syzbot


BUG: unable to handle kernel paging request in rtnl_newlink_create

Status: auto-obsoleted due to no activity on 2023/03/25 11:37
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+3992c89826fcf7ea85d3@syzkaller.appspotmail.com
First crash: 521d, last: 521d

Sample crash report:
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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/25 11:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a5541c0811a0 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in rtnl_newlink_create
* Struck through repros no longer work on HEAD.