================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.3.3244/17474 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8d2974d8 (kernfs_rename_lock){....}-{2:2}, at: kernfs_path_from_node+0x88/0xbd0 fs/kernfs/dir.c:229 {INITIAL USE} state was registered at: lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326 kernfs_rename_ns+0x5e4/0x830 fs/kernfs/dir.c:1762 sysfs_rename_link_ns+0x175/0x1b0 fs/sysfs/symlink.c:192 device_rename+0x110/0x1e0 drivers/base/core.c:4597 dev_change_name+0x308/0x8e0 net/core/dev.c:1291 do_setlink+0x925/0x3f40 net/core/rtnetlink.c:2889 __rtnl_newlink net/core/rtnetlink.c:3707 [inline] rtnl_newlink+0x1848/0x2170 net/core/rtnetlink.c:3754 rtnetlink_rcv_msg+0x843/0xf90 net/core/rtnetlink.c:6476 netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x4a9/0x6b0 net/socket.c:2201 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __x64_sys_sendto+0xde/0xf0 net/socket.c:2209 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 1184 hardirqs last enabled at (1183): [] syscall_enter_from_user_mode+0x25/0x80 kernel/entry/common.c:117 hardirqs last disabled at (1184): [] exc_debug_kernel arch/x86/kernel/traps.c:1063 [inline] hardirqs last disabled at (1184): [] exc_debug+0x73/0x140 arch/x86/kernel/traps.c:1199 softirqs last enabled at (980): [] sock_orphan include/net/sock.h:2179 [inline] softirqs last enabled at (980): [] unix_release_sock+0x4cd/0xe60 net/unix/af_unix.c:651 softirqs last disabled at (978): [] sock_orphan include/net/sock.h:2175 [inline] softirqs last disabled at (978): [] unix_release_sock+0x455/0xe60 net/unix/af_unix.c:651 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(kernfs_rename_lock); lock(kernfs_rename_lock); *** DEADLOCK *** no locks held by syz.3.3244/17474. stack backtrace: CPU: 0 PID: 17474 Comm: syz.3.3244 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: <#DB> dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 lock_acquire+0x2c2/0x420 kernel/locking/lockdep.c:5745 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236 kernfs_path_from_node+0x88/0xbd0 fs/kernfs/dir.c:229 kernfs_path include/linux/kernfs.h:597 [inline] cgroup_path include/linux/cgroup.h:601 [inline] get_mm_memcg_path+0xb9/0x360 mm/mmap_lock.c:82 __mmap_lock_do_trace_start_locking+0xe6/0x2f0 mm/mmap_lock.c:95 __mmap_lock_trace_start_locking include/linux/mmap_lock.h:29 [inline] mmap_read_trylock include/linux/mmap_lock.h:164 [inline] stack_map_get_build_id_offset+0x5d3/0x720 kernel/bpf/stackmap.c:141 __bpf_get_stackid+0x564/0x900 kernel/bpf/stackmap.c:247 bpf_prog_12712c88fd19bd5b+0x29/0x2d bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline] __bpf_prog_run include/linux/filter.h:616 [inline] bpf_prog_run include/linux/filter.h:623 [inline] bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10576 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9712 perf_swevent_overflow kernel/events/core.c:9795 [inline] perf_swevent_event+0x319/0x570 kernel/events/core.c:9846 perf_bp_event+0x319/0x430 kernel/events/core.c:10773 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x23e/0x670 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain+0x18f/0x380 kernel/notifier.c:93 atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:231 notify_die+0x145/0x1a0 kernel/notifier.c:596 notify_debug+0x2e/0x50 arch/x86/kernel/traps.c:1042 exc_debug_kernel arch/x86/kernel/traps.c:1099 [inline] exc_debug+0xde/0x140 arch/x86/kernel/traps.c:1199 asm_exc_debug+0x1e/0x40 arch/x86/include/asm/idtentry.h:644 RIP: 0010:rep_movs_alternative+0x4c/0x90 arch/x86/lib/copy_user_64.S:72 Code: c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 f3 a4 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 RSP: 0018:ffffc9000460fd50 EFLAGS: 00040206 RAX: ffffffff84294d01 RBX: 0000000000000090 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000200000000310 RDI: ffffc9000460fe50 RBP: ffffc9000460fee8 R08: ffffc9000460fe4f R09: 1ffff920008c1fc9 R10: dffffc0000000000 R11: fffff520008c1fca R12: 0000200000000310 R13: 0000000000000090 R14: ffffc9000460fdc0 R15: 0000200000000280 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:127 [inline] _copy_from_user+0x8b/0xe0 lib/usercopy.c:23 copy_from_user include/linux/uaccess.h:183 [inline] copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline] copy_from_bpfptr include/linux/bpfptr.h:59 [inline] __sys_bpf+0x23e/0x890 kernel/bpf/syscall.c:5450 __do_sys_bpf kernel/bpf/syscall.c:5581 [inline] __se_sys_bpf kernel/bpf/syscall.c:5579 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5579 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9b3019ce59 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:00007f9b2e3f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f9b30415fa0 RCX: 00007f9b3019ce59 RDX: 0000000000000094 RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007f9b30232e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9b30416038 R14: 00007f9b30415fa0 R15: 00007ffd5751c7d8 ---------------- Code disassembly (best guess): 0: c3 ret 1: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 8: 00 00 00 b: 0f 1f 00 nopl (%rax) e: 48 8b 06 mov (%rsi),%rax 11: 48 89 07 mov %rax,(%rdi) 14: 48 83 c6 08 add $0x8,%rsi 18: 48 83 c7 08 add $0x8,%rdi 1c: 83 e9 08 sub $0x8,%ecx 1f: 74 df je 0x0 21: 83 f9 08 cmp $0x8,%ecx 24: 73 e8 jae 0xe 26: eb c9 jmp 0xfffffff1 28: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) * 2a: c3 ret <-- trapping instruction 2b: 48 8b 06 mov (%rsi),%rax 2e: 48 89 07 mov %rax,(%rdi) 31: 48 8d 47 08 lea 0x8(%rdi),%rax 35: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 39: 48 29 f8 sub %rdi,%rax 3c: 48 01 c7 add %rax,%rdi 3f: 48 rex.W