================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.4.10810/10520 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8d24fc38 (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+0x19f/0x400 kernel/locking/lockdep.c:5737 __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:2527 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x804/0x9e0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1927 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: 2966 hardirqs last enabled at (2965): [] seqcount_lockdep_reader_access+0x106/0x190 include/linux/seqlock.h:105 hardirqs last disabled at (2966): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (2966): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (2954): [] lock_sock include/net/sock.h:1744 [inline] softirqs last enabled at (2954): [] rawv6_sendmsg+0x11d0/0x1710 net/ipv6/raw.c:921 softirqs last disabled at (2952): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (2952): [] lock_sock_nested+0x68/0x100 net/core/sock.c:3261 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(kernfs_rename_lock); lock(kernfs_rename_lock); *** DEADLOCK *** 1 lock held by syz.4.10810/10520: #0: ffff88807a4d0860 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline] #0: ffff88807a4d0860 (sk_lock-AF_INET6){+.+.}-{0:0}, at: rawv6_sendmsg+0x11d0/0x1710 net/ipv6/raw.c:921 stack backtrace: CPU: 1 PID: 10520 Comm: syz.4.10810 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 lock_acquire+0x2c3/0x400 kernel/locking/lockdep.c:5728 __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+0x21/0x138 bpf_dispatcher_nop_func include/linux/bpf.h:890 [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:10309 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9527 perf_bp_event+0x276/0x320 kernel/events/core.c:10496 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:csum_partial_copy_generic+0x6f/0x1e0 arch/x86/lib/csum-copy_64.S:93 Code: 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 1f 4c 8b 47 08 4c 8b 5f 10 48 8b 57 18 4c 8b 57 20 4c 8b 7f 28 4c 8b 77 30 4c 8b 6f 38 <0f> 18 8f 40 01 00 00 48 11 d8 4c 11 c0 4c 11 d8 48 11 d0 4c 11 d0 RSP: 0018:ffffc90002f5f218 EFLAGS: 00040206 RAX: 000061db0658c24b RBX: 0000000000001590 RCX: 0000000000008000 RDX: 0000000000000004 RSI: ffff8880452982c0 RDI: 0000200000001908 RBP: 0000200000009648 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000300000008 R12: 00000000000001f5 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 csum_and_copy_from_user+0xdf/0x120 arch/x86/lib/csum-wrappers_64.c:31 csum_and_copy_from_iter+0x241/0x1150 lib/iov_iter.c:1706 csum_and_copy_from_iter_full include/linux/uio.h:302 [inline] ip_generic_getfrag+0x14f/0x2d0 net/ipv4/ip_output.c:954 __ip6_append_data+0x1ba7/0x38f0 net/ipv6/ip6_output.c:1713 ip6_append_data+0x1d4/0x310 net/ipv6/ip6_output.c:1778 rawv6_sendmsg+0x1220/0x1710 net/ipv6/raw.c:922 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500 __sys_sendmsg net/socket.c:2529 [inline] __do_sys_sendmsg net/socket.c:2538 [inline] __se_sys_sendmsg+0x1b7/0x2a0 net/socket.c:2536 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: 0033:0x7f4693711559 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:00007f4691968028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4693997fa0 RCX: 00007f4693711559 RDX: 0000000000000060 RSI: 0000200000000880 RDI: 000000000000000f RBP: 00007f46937a8b50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4693998038 R14: 00007f4693997fa0 R15: 00007fff93f3de78 ---------------- Code disassembly (best guess): 0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 7: 00 8: 0f 1f 00 nopl (%rax) b: 48 8b 1f mov (%rdi),%rbx e: 4c 8b 47 08 mov 0x8(%rdi),%r8 12: 4c 8b 5f 10 mov 0x10(%rdi),%r11 16: 48 8b 57 18 mov 0x18(%rdi),%rdx 1a: 4c 8b 57 20 mov 0x20(%rdi),%r10 1e: 4c 8b 7f 28 mov 0x28(%rdi),%r15 22: 4c 8b 77 30 mov 0x30(%rdi),%r14 26: 4c 8b 6f 38 mov 0x38(%rdi),%r13 * 2a: 0f 18 8f 40 01 00 00 prefetcht0 0x140(%rdi) <-- trapping instruction 31: 48 11 d8 adc %rbx,%rax 34: 4c 11 c0 adc %r8,%rax 37: 4c 11 d8 adc %r11,%rax 3a: 48 11 d0 adc %rdx,%rax 3d: 4c 11 d0 adc %r10,%rax