================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
syz.0.17/4433 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffffffff8cc844b8 (kernfs_rename_lock){....}-{2:2}, at: kernfs_path_from_node+0x84/0xd60 fs/kernfs/dir.c:232
{INITIAL USE} state was registered at:
  lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678
  __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
  _raw_spin_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:170
  spin_lock_irq include/linux/spinlock.h:376 [inline]
  kernfs_rename_ns+0x55d/0x990 fs/kernfs/dir.c:1734
  sysfs_rename_link_ns+0x171/0x1b0 fs/sysfs/symlink.c:192
  device_rename+0x11c/0x1a0 drivers/base/core.c:4577
  dev_change_name+0x37b/0x910 net/core/dev.c:1273
  do_setlink+0x967/0x29c0 net/core/rtnetlink.c:2825
  __rtnl_newlink net/core/rtnetlink.c:3622 [inline]
  rtnl_newlink+0x16e4/0x1f90 net/core/rtnetlink.c:3669
  rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6166
  netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516
  netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
  netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344
  netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877
  sock_sendmsg_nosec net/socket.c:718 [inline]
  __sock_sendmsg net/socket.c:730 [inline]
  __sys_sendto+0x497/0x650 net/socket.c:2153
  __do_sys_sendto net/socket.c:2165 [inline]
  __se_sys_sendto net/socket.c:2161 [inline]
  __x64_sys_sendto+0xda/0xf0 net/socket.c:2161
  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: 3846
hardirqs last  enabled at (3845): [<ffffffff8a328ee1>] syscall_enter_from_user_mode+0x21/0x80 kernel/entry/common.c:120
hardirqs last disabled at (3846): [<ffffffff8a325bce>] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline]
hardirqs last disabled at (3846): [<ffffffff8a325bce>] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175
softirqs last  enabled at (3716): [<ffffffff819088bd>] bpf_prog_load+0x111d/0x1530 kernel/bpf/syscall.c:2677
softirqs last disabled at (3714): [<ffffffff818ec778>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (3714): [<ffffffff818ec778>] bpf_ksym_add+0x28/0x330 kernel/bpf/core.c:650

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(kernfs_rename_lock);
  <Interrupt>
    lock(kernfs_rename_lock);

 *** DEADLOCK ***

no locks held by syz.0.17/4433.

stack backtrace:
CPU: 0 PID: 4433 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <#DB>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 lock_acquire+0x2df/0x4a0 kernel/locking/lockdep.c:5669
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
 kernfs_path_from_node+0x84/0xd60 fs/kernfs/dir.c:232
 kernfs_path include/linux/kernfs.h:595 [inline]
 cgroup_path include/linux/cgroup.h:674 [inline]
 get_mm_memcg_path+0xb9/0x360 mm/mmap_lock.c:82
 __mmap_lock_do_trace_acquire_returned+0xe7/0x390 mm/mmap_lock.c:102
 __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
 mmap_read_trylock include/linux/mmap_lock.h:137 [inline]
 stack_map_get_build_id_offset+0x699/0x9d0 kernel/bpf/stackmap.c:144
 __bpf_get_stackid+0x55d/0x920 kernel/bpf/stackmap.c:250
 bpf_prog_12712c88fd19bd5b+0x21/0x25
 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
 __bpf_prog_run include/linux/filter.h:608 [inline]
 bpf_prog_run include/linux/filter.h:615 [inline]
 bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10331
 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9506
 perf_swevent_overflow kernel/events/core.c:9589 [inline]
 perf_swevent_event+0x315/0x570 kernel/events/core.c:9640
 perf_bp_event+0x311/0x3f0 kernel/events/core.c:10528
 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
 hw_breakpoint_exceptions_notify+0x14d/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+0xd/0x40 arch/x86/lib/copy_user_64.S:233
Code: 74 0a 89 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
RSP: 0018:ffffc900033b7a18 EFLAGS: 00040202
RAX: ffffffff84164501 RBX: 0000000000000010 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000200000000300 RDI: ffffc900033b7cc0
RBP: 0000000000000000 R08: 0000000000000000 R09: 1ffff92000676f99
R10: dffffc0000000000 R11: fffff52000676f9a R12: 00007fffffffeff0
R13: 0000000000000010 R14: ffffc900033b7cc0 R15: 0000200000000300
 </#DB>
 <TASK>
 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]
 _copy_from_user+0xf4/0x170 lib/usercopy.c:23
 copy_from_user include/linux/uaccess.h:161 [inline]
 copy_iovec_from_user lib/iov_iter.c:1720 [inline]
 iovec_from_user+0x143/0x360 lib/iov_iter.c:1755
 __import_iovec+0x6c/0x510 lib/iov_iter.c:1773
 import_iovec+0x6f/0xa0 lib/iov_iter.c:1838
 copy_msghdr_from_user net/socket.c:2456 [inline]
 sendmsg_copy_msghdr net/socket.c:2550 [inline]
 ___sys_sendmsg+0x252/0x360 net/socket.c:2569
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609
 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: 0033:0x7f8a82b9e159
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:00007fff9c2fadc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8a82e25fa0 RCX: 00007f8a82b9e159
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000007
RBP: 00007f8a82c3503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8a82e25fac R14: 00007f8a82e25fa0 R15: 00007f8a82e25fa0
 </TASK>
----------------
Code disassembly (best guess):
   0:	74 0a                	je     0xc
   2:	89 d1                	mov    %edx,%ecx
   4:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi)
   6:	89 c8                	mov    %ecx,%eax
   8:	0f 01 ca             	clac
   b:	c3                   	ret
   c:	89 d0                	mov    %edx,%eax
   e:	0f 01 ca             	clac
  11:	c3                   	ret
  12:	01 ca                	add    %ecx,%edx
  14:	eb e7                	jmp    0xfffffffd
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	89 d1                	mov    %edx,%ecx
  1f:	83 e2 07             	and    $0x7,%edx
  22:	c1 e9 03             	shr    $0x3,%ecx
  25:	74 12                	je     0x39
  27:	4c 8b 06             	mov    (%rsi),%r8
* 2a:	4c 89 07             	mov    %r8,(%rdi) <-- trapping instruction
  2d:	48 8d 76 08          	lea    0x8(%rsi),%rsi
  31:	48 8d 7f 08          	lea    0x8(%rdi),%rdi
  35:	ff c9                	dec    %ecx
  37:	75 ee                	jne    0x27
  39:	21 d2                	and    %edx,%edx
  3b:	74 10                	je     0x4d
  3d:	89 d1                	mov    %edx,%ecx
  3f:	8a                   	.byte 0x8a