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    SubjectKMSAN: uninit-value in alauda_check_media
    From
    Hello,

    syzbot found the following crash on:

    HEAD commit: 1e76a3e5 kmsan: replace __GFP_NO_KMSAN_SHADOW with kmsan_i..
    git tree: https://github.com/google/kmsan.git master
    console output: https://syzkaller.appspot.com/x/log.txt?x=1204cc63600000
    kernel config: https://syzkaller.appspot.com/x/.config?x=f03c659d0830ab8d
    dashboard link: https://syzkaller.appspot.com/bug?extid=e7d46eb426883fb97efd
    compiler: clang version 9.0.0 (/home/glider/llvm/clang
    80fee25776c2fb61e74c1ecb1a523375c2500b69)
    syz repro: https://syzkaller.appspot.com/x/repro.syz?x=123c860d600000
    C reproducer: https://syzkaller.appspot.com/x/repro.c?x=110631b7600000

    IMPORTANT: if you fix the bug, please add the following tag to the commit:
    Reported-by: syzbot+e7d46eb426883fb97efd@syzkaller.appspotmail.com

    =====================================================
    BUG: KMSAN: uninit-value in alauda_transport+0x462/0x57f0
    drivers/usb/storage/alauda.c:1137
    CPU: 0 PID: 12279 Comm: usb-storage Not tainted 5.3.0-rc7+ #0
    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+0x191/0x1f0 lib/dump_stack.c:113
    kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108
    __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
    alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:460
    alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
    usb_stor_invoke_transport+0xf5/0x27e0 drivers/usb/storage/transport.c:606
    usb_stor_transparent_scsi_command+0x5d/0x70
    drivers/usb/storage/protocol.c:108
    usb_stor_control_thread+0xca6/0x11a0 drivers/usb/storage/usb.c:380
    kthread+0x4b5/0x4f0 kernel/kthread.c:256
    ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

    Local variable description: ----status@alauda_check_media
    Variable was created at:
    alauda_check_media+0x8e/0x3310 drivers/usb/storage/alauda.c:454
    alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
    =====================================================
    Kernel panic - not syncing: panic_on_warn set ...
    CPU: 0 PID: 12279 Comm: usb-storage Tainted: G B 5.3.0-rc7+
    #0
    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+0x191/0x1f0 lib/dump_stack.c:113
    panic+0x3c9/0xc1e kernel/panic.c:219
    kmsan_report+0x2a2/0x2b0 mm/kmsan/kmsan_report.c:131
    __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
    alauda_check_media+0x344/0x3310 drivers/usb/storage/alauda.c:460
    alauda_transport+0x462/0x57f0 drivers/usb/storage/alauda.c:1137
    usb_stor_invoke_transport+0xf5/0x27e0 drivers/usb/storage/transport.c:606
    usb_stor_transparent_scsi_command+0x5d/0x70
    drivers/usb/storage/protocol.c:108
    usb_stor_control_thread+0xca6/0x11a0 drivers/usb/storage/usb.c:380
    kthread+0x4b5/0x4f0 kernel/kthread.c:256
    ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
    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. See:
    https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
    syzbot can test patches for this bug, for details see:
    https://goo.gl/tpsmEJ#testing-patches

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