================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.3.8113/31486 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff8880588baa38 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x8e/0x620 kernel/bpf/lpm_trie.c:466 {INITIAL USE} state was registered at: lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 trie_update_elem+0xbe/0xd40 kernel/bpf/lpm_trie.c:335 bpf_map_update_value+0x59d/0x670 kernel/bpf/syscall.c:228 map_update_elem+0x4fa/0x6a0 kernel/bpf/syscall.c:1473 __sys_bpf+0x4ec/0x780 kernel/bpf/syscall.c:5023 __do_sys_bpf kernel/bpf/syscall.c:5139 [inline] __se_sys_bpf kernel/bpf/syscall.c:5137 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5137 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 2588 hardirqs last enabled at (2587): [] syscall_enter_from_user_mode+0x21/0x80 kernel/entry/common.c:120 hardirqs last disabled at (2588): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (2588): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (2516): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (2516): [] fpregs_lock arch/x86/include/asm/fpu/api.h:72 [inline] softirqs last enabled at (2516): [] fpu_clone+0x274/0xc70 arch/x86/kernel/fpu/core.c:628 softirqs last disabled at (2514): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (2514): [] fpregs_lock arch/x86/include/asm/fpu/api.h:72 [inline] softirqs last disabled at (2514): [] fpu_clone+0x274/0xc70 arch/x86/kernel/fpu/core.c:628 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&trie->lock); lock(&trie->lock); *** DEADLOCK *** no locks held by syz.3.8113/31486. stack backtrace: CPU: 1 PID: 31486 Comm: syz.3.8113 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lock_acquire+0x2df/0x4a0 kernel/locking/lockdep.c:5781 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 trie_delete_elem+0x8e/0x620 kernel/bpf/lpm_trie.c:466 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1013 [inline] __bpf_prog_run include/linux/filter.h:597 [inline] bpf_prog_run include/linux/filter.h:615 [inline] bpf_overflow_handler+0x6d1/0x790 kernel/events/core.c:10331 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9506 perf_swevent_overflow kernel/events/core.c:9589 [inline] perf_swevent_event+0x315/0x570 kernel/events/core.c:9640 perf_bp_event+0x311/0x3f0 kernel/events/core.c:10528 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x14d/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+0x141/0x1a0 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_short_string+0x24/0x40 arch/x86/lib/copy_user_64.S:243 Code: 90 90 90 90 90 90 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 8d 14 ca eb RSP: 0018:ffffc900030d7a88 EFLAGS: 00040202 RAX: ffffffff8416c36e RBX: 0000000000000004 RCX: 0000000000000004 RDX: 0000000000000004 RSI: 0000200000000300 RDI: ffffc900030d7ca0 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200061af94 R12: 00007fffffffeffc R13: ffffffff819a58e0 R14: ffffc900030d7ca0 R15: 0000200000000300 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] __htab_map_lookup_and_delete_batch+0x372/0x25a0 kernel/bpf/hashtab.c:1704 bpf_map_do_batch+0x475/0x5f0 kernel/bpf/syscall.c:-1 __sys_bpf+0x6f7/0x780 kernel/bpf/syscall.c:-1 __do_sys_bpf kernel/bpf/syscall.c:5139 [inline] __se_sys_bpf kernel/bpf/syscall.c:5137 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5137 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f42b5f9e199 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:00007f42b6db0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f42b6225fa0 RCX: 00007f42b5f9e199 RDX: 0000000000000038 RSI: 0000200000000780 RDI: 0000000000000019 RBP: 00007f42b60358e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f42b6226038 R14: 00007f42b6225fa0 R15: 00007ffe078fab58 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 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: 8d 14 ca lea (%rdx,%rcx,8),%edx 3f: eb .byte 0xeb