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    Date
    SubjectWARNING in kernfs_add_one
    From
    Hello,

    syzbot found the following crash on:

    HEAD commit: 8fb11a9a8d51 net/ipv6: rename rt6_next to fib6_next
    git tree: net-next
    console output: https://syzkaller.appspot.com/x/log.txt?x=14b27237800000
    kernel config: https://syzkaller.appspot.com/x/.config?x=c416c61f3cd96be
    dashboard link: https://syzkaller.appspot.com/bug?extid=df47f81c226b31d89fb1
    compiler: gcc (GCC) 8.0.1 20180413 (experimental)
    syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=172fb3e7800000
    C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16552e57800000

    IMPORTANT: if you fix the bug, please add the following tag to the commit:
    Reported-by: syzbot+df47f81c226b31d89fb1@syzkaller.appspotmail.com

    RBP: 00007fff808f3e10 R08: 0000000000000002 R09: 00007fff80003534
    R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
    R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000000000
    ------------[ cut here ]------------
    kernfs: ns required in 'ieee80211' for 'phy3'
    WARNING: CPU: 0 PID: 4538 at fs/kernfs/dir.c:759 kernfs_add_one+0x406/0x4d0
    fs/kernfs/dir.c:758
    Kernel panic - not syncing: panic_on_warn set ...

    CPU: 0 PID: 4538 Comm: syz-executor486 Not tainted 4.17.0-rc3+ #33
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
    Google 01/01/2011
    Call Trace:
    __dump_stack lib/dump_stack.c:77 [inline]
    dump_stack+0x1b9/0x294 lib/dump_stack.c:113
    panic+0x22f/0x4de kernel/panic.c:184
    __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
    report_bug+0x252/0x2d0 lib/bug.c:186
    fixup_bug arch/x86/kernel/traps.c:178 [inline]
    do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
    do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
    invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
    RIP: 0010:kernfs_add_one+0x406/0x4d0 fs/kernfs/dir.c:758
    RSP: 0018:ffff8801ca9eece0 EFLAGS: 00010286
    RAX: 000000000000002d RBX: ffffffff87d5cee0 RCX: ffffffff8160ba7d
    RDX: 0000000000000000 RSI: ffffffff81610731 RDI: ffff8801ca9ee840
    RBP: ffff8801ca9eed20 R08: ffff8801d9538500 R09: 0000000000000006
    R10: ffff8801d9538500 R11: 0000000000000000 R12: ffff8801ad1cb6c0
    R13: ffffffff885da640 R14: 0000000000000020 R15: 0000000000000000
    kernfs_create_link+0x112/0x180 fs/kernfs/symlink.c:41
    sysfs_do_create_link_sd.isra.2+0x90/0x130 fs/sysfs/symlink.c:43
    sysfs_do_create_link fs/sysfs/symlink.c:79 [inline]
    sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:91
    device_add_class_symlinks drivers/base/core.c:1612 [inline]
    device_add+0x7a0/0x16d0 drivers/base/core.c:1810
    wiphy_register+0x178a/0x2430 net/wireless/core.c:806
    ieee80211_register_hw+0x13cd/0x35d0 net/mac80211/main.c:1047
    mac80211_hwsim_new_radio+0x1d9b/0x3410
    drivers/net/wireless/mac80211_hwsim.c:2772
    hwsim_new_radio_nl+0x7a7/0xa60 drivers/net/wireless/mac80211_hwsim.c:3246
    genl_family_rcv_msg+0x889/0x1120 net/netlink/genetlink.c:599
    genl_rcv_msg+0xc6/0x170 net/netlink/genetlink.c:624
    netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448
    genl_rcv+0x28/0x40 net/netlink/genetlink.c:635
    netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
    netlink_unicast+0x58b/0x740 net/netlink/af_netlink.c:1336
    netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901
    sock_sendmsg_nosec net/socket.c:629 [inline]
    sock_sendmsg+0xd5/0x120 net/socket.c:639
    ___sys_sendmsg+0x805/0x940 net/socket.c:2117
    __sys_sendmsg+0x115/0x270 net/socket.c:2155
    __do_sys_sendmsg net/socket.c:2164 [inline]
    __se_sys_sendmsg net/socket.c:2162 [inline]
    __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
    do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
    entry_SYSCALL_64_after_hwframe+0x49/0xbe
    RIP: 0033:0x4404c9
    RSP: 002b:00007fff808f3e08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
    RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004404c9
    RDX: 0000000000000000 RSI: 0000000020b3dfc8 RDI: 0000000000000005
    RBP: 00007fff808f3e10 R08: 0000000000000002 R09: 00007fff80003534
    R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
    R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000000000
    Dumping ftrace buffer:
    (ftrace buffer empty)
    Kernel Offset: disabled
    Rebooting in 86400 seconds..


    ---
    This bug is generated by a bot. It may contain errors.
    See https://goo.gl/tpsmEJ for more information about syzbot.
    syzbot engineers can be reached at syzkaller@googlegroups.com.

    syzbot will keep track of this bug report.
    If you forgot to add the Reported-by tag, once the fix for this bug is
    merged
    into any tree, please reply to this email with:
    #syz fix: exact-commit-title
    If you want to test a patch for this bug, please reply with:
    #syz test: git://repo/address.git branch
    and provide the patch inline or as an attachment.
    To mark this as a duplicate of another syzbot report, please reply with:
    #syz dup: exact-subject-of-another-report
    If it's a one-off invalid bug report, please reply with:
    #syz invalid
    Note: if the crash happens again, it will cause creation of a new bug
    report.
    Note: all commands must start from beginning of the line in the email body.

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