================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.2.215/6700 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8e297dd8 (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:5790 __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:4665 dev_change_name+0x308/0x8e0 net/core/dev.c:1291 do_setlink+0x9b6/0x3f00 net/core/rtnetlink.c:2902 __rtnl_newlink net/core/rtnetlink.c:3720 [inline] rtnl_newlink+0x1848/0x2170 net/core/rtnetlink.c:3767 rtnetlink_rcv_msg+0x843/0xf90 net/core/rtnetlink.c:6489 netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2554 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x856/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1903 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: 1984 hardirqs last enabled at (1983): [] seqcount_lockdep_reader_access+0x10a/0x190 include/linux/seqlock.h:104 hardirqs last disabled at (1984): [] exc_debug_kernel arch/x86/kernel/traps.c:1063 [inline] hardirqs last disabled at (1984): [] exc_debug+0x73/0x140 arch/x86/kernel/traps.c:1199 softirqs last enabled at (1922): [] netlink_insert+0x10d0/0x13e0 net/netlink/af_netlink.c:589 softirqs last disabled at (1920): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (1920): [] release_sock+0x2f/0x1c0 net/core/sock.c:3579 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.2.215/6700. stack backtrace: CPU: 0 PID: 6700 Comm: syz.2.215 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 Call Trace: <#DB> dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 lock_acquire+0x2c2/0x420 kernel/locking/lockdep.c:5781 __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+0x661/0x810 kernel/bpf/stackmap.c:142 __bpf_get_stackid+0x5ac/0x980 kernel/bpf/stackmap.c:255 ____bpf_get_stackid kernel/bpf/stackmap.c:316 [inline] bpf_get_stackid+0x131/0x1f0 kernel/bpf/stackmap.c:291 bpf_prog_12712c88fd19bd5b+0x29/0x2d bpf_dispatcher_nop_func include/linux/bpf.h:1226 [inline] __bpf_prog_run include/linux/filter.h:617 [inline] bpf_prog_run include/linux/filter.h:624 [inline] bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10572 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9708 perf_swevent_overflow kernel/events/core.c:9791 [inline] perf_swevent_event+0x319/0x570 kernel/events/core.c:9842 perf_bp_event+0x319/0x430 kernel/events/core.c:10769 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+0x4a/0x90 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 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 a4 c3 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 RSP: 0018:ffffc9001a277958 EFLAGS: 00050206 RAX: ffffffff842cf101 RBX: 000000000000fe33 RCX: 000000000000fb13 RDX: 0000000000000001 RSI: 00002000000004e0 RDI: ffffc90003829320 RBP: ffffc9001a277a90 R08: ffffc90003838e32 R09: 1ffff920007071c6 R10: dffffc0000000000 R11: fffff520007071c7 R12: ffffc90003829000 R13: 00002000000001c0 R14: ffffc9001a277c18 R15: 1ffff9200344ef83 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] copyin lib/iov_iter.c:193 [inline] _copy_from_iter+0x242/0x1290 lib/iov_iter.c:391 copy_from_iter include/linux/uio.h:209 [inline] copy_from_iter_full include/linux/uio.h:216 [inline] memcpy_from_msg include/linux/skbuff.h:4117 [inline] netlink_sendmsg+0x76b/0xbf0 net/netlink/af_netlink.c:1888 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] sock_write_iter+0x2dc/0x420 net/socket.c:1161 call_write_iter include/linux/fs.h:2019 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x474/0x9a0 fs/read_write.c:584 ksys_write+0x151/0x260 fs/read_write.c:637 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: 0033:0x7fad1479fb19 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:00007fad156a3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fad14a25fa0 RCX: 00007fad1479fb19 RDX: 000000000000fe33 RSI: 00002000000001c0 RDI: 0000000000000008 RBP: 00007fad14837b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fad14a26038 R14: 00007fad14a25fa0 R15: 00007ffc1c3f0048 ---------------- Code disassembly (best guess): 0: 75 f1 jne 0xfffffff3 2: c3 ret 3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 d: 0f 1f 00 nopl (%rax) 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 df je 0x2 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c9 jmp 0xfffffff3 * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: 48 8b 06 mov (%rsi),%rax 30: 48 89 07 mov %rax,(%rdi) 33: 48 8d 47 08 lea 0x8(%rdi),%rax 37: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3b: 48 29 f8 sub %rdi,%rax 3e: 48 rex.W 3f: 01 .byte 0x1