================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.7.2721/18519 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8c44fe18 (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: 10194 hardirqs last enabled at (10193): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 hardirqs last disabled at (10194): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (10194): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (10154): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last enabled at (10154): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last enabled at (10154): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 softirqs last disabled at (10045): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (10045): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last disabled at (10045): [] __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.7.2721/18519. stack backtrace: CPU: 0 PID: 18519 Comm: syz.7.2721 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+0x21/0x214 bpf_dispatcher_nop_func include/linux/bpf.h:889 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_overflow_handler+0x1c2/0x4a0 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:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:92 Code: 38 4c 89 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a RSP: 0018:ffffc9000341faa8 EFLAGS: 00040202 RAX: ffffffff83e89c01 RBX: 0000000000000010 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000200000000300 RDI: ffffc9000341fcc0 RBP: 0000000000000000 R08: 00002000000000c0 R09: 1ffff92000683f99 R10: dffffc0000000000 R11: fffff52000683f9a R12: 00007ffffffff000 R13: 0000200000000310 R14: ffffc9000341fcc0 R15: 0000200000000300 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+0xfa/0x170 lib/usercopy.c:23 copy_from_user include/linux/uaccess.h:192 [inline] copy_iovec_from_user lib/iov_iter.c:1892 [inline] iovec_from_user+0x142/0x370 lib/iov_iter.c:1927 __import_iovec+0x70/0x490 lib/iov_iter.c:1945 import_iovec+0x6f/0xa0 lib/iov_iter.c:2010 copy_msghdr_from_user net/socket.c:2384 [inline] recvmsg_copy_msghdr net/socket.c:2631 [inline] ___sys_recvmsg+0x4e2/0x5c0 net/socket.c:2703 __sys_recvmsg net/socket.c:2737 [inline] __do_sys_recvmsg net/socket.c:2747 [inline] __se_sys_recvmsg net/socket.c:2744 [inline] __x64_sys_recvmsg+0x201/0x2d0 net/socket.c:2744 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: 0033:0x7ff9b7735159 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:00007ff9b598d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007ff9b79bcfa0 RCX: 00007ff9b7735159 RDX: 0000000040000140 RSI: 00002000000003c0 RDI: 000000000000000e RBP: 00007ff9b77cc024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff9b79bd038 R14: 00007ff9b79bcfa0 R15: 00007ffd35ea4f48 ---------------- Code disassembly (best guess): 0: 38 4c 89 47 cmp %cl,0x47(%rcx,%rcx,4) 4: 20 4c 89 4f and %cl,0x4f(%rcx,%rcx,4) 8: 28 4c 89 57 sub %cl,0x57(%rcx,%rcx,4) c: 30 4c 89 5f xor %cl,0x5f(%rcx,%rcx,4) 10: 38 48 8d cmp %cl,-0x73(%rax) 13: 76 40 jbe 0x55 15: 48 8d 7f 40 lea 0x40(%rdi),%rdi 19: ff c9 dec %ecx 1b: 75 b6 jne 0xffffffd3 1d: 89 d1 mov %edx,%ecx 1f: 83 e2 07 and $0x7,%edx 22: c1 e9 03 shr $0x3,%ecx 25: 74 12 je 0x39 27: 4c 8b 06 mov (%rsi),%r8 * 2a: 4c 89 07 mov %r8,(%rdi) <-- trapping instruction 2d: 48 8d 76 08 lea 0x8(%rsi),%rsi 31: 48 8d 7f 08 lea 0x8(%rdi),%rdi 35: ff c9 dec %ecx 37: 75 ee jne 0x27 39: 21 d2 and %edx,%edx 3b: 74 10 je 0x4d 3d: 89 d1 mov %edx,%ecx 3f: 8a .byte 0x8a