================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.3144/16233 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8cc84218 (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:5662 __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:2817 __rtnl_newlink net/core/rtnetlink.c:3614 [inline] rtnl_newlink+0x16e4/0x1f90 net/core/rtnetlink.c:3661 rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6158 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: 912 hardirqs last enabled at (911): [] mod_lruvec_page_state include/linux/vmstat.h:563 [inline] hardirqs last enabled at (911): [] __kmalloc_large_node+0x112/0x1f0 mm/slab_common.c:1080 hardirqs last disabled at (912): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (912): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (846): [] rcu_lock_acquire include/linux/rcupdate.h:350 [inline] softirqs last enabled at (846): [] rcu_read_lock include/linux/rcupdate.h:791 [inline] softirqs last enabled at (846): [] __rhashtable_insert_fast include/linux/rhashtable.h:713 [inline] softirqs last enabled at (846): [] rhltable_insert_key include/linux/rhashtable.h:852 [inline] softirqs last enabled at (846): [] rhltable_insert include/linux/rhashtable.h:879 [inline] softirqs last enabled at (846): [] toggle_bp_slot+0x194b/0x2b30 kernel/events/hw_breakpoint.c:521 softirqs last disabled at (844): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (844): [] rht_lock+0x1c/0x150 include/linux/rhashtable.h:329 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.0.3144/16233. stack backtrace: CPU: 0 PID: 16233 Comm: syz.0.3144 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lock_acquire+0x2df/0x4a0 kernel/locking/lockdep.c:5653 __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_start_locking+0xe3/0x380 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:135 [inline] stack_map_get_build_id_offset+0x673/0x9d0 kernel/bpf/stackmap.c:144 __bpf_get_stackid+0x55d/0x920 kernel/bpf/stackmap.c:250 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:377 [inline] bpf_get_stackid_pe+0x2ec/0x400 kernel/bpf/stackmap.c:334 bpf_prog_12712c88fd19bd5b+0x21/0x25 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10321 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9496 perf_swevent_overflow+0x19b/0x230 kernel/events/core.c:9579 perf_swevent_event+0x458/0x570 kernel/events/core.c:-1 perf_bp_event+0x311/0x3f0 kernel/events/core.c:10518 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_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166 Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900056cfcd0 EFLAGS: 00050202 RAX: ffffffff840ff001 RBX: 0000000000010001 RCX: 000000000000fec1 RDX: 0000000000010001 RSI: 0000200000000340 RDI: ffff8880638c0140 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: dffffc0000000000 R11: ffffed100c71a000 R12: 00007ffffffeefff R13: 0000200000000200 R14: ffff8880638c0000 R15: 0000200000000200 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_from_bpfptr_offset include/linux/bpfptr.h:53 [inline] copy_from_bpfptr include/linux/bpfptr.h:59 [inline] kvmemdup_bpfptr include/linux/bpfptr.h:74 [inline] map_update_elem+0x473/0x6a0 kernel/bpf/syscall.c:1467 __sys_bpf+0x4ec/0x780 kernel/bpf/syscall.c:5019 __do_sys_bpf kernel/bpf/syscall.c:5135 [inline] __se_sys_bpf kernel/bpf/syscall.c:5133 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133 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: 0033:0x7fd20eb9ce59 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:00007fd20f9e2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd20ee15fa0 RCX: 00007fd20eb9ce59 RDX: 0000000000000020 RSI: 0000200000000080 RDI: 0000000000000002 RBP: 00007fd20ec32e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd20ee16038 R14: 00007fd20ee15fa0 R15: 00007fff32f16148 ---------------- Code disassembly (best guess): 0: ff c9 dec %ecx 2: 75 f2 jne 0xfffffff6 4: 89 d1 mov %edx,%ecx 6: c1 e9 03 shr $0x3,%ecx 9: 83 e2 07 and $0x7,%edx c: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) f: 89 d1 mov %edx,%ecx 11: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 13: 31 c0 xor %eax,%eax 15: 0f 01 ca clac 18: c3 ret 19: 8d 0c ca lea (%rdx,%rcx,8),%ecx 1c: 89 ca mov %ecx,%edx 1e: eb 20 jmp 0x40 20: 0f 01 cb stac 23: 83 fa 40 cmp $0x40,%edx 26: 72 38 jb 0x60 28: 89 d1 mov %edx,%ecx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 31 c0 xor %eax,%eax 2e: 0f 01 ca clac 31: c3 ret 32: 89 ca mov %ecx,%edx 34: eb 0a jmp 0x40 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop