general protection fault in inet_gifconf

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c14d30dc Linux 4.19.139
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1523257a900000
kernel config: https://syzkaller.appspot.com/x/.config?x=93b261233af4719e
dashboard link: https://syzkaller.appspot.com/bug?extid=9a6303ad66ae03997001
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9a6303...@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
overlayfs: upperdir is in-use as upperdir/workdir of another mount, mount with '-o index=off' to override exclusive upperdir protection.
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 16243 Comm: syz-executor.4 Not tainted 4.19.139-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__in_dev_get_rtnl include/linux/inetdevice.h:237 [inline]
RIP: 0010:inet_gifconf+0xdd/0x380 net/ipv4/devinet.c:1212
Code: 29 a5 42 fb 45 84 e4 0f 84 42 02 00 00 e8 eb a3 42 fb 48 8d bb 28 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7f 02 00 00 89 ee bf 28 00 00 00 48 8b 9b 28 03
RSP: 0018:ffff888206eb7a30 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 00076fffffffffb0 RCX: ffffc9000e513000
RDX: 0000ee000000005b RSI: ffffffff86270bd5 RDI: 00077000000002d8
RBP: 0000000000000028 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000848 R14: 00000000004b1988 R15: 00076fffffffffb0
FS: 00007fd7fccf9700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016a8660 CR3: 0000000052ffe000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
dev_ifconf+0xdb/0x230 net/core/dev_ioctl.c:80
sock_do_ioctl+0x202/0x2d0 net/socket.c:964
sock_ioctl+0x2ef/0x5d0 net/socket.c:1074
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d239
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd7fccf8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000011f00 RCX: 000000000045d239
RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000009
RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007ffd580b9bdf R14: 00007fd7fccf99c0 R15: 000000000118cfec
Modules linked in:
---[ end trace 9af1680aa0d4aca1 ]---
RIP: 0010:__in_dev_get_rtnl include/linux/inetdevice.h:237 [inline]
RIP: 0010:inet_gifconf+0xdd/0x380 net/ipv4/devinet.c:1212
Code: 29 a5 42 fb 45 84 e4 0f 84 42 02 00 00 e8 eb a3 42 fb 48 8d bb 28 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7f 02 00 00 89 ee bf 28 00 00 00 48 8b 9b 28 03
RSP: 0018:ffff888206eb7a30 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 00076fffffffffb0 RCX: ffffc9000e513000
RDX: 0000ee000000005b RSI: ffffffff86270bd5 RDI: 00077000000002d8
RBP: 0000000000000028 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000848 R14: 00000000004b1988 R15: 00076fffffffffb0
FS: 00007fd7fccf9700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b19f6c04a8 CR3: 0000000052ffe000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.