syzbot


general protection fault in sctp_backlog_rcv

Status: auto-obsoleted due to no activity on 2023/04/01 07:18
Subsystems: sctp
[Documentation on labels]
Reported-by: syzbot+174db8e2963d950bb50d@syzkaller.appspotmail.com
First crash: 397d, last: 397d

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 5574 Comm: syz-executor.4 Not tainted 6.2.0-rc6-next-20230131-syzkaller-09515-g80bd9028feca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:sctp_backlog_rcv+0xaf/0x5b0 net/sctp/input.c:290
Code: 48 8d 5d 20 0f 85 b1 04 00 00 49 8b 85 e8 00 00 00 48 8d 7d 08 48 89 fa 48 c1 ea 03 48 89 04 24 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 02 84 c0 74 06 0f 8e 0c 03 00 00 44 0f b6 7d 08 31 ff 44
RSP: 0018:ffffc90005b1fc00 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffc900044e5000
RDX: 0000000000000001 RSI: ffffffff89605e0d RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000094001 R12: ffff88814a802d00
R13: ffff8880778f2140 R14: ffff888070bb3c80 R15: 0000000000000000
FS:  00007f0eda6af700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555555c2888 CR3: 0000000029fe1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sk_backlog_rcv include/net/sock.h:1113 [inline]
 __release_sock+0x133/0x3b0 net/core/sock.c:2928
 release_sock+0x58/0x1b0 net/core/sock.c:3487
 sctp_setsockopt+0x64a/0xab90 net/sctp/socket.c:4772
 __sys_setsockopt+0x2c6/0x5b0 net/socket.c:2271
 __do_sys_setsockopt net/socket.c:2282 [inline]
 __se_sys_setsockopt net/socket.c:2279 [inline]
 __x64_sys_setsockopt+0xbe/0x160 net/socket.c:2279
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f0ed988c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0eda6af168 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f0ed99ac050 RCX: 00007f0ed988c0c9
RDX: 0000000000000009 RSI: 0000000000000084 RDI: 0000000000000004
RBP: 00007f0ed98e7ae9 R08: 000000000000009c R09: 0000000000000000
R10: 0000000020000500 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc6d02065f R14: 00007f0eda6af300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sctp_backlog_rcv+0xaf/0x5b0 net/sctp/input.c:290
Code: 48 8d 5d 20 0f 85 b1 04 00 00 49 8b 85 e8 00 00 00 48 8d 7d 08 48 89 fa 48 c1 ea 03 48 89 04 24 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 02 84 c0 74 06 0f 8e 0c 03 00 00 44 0f b6 7d 08 31 ff 44
RSP: 0018:ffffc90005b1fc00 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffc900044e5000
RDX: 0000000000000001 RSI: ffffffff89605e0d RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000094001 R12: ffff88814a802d00
R13: ffff8880778f2140 R14: ffff888070bb3c80 R15: 0000000000000000
FS:  00007f0eda6af700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f53601ad988 CR3: 0000000029fe1000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 8d 5d 20          	lea    0x20(%rbp),%rbx
   4:	0f 85 b1 04 00 00    	jne    0x4bb
   a:	49 8b 85 e8 00 00 00 	mov    0xe8(%r13),%rax
  11:	48 8d 7d 08          	lea    0x8(%rbp),%rdi
  15:	48 89 fa             	mov    %rdi,%rdx
  18:	48 c1 ea 03          	shr    $0x3,%rdx
  1c:	48 89 04 24          	mov    %rax,(%rsp)
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 06                	je     0x38
  32:	0f 8e 0c 03 00 00    	jle    0x344
  38:	44 0f b6 7d 08       	movzbl 0x8(%rbp),%r15d
  3d:	31 ff                	xor    %edi,%edi
  3f:	44                   	rex.R

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/31 07:17 linux-next 80bd9028feca 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in sctp_backlog_rcv
* Struck through repros no longer work on HEAD.