syzbot


general protection fault in dccp_write_xmit (2)

Status: fixed on 2024/01/20 21:18
Subsystems: dccp
[Documentation on labels]
Reported-by: syzbot+c71bc336c5061153b502@syzkaller.appspotmail.com
Fix commit: cac23b7d7627 net: Return error from sk_stream_wait_connect() if sk_wait_event() fails
First crash: 212d, last: 152d
Cause bisection: introduced by (bisect log) :
commit 419ce133ab928ab5efd7b50b2ef36ddfd4eadbd2
Author: Paolo Abeni <pabeni@redhat.com>
Date: Wed Oct 11 07:20:55 2023 +0000

  tcp: allow again tcp_disconnect() when threads are waiting

Crash: BUG: unable to handle kernel NULL pointer dereference in dccp_write_xmit (log)
Repro: C syz .config
  
Discussions (6)
Title Replies (including bot) Last reply
Re: [PATCH net] net: Return error from sk_stream_wait_connect() if sk_wait_event() fails 4 (4) 2023/12/14 13:58
[syzbot] [dccp?] general protection fault in dccp_write_xmit (2) 0 (4) 2023/12/14 12:43
Re: [syzbot] [dccp?] general protection fault in dccp_write_xmit (2) 1 (1) 2023/12/11 12:08
[syzbot] Monthly dccp report (Dec 2023) 0 (1) 2023/12/08 13:16
[PATCH net] dccp: check for ccid in ccid_hc_tx_send_packet 5 (5) 2023/11/02 11:14
Re: [PATCH net] dccp: check for ccid in ccid_hc_tx_send_packet 1 (1) 2023/10/30 16:24
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in dccp_write_xmit dccp C 5 2266d 2303d 4/26 fixed on 2018/03/23 18:14
linux-6.1 general protection fault in dccp_write_xmit origin:lts-only C inconclusive 4 142d 159d 0/3 upstream: reported C repro on 2023/12/12 16:47
Last patch testing requests (1)
Created Duration User Patch Repo Result
2023/12/14 12:43 23m syoshida@redhat.com patch upstream OK log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5117 Comm: syz-executor225 Not tainted 6.6.0-syzkaller-15859-g89cdf9d55601 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:ccid_hc_tx_send_packet net/dccp/ccid.h:166 [inline]
RIP: 0010:dccp_write_xmit+0x66/0x1d0 net/dccp/output.c:356
Code: 00 48 85 c0 49 89 c4 0f 84 03 01 00 00 e8 d2 6d cb f7 41 80 3e 00 0f 85 45 01 00 00 48 8b 9d f0 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 1f 01 00 00 48 8b 1b 48 8d bb b0 00 00 00 48
RSP: 0018:ffffc90003b4f870 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801cf29dc0 RSI: ffffffff89bd32be RDI: ffff88801c5c1480
RBP: ffff88801c5c1480 R08: 0000000000000001 R09: fffffbfff23e3fe7
R10: ffffffff91f1ff3f R11: ffffffff915e93a0 R12: ffff888079792b40
R13: dffffc0000000000 R14: ffffed10038b83ae R15: ffff88801c5c1d70
FS:  00007fde807836c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff061d99c0 CR3: 0000000073c3c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dccp_sendmsg+0x968/0xcc0 net/dccp/proto.c:801
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:847
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 ____sys_sendmsg+0x2ac/0x940 net/socket.c:2584
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638
 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2724
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2750
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fde807e74d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 1a 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fde80783218 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fde80871438 RCX: 00007fde807e74d9
RDX: 0400000000000239 RSI: 0000000020002980 RDI: 0000000000000006
RBP: 00007fde80871430 R08: 00007fff06172b27 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fde8087143c
R13: 00007fde8083e504 R14: 0400000000000239 R15: 00007fff06172b28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ccid_hc_tx_send_packet net/dccp/ccid.h:166 [inline]
RIP: 0010:dccp_write_xmit+0x66/0x1d0 net/dccp/output.c:356
Code: 00 48 85 c0 49 89 c4 0f 84 03 01 00 00 e8 d2 6d cb f7 41 80 3e 00 0f 85 45 01 00 00 48 8b 9d f0 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 1f 01 00 00 48 8b 1b 48 8d bb b0 00 00 00 48
RSP: 0018:ffffc90003b4f870 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801cf29dc0 RSI: ffffffff89bd32be RDI: ffff88801c5c1480
RBP: ffff88801c5c1480 R08: 0000000000000001 R09: fffffbfff23e3fe7
R10: ffffffff91f1ff3f R11: ffffffff915e93a0 R12: ffff888079792b40
R13: dffffc0000000000 R14: ffffed10038b83ae R15: ffff88801c5c1d70
FS:  00007fde807836c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde8083d188 CR3: 0000000073c3c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 48 85             	add    %cl,-0x7b(%rax)
   3:	c0 49 89 c4          	rorb   $0xc4,-0x77(%rcx)
   7:	0f 84 03 01 00 00    	je     0x110
   d:	e8 d2 6d cb f7       	call   0xf7cb6de4
  12:	41 80 3e 00          	cmpb   $0x0,(%r14)
  16:	0f 85 45 01 00 00    	jne    0x161
  1c:	48 8b 9d f0 08 00 00 	mov    0x8f0(%rbp),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	0f 85 1f 01 00 00    	jne    0x154
  35:	48 8b 1b             	mov    (%rbx),%rbx
  38:	48 8d bb b0 00 00 00 	lea    0xb0(%rbx),%rdi
  3f:	48                   	rex.W

Crashes (32):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/10 19:37 upstream 89cdf9d55601 45e9b83e .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in dccp_write_xmit
2023/11/06 22:52 upstream d2f51b3516da 78fae24e .config console log report syz C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in dccp_write_xmit
2023/11/07 00:47 net 40cb2fdfed34 78fae24e .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in dccp_write_xmit
2023/11/07 00:03 net-next ff269e2cd5ad 78fae24e .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/11/25 08:14 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8de1e7afcc1c 5b429f39 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in dccp_write_xmit
2023/12/18 01:28 upstream 0e389834672c 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in dccp_write_xmit
2023/12/17 09:10 upstream 3b8a9b2e6809 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in dccp_write_xmit
2023/12/16 06:24 upstream 3bd7d7488169 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in dccp_write_xmit
2023/11/26 01:00 upstream b46ae77f6787 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in dccp_write_xmit
2023/11/09 09:24 upstream 6bc986ab839c 4862372a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in dccp_write_xmit
2023/10/23 18:02 upstream 05d3ef8bba77 989a3687 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in dccp_write_xmit
2023/11/21 10:49 upstream 98b1cc82c4af cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in dccp_write_xmit
2023/11/06 14:04 upstream d2f51b3516da 78fae24e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in dccp_write_xmit
2023/12/15 09:25 net 7bb26ea74aa8 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in dccp_write_xmit
2023/12/11 01:27 net 28a7cb045ab7 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in dccp_write_xmit
2023/12/06 23:37 net 3142dbf084cb e3299f55 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in dccp_write_xmit
2023/12/01 13:58 net 6172a5180fcc f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in dccp_write_xmit
2023/11/25 22:11 net e2b706c69190 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in dccp_write_xmit
2023/11/21 18:13 net c0e2926266af cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in dccp_write_xmit
2023/11/06 01:33 net 016b9332a334 500bfdc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in dccp_write_xmit
2023/12/19 22:05 net-next f7dd48ea76be 3ad490ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/12/16 19:05 net-next 358105ab92fc 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/12/15 03:04 net-next 1b666016d0ad 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/12/07 00:59 net-next 074ac38d5b95 e3299f55 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/11/07 01:48 net-next ff269e2cd5ad 78fae24e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/10/25 18:47 net-next f3bbfe4dbfd4 72e794c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/10/23 17:14 net-next 92fc97ae9cfd 989a3687 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/10/22 18:20 net-next 5e3704030b24 361b23dc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/10/20 22:13 net-next 7ce6936045ba a42250d2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in dccp_write_xmit
2023/12/02 22:30 linux-next 5eda217cee88 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in dccp_write_xmit
2023/12/15 19:49 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d5b235ec8eab 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in dccp_write_xmit
2023/11/09 09:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8de1e7afcc1c 4862372a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in dccp_write_xmit
* Struck through repros no longer work on HEAD.