syzbot


Internal error in __receive_fd

Status: upstream: reported C repro on 2025/08/09 00:05
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+b2d75bbb97809f3a6857@syzkaller.appspotmail.com
First crash: 6d12h, last: 1d02h
Bug presence (2)
Date Name Commit Repro Result
2025/08/13 linux-5.15.y (ToT) c79648372d02 C [report] Internal error in __receive_fd
2025/08/13 upstream (ToT) 8742b2d8935f C Didn't crash

Sample crash report:
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4182 Comm: syz.0.17 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : __receive_fd+0x18c/0x28c fs/file.c:1196
lr : __receive_fd+0x168/0x28c fs/file.c:1195
sp : ffff80001fd57500
x29: ffff80001fd57500 x28: dfff800000000000 x27: 0000000000000000
x26: 0000000000000000 x25: 00000020002f9000 x24: dfff800000000000
x23: 00000000fffffff2 x22: 0000000020002f90 x21: ffff0000d69bb680
x20: 0000000000000005 x19: ffff0000ceaec000 x18: 0000000000000000
x17: ffff800016d04000 x16: ffff800008952294 x15: ffff8000167e4500
x14: ffff0000d69bc080 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000020002f90 x9 : 0000ffffffffffff
x8 : 0000000020002f90 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 __receive_fd+0x18c/0x28c fs/file.c:1195
 receive_fd_user include/linux/file.h:105 [inline]
 scm_detach_fds+0x188/0x7f8 net/core/scm.c:324
 scm_recv+0x348/0x460 include/net/scm.h:151
 __unix_dgram_recvmsg+0x7d8/0xb28 net/unix/af_unix.c:2392
 unix_dgram_recvmsg+0xd4/0xec net/unix/af_unix.c:2413
 ____sys_recvmsg+0x254/0x794 net/socket.c:-1
 ___sys_recvmsg+0x1ac/0x220 net/socket.c:2697
 __sys_recvmsg net/socket.c:2727 [inline]
 __do_sys_recvmsg net/socket.c:2737 [inline]
 __se_sys_recvmsg net/socket.c:2734 [inline]
 __arm64_sys_recvmsg+0x1a4/0x250 net/socket.c:2734
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03f7 2a1f03e0 b8000954 (2a1703e1) 
---[ end trace f34a1244306b5af9 ]---
----------------
Code disassembly (best guess):
   0:	d503229f 	csdb
   4:	2a1f03f7 	mov	w23, wzr
   8:	2a1f03e0 	mov	w0, wzr
   c:	b8000954 	sttr	w20, [x10]
* 10:	2a1703e1 	mov	w1, w23 <-- trapping instruction

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/10 16:04 linux-5.15.y c79648372d02 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/14 05:49 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/14 05:47 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/14 03:33 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/14 03:33 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/13 04:13 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/13 04:13 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/13 03:10 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/13 03:09 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/13 02:29 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/13 02:27 linux-5.15.y c79648372d02 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/09 12:23 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/09 07:05 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/08 20:02 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
2025/08/08 20:02 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in __receive_fd
* Struck through repros no longer work on HEAD.