 cmp $0x40,%edx
26: 72 38 jb 0x60
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: 89 ca mov %ecx,%edx
34: eb 0a jmp 0x40
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop