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    SubjectKMSAN: uninit-value in digitv_rc_query
    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=16860a63600000
    kernel config: https://syzkaller.appspot.com/x/.config?x=f03c659d0830ab8d
    dashboard link: https://syzkaller.appspot.com/bug?extid=6bf9606ee955b646c0e1
    compiler: clang version 9.0.0 (/home/glider/llvm/clang
    80fee25776c2fb61e74c1ecb1a523375c2500b69)
    syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c1101b600000
    C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15db3cfd600000

    IMPORTANT: if you fix the bug, please add the following tag to the commit:
    Reported-by: syzbot+6bf9606ee955b646c0e1@syzkaller.appspotmail.com

    dvb-usb: schedule remote query interval to 1000 msecs.
    dvb-usb: Nebula Electronics uDigiTV DVB-T USB2.0) successfully initialized
    and connected.
    dvb-usb: bulk message failed: -22 (7/0)
    dvb-usb: bulk message failed: -22 (7/0)
    dvb-usb: bulk message failed: -22 (7/-30591)
    dvb-usb: bulk message failed: -22 (7/0)
    =====================================================
    BUG: KMSAN: uninit-value in legacy_dvb_usb_read_remote_control+0x106/0x790
    drivers/media/usb/dvb-usb/dvb-usb-remote.c:123
    CPU: 1 PID: 3844 Comm: kworker/1:2 Not tainted 5.3.0-rc7+ #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
    Google 01/01/2011
    Workqueue: events legacy_dvb_usb_read_remote_control
    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
    digitv_rc_query+0x76a/0x890 drivers/media/usb/dvb-usb/digitv.c:259
    legacy_dvb_usb_read_remote_control+0x106/0x790
    drivers/media/usb/dvb-usb/dvb-usb-remote.c:123
    process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
    worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
    kthread+0x4b5/0x4f0 kernel/kthread.c:256
    ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

    Local variable description: ----key@digitv_rc_query
    Variable was created at:
    digitv_rc_query+0x78/0x890 drivers/media/usb/dvb-usb/digitv.c:234
    legacy_dvb_usb_read_remote_control+0x106/0x790
    drivers/media/usb/dvb-usb/dvb-usb-remote.c:123
    =====================================================
    Kernel panic - not syncing: panic_on_warn set ...
    CPU: 1 PID: 3844 Comm: kworker/1:2 Tainted: G B 5.3.0-rc7+ #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
    Google 01/01/2011
    Workqueue: events legacy_dvb_usb_read_remote_control
    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
    digitv_rc_query+0x76a/0x890 drivers/media/usb/dvb-usb/digitv.c:259
    legacy_dvb_usb_read_remote_control+0x106/0x790
    drivers/media/usb/dvb-usb/dvb-usb-remote.c:123
    process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
    worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
    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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