================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.2097/13345 [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: 5458 hardirqs last enabled at (5457): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 hardirqs last disabled at (5458): [] exc_debug_kernel arch/x86/kernel/traps.c:1063 [inline] hardirqs last disabled at (5458): [] exc_debug+0x73/0x140 arch/x86/kernel/traps.c:1199 softirqs last enabled at (5326): [] do_softirq+0xfa/0x1a0 kernel/softirq.c:479 softirqs last disabled at (5277): [] do_softirq+0xfa/0x1a0 kernel/softirq.c:479 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.0.2097/13345. stack backtrace: CPU: 0 PID: 13345 Comm: syz.0.2097 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:copy_iovec_from_user lib/iov_iter.c:1383 [inline] RIP: 0010:__import_iovec_ubuf lib/iov_iter.c:1449 [inline] RIP: 0010:__import_iovec+0x190/0x850 lib/iov_iter.c:1468 Code: 6b b7 fd 48 c7 03 00 00 00 00 4c 89 fb e9 d3 04 00 00 4d 85 e4 0f 88 5d 05 00 00 0f 01 cb 0f ae e8 4d 8b 7c 24 08 49 8b 1c 24 <31> ff 4c 89 fe e8 c6 fa 5e fd 4d 85 ff 0f 88 4d 05 00 00 e8 78 f6 RSP: 0018:ffffc9000c0cfaa0 EFLAGS: 00040206 RAX: 1ffff92001819fac RBX: 00002000000000c0 RCX: 0000000000000002 RDX: ffff88802b6dbc00 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000008 R08: ffffc9000c0cfd60 R09: ffffc9000c0cfe30 R10: ffffc9000c0cfe70 R11: fffff52001819fd0 R12: 0000200000000300 R13: dffffc0000000000 R14: ffffc9000c0cfcc0 R15: 0000000000000039 import_iovec+0x73/0xa0 lib/iov_iter.c:1535 copy_msghdr_from_user net/socket.c:2532 [inline] sendmsg_copy_msghdr net/socket.c:2626 [inline] ___sys_sendmsg+0x256/0x360 net/socket.c:2645 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685 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: 0033:0x7fedc219ce59 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:00007fedc2f95028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fedc2415fa0 RCX: 00007fedc219ce59 RDX: 0000000000040800 RSI: 0000200000000140 RDI: 0000000000000009 RBP: 00007fedc2232e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fedc2416038 R14: 00007fedc2415fa0 R15: 00007ffc92ec9408 ---------------- Code disassembly (best guess): 0: 6b b7 fd 48 c7 03 00 imul $0x0,0x3c748fd(%rdi),%esi 7: 00 00 add %al,(%rax) 9: 00 4c 89 fb add %cl,-0x5(%rcx,%rcx,4) d: e9 d3 04 00 00 jmp 0x4e5 12: 4d 85 e4 test %r12,%r12 15: 0f 88 5d 05 00 00 js 0x578 1b: 0f 01 cb stac 1e: 0f ae e8 lfence 21: 4d 8b 7c 24 08 mov 0x8(%r12),%r15 26: 49 8b 1c 24 mov (%r12),%rbx * 2a: 31 ff xor %edi,%edi <-- trapping instruction 2c: 4c 89 fe mov %r15,%rsi 2f: e8 c6 fa 5e fd call 0xfd5efafa 34: 4d 85 ff test %r15,%r15 37: 0f 88 4d 05 00 00 js 0x58a 3d: e8 .byte 0xe8 3e: 78 f6 js 0x36