================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.1.3775/15681 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88807a0c7238 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x8e/0x620 kernel/bpf/lpm_trie.c:466 {INITIAL USE} state was registered at: lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737 __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+0xb9/0xc10 kernel/bpf/lpm_trie.c:323 bpf_map_update_value+0x57c/0x650 kernel/bpf/syscall.c:223 map_update_elem+0x603/0x760 kernel/bpf/syscall.c:1194 __sys_bpf+0x46b/0x6f0 kernel/bpf/syscall.c:4645 __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: 1238 hardirqs last enabled at (1237): [] mod_lruvec_page_state include/linux/vmstat.h:497 [inline] hardirqs last enabled at (1237): [] kmalloc_large_node+0x103/0x1a0 mm/slub.c:4429 hardirqs last disabled at (1238): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (1238): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (1168): [] sock_orphan include/net/sock.h:2094 [inline] softirqs last enabled at (1168): [] unix_release_sock+0x285/0xc60 net/unix/af_unix.c:536 softirqs last disabled at (1166): [] sock_orphan include/net/sock.h:2090 [inline] softirqs last disabled at (1166): [] unix_release_sock+0x208/0xc60 net/unix/af_unix.c:536 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.1.3775/15681. stack backtrace: CPU: 0 PID: 15681 Comm: syz.1.3775 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 lock_acquire+0x2c3/0x400 kernel/locking/lockdep.c:5728 __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_8cf82b2813d537eb+0x43/0x628 bpf_dispatcher_nop_func include/linux/bpf.h:890 [inline] __bpf_prog_run include/linux/filter.h:621 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_overflow_handler+0x3fd/0x4a0 kernel/events/core.c:10307 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9525 perf_bp_event+0x276/0x320 kernel/events/core.c:10494 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x212/0x470 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 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 89 d1 83 f8 RSP: 0018:ffffc90002f9f838 EFLAGS: 00050206 RAX: ffffffff83e73001 RBX: 000000000000fdef RCX: 000000000000fbaf RDX: 000000000000fdef RSI: 0000200000000340 RDI: ffff8880473a0280 RBP: ffffc90002f9f988 R08: ffff8880473afe2e R09: 1ffff11008e75fc5 R10: dffffc0000000000 R11: ffffed1008e75fc6 R12: ffff8880473a0040 R13: 000000000000fdff R14: 0000200000000100 R15: 0000000000000000 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] copyin lib/iov_iter.c:168 [inline] _copy_from_iter+0x322/0x1160 lib/iov_iter.c:777 copy_from_iter include/linux/uio.h:167 [inline] skb_copy_datagram_from_iter+0xf1/0x6c0 net/core/datagram.c:567 tun_get_user+0xb28/0x3b10 drivers/net/tun.c:1842 tun_chr_write_iter+0x112/0x1e0 drivers/net/tun.c:2030 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 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: 0033:0x7f51e681b199 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:00007f51e4a73028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f51e6aa2fa0 RCX: 00007f51e681b199 RDX: 000000000000fdef RSI: 0000200000000100 RDI: 00000000000000c8 RBP: 00007f51e68b28e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f51e6aa3038 R14: 00007f51e6aa2fa0 R15: 00007ffdab158b78 ---------------- 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