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From:   Andrey Konovalov <andreyknvl@google.com>
Date:   Mon, 9 Mar 2020 16:29:20 +0100
Message-ID: <CAAeHK+zYpO8-GpqdDwfXEyS7VOBvM3dB9QE_DuGfQXqN1ZNwYA@mail.gmail.com>
Subject: Re: WARNING in _chaoskey_fill/usb_submit_urb
To:     syzbot <syzbot+f5349b421c6213d34ce2@syzkaller.appspotmail.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        LKML <linux-kernel@vger.kernel.org>,
        USB list <linux-usb@vger.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>
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On Mon, Sep 23, 2019 at 4:31 PM syzbot
<syzbot+f5349b421c6213d34ce2@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    e0bd8d79 usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=1452c6a1600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8847e5384a16f66a
> dashboard link: https://syzkaller.appspot.com/bug?extid=f5349b421c6213d34ce2
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16342d45600000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=166769b1600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+f5349b421c6213d34ce2@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> URB 00000000052bee21 submitted while active
> WARNING: CPU: 1 PID: 1794 at drivers/usb/core/urb.c:362
> usb_submit_urb+0x10c1/0x13b0 drivers/usb/core/urb.c:362
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 1794 Comm: syz-executor305 Not tainted 5.3.0+ #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+0xca/0x13e lib/dump_stack.c:113
>   panic+0x2a3/0x6da kernel/panic.c:219
>   __warn.cold+0x20/0x4a kernel/panic.c:576
>   report_bug+0x262/0x2a0 lib/bug.c:186
>   fixup_bug arch/x86/kernel/traps.c:179 [inline]
>   fixup_bug arch/x86/kernel/traps.c:174 [inline]
>   do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
>   do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
>   invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
> RIP: 0010:usb_submit_urb+0x10c1/0x13b0 drivers/usb/core/urb.c:362
> Code: 89 de e8 92 5b ee fd 84 db 0f 85 42 f6 ff ff e8 55 5a ee fd 4c 89 fe
> 48 c7 c7 00 c2 18 86 c6 05 f3 cf 38 04 01 e8 f4 e5 c3 fd <0f> 0b e9 20 f6
> ff ff c7 44 24 14 01 00 00 00 e9 d7 f6 ff ff 41 bd
> RSP: 0018:ffff8881d0427b68 EFLAGS: 00010286
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff8128d9ad RDI: ffffed103a084f5f
> RBP: ffff8881d070b180 R08: ffff8881d4934800 R09: ffffed103b663ee7
> R10: ffffed103b663ee6 R11: ffff8881db31f737 R12: ffff8881d070b180
> R13: 00000000fffffff0 R14: 0000000000000000 R15: ffff8881d5c22400
>   _chaoskey_fill.part.0+0xe0/0x470 drivers/usb/misc/chaoskey.c:367
>   _chaoskey_fill+0x1ad/0x230 drivers/usb/misc/chaoskey.c:361
>   chaoskey_read+0x2c2/0x4c0 drivers/usb/misc/chaoskey.c:434
>   __vfs_read+0x76/0x100 fs/read_write.c:425
>   vfs_read+0x1ea/0x430 fs/read_write.c:461
>   ksys_read+0x127/0x250 fs/read_write.c:587
>   do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x4419c9
> Code: e8 8c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 cb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007ffc317ed1f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004419c9
> RDX: 0000000000000009 RSI: 0000000020000040 RDI: 0000000000000004
> RBP: 000000000000e12e R08: 000000000000000f R09: 00000000004002c8
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402720
> R13: 00000000004027b0 R14: 0000000000000000 R15: 0000000000000000
> 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

#syz fix: USB: chaoskey: fix error case of a timeout