Subject: [syzbot] usb-testing boot error: BUG: unable to handle kernel paging request in virtnet_set_affinity

From: syzbot <[email-masked]>
Date: Mon, 22 Aug 2022 12:48:32 -0700

Hello,

syzbot found the following issue on:

HEAD commit:    ad57410d231d usb: gadget: rndis: use %u instead of %d to p..
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=17472b85080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3cb39b084894e9a5
dashboard link: https://syzkaller.appspot.com/bug?extid=0cb3309ee74d3c0c431c
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: [email-masked]

PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
software IO TLB: mapped [mem 0x00000000bbffd000-0x00000000bfffd000] (64MB)
RAPL PMU: API unit is 2^-32 Joules, 0 fixed counters, 10737418240 ms ovfl timer
clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x1fb6feccdd0, max_idle_ns: 440795259471 ns
clocksource: Switched to clocksource tsc
Initialise system trusted keyrings
workingset: timestamp_bits=40 max_order=21 bucket_order=0
NFS: Registering the id_resolver key type
Key type id_resolver registered
Key type id_legacy registered
9p: Installing v9fs 9p2000 file system support
Key type asymmetric registered
Asymmetric key parser 'x509' registered
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 246)
io scheduler mq-deadline registered
io scheduler kyber registered
usbcore: registered new interface driver udlfb
usbcore: registered new interface driver smscufx
input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
ACPI: button: Power Button [PWRF]
input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input1
ACPI: button: Sleep Button [SLPF]
ACPI: \_SB_.LNKC: Enabled at IRQ 11
virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver
ACPI: \_SB_.LNKD: Enabled at IRQ 10
virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver
ACPI: \_SB_.LNKB: Enabled at IRQ 10
virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver
virtio-pci 0000:00:07.0: virtio_pci: leaving for legacy driver
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
00:05: ttyS2 at I/O 0x3e8 (irq = 6, base_baud = 115200) is a 16550A
00:06: ttyS3 at I/O 0x2e8 (irq = 7, base_baud = 115200) is a 16550A
Non-volatile memory driver v1.3
Linux agpgart interface v0.103
ACPI: bus type drm_connector registered
usbcore: registered new interface driver udl
loop: module loaded
usbcore: registered new interface driver rtsx_usb
usbcore: registered new interface driver viperboard
usbcore: registered new interface driver dln2
usbcore: registered new interface driver pn533_usb
usbcore: registered new interface driver port100
usbcore: registered new interface driver nfcmrvl
scsi host0: Virtio SCSI HBA
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
BUG: unable to handle page fault for address: ffffdc0000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 100026067 P4D 100026067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.0.0-rc1-syzkaller-00005-gad57410d231d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:virtnet_set_affinity+0x2e4/0x600 drivers/net/virtio_net.c:2303
Code: e8 03 42 80 3c 30 00 0f 85 de 02 00 00 48 8b 44 24 10 48 8d 1c 80 48 8b 44 24 18 48 c1 e3 08 48 03 58 20 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 a9 02 00 00 4c 8b 23 49 8d 7c 24 20 48 89 f8
RSP: 0000:ffffc9000001f980 EFLAGS: 00010a06
RAX: 1fffe00000000000 RBX: ffff000000000000 RCX: 0000000000000000
RDX: ffff8881002a8000 RSI: ffffffff82fd75e3 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffc9000001f9f8
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000000 CR3: 0000000007825000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 init_vqs drivers/net/virtio_net.c:3611 [inline]
 init_vqs drivers/net/virtio_net.c:3597 [inline]
 virtnet_probe+0x11ed/0x30f0 drivers/net/virtio_net.c:3904
 virtio_dev_probe+0x577/0x870 drivers/virtio/virtio.c:305
 call_driver_probe drivers/base/dd.c:530 [inline]
 really_probe+0x249/0xb90 drivers/base/dd.c:609
 __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:748
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:778
 __driver_attach+0x223/0x550 drivers/base/dd.c:1150
 bus_for_each_dev+0x147/0x1d0 drivers/base/bus.c:301
 bus_add_driver+0x4c9/0x640 drivers/base/bus.c:618
 driver_register+0x220/0x3a0 drivers/base/driver.c:240
 virtio_net_driver_init+0x93/0xd2 drivers/net/virtio_net.c:4108
 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:
CR2: ffffdc0000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:virtnet_set_affinity+0x2e4/0x600 drivers/net/virtio_net.c:2303
Code: e8 03 42 80 3c 30 00 0f 85 de 02 00 00 48 8b 44 24 10 48 8d 1c 80 48 8b 44 24 18 48 c1 e3 08 48 03 58 20 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 a9 02 00 00 4c 8b 23 49 8d 7c 24 20 48 89 f8
RSP: 0000:ffffc9000001f980 EFLAGS: 00010a06
RAX: 1fffe00000000000 RBX: ffff000000000000 RCX: 0000000000000000
RDX: ffff8881002a8000 RSI: ffffffff82fd75e3 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffc9000001f9f8
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000000 CR3: 0000000007825000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 03 42 80 3c       	callq  0x3c804208
   5:	30 00                	xor    %al,(%rax)
   7:	0f 85 de 02 00 00    	jne    0x2eb
   d:	48 8b 44 24 10       	mov    0x10(%rsp),%rax
  12:	48 8d 1c 80          	lea    (%rax,%rax,4),%rbx
  16:	48 8b 44 24 18       	mov    0x18(%rsp),%rax
  1b:	48 c1 e3 08          	shl    $0x8,%rbx
  1f:	48 03 58 20          	add    0x20(%rax),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	0f 85 a9 02 00 00    	jne    0x2de
  35:	4c 8b 23             	mov    (%rbx),%r12
  38:	49 8d 7c 24 20       	lea    0x20(%r12),%rdi
  3d:	48 89 f8             	mov    %rdi,%rax

---
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 [email-masked].

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.