================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.7056/25067 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888057165a18 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] ffff888057165a18 (&htab->lockdep_key){....}-{2:2}, at: htab_lru_map_delete_elem+0x1b1/0x640 kernel/bpf/hashtab.c:1397 {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_lru_map_update_elem+0x37a/0xc40 kernel/bpf/hashtab.c:1173 bpf_map_update_value+0x57d/0x650 kernel/bpf/syscall.c:223 generic_map_update_batch+0x52d/0x7d0 kernel/bpf/syscall.c:1430 bpf_map_do_batch+0x466/0x600 kernel/bpf/syscall.c:-1 __sys_bpf+0x671/0x6f0 kernel/bpf/syscall.c:-1 __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: 3554 hardirqs last enabled at (3553): [] kasan_quarantine_put+0xd4/0x220 mm/kasan/quarantine.c:231 hardirqs last disabled at (3554): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (3554): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (3344): [] spin_unlock_bh include/linux/spinlock.h:409 [inline] softirqs last enabled at (3344): [] __ip6_ins_rt net/ipv6/route.c:1307 [inline] softirqs last enabled at (3344): [] ip6_route_add+0x90/0x130 net/ipv6/route.c:3868 softirqs last disabled at (3314): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (3314): [] __ip6_ins_rt net/ipv6/route.c:1305 [inline] softirqs last disabled at (3314): [] ip6_route_add+0x71/0x130 net/ipv6/route.c:3868 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.0.7056/25067. stack backtrace: CPU: 0 PID: 25067 Comm: syz.0.7056 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_lru_map_delete_elem+0x1b1/0x640 kernel/bpf/hashtab.c:1397 bpf_prog_2c29ac5cdc6b1842+0x3a/0x644 bpf_dispatcher_nop_func include/linux/bpf.h:888 [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:10297 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 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:__put_user_nocheck_1+0x5/0x11 Code: e8 61 b9 6e fd 89 d8 5b 41 5e 41 5f 5d c3 00 00 cc cc 00 00 cc cc 48 bb 00 f0 ff ff ff 7f 00 00 48 39 d9 73 74 0f 01 cb 88 01 <31> c9 0f 01 ca c3 90 90 90 90 90 90 48 bb ff ef ff ff ff 7f 00 00 RSP: 0018:ffffc90002f1f550 EFLAGS: 00040287 RAX: 0000000000000000 RBX: 00007ffffffff000 RCX: 0000200000000300 RDX: 0000000000000000 RSI: ffffffff8a2b3aa0 RDI: ffffffff8a79fe00 RBP: 0000000000000001 R08: ffffffff8d89f02f R09: 1ffffffff1b13e05 R10: dffffc0000000000 R11: fffffbfff1b13e06 R12: ffff8880599fc000 R13: 1ffff1100b33f94e R14: dffffc0000000000 R15: ffff8880599fca70 bpf_vlog_reset kernel/bpf/verifier.c:317 [inline] do_check_common+0x116c/0x16e0 kernel/bpf/verifier.c:13523 do_check_main kernel/bpf/verifier.c:13575 [inline] bpf_check+0x9c84/0xf270 kernel/bpf/verifier.c:14146 bpf_prog_load+0xfec/0x1510 kernel/bpf/syscall.c:2354 __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: 0033:0x7f70848e8e59 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:00007f7082b42028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f7084b61fa0 RCX: 00007f70848e8e59 RDX: 0000000000000070 RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007f708497ed6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7084b62038 R14: 00007f7084b61fa0 R15: 00007fffe784fbe8 ---------------- Code disassembly (best guess): 0: e8 61 b9 6e fd call 0xfd6eb966 5: 89 d8 mov %ebx,%eax 7: 5b pop %rbx 8: 41 5e pop %r14 a: 41 5f pop %r15 c: 5d pop %rbp d: c3 ret e: 00 00 add %al,(%rax) 10: cc int3 11: cc int3 12: 00 00 add %al,(%rax) 14: cc int3 15: cc int3 16: 48 bb 00 f0 ff ff ff movabs $0x7ffffffff000,%rbx 1d: 7f 00 00 20: 48 39 d9 cmp %rbx,%rcx 23: 73 74 jae 0x99 25: 0f 01 cb stac 28: 88 01 mov %al,(%rcx) * 2a: 31 c9 xor %ecx,%ecx <-- trapping instruction 2c: 0f 01 ca clac 2f: c3 ret 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 48 bb ff ef ff ff ff movabs $0x7fffffffefff,%rbx 3d: 7f 00 00