Re: [PATCH net v3] tun/tap & vhost-net: make qdisc backpressure opt-in via IFF_BACKPRESSURE
Simon Schippers <[email protected]>
| Newsgroups | gmane.linux.documentation,gmane.linux.network,gmane.linux.kernel,gmane.linux.ltp |
|---|---|
| Message-ID | <[email protected]> |
On 7/15/26 16:01, kernel test robot wrote:
>
>
> Hello,
>
> kernel test robot noticed "ltp.ioctl03.fail" on:
ioctl03.c does not know about IFF_BACKPRESSURE which is introduced here,
consequently it fails.
See [1] where it compares TUN features with known_flags.
Thanks.
[1] Link: https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/ioctl/ioctl03.c#L82
>
> commit: 09154ff2072e36b86ba2d92d436b7f27df153ed1 ("[PATCH net v3] tun/tap & vhost-net: make qdisc backpressure opt-in via IFF_BACKPRESSURE")
> url: https://github.com/intel-lab-lkp/linux/commits/Simon-Schippers/tun-tap-vhost-net-make-qdisc-backpressure-opt-in-via-IFF_BACKPRESSURE/20260709-181234
> base: https://git.kernel.org/cgit/linux/kernel/git/davem/net.git fabb881df322da25442f98d23f5fa371e3c78ec4
> patch link: https://lore.kernel.org/all/[email protected]/
> patch subject: [PATCH net v3] tun/tap & vhost-net: make qdisc backpressure opt-in via IFF_BACKPRESSURE
>
> in testcase: ltp
> version:
> with following parameters:
>
> disk: 1HDD
> fs: ext4
> test: syscalls-03
>
>
>
> config: x86_64-rhel-9.4-ltp
> compiler: gcc-14
> test machine: 4 threads 1 sockets Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz (Ivy Bridge) with 8G memory
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <[email protected]>
> | Closes: https://lore.kernel.org/oe-lkp/[email protected]
>
>
> ....
>
> [1;37mgetuid03: [0m[1;32mpass[0m (0.028s)
> [1;37mioctl03: [0m[1;31mfail[0m (0.047s) <-----
> [1;37mioctl05: [0m[1;32mpass[0m (0.471s)
>
> ....
>
> Execution time: 3m 35s
>
> Disconnecting from SUT: default
>
> Target information
> ──────────────────
> Kernel: Linux 7.2.0-rc1+ #1 SMP PREEMPT_DYNAMIC Sun Jul 12 07:25:38 CST 2026
> Cmdline: ip=::::lkp-ivb-d04::dhcp
> root=/dev/ram0
> RESULT_ROOT=/result/ltp/1HDD-ext4-syscalls-03/lkp-ivb-d04/debian-13-x86_64-20250902.cgz/x86_64-rhel-9.4-ltp/gcc-14/09154ff2072e36b86ba2d92d436b7f27df153ed1/0
> BOOT_IMAGE=/pkg/linux/x86_64-rhel-9.4-ltp/gcc-14/09154ff2072e36b86ba2d92d436b7f27df153ed1/vmlinuz-7.2.0-rc1+
> branch=linux-devel/devel-hourly-20260709-190759
> job=/lkp/jobs/scheduled/lkp-ivb-d04/ltp-1HDD-ext4-syscalls-03-debian-13-x86_64-20250902.cgz-09154ff2072e-20260712-19649-tc8bu6-0.yaml
> user=lkp
> ARCH=x86_64
> kconfig=x86_64-rhel-9.4-ltp
> commit=09154ff2072e36b86ba2d92d436b7f27df153ed1
> intremap=posted_msi
> max_uptime=7200
> LKP_SERVER=internal-lkp-server
> nokaslr
> selinux=0
> debug
> apic=debug
> sysrq_always_enabled
> rcupdate.rcu_cpu_stall_timeout=100
> net.ifnames=0
> printk.devkmsg=on
> panic=-1
> softlockup_panic=1
> nmi_watchdog=panic
> oops=panic
> load_ramdisk=2
> prompt_ramdisk=0
> drbd.minor_count=8
> systemd.log_level=err
> ignore_loglevel
> console=tty0
> earlyprintk=ttyS0,115200
> console=ttyS0,115200
> vga=normal
> rw
> keep_initrds=/osimage/pkg/debian-13-x86_64-20250902.cgz/ltp-x86_64-ed2758122-1_20260711.cgz
> acpi_rsdp=0x000f0490
> Machine: unknown
> Arch: x86_64
> RAM: 6895596 kB
> Swap: 0 kB
> Distro: debian 13
>
> ────────────────────────
> TEST SUMMARY
> ────────────────────────
> Suite: syscalls-03
> Runtime: 3m 24s
> Runs: 183
>
> Results:
> Passed: 2144
> Failed: 1
> Broken: 0
> Skipped: 222
> Warnings: 0
>
> [1;31mFailures:[0m
> • ioctl03
>
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20260715/[email protected]
>
>
>