================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.2.1530/9341 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88807c89ed20 (&htab->lockdep_key#2){....}-{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: 1346 hardirqs last enabled at (1345): [] seqcount_lockdep_reader_access+0x106/0x190 include/linux/seqlock.h:104 hardirqs last disabled at (1346): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (1346): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (1302): [] netlink_insert+0x1034/0x13c0 net/netlink/af_netlink.c:589 softirqs last disabled at (1300): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (1300): [] release_sock+0x2b/0x1b0 net/core/sock.c:3509 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.2.1530/9341. stack backtrace: CPU: 1 PID: 9341 Comm: syz.2.1530 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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_c4ae881bb5a4a584+0x45/0x49 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x6e8/0x7c0 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_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166 Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900033b7958 EFLAGS: 00050206 RAX: ffffffff840eb701 RBX: ffffc90003579000 RCX: 000000000000fd33 RDX: 000000000000fe33 RSI: 0000200000000340 RDI: ffffc90003579100 RBP: ffffc900033b7a90 R08: ffffc90003588e32 R09: 1ffff920006b11c6 R10: dffffc0000000000 R11: fffff520006b11c7 R12: 1ffff92000676f83 R13: 0000200000000240 R14: 000000000000fe33 R15: 00007ffffffef1cd 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:183 [inline] _copy_from_iter+0x2a9/0x1130 lib/iov_iter.c:631 copy_from_iter include/linux/uio.h:187 [inline] copy_from_iter_full include/linux/uio.h:194 [inline] memcpy_from_msg include/linux/skbuff.h:4044 [inline] netlink_sendmsg+0x755/0xbd0 net/netlink/af_netlink.c:1857 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] sock_write_iter+0x2d9/0x3e0 net/socket.c:1143 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x4b1/0xa30 fs/read_write.c:584 ksys_write+0x14c/0x250 fs/read_write.c:637 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: 0033:0x7f6f13d9aeb9 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:00007f6f11fd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6f14016090 RCX: 00007f6f13d9aeb9 RDX: 000000000000fe33 RSI: 0000200000000240 RDI: 0000000000000010 RBP: 00007f6f13e08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6f14016128 R14: 00007f6f14016090 R15: 00007ffe33b35b78 ---------------- Code disassembly (best guess): 0: ff c9 dec %ecx 2: 75 f2 jne 0xfffffff6 4: 89 d1 mov %edx,%ecx 6: c1 e9 03 shr $0x3,%ecx 9: 83 e2 07 and $0x7,%edx c: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) f: 89 d1 mov %edx,%ecx 11: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 13: 31 c0 xor %eax,%eax 15: 0f 01 ca clac 18: c3 ret 19: 8d 0c ca lea (%rdx,%rcx,8),%ecx 1c: 89 ca mov %ecx,%edx 1e: eb 20 jmp 0x40 20: 0f 01 cb stac 23: 83 fa 40 cmp $0x40,%edx 26: 72 38 jb 0x60 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: 89 ca mov %ecx,%edx 34: eb 0a jmp 0x40 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop