================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.2.2031/11823 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88807572e3a0 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket+0x179/0x2f0 kernel/bpf/hashtab.c:166 {INITIAL USE} state was registered at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x179/0x2f0 kernel/bpf/hashtab.c:166 htab_lru_map_update_elem+0x31e/0xe80 kernel/bpf/hashtab.c:1214 bpf_map_update_value+0x59e/0x670 kernel/bpf/syscall.c:228 map_update_elem+0x4d7/0x680 kernel/bpf/syscall.c:1473 __sys_bpf+0x4ec/0x780 kernel/bpf/syscall.c:5018 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 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: 802 hardirqs last enabled at (801): [] ___slab_alloc+0x1047/0x1240 mm/slub.c:3088 hardirqs last disabled at (802): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (802): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (676): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (676): [] btf_alloc_id+0x91/0x2d0 kernel/bpf/btf.c:1586 softirqs last disabled at (674): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (674): [] btf_alloc_id+0x30/0x2d0 kernel/bpf/btf.c:1582 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.2.2031/11823. stack backtrace: CPU: 1 PID: 11823 Comm: syz.2.2031 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lock_acquire+0x2df/0x4a0 kernel/locking/lockdep.c:5653 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x179/0x2f0 kernel/bpf/hashtab.c:166 htab_lru_map_delete_elem+0x1ad/0x780 kernel/bpf/hashtab.c:1438 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x522/0x7c0 kernel/events/core.c:10286 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496 perf_bp_event+0x28c/0x330 kernel/events/core.c:10478 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: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+0x10/0x40 arch/x86/lib/copy_user_64.S:234 Code: d1 f3 a4 89 c8 0f 01 ca c3 89 d0 0f 01 ca c3 01 ca eb e7 90 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 RSP: 0018:ffffc90004226f88 EFLAGS: 00040202 RAX: ffffffff84110d01 RBX: 0000000000000018 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffff8880554bc674 RDI: 00002000000002fa RBP: 0000000000000000 R08: 2020202020202020 R09: 1ffff1100aa978d0 R10: dffffc0000000000 R11: ffffed100aa978d1 R12: 00007fffffffefe8 R13: 0000000000000018 R14: 00002000000002f2 R15: ffff8880554bc66c 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+0xea/0x130 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:169 [inline] bpf_verifier_vlog+0x172/0x390 kernel/bpf/log.c:34 verbose+0x1f2/0x2b0 kernel/bpf/verifier.c:303 print_insn_state+0xf5/0x1b0 kernel/bpf/verifier.c:928 do_check kernel/bpf/verifier.c:12491 [inline] do_check_common+0x5597/0xc6d0 kernel/bpf/verifier.c:14933 do_check_main kernel/bpf/verifier.c:14996 [inline] bpf_check+0xb08f/0x10db0 kernel/bpf/verifier.c:15573 bpf_prog_load+0x101a/0x1560 kernel/bpf/syscall.c:2651 __sys_bpf+0x5b8/0x780 kernel/bpf/syscall.c:5030 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 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: 0033:0x7f0d7259c799 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:00007f0d73445028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f0d72815fa0 RCX: 00007f0d7259c799 RDX: 000000000000006d RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f0d72632bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0d72816038 R14: 00007f0d72815fa0 R15: 00007fff47039778 ---------------- Code disassembly (best guess): 0: d1 f3 shl $1,%ebx 2: a4 movsb %ds:(%rsi),%es:(%rdi) 3: 89 c8 mov %ecx,%eax 5: 0f 01 ca clac 8: c3 ret 9: 89 d0 mov %edx,%eax b: 0f 01 ca clac e: c3 ret f: 01 ca add %ecx,%edx 11: eb e7 jmp 0xfffffffa 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 89 d1 mov %edx,%ecx 1c: 83 e2 07 and $0x7,%edx 1f: c1 e9 03 shr $0x3,%ecx 22: 74 12 je 0x36 24: 4c 8b 06 mov (%rsi),%r8 27: 4c 89 07 mov %r8,(%rdi) * 2a: 48 8d 76 08 lea 0x8(%rsi),%rsi <-- trapping instruction 2e: 48 8d 7f 08 lea 0x8(%rdi),%rdi 32: ff c9 dec %ecx 34: 75 ee jne 0x24 36: 21 d2 and %edx,%edx 38: 74 10 je 0x4a 3a: 89 d1 mov %edx,%ecx 3c: 8a 06 mov (%rsi),%al 3e: 88 07 mov %al,(%rdi)