================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.2.15952/18902 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8c44fe58 (kernfs_rename_lock){....}-{2:2}, at: kernfs_path_from_node+0x84/0xb70 fs/kernfs/dir.c:224 {INITIAL USE} state was registered at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:389 [inline] kernfs_rename_ns+0x531/0x970 fs/kernfs/dir.c:1629 sysfs_rename_link_ns+0x171/0x1b0 fs/sysfs/symlink.c:192 device_rename+0x11c/0x1a0 drivers/base/core.c:4294 dev_change_name+0x2ee/0xc10 net/core/dev.c:1323 do_setlink+0x9e7/0x29d0 net/core/rtnetlink.c:2773 __rtnl_newlink net/core/rtnetlink.c:3464 [inline] rtnl_newlink+0x15bb/0x1920 net/core/rtnetlink.c:3586 rtnetlink_rcv_msg+0x7f1/0xf10 net/core/rtnetlink.c:5698 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2519 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2073 __do_sys_sendto net/socket.c:2085 [inline] __se_sys_sendto net/socket.c:2081 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2081 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 irq event stamp: 448 hardirqs last enabled at (447): [] syscall_enter_from_user_mode+0x21/0x70 kernel/entry/common.c:113 hardirqs last disabled at (448): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (448): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (288): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last enabled at (288): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last enabled at (288): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 softirqs last disabled at (205): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (205): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last disabled at (205): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 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.2.15952/18902. stack backtrace: CPU: 0 PID: 18902 Comm: syz.2.15952 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 lock_acquire+0x2c3/0x400 kernel/locking/lockdep.c:5614 __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+0x84/0xb70 fs/kernfs/dir.c:224 kernfs_path include/linux/kernfs.h:547 [inline] cgroup_path include/linux/cgroup.h:663 [inline] get_mm_memcg_path+0xba/0x330 mm/mmap_lock.c:82 __mmap_lock_do_trace_start_locking+0xe2/0x2f0 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:135 [inline] stack_map_get_build_id_offset+0x562/0x860 kernel/bpf/stackmap.c:185 __bpf_get_stackid+0x55d/0x920 kernel/bpf/stackmap.c:294 bpf_prog_12712c88fd19bd5b+0x21/0x3d4 bpf_dispatcher_nop_func include/linux/bpf.h:889 [inline] __bpf_prog_run include/linux/filter.h:621 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_overflow_handler+0x3fd/0x4a0 kernel/events/core.c:10307 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9525 perf_bp_event+0x276/0x320 kernel/events/core.c:10494 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:83 [inline] atomic_notifier_call_chain+0x15d/0x280 kernel/notifier.c:198 notify_die+0x141/0x1a0 kernel/notifier.c:529 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:872 exc_debug_kernel arch/x86/kernel/traps.c:929 [inline] exc_debug+0xcf/0x130 arch/x86/kernel/traps.c:1029 asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:642 RIP: 0010:check_zeroed_user+0xe8/0x200 lib/usercopy.c:76 Code: 00 4c 89 e7 4c 89 ee e8 86 6b 90 fd 48 89 d8 4c 01 f0 0f 82 e0 00 00 00 4c 39 e0 0f 87 d7 00 00 00 0f 01 cb 0f ae e8 4d 8b 26 <42> 8d 0c fd 00 00 00 00 49 d3 ec 49 d3 e4 bf 08 00 00 00 48 89 de RSP: 0018:ffffc900031dfd80 EFLAGS: 00040287 RAX: 0000200000000314 RBX: 0000000000000014 RCX: ffff88802ba83b80 RDX: 0000000000000000 RSI: 0000200000000314 RDI: 00007ffffffff000 RBP: 0000000000000000 R08: ffff8880b903b30b R09: 1ffff11017207661 R10: dffffc0000000000 R11: ffffed1017207662 R12: 0000000000000000 R13: 0000200000000314 R14: 0000200000000300 R15: 0000000000000000 bpf_check_uarg_tail_zero kernel/bpf/syscall.c:94 [inline] __sys_bpf+0x19a/0x6f0 kernel/bpf/syscall.c:4623 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f752d849159 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:00007f752ba5f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f752dad1180 RCX: 00007f752d849159 RDX: 0000000000000094 RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007f752d8e003b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f752dad1218 R14: 00007f752dad1180 R15: 00007ffcc3209428 ---------------- Code disassembly (best guess): 0: 00 4c 89 e7 add %cl,-0x19(%rcx,%rcx,4) 4: 4c 89 ee mov %r13,%rsi 7: e8 86 6b 90 fd call 0xfd906b92 c: 48 89 d8 mov %rbx,%rax f: 4c 01 f0 add %r14,%rax 12: 0f 82 e0 00 00 00 jb 0xf8 18: 4c 39 e0 cmp %r12,%rax 1b: 0f 87 d7 00 00 00 ja 0xf8 21: 0f 01 cb stac 24: 0f ae e8 lfence 27: 4d 8b 26 mov (%r14),%r12 * 2a: 42 8d 0c fd 00 00 00 lea 0x0(,%r15,8),%ecx <-- trapping instruction 31: 00 32: 49 d3 ec shr %cl,%r12 35: 49 d3 e4 shl %cl,%r12 38: bf 08 00 00 00 mov $0x8,%edi 3d: 48 89 de mov %rbx,%rsi