================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.5.5099/21496 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8da840b8 (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+0x1bc/0x4a0 kernel/locking/lockdep.c:5790 __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: 466 hardirqs last enabled at (465): [] syscall_enter_from_user_mode+0x21/0x80 kernel/entry/common.c:120 hardirqs last disabled at (466): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (466): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (360): [] bpf_prog_load+0x111d/0x1530 kernel/bpf/syscall.c:2677 softirqs last disabled at (358): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (358): [] 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); lock(kernfs_rename_lock); *** DEADLOCK *** no locks held by syz.5.5099/21496. stack backtrace: CPU: 0 PID: 21496 Comm: syz.5.5099 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lock_acquire+0x2df/0x4a0 kernel/locking/lockdep.c:5781 __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:1013 [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:has_zero arch/x86/include/asm/word-at-a-time.h:49 [inline] RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:54 [inline] RIP: 0010:strncpy_from_user+0x14c/0x340 lib/strncpy_from_user.c:139 Code: 89 e6 e8 77 44 44 fd 49 83 fc 07 0f 86 9a 00 00 00 4c 89 74 24 08 48 c7 44 24 10 f8 ff ff ff 45 31 ed 4c 89 3c 24 4f 8b 3c 2f <48> b8 ff fe fe fe fe fe fe fe 49 8d 2c 07 4d 89 fe 49 f7 d6 48 b8 RSP: 0018:ffffc90004b0fd40 EFLAGS: 00040246 RAX: ffffffff843e05e9 RBX: ffff888034b21120 RCX: ffff88807ca4bc00 RDX: 0000000000000000 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: 0000000000000000 R08: ffffea0000d2c807 R09: 1ffffd40001a5900 R10: dffffc0000000000 R11: fffff940001a5901 R12: 0000000000000fe0 R13: 0000000000000000 R14: 0000000000000fe0 R15: 742e70756f726763 getname_flags+0xf2/0x500 fs/namei.c:150 do_sys_openat2+0xdd/0x4f0 fs/open.c:1314 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 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: 0033:0x7feeec19e1d9 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:00007feeed0d0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007feeec425fa0 RCX: 00007feeec19e1d9 RDX: 0000000000000002 RSI: 0000200000000300 RDI: 0000000000000009 RBP: 00007feeec235888 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007feeec426038 R14: 00007feeec425fa0 R15: 00007ffc1a2defb8 ---------------- Code disassembly (best guess): 0: 89 e6 mov %esp,%esi 2: e8 77 44 44 fd call 0xfd44447e 7: 49 83 fc 07 cmp $0x7,%r12 b: 0f 86 9a 00 00 00 jbe 0xab 11: 4c 89 74 24 08 mov %r14,0x8(%rsp) 16: 48 c7 44 24 10 f8 ff movq $0xfffffffffffffff8,0x10(%rsp) 1d: ff ff 1f: 45 31 ed xor %r13d,%r13d 22: 4c 89 3c 24 mov %r15,(%rsp) 26: 4f 8b 3c 2f mov (%r15,%r13,1),%r15 * 2a: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax <-- trapping instruction 31: fe fe fe 34: 49 8d 2c 07 lea (%r15,%rax,1),%rbp 38: 4d 89 fe mov %r15,%r14 3b: 49 f7 d6 not %r14 3e: 48 rex.W 3f: b8 .byte 0xb8