syzbot


BUG: unable to handle kernel paging request in ip6_output

Status: upstream: reported on 2024/05/23 17:34
Reported-by: syzbot+55c7d55dbeb18611866e@syzkaller.appspotmail.com
First crash: 58d, last: 8d23h
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in ip6_output net 4 78d 97d 26/27 fixed on 2024/06/05 19:57

Sample crash report:
Unable to handle kernel paging request at virtual address dfff8000000000cd
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff8000000000cd] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 8098 Comm: syz-executor.3 Not tainted 5.15.159-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : ip6_output+0x1d4/0x594 net/ipv6/ip6_output.c:224
lr : skb_dst include/linux/skbuff.h:1020 [inline]
lr : ip6_output+0x11c/0x594 net/ipv6/ip6_output.c:219
sp : ffff80001d476e30
x29: ffff80001d476e40 x28: 1fffe00019187fc3 x27: dfff800000000000
x26: 0000000000000000 x25: ffff0000c8c3fdd0 x24: 0000000000000668
x23: 0000000000000000 x22: ffff0000cf6a0000 x21: ffff0000d2e44140
x20: 1fffe00019187fba x19: ffff0000c8c3fdc0 x18: 0000000000000401
x17: 0000000000000002 x16: ffff8000084c430c x15: 0000000000000003
x14: ffff0000d2ee0000 x13: 0000000000ff0100 x12: 0000000000040000
x11: 000000000000a570 x10: ffff80001e5eb000 x9 : 000000000000a571
x8 : 00000000000000cd x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff80000804685c
x2 : ffff0000c8c3fdc0 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 ip6_output+0x1d4/0x594 net/ipv6/ip6_output.c:224
 dst_output include/net/dst.h:443 [inline]
 ip6_local_out+0x120/0x160 net/ipv6/output_core.c:161
 ip6_send_skb+0x118/0x428 net/ipv6/ip6_output.c:1943
 ip6_push_pending_frames+0xd0/0x118 net/ipv6/ip6_output.c:1963
 icmpv6_push_pending_frames+0x244/0x398 net/ipv6/icmp.c:311
 icmp6_send+0x11a4/0x1b18 net/ipv6/icmp.c:630
 __icmpv6_send include/linux/icmpv6.h:28 [inline]
 icmpv6_send include/linux/icmpv6.h:49 [inline]
 ip6_link_failure+0x44/0x4a8 net/ipv6/route.c:2790
 dst_link_failure include/net/dst.h:422 [inline]
 xfrmi_xmit2 net/xfrm/xfrm_interface_core.c:383 [inline]
 xfrmi_xmit+0x850/0x143c net/xfrm/xfrm_interface_core.c:436
 __netdev_start_xmit include/linux/netdevice.h:5019 [inline]
 netdev_start_xmit include/linux/netdevice.h:5033 [inline]
 xmit_one net/core/dev.c:3617 [inline]
 dev_hard_start_xmit+0x2bc/0x92c net/core/dev.c:3633
 __dev_queue_xmit+0x13a8/0x2a6c net/core/dev.c:4248
 dev_queue_xmit+0x24/0x34 net/core/dev.c:4281
 packet_snd net/packet/af_packet.c:3039 [inline]
 packet_sendmsg+0x3654/0x4c68 net/packet/af_packet.c:3070
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2058
 __do_sys_sendto net/socket.c:2070 [inline]
 __se_sys_sendto net/socket.c:2066 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2066
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 9600b877 9119a358 f9000336 d343ff08 (38fb6908) 
---[ end trace 8ff622da53742d67 ]---
----------------
Code disassembly (best guess):
   0:	9600b877 	bl	0xfffffffff802e1dc
   4:	9119a358 	add	x24, x26, #0x668
   8:	f9000336 	str	x22, [x25]
   c:	d343ff08 	lsr	x8, x24, #3
* 10:	38fb6908 	ldrsb	w8, [x8, x27] <-- trapping instruction

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/23 17:33 linux-5.15.y 83655231580b 4c2072ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 BUG: unable to handle kernel paging request in ip6_output
2024/07/11 19:04 linux-5.15.y f45bea23c39c eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan general protection fault in ip6_output
* Struck through repros no longer work on HEAD.