syzbot


kernel BUG in socket

Status: fixed on 2026/01/25 17:01
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+e956b5830b1895c9cb7b@syzkaller.appspotmail.com
Fix commit: afb9917d9b37 Revert "net/socket: convert sock_map_fd() to FD_ADD()"
First crash: 65d, last: 41d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [fs?] kernel BUG in socket 1 (2) 2025/12/25 10:51

Sample crash report:
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fa38bbe5fa0 R14: 00007fa38bbe5fa0 R15: 0000000000000000
 </TASK>
VFS_BUG_ON_INODE(inode_state_read_once(inode) & I_CLEAR) encountered for inode ffff88805b5d5140
fs sockfs mode 140777 opflags 0x8 flags 0x0 state 0x300 count 0
------------[ cut here ]------------
kernel BUG at fs/inode.c:1978!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 6012 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:iput+0xfc9/0x1030 fs/inode.c:1978
Code: 8b 7c 24 18 48 c7 c6 80 c0 99 8b e8 61 c1 e6 fe 90 0f 0b e8 19 7b 80 ff 48 8b 7c 24 18 48 c7 c6 20 c0 99 8b e8 48 c1 e6 fe 90 <0f> 0b 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c cd fb ff ff 4c 89 ef
RSP: 0018:ffffc90002ff7de0 EFLAGS: 00010282
RAX: 000000000000009f RBX: dffffc0000000000 RCX: 9e18d727a1916b00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffffffff1f54606 R08: ffffc90002ff7aa7 R09: 1ffff920005fef54
R10: dffffc0000000000 R11: fffff520005fef55 R12: 1ffff1100b6baa68
R13: ffff88805b5d5340 R14: 0000000000000200 R15: 1ffffffff1f7f5d4
FS:  000055556e081500(0000) GS:ffff888125b41000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ec8d3e1138 CR3: 0000000076182000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 sock_release net/socket.c:685 [inline]
 sock_map_fd net/socket.c:510 [inline]
 __sys_socket+0x2f0/0x370 net/socket.c:1762
 __do_sys_socket net/socket.c:1767 [inline]
 __se_sys_socket net/socket.c:1765 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1765
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa38b98f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe62833658 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fa38bbe5fa0 RCX: 00007fa38b98f749
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000004 R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fa38bbe5fa0 R14: 00007fa38bbe5fa0 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:iput+0xfc9/0x1030 fs/inode.c:1978
Code: 8b 7c 24 18 48 c7 c6 80 c0 99 8b e8 61 c1 e6 fe 90 0f 0b e8 19 7b 80 ff 48 8b 7c 24 18 48 c7 c6 20 c0 99 8b e8 48 c1 e6 fe 90 <0f> 0b 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c cd fb ff ff 4c 89 ef
RSP: 0018:ffffc90002ff7de0 EFLAGS: 00010282
RAX: 000000000000009f RBX: dffffc0000000000 RCX: 9e18d727a1916b00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffffffff1f54606 R08: ffffc90002ff7aa7 R09: 1ffff920005fef54
R10: dffffc0000000000 R11: fffff520005fef55 R12: 1ffff1100b6baa68
R13: ffff88805b5d5340 R14: 0000000000000200 R15: 1ffffffff1f7f5d4
FS:  000055556e081500(0000) GS:ffff888125b41000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ec8d3e1138 CR3: 0000000076182000 CR4: 00000000003526f0

Crashes (145):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/25 16:54 linux-next 92fd6e84175b 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce kernel BUG in socket
2025/11/25 16:09 linux-next 92fd6e84175b 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce kernel BUG in socket
2025/11/25 15:31 linux-next 92fd6e84175b 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce kernel BUG in socket
2025/11/25 14:44 linux-next 92fd6e84175b 64219f15 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce kernel BUG in socket
2025/12/06 11:29 upstream 7203ca412fc8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root kernel BUG in socket
2025/12/06 07:39 upstream 7203ca412fc8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root kernel BUG in socket
2025/12/05 16:20 upstream 2061f18ad76e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in socket
2025/12/05 08:35 upstream 2aa680df6806 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root kernel BUG in socket
2025/12/05 01:14 upstream aa833fc394ba d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in socket
2025/12/04 13:18 upstream 559e608c4655 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in socket
2025/12/04 13:17 upstream 559e608c4655 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in socket
2025/12/04 12:13 upstream 559e608c4655 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce kernel BUG in socket
2025/12/06 12:41 upstream 7203ca412fc8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 kernel BUG in socket
2025/12/06 09:49 upstream 7203ca412fc8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 kernel BUG in socket
2025/12/06 07:48 upstream 7203ca412fc8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 kernel BUG in socket
2025/12/05 22:38 upstream 2061f18ad76e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 kernel BUG in socket
2025/12/05 03:21 upstream fa5ef105618a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 kernel BUG in socket
2025/12/04 17:45 upstream 559e608c4655 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 kernel BUG in socket
2025/12/04 10:44 upstream 559e608c4655 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 kernel BUG in socket
2025/12/05 10:02 upstream 2061f18ad76e d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in socket
2025/12/04 15:00 upstream cc25df3e2e22 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in socket
2025/12/19 06:31 net 21a88f5d9ce0 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce kernel BUG in socket
2025/12/19 02:24 net 21a88f5d9ce0 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce kernel BUG in socket
2025/12/15 07:08 bpf 1d528e794f3d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce kernel BUG in socket
2025/12/13 06:38 net 885bebac9909 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce kernel BUG in socket
2025/12/12 07:45 bpf 1d528e794f3d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce kernel BUG in socket
2025/12/12 05:49 bpf 1d528e794f3d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce kernel BUG in socket
2025/12/11 03:30 bpf 1d528e794f3d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce kernel BUG in socket
2025/12/10 23:25 net 6bcb7727d9e6 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce kernel BUG in socket
2025/12/10 13:36 bpf 297c3fba9d76 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce kernel BUG in socket
2025/12/10 12:23 bpf 297c3fba9d76 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce kernel BUG in socket
2025/12/09 13:24 net 186468c67fc6 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce kernel BUG in socket
2025/12/08 21:07 bpf 861111b69896 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce kernel BUG in socket
2025/12/05 20:02 bpf 861111b69896 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce kernel BUG in socket
2025/12/16 19:57 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in socket
2025/12/14 12:28 bpf-next 6f0b824a61f2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/14 07:09 bpf-next 6f0b824a61f2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/14 04:41 bpf-next 6f0b824a61f2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/14 02:34 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in socket
2025/12/13 11:30 bpf-next 759377dab35e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/12 14:08 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in socket
2025/12/11 08:47 bpf-next 759377dab35e d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/10 16:58 bpf-next c93c1246003d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/10 09:28 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in socket
2025/12/08 07:01 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in socket
2025/12/07 23:47 bpf-next 5d9fb42f05e5 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/07 06:24 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in socket
2025/12/07 02:46 bpf-next 5d9fb42f05e5 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/06 16:31 bpf-next 5d9fb42f05e5 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/06 04:25 bpf-next 81f88f6ab674 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/06 00:06 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in socket
2025/12/05 08:25 bpf-next 835a50753579 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce kernel BUG in socket
2025/12/04 18:48 net-next 8f7aa3d3c732 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce kernel BUG in socket
2025/12/07 07:57 linux-next 6987d58a9cbc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in socket
2025/12/06 02:16 linux-next 6987d58a9cbc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce kernel BUG in socket
2025/12/05 21:16 linux-next 6987d58a9cbc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in socket
2025/12/05 14:29 linux-next 6987d58a9cbc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in socket
2025/12/04 23:07 linux-next bc04acf4aeca d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in socket
2025/12/04 20:33 linux-next bc04acf4aeca d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in socket
* Struck through repros no longer work on HEAD.