[Pkg-rust-maintainers] Bug#1144050: Acknowledgement (virtiofsd crashes with SIGSYS (seccomp) on ther first request after a client connects)

Mon Aug 10 10:54:55 BST 2026

Hi again,

Just in case it is useful, this is strace on the virtiofsd process:

sudo strace -f -p 124977

strace: Process 124977 attached with 2 threads
[pid 124978] epoll_wait(6 <unfinished ...>
[pid 124977] accept4(4, {sa_family=AF_UNIX}, [110 => 2], SOCK_CLOEXEC) = 11
[pid 124977] fcntl(11, F_DUPFD_CLOEXEC, 3) = 12
[pid 124977] mmap(NULL, 2101248, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f5564baa000
[pid 124977] madvise(0x7f5564baa000, 4096, MADV_GUARD_INSTALL) = 0
[pid 124977] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
[pid 124977]
clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID,
child_tid=0x7f5564daa990, parent_tid=0x7f5564daa990, exit_signal=0,
stack=0x7f5564baa000, stack_size=0x1ffe00, tls=0x7f5564daa6c0} =>
{parent_tid=[3]}, 88) = 3
strace: Process 125168 attached
[pid 124977] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 125168] rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED,
rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0,
granted=0, __reserved=0}, __reserved=0}, 33, 0, 0x53053053 <unfinished ...>
[pid 124977] write(2, "[2026-08-10T09:52:18Z INFO  virt"..., 76 <unfinished
...>
[pid 125168] <... rseq resumed>)        = 0
[pid 124977] <... write resumed>)       = 76
[pid 125168] set_robust_list(0x7f5564daa9a0, 24 <unfinished ...>
[pid 124977] futex(0x7f5564daa990, FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME,
3, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
[pid 125168] <... set_robust_list resumed>) = 0
[pid 125168] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 125168] prctl(PR_SET_NAME, "virtiofsd-backe"...) = 0
[pid 125168] mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x7f5558000000
[pid 125168] munmap(0x7f555c000000, 67108864) = 0
[pid 125168] mprotect(0x7f5558000000, 135168, PROT_READ|PROT_WRITE) = 0
[pid 125168] sched_getaffinity(3, 32, [0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
15]) = 8
[pid 125168] gettid()                   = 3
[pid 125168] sigaltstack(NULL, {ss_sp=NULL, ss_flags=SS_DISABLE,
ss_size=0}) = 0
[pid 125168] mmap(NULL, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f556525f000
[pid 125168] mprotect(0x7f556525f000, 4096, PROT_NONE) = 0
[pid 125168] sigaltstack({ss_sp=0x7f5565260000, ss_flags=0, ss_size=8192},
NULL) = 0
[pid 125168] recvmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\0\0\1\0\0\0\0\0\0\0", iov_len=12}], msg_iovlen=1,
msg_controllen=0, msg_flags=0}, 0) = 12
[pid 125168] sendmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\0\0\5\0\0\0\10\0\0\0", iov_len=12},
{iov_base="\0\0\0t\1\0\0\0", iov_len=8}], msg_iovlen=2, msg_controllen=0,
msg_flags=0}, MSG_NOSIGNAL) = 20
[pid 125168] recvmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\17\0\0\0\1\0\0\0\0\0\0\0", iov_len=12}], msg_iovlen=1,
msg_controllen=0, msg_flags=0}, 0) = 12
[pid 125168] sendmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\17\0\0\0\5\0\0\0\10\0\0\0", iov_len=12},
{iov_base="+\244\10\0\0\0\0\0", iov_len=8}], msg_iovlen=2,
msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 20
[pid 125168] recvmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\20\0\0\0\1\0\0\0\10\0\0\0", iov_len=12}],
msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 12
[pid 125168] recvmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="+\244\10\0\0\0\0\0", iov_len=8}], msg_iovlen=1,
msg_controllen=0, msg_flags=0}, 0) = 8
[pid 125168] recvmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\21\0\0\0\1\0\0\0\0\0\0\0", iov_len=12}], msg_iovlen=1,
msg_controllen=0, msg_flags=0}, 0) = 12
[pid 125168] sendmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\21\0\0\0\5\0\0\0\10\0\0\0", iov_len=12},
{iov_base="\2\0\0\0\0\0\0\0", iov_len=8}], msg_iovlen=2, msg_controllen=0,
msg_flags=0}, MSG_NOSIGNAL) = 20
[pid 125168] recvmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="$\0\0\0\1\0\0\0\0\0\0\0", iov_len=12}], msg_iovlen=1,
msg_controllen=0, msg_flags=0}, 0) = 12
[pid 125168] sendmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="$\0\0\0\5\0\0\0\10\0\0\0", iov_len=12},
{iov_base="\375\1\0\0\0\0\0\0", iov_len=8}], msg_iovlen=2,
msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 20
[pid 125168] recvmsg(11, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\25\0\0\0\t\0\0\0\0\0\0\0", iov_len=12}], msg_iovlen=1,
msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS,
cmsg_data=[13]}], msg_controllen=24, msg_flags=0}, 0) = 12
[pid 125168] getsockopt(13, SOL_SOCKET, SO_DOMAIN, [0], [4]) = 55
[pid 124978] <... epoll_wait resumed> <unfinished ...>) = ?
[pid 124977] <... futex resumed>)       = ?
[pid 125168] +++ killed by SIGSYS (core dumped) +++
[pid 124978] +++ killed by SIGSYS (core dumped) +++

Thanks!

On Mon, Aug 10, 2026 at 11:51 AM Debian Bug Tracking System <
owner at bugs.debian.org> wrote:

> Thank you for filing a new Bug report with Debian.
>
> You can follow progress on this Bug here: 1144050:
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1144050.
>
> This is an automatically generated reply to let you know your message
> has been received.
>
> Your message is being forwarded to the package maintainers and other
> interested parties for their attention; they will reply in due course.
>
> As you requested using X-Debbugs-CC, your message was also forwarded to
>   j.andradas at gmail.com
> (after having been given a Bug report number, if it did not have one).
>
> Your message has been sent to the package maintainer(s):
>  pkg-rust-maintainers at alioth-lists.debian.net
>
> If you wish to submit further information on this problem, please
> send it to 1144050 at bugs.debian.org.
>
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>
> --
> 1144050: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1144050
> Debian Bug Tracking System
> Contact owner at bugs.debian.org with problems
>

-- 
Jonás Andradas

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