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general protection fault in rds_tcp_accept_one

Status: upstream: reported C repro on 2026/02/09 15:41
Subsystems: rds
[Documentation on labels]
Reported-by: syzbot+96046021045ffe6d7709@syzkaller.appspotmail.com
Fix commit: 6bf45704a92a net/rds: Fix NULL pointer dereference in rds_tcp_accept_one
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64 ci-upstream-gce-arm64]
First crash: 27d, last: 13d
▶ ▼ Discussions (5)
Title Replies (including bot) Last reply
[PATCH net-next v5 0/2] net/rds: RDS-TCP reconnect and fanout improvements 1 (1) 2026/02/23 22:19
[PATCH net] net/rds: Fix NULL pointer dereference in rds_tcp_accept_one 1 (1) 2026/02/16 22:26
[PATCH net-next v4 0/4] net/rds: RDS-TCP reconnect and fanout improvements 2 (2) 2026/02/12 05:32
[PATCH net-next v3 0/4] net/rds: RDS-TCP reconnect and fanout improvements 3 (3) 2026/02/10 09:12
[syzbot] [rds?] general protection fault in rds_tcp_accept_one 0 (4) 2026/02/10 07:31
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2026/02/10 07:31 37m allison.henderson@oracle.com https://github.com/allisonhenderson/rds_work.git rds_tcp_bug_fixes_v15 OK log
2026/02/10 07:05 0m allison.henderson@oracle.com patch git@github.com:allisonhenderson/rds_work.git rds_tcp_bug_fixes_v14 error
2026/02/10 02:15 1h49m allison.henderson@oracle.com patch git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main report log

Sample crash report:
netdevsim netdevsim1 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 UID: 0 PID: 3485 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: krdsd rds_tcp_accept_worker
RIP: 0010:rds_tcp_accept_one+0xa5b/0xd70 net/rds/tcp_listen.c:319
Code: 00 00 48 83 c3 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 63 a9 2f f7 48 8b 1b 48 83 c3 12 49 89 de 49 c1 ee 03 <43> 0f b6 04 2e 84 c0 0f 85 53 02 00 00 44 0f b6 2b bf 08 00 00 00
RSP: 0018:ffffc9000b64f9a0 EFLAGS: 00010202
RAX: 1ffff1100dacb173 RBX: 0000000000000012 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8e006fa9 RDI: 00000000ffffffff
RBP: ffffc9000b64fb18 R08: ffffffff903342b7 R09: 1ffffffff2066856
R10: dffffc0000000000 R11: fffffbfff2066857 R12: ffff88803286c000
R13: dffffc0000000000 R14: 0000000000000002 R15: 1ffff920016c9f3c
FS:  0000000000000000(0000) GS:ffff888125115000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f30359456b8 CR3: 00000000320ee000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rds_tcp_accept_worker+0x1d/0x70 net/rds/tcp.c:524
 process_one_work+0x949/0x1650 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rds_tcp_accept_one+0xa5b/0xd70 net/rds/tcp_listen.c:319
Code: 00 00 48 83 c3 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 63 a9 2f f7 48 8b 1b 48 83 c3 12 49 89 de 49 c1 ee 03 <43> 0f b6 04 2e 84 c0 0f 85 53 02 00 00 44 0f b6 2b bf 08 00 00 00
RSP: 0018:ffffc9000b64f9a0 EFLAGS: 00010202
RAX: 1ffff1100dacb173 RBX: 0000000000000012 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8e006fa9 RDI: 00000000ffffffff
RBP: ffffc9000b64fb18 R08: ffffffff903342b7 R09: 1ffffffff2066856
R10: dffffc0000000000 R11: fffffbfff2066857 R12: ffff88803286c000
R13: dffffc0000000000 R14: 0000000000000002 R15: 1ffff920016c9f3c
FS:  0000000000000000(0000) GS:ffff888125115000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f303594da08 CR3: 000000000e74c000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	48 83 c3 18          	add    $0x18,%rbx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 63 a9 2f f7       	call   0xf72fa97f
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 12          	add    $0x12,%rbx
  23:	49 89 de             	mov    %rbx,%r14
  26:	49 c1 ee 03          	shr    $0x3,%r14
* 2a:	43 0f b6 04 2e       	movzbl (%r14,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 53 02 00 00    	jne    0x28a
  37:	44 0f b6 2b          	movzbl (%rbx),%r13d
  3b:	bf 08 00 00 00       	mov    $0x8,%edi

Crashes (1334):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/06 01:28 linux-next 9845cf73f7db f03c4191 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/06 00:12 linux-next 9845cf73f7db f03c4191 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 23:37 upstream 2b7a25df823d 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/19 20:20 upstream 2b7a25df823d 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in rds_tcp_accept_one
2026/02/19 19:04 upstream 2b7a25df823d 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/19 06:44 upstream 956b9cbd7f15 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in rds_tcp_accept_one
2026/02/19 05:04 upstream 956b9cbd7f15 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 11:35 upstream 2961f841b025 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/18 10:28 upstream 2961f841b025 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/18 05:37 upstream d295082ea672 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/18 03:02 upstream d295082ea672 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/17 21:17 upstream d295082ea672 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/17 19:12 upstream 970296997869 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in rds_tcp_accept_one
2026/02/17 18:11 upstream 970296997869 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/20 00:07 upstream 2b7a25df823d 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in rds_tcp_accept_one
2026/02/20 01:41 upstream 2b7a25df823d 73a252ac .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/19 21:20 upstream 2b7a25df823d 73a252ac .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/19 03:39 upstream 23b0f90ba871 746545b8 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/18 23:38 upstream 23b0f90ba871 77d4d919 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/18 22:34 upstream 23b0f90ba871 77d4d919 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/18 21:19 upstream 23b0f90ba871 77d4d919 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/18 17:55 upstream 2961f841b025 77d4d919 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/18 00:58 upstream d295082ea672 4db8fa92 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/17 23:50 upstream d295082ea672 f4288eed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in rds_tcp_accept_one
2026/02/17 22:42 upstream d295082ea672 f4288eed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in rds_tcp_accept_one
2026/02/17 19:40 upstream d295082ea672 4db8fa92 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/17 17:01 upstream 970296997869 4db8fa92 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/17 15:44 upstream 970296997869 4db8fa92 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in rds_tcp_accept_one
2026/02/18 16:53 upstream 2961f841b025 77d4d919 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in rds_tcp_accept_one
2026/02/19 16:38 net 45be47bf5d7d 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 15:18 net 45be47bf5d7d 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 14:11 net 45be47bf5d7d 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 12:46 net 45be47bf5d7d 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 11:44 net 45be47bf5d7d 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 10:26 net 45be47bf5d7d 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 07:52 net 45be47bf5d7d 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 06:24 net 45be47bf5d7d 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 01:45 net ccd8e87748ad 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 19:21 net ccd8e87748ad 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 16:14 net ccd8e87748ad 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 15:05 net ccd8e87748ad 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 14:22 net ccd8e87748ad 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 13:18 net ccd8e87748ad 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 07:28 net 77c5e3fdd279 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 06:57 net 77c5e3fdd279 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/17 20:48 net 77c5e3fdd279 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/17 16:57 net 22069735ff6d e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 09:04 net-next 37a93dd5c49b 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 00:45 net-next 37a93dd5c49b 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 01:50 net-next 37a93dd5c49b 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/20 08:29 linux-next 44982d352c33 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/20 05:32 linux-next 44982d352c33 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/20 04:08 linux-next 44982d352c33 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/19 17:24 linux-next 44982d352c33 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/19 15:25 linux-next 44982d352c33 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/18 12:17 linux-next fe9e3edb6a21 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in rds_tcp_accept_one
2026/02/18 08:30 linux-next fe9e3edb6a21 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/18 04:09 linux-next fe9e3edb6a21 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in rds_tcp_accept_one
2026/02/19 22:31 upstream 2b7a25df823d 73a252ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-use-after-free Read in rds_tcp_accept_one
2026/02/18 20:28 net ccd8e87748ad 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce KASAN: slab-use-after-free Read in rds_tcp_accept_one
* Struck through repros no longer work on HEAD.