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Date:   Sat, 24 Nov 2018 11:40:03 -0800
Message-ID: <0000000000001ecaa1057b6e4489@google.com>
Subject: WARNING in csum_and_copy_to_iter
From:   syzbot <syzbot+ce18da013d76d837144d@syzkaller.appspotmail.com>
To:     davem@davemloft.net, gregkh@linuxfoundation.org,
        kgraul@linux.ibm.com, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, stranche@codeaurora.org,
        syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
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Sender: linux-kernel-owner@vger.kernel.org
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Hello,

syzbot found the following crash on:

HEAD commit:    edeca3a769ad Merge tag 'sound-4.20-rc4' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12bee26d400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=73e2bc0cb6463446
dashboard link: https://syzkaller.appspot.com/bug?extid=ce18da013d76d837144d
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15ccd1f5400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ce18da013d76d837144d@syzkaller.appspotmail.com

8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
WARNING: CPU: 1 PID: 7440 at lib/iov_iter.c:1443  
csum_and_copy_to_iter+0x73a/0x14f0 lib/iov_iter.c:1443
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7440 Comm: syz-executor2 Not tainted 4.20.0-rc3+ #345
kobject: 'loop0' (00000000da2348da): kobject_uevent_env
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+0x244/0x39d lib/dump_stack.c:113
  panic+0x2ad/0x55c kernel/panic.c:188
kobject: 'loop0' (00000000da2348da): fill_kobj_path: path  
= '/devices/virtual/block/loop0'
  __warn.cold.8+0x20/0x45 kernel/panic.c:540
  report_bug+0x254/0x2d0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
  do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
WARNING: CPU: 0 PID: 7446 at lib/iov_iter.c:1443  
csum_and_copy_to_iter+0x73a/0x14f0 lib/iov_iter.c:1443
Modules linked in:
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
CPU: 0 PID: 7446 Comm: syz-executor0 Not tainted 4.20.0-rc3+ #345
RIP: 0010:csum_and_copy_to_iter+0x73a/0x14f0 lib/iov_iter.c:1443
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Code: ee fd 48 83 bd b0 fe ff ff 00 0f 84 48 fc ff ff e9 91 fe ff ff e8 e6  
6d ee fd 49 83 c4 10 31 db e9 70 fc ff ff e8 d6 6d ee fd <0f> 0b 48 c7 85  
e8 fe ff ff 00 00 00 00 e9 70 fd ff ff 4c 89 f7 e8
RIP: 0010:csum_and_copy_to_iter+0x73a/0x14f0 lib/iov_iter.c:1443
RSP: 0018:ffff8881bc80f368 EFLAGS: 00010293
Code: ee fd 48 83 bd b0 fe ff ff 00 0f 84 48 fc ff ff e9 91 fe ff ff e8 e6  
6d ee fd 49 83 c4 10 31 db e9 70 fc ff ff e8 d6 6d ee fd <0f> 0b 48 c7 85  
e8 fe ff ff 00 00 00 00 e9 70 fd ff ff 4c 89 f7 e8
RAX: ffff8881c87ca080 RBX: 000000000000038a RCX: ffffffff839116c2
RSP: 0018:ffff8881bbabf368 EFLAGS: 00010293
RDX: 0000000000000000 RSI: ffffffff83911d1a RDI: 0000000000000005
RAX: ffff8881caf18080 RBX: 000000000000038a RCX: ffffffff839116c2
RBP: ffff8881bc80f4f8 R08: ffff8881c87ca080 R09: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff83911d1a RDI: 0000000000000005
R10: 0000000000000000 R11: ffff8881c87ca080 R12: 0000000000000000
RBP: ffff8881bbabf4f8 R08: ffff8881caf18080 R09: 0000000000000006
R13: 0000000000000008 R14: ffff8881bc80fa50 R15: 000000000000038a
R10: 0000000000000000 R11: ffff8881caf18080 R12: 0000000000000000
R13: 0000000000000008 R14: ffff8881bbabfa50 R15: 000000000000038a
FS:  00007fed2599c700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004cce48 CR3: 00000001cf367000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  skb_copy_and_csum_datagram+0x1ab/0xae0 net/core/datagram.c:662
  skb_copy_and_csum_datagram+0x1ab/0xae0 net/core/datagram.c:662
  skb_copy_and_csum_datagram_msg+0x246/0x420 net/core/datagram.c:802
  udpv6_recvmsg+0xd62/0x1d80 net/ipv6/udp.c:376
  skb_copy_and_csum_datagram_msg+0x246/0x420 net/core/datagram.c:802
  udpv6_recvmsg+0xd62/0x1d80 net/ipv6/udp.c:376
  inet_recvmsg+0x181/0x6d0 net/ipv4/af_inet.c:830
  inet_recvmsg+0x181/0x6d0 net/ipv4/af_inet.c:830
  sock_recvmsg_nosec net/socket.c:794 [inline]
  sock_recvmsg+0xd0/0x110 net/socket.c:801
  sock_read_iter+0x39b/0x570 net/socket.c:878
  call_read_iter include/linux/fs.h:1851 [inline]
  generic_file_splice_read+0x5a2/0x9a0 fs/splice.c:308
  sock_recvmsg_nosec net/socket.c:794 [inline]
  sock_recvmsg+0xd0/0x110 net/socket.c:801
  sock_read_iter+0x39b/0x570 net/socket.c:878
  sock_splice_read+0xef/0x110 net/socket.c:856
  do_splice_to+0x12e/0x190 fs/splice.c:880
  call_read_iter include/linux/fs.h:1851 [inline]
  generic_file_splice_read+0x5a2/0x9a0 fs/splice.c:308
  do_splice+0x1014/0x1430 fs/splice.c:1173
  sock_splice_read+0xef/0x110 net/socket.c:856
  __do_sys_splice fs/splice.c:1414 [inline]
  __se_sys_splice fs/splice.c:1394 [inline]
  __x64_sys_splice+0x2c1/0x330 fs/splice.c:1394
  do_splice_to+0x12e/0x190 fs/splice.c:880
  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
  do_splice+0x1014/0x1430 fs/splice.c:1173
  __do_sys_splice fs/splice.c:1414 [inline]
  __se_sys_splice fs/splice.c:1394 [inline]
  __x64_sys_splice+0x2c1/0x330 fs/splice.c:1394
  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6517086c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457569
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RBP: 000000000072bfa0 R08: 0000000010000200 R09: 0000000000000000
RIP: 0033:0x457569
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f65170876d4
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
R13: 00000000004c5719 R14: 00000000004d8c08 R15: 00000000ffffffff
RSP: 002b:00007fed2599bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457569
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000072bfa0 R08: 0000000010000200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fed2599c6d4
R13: 00000000004c5719 R14: 00000000004d8c08 R15: 00000000ffffffff
irq event stamp: 352
hardirqs last  enabled at (351): [<ffffffff814ad030>]  
__local_bh_enable_ip+0x160/0x260 kernel/softirq.c:194
hardirqs last disabled at (352): [<ffffffff81007ced>]  
trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last  enabled at (350): [<ffffffff86aef3ab>] spin_unlock_bh  
include/linux/spinlock.h:374 [inline]
softirqs last  enabled at (350): [<ffffffff86aef3ab>]  
__skb_recv_udp+0x4ab/0xaf0 net/ipv4/udp.c:1611
softirqs last disabled at (348): [<ffffffff86aef190>] spin_lock_bh  
include/linux/spinlock.h:334 [inline]
softirqs last disabled at (348): [<ffffffff86aef190>]  
__skb_recv_udp+0x290/0xaf0 net/ipv4/udp.c:1583
---[ end trace fcfb475d82d5a575 ]---
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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