linux-kernel - Re: [syzbot] usb-testing boot error: general protection fault in __tty_alloc

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Message-ID: <20220815180801.GA3126580@roeck-us.net>
Date:   Mon, 15 Aug 2022 11:08:01 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     syzbot <syzbot+2c35c4d66094ddfe198e@...kaller.appspotmail.com>
Cc:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] usb-testing boot error: general protection fault in
 __tty_alloc_driver

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git  fc4d146e8d7d25ef88d409bea1f2e9aff7f30635

On Mon, Aug 15, 2022 at 11:01:30AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    568035b01cfb Linux 6.0-rc1
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> console output: https://syzkaller.appspot.com/x/log.txt?x=15271a0d080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3cb39b084894e9a5
> dashboard link: https://syzkaller.appspot.com/bug?extid=2c35c4d66094ddfe198e
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+2c35c4d66094ddfe198e@...kaller.appspotmail.com
> 
> scsi 0:0:1:0: Direct-Access     Google   PersistentDisk   1    PQ: 0 ANSI: 6
> sd 0:0:1:0: Attached scsi generic sg0 type 0
> Rounding down aligned max_sectors from 4294967295 to 4294967288
> db_root: cannot open: /etc/target
> CAN device driver interface
> usbcore: registered new interface driver usb_8dev
> usbcore: registered new interface driver ems_usb
> usbcore: registered new interface driver gs_usb
> usbcore: registered new interface driver kvaser_usb
> usbcore: registered new interface driver mcba_usb
> usbcore: registered new interface driver peak_usb
> e100: Intel(R) PRO/100 Network Driver
> e100: Copyright(c) 1999-2006 Intel Corporation
> e1000: Intel(R) PRO/1000 Network Driver
> e1000: Copyright (c) 1999-2006 Intel Corporation.
> e1000e: Intel(R) PRO/1000 Network Driver
> e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
> sky2: driver version 1.30
> usbcore: registered new interface driver ath9k_htc
> usbcore: registered new interface driver carl9170
> usbcore: registered new interface driver ath6kl_usb
> usbcore: registered new interface driver ar5523
> usbcore: registered new interface driver ath10k_usb
> Atmel at76x USB Wireless LAN Driver 0.17 loading
> usbcore: registered new interface driver at76c50x-usb
> usbcore: registered new interface driver brcmfmac
> usbcore: registered new interface driver orinoco_usb
> usbcore: registered new interface driver p54usb
> usbcore: registered new interface driver usb8xxx
> usbcore: registered new interface driver lbtf_usb
> usbcore: registered new interface driver mwifiex_usb
> usbcore: registered new interface driver mt7601u
> usbcore: registered new interface driver rt2500usb
> usbcore: registered new interface driver rt73usb
> usbcore: registered new interface driver rt2800usb
> usbcore: registered new interface driver rtl8187
> usbcore: registered new interface driver rtl8192cu
> usbcore: registered new interface driver rtl8xxxu
> usbcore: registered new interface driver RSI-USB WLAN
> usbcore: registered new interface driver zd1211rw
> usbcore: registered new interface driver zd1201
> usbcore: registered new interface driver rndis_wlan
> usbcore: registered new interface driver atusb
> usbcore: registered new interface driver catc
> usbcore: registered new interface driver kaweth
> pegasus: Pegasus/Pegasus II USB Ethernet driver
> usbcore: registered new interface driver pegasus
> usbcore: registered new interface driver rtl8150
> usbcore: registered new interface driver r8152
> hso: drivers/net/usb/hso.c: Option Wireless
> general protection fault, probably for non-canonical address 0xffff080000000400: 0000 [#1] PREEMPT SMP KASAN
> KASAN: maybe wild-memory-access in range [0xfff8600000002000-0xfff8600000002007]
> CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.0.0-rc1-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
> RIP: 0010:freelist_dereference mm/slub.c:347 [inline]
> RIP: 0010:get_freepointer mm/slub.c:354 [inline]
> RIP: 0010:get_freepointer_safe mm/slub.c:368 [inline]
> RIP: 0010:slab_alloc_node mm/slub.c:3211 [inline]
> RIP: 0010:slab_alloc mm/slub.c:3251 [inline]
> RIP: 0010:__kmalloc+0x10e/0x320 mm/slub.c:4420
> Code: 8b 51 08 48 8b 01 48 83 79 10 00 48 89 44 24 08 0f 84 dc 01 00 00 48 85 c0 0f 84 d3 01 00 00 48 8b 7d 00 8b 4d 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 df 01 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0
> RSP: 0000:ffffc9000001fd58 EFLAGS: 00010246
> RAX: ffff080000000000 RBX: 0000000000000100 RCX: 0000000000000400
> RDX: 0000000000001899 RSI: 0000000000000dc0 RDI: 000000000003b420
> RBP: ffff888100042000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000dc0
> R13: 0000000000000800 R14: 0000000000000dc0 R15: 0000000000000000
> FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 0000000007825000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  kmalloc_array include/linux/slab.h:640 [inline]
>  kcalloc include/linux/slab.h:671 [inline]
>  __tty_alloc_driver drivers/tty/tty_io.c:3358 [inline]
>  __tty_alloc_driver+0x1ea/0x510 drivers/tty/tty_io.c:3317
>  hso_init+0x98/0x44e drivers/net/usb/hso.c:3247
>  do_one_initcall+0xfe/0x650 init/main.c:1296
>  do_initcall_level init/main.c:1369 [inline]
>  do_initcalls init/main.c:1385 [inline]
>  do_basic_setup init/main.c:1404 [inline]
>  kernel_init_freeable+0x6ac/0x735 init/main.c:1611
>  kernel_init+0x1a/0x1d0 init/main.c:1500
>  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
>  </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:freelist_dereference mm/slub.c:347 [inline]
> RIP: 0010:get_freepointer mm/slub.c:354 [inline]
> RIP: 0010:get_freepointer_safe mm/slub.c:368 [inline]
> RIP: 0010:slab_alloc_node mm/slub.c:3211 [inline]
> RIP: 0010:slab_alloc mm/slub.c:3251 [inline]
> RIP: 0010:__kmalloc+0x10e/0x320 mm/slub.c:4420
> Code: 8b 51 08 48 8b 01 48 83 79 10 00 48 89 44 24 08 0f 84 dc 01 00 00 48 85 c0 0f 84 d3 01 00 00 48 8b 7d 00 8b 4d 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 df 01 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0
> RSP: 0000:ffffc9000001fd58 EFLAGS: 00010246
> RAX: ffff080000000000 RBX: 0000000000000100 RCX: 0000000000000400
> RDX: 0000000000001899 RSI: 0000000000000dc0 RDI: 000000000003b420
> RBP: ffff888100042000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000dc0
> R13: 0000000000000800 R14: 0000000000000dc0 R15: 0000000000000000
> FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 0000000007825000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess):
>    0:	8b 51 08             	mov    0x8(%rcx),%edx
>    3:	48 8b 01             	mov    (%rcx),%rax
>    6:	48 83 79 10 00       	cmpq   $0x0,0x10(%rcx)
>    b:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
>   10:	0f 84 dc 01 00 00    	je     0x1f2
>   16:	48 85 c0             	test   %rax,%rax
>   19:	0f 84 d3 01 00 00    	je     0x1f2
>   1f:	48 8b 7d 00          	mov    0x0(%rbp),%rdi
>   23:	8b 4d 28             	mov    0x28(%rbp),%ecx
>   26:	40 f6 c7 0f          	test   $0xf,%dil
> * 2a:	48 8b 1c 08          	mov    (%rax,%rcx,1),%rbx <-- trapping instruction
>   2e:	0f 85 df 01 00 00    	jne    0x213
>   34:	48 8d 4a 08          	lea    0x8(%rdx),%rcx
>   38:	65 48 0f c7 0f       	cmpxchg16b %gs:(%rdi)
>   3d:	0f 94 c0             	sete   %al
> 
> 
> ---
> This report 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@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.