linux-kernel - Re: [syzbot] [usb?] INFO: rcu detected stall in raw

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Date: Sat, 8 Jun 2024 21:57:25 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: syzbot <syzbot+5f996b83575ef4058638@...kaller.appspotmail.com>
Cc: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
  linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] INFO: rcu detected stall in raw_ioctl

On Sat, Jun 08, 2024 at 05:28:26PM -0700, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    8867bbd4a056 mm: arm64: Fix the out-of-bounds issue in con..
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=10961932980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3b4350cf56c61c80
> dashboard link: https://syzkaller.appspot.com/bug?extid=5f996b83575ef4058638
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15be6dce980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=101ca30a980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/6ea21f50498b/disk-8867bbd4.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/e2fed09364aa/vmlinux-8867bbd4.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/4860173c7a18/Image-8867bbd4.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+5f996b83575ef4058638@...kaller.appspotmail.com
> 
> cdc_wdm 1-1:1.0: nonzero urb status received: -71
> cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
> cdc_wdm 1-1:1.0: nonzero urb status received: -71
> cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
> watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor782:6625]

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git 8867bbd4a056

Index: usb-devel/drivers/usb/class/cdc-wdm.c
===================================================================
--- usb-devel.orig/drivers/usb/class/cdc-wdm.c
+++ usb-devel/drivers/usb/class/cdc-wdm.c
@@ -260,6 +260,9 @@ static void wdm_int_callback(struct urb
 		case -ESHUTDOWN:
 		case -ENOENT:
 		case -ECONNRESET:
+		case -EPROTO:
+		case -EILSEQ:
+		case -ETIME:
 			return; /* unplug */
 		case -EPIPE:
 			set_bit(WDM_INT_STALL, &desc->flags);