================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.1.389/5961 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888024f76188 (&htab->lockdep_key#2){....}-{2:2}, at: htab_lock_bucket kernel/bpf/hashtab.c:183 [inline] ffff888024f76188 (&htab->lockdep_key#2){....}-{2:2}, at: htab_lru_map_delete_elem+0x1b1/0x640 kernel/bpf/hashtab.c:1397 {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_lru_map_update_elem+0x37a/0xc40 kernel/bpf/hashtab.c:1173 bpf_map_update_value+0x57d/0x650 kernel/bpf/syscall.c:223 map_update_elem+0x626/0x770 kernel/bpf/syscall.c:1194 __sys_bpf+0x3fb/0x670 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: 688 hardirqs last enabled at (687): [] syscall_enter_from_user_mode+0x21/0x70 kernel/entry/common.c:113 hardirqs last disabled at (688): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (688): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (0): [] copy_process+0x139d/0x3e00 kernel/fork.c:2235 softirqs last disabled at (0): [<0000000000000000>] 0x0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->lockdep_key#2); lock(&htab->lockdep_key#2); *** DEADLOCK *** no locks held by syz.1.389/5961. stack backtrace: CPU: 1 PID: 5961 Comm: syz.1.389 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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_lru_map_delete_elem+0x1b1/0x640 kernel/bpf/hashtab.c:1397 bpf_prog_2c29ac5cdc6b1842+0x3a/0x220 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:check_zeroed_user+0xe8/0x200 lib/usercopy.c:76 Code: 00 4c 89 e7 4c 89 ee e8 66 ed 9c fd 48 89 d8 4c 01 f0 0f 82 e0 00 00 00 4c 39 e0 0f 87 d7 00 00 00 0f 01 cb 0f ae e8 4d 8b 26 <42> 8d 0c fd 00 00 00 00 49 d3 ec 49 d3 e4 bf 08 00 00 00 48 89 de RSP: 0018:ffffc9000132fd80 EFLAGS: 00040287 RAX: 0000200000000314 RBX: 0000000000000014 RCX: ffff88805dc6d940 RDX: 0000000000000000 RSI: 0000200000000314 RDI: 00007ffffffff000 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ad26b6 R10: fffffbfff1ad26b6 R11: 1ffffffff1ad26b5 R12: 00002000000003c0 R13: 0000200000000314 R14: 0000200000000300 R15: 0000000000000000 bpf_check_uarg_tail_zero kernel/bpf/syscall.c:94 [inline] __sys_bpf+0x15b/0x670 kernel/bpf/syscall.c:4623 __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: 0033:0x7f1686cb6749 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:00007f1684efc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f1686f0d090 RCX: 00007f1686cb6749 RDX: 0000000000000094 RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007f1686d3af91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1686f0d128 R14: 00007f1686f0d090 R15: 00007ffd7aad0328 ---------------- Code disassembly (best guess): 0: 00 4c 89 e7 add %cl,-0x19(%rcx,%rcx,4) 4: 4c 89 ee mov %r13,%rsi 7: e8 66 ed 9c fd call 0xfd9ced72 c: 48 89 d8 mov %rbx,%rax f: 4c 01 f0 add %r14,%rax 12: 0f 82 e0 00 00 00 jb 0xf8 18: 4c 39 e0 cmp %r12,%rax 1b: 0f 87 d7 00 00 00 ja 0xf8 21: 0f 01 cb stac 24: 0f ae e8 lfence 27: 4d 8b 26 mov (%r14),%r12 * 2a: 42 8d 0c fd 00 00 00 lea 0x0(,%r15,8),%ecx <-- trapping instruction 31: 00 32: 49 d3 ec shr %cl,%r12 35: 49 d3 e4 shl %cl,%r12 38: bf 08 00 00 00 mov $0x8,%edi 3d: 48 89 de mov %rbx,%rsi