syzbot


general protection fault in arp_create

Status: moderation: reported on 2024/04/22 16:07
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+e853a4ab28f206e63cad@syzkaller.appspotmail.com
First crash: 35d, last: 35d

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000016: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000b0-0x00000000000000b7]
CPU: 0 PID: 50 Comm: kworker/u8:3 Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: bat_events batadv_bla_periodic_work
RIP: 0010:arp_create+0x46/0x920 net/ipv4/arp.c:553
Code: 49 89 ce 89 54 24 3c 89 74 24 30 89 fb 49 bd 00 00 00 00 00 fc ff df e8 a8 5e ab f7 49 8d be b4 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 ef 05 00 00 45 0f b7 a6 b4 00 00 00 49
RSP: 0018:ffffc90000ba7910 EFLAGS: 00010203
RAX: 0000000000000016 RBX: 0000000000000002 RCX: ffff888017eada00
RDX: 0000000000000000 RSI: 0000000000000806 RDI: 00000000000000b4
RBP: ffffc90000ba7a90 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000174f44 R12: ffff88802f92c018
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f03f3081440 CR3: 000000001ed00000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 batadv_bla_send_claim+0x16f/0xe80 net/batman-adv/bridge_loop_avoidance.c:361
 batadv_bla_send_announce net/batman-adv/bridge_loop_avoidance.c:675 [inline]
 batadv_bla_periodic_work+0x5dc/0xaf0 net/batman-adv/bridge_loop_avoidance.c:1481
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:arp_create+0x46/0x920 net/ipv4/arp.c:553
Code: 49 89 ce 89 54 24 3c 89 74 24 30 89 fb 49 bd 00 00 00 00 00 fc ff df e8 a8 5e ab f7 49 8d be b4 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 ef 05 00 00 45 0f b7 a6 b4 00 00 00 49
RSP: 0018:ffffc90000ba7910 EFLAGS: 00010203
RAX: 0000000000000016 RBX: 0000000000000002 RCX: ffff888017eada00
RDX: 0000000000000000 RSI: 0000000000000806 RDI: 00000000000000b4
RBP: ffffc90000ba7a90 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000174f44 R12: ffff88802f92c018
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f03f3081440 CR3: 000000001ed00000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	49 89 ce             	mov    %rcx,%r14
   3:	89 54 24 3c          	mov    %edx,0x3c(%rsp)
   7:	89 74 24 30          	mov    %esi,0x30(%rsp)
   b:	89 fb                	mov    %edi,%ebx
   d:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  14:	fc ff df
  17:	e8 a8 5e ab f7       	call   0xf7ab5ec4
  1c:	49 8d be b4 00 00 00 	lea    0xb4(%r14),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 ef 05 00 00    	jne    0x626
  37:	45 0f b7 a6 b4 00 00 	movzwl 0xb4(%r14),%r12d
  3e:	00
  3f:	49                   	rex.WB

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/20 00:32 upstream 3cdb45594619 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in arp_create
* Struck through repros no longer work on HEAD.