BUG: unable to handle kernel paging request in rtnl_newlink_create

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a5541c0811a0 Merge branch 'for-next/core' into for-kernelci
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=168f4164480000
kernel config: https://syzkaller.appspot.com/x/.config?x=cbd4e584773e9397
dashboard link: https://syzkaller.appspot.com/bug?extid=3992c89826fcf7ea85d3
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
CC: [a...@kernel.org b...@vger.kernel.org dan...@iogearbox.net da...@davemloft.net edum...@google.com ha...@kernel.org ido...@nvidia.com john.fa...@gmail.com ku...@kernel.org linux-...@vger.kernel.org net...@vger.kernel.org pab...@redhat.com pe...@nvidia.com]

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4b7702208fb9/disk-a5541c08.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9ec0153ec051/vmlinux-a5541c08.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6f8725ad290a/Image-a5541c08.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3992c8...@syzkaller.appspotmail.com

Unable to handle kernel paging request at virtual address 000000440032000c
Mem abort info:
ESR = 0x0000000096000005
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x05: level 1 translation fault
Data abort info:
ISV = 0, ISS = 0x00000005
CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000159efe000
[000000440032000c] pgd=080000015e588003, p4d=080000015e588003, pud=0000000000000000
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 19359 Comm: syz-executor.0 Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : nla_get_u32 include/net/netlink.h:1571 [inline]
pc : rtnl_newlink_create+0x4a4/0x6bc net/core/rtnetlink.c:3381
lr : rtnl_newlink_create+0x498/0x6bc net/core/rtnetlink.c:3375
sp : ffff800014ce3530
x29: ffff800014ce3560 x28: ffff800009dea6b8 x27: 0000000000001002
x26: 0000000000000000 x25: 0000000000000000 x24: ffff00013b664800
x23: ffff00011a2b8000 x22: ffff800014ce39d0 x21: ffff80000d6edf70
x20: 0000000000000000 x19: ffff0000c9ddb680 x18: 00000000000000dd
x17: 0000000000000000 x16: ffff80000dbe6158 x15: ffff0001198b4ec0
x14: 0000000000000020 x13: 00000000ffffffff x12: ffff0001198b4ec0
x11: ff8080000b2a0b0c x10: 0000000000000000 x9 : ffff80000b2a0b0c
x8 : 0000004400320008 x7 : ffff80000818c2d8 x6 : 0000000000000000
x5 : ffff800014ce3350 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 0000000000000006 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
rtnl_newlink_create+0x4a4/0x6bc net/core/rtnetlink.c:3380
__rtnl_newlink net/core/rtnetlink.c:3581 [inline]
rtnl_newlink+0x728/0xa04 net/core/rtnetlink.c:3594
rtnetlink_rcv_msg+0x484/0x82c net/core/rtnetlink.c:6091
netlink_rcv_skb+0xe8/0x1d4 net/netlink/af_netlink.c:2540
rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6109
netlink_unicast_kernel+0xfc/0x1dc net/netlink/af_netlink.c:1319
netlink_unicast+0x164/0x248 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x484/0x584 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg net/socket.c:734 [inline]
____sys_sendmsg+0x2f8/0x440 net/socket.c:2482
___sys_sendmsg net/socket.c:2536 [inline]
__sys_sendmsg+0x1ac/0x228 net/socket.c:2565
__do_sys_sendmsg net/socket.c:2574 [inline]
__se_sys_sendmsg net/socket.c:2572 [inline]
__arm64_sys_sendmsg+0x2c/0x3c net/socket.c:2572
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Code: 974017c7 2a1f03f9 f9402b08 b4000208 (b9400518)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 974017c7 bl 0xfffffffffd005f1c
4: 2a1f03f9 mov w25, wzr
8: f9402b08 ldr x8, [x24, #80]
c: b4000208 cbz x8, 0x4c
* 10: b9400518 ldr w24, [x8, #4] <-- trapping instruction


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[syzbot]

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