================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.17/4355 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff8880798d61d0 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] ffff8880798d61d0 (&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+0x197/0x3f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa4/0xf0 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_653fb3e4a9309dc2+0x42/0x5d0 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+0x1c4/0x4c0 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+0x224/0x290 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+0x12d/0x180 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: 2560 hardirqs last enabled at (2559): [] exc_debug_kernel arch/x86/kernel/traps.c:947 [inline] hardirqs last enabled at (2559): [] exc_debug+0xe6/0x130 arch/x86/kernel/traps.c:1029 hardirqs last disabled at (2560): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (2560): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (2288): [] bpf_prog_load+0x1150/0x1550 kernel/bpf/syscall.c:2380 softirqs last disabled at (2286): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (2286): [] 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); lock(&htab->lockdep_key); *** DEADLOCK *** no locks held by syz.0.17/4355. stack backtrace: CPU: 1 PID: 4355 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+0x168/0x230 lib/dump_stack.c:106 lock_acquire+0x2b2/0x3f0 kernel/locking/lockdep.c:5614 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa4/0xf0 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_653fb3e4a9309dc2+0x42/0x5d0 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+0x1c4/0x4c0 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+0x224/0x290 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+0x12d/0x180 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+0xa2/0xc0 arch/x86/lib/copy_user_64.S:102 Code: 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 90 90 RSP: 0018:ffffc9000333f0f8 EFLAGS: 00040202 RAX: ffffffff83daee20 RBX: 0000000000000004 RCX: 0000000000000002 RDX: 0000000000000004 RSI: ffff88807ccb466e RDI: 0000200000000302 RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100f9968ce R10: ffffed100f9968ce R11: 1ffff1100f9968cd R12: 00007ffffffff000 R13: 0000200000000304 R14: ffff88807ccb466c R15: 0000200000000300 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] _copy_to_user+0xf0/0x130 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:200 [inline] bpf_verifier_vlog+0x1b5/0x350 kernel/bpf/verifier.c:303 verbose+0x1dc/0x2a0 kernel/bpf/verifier.c:348 do_check+0x4785/0xeac0 kernel/bpf/verifier.c:11266 do_check_common+0xe67/0x16c0 kernel/bpf/verifier.c:13506 do_check_main kernel/bpf/verifier.c:13569 [inline] bpf_check+0x31f3/0xf090 kernel/bpf/verifier.c:14140 bpf_prog_load+0x1043/0x1550 kernel/bpf/syscall.c:2354 __sys_bpf+0x4c2/0x670 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: 0033:0x7f32fa1ce749 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:00007fffdab375e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f32fa424fa0 RCX: 00007f32fa1ce749 RDX: 0000000000000048 RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007f32fa252f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f32fa424fa0 R14: 00007f32fa424fa0 R15: 0000000000000003 ---------------- Code disassembly (best guess): 0: ff c9 dec %ecx 2: 75 b6 jne 0xffffffba 4: 89 d1 mov %edx,%ecx 6: 83 e2 07 and $0x7,%edx 9: c1 e9 03 shr $0x3,%ecx c: 74 12 je 0x20 e: 4c 8b 06 mov (%rsi),%r8 11: 4c 89 07 mov %r8,(%rdi) 14: 48 8d 76 08 lea 0x8(%rsi),%rsi 18: 48 8d 7f 08 lea 0x8(%rdi),%rdi 1c: ff c9 dec %ecx 1e: 75 ee jne 0xe 20: 21 d2 and %edx,%edx 22: 74 10 je 0x34 24: 89 d1 mov %edx,%ecx 26: 8a 06 mov (%rsi),%al 28: 88 07 mov %al,(%rdi) * 2a: 48 ff c6 inc %rsi <-- trapping instruction 2d: 48 ff c7 inc %rdi 30: ff c9 dec %ecx 32: 75 f2 jne 0x26 34: 31 c0 xor %eax,%eax 36: 0f 01 ca clac 39: c3 ret 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop