XPost: linux.debian.bugs.dist
From: Damir.Mansurov@oktetlabs.ru
Hi Salvatore,
On 1/21/26 08:01, Salvatore Bonaccorso wrote:
> Control: severity -1 important
> Control: tags -1 + moreinfo
>
> Hi Damir,
>
> On Tue, Jan 20, 2026 at 03:12:12PM +0300, Damir Mansurov wrote:
>
> Thanks for the report. A couple of questions:
>
> 6.17.13-1 is not the recent kernel (it is in backports) but still
> please test with the current 6.18.5-1 from unstable to confirm if the
> problem persist (please do with both the rt and the normal kernel).
>
> If the problem is triggered as well in 6.18.y from unstable, then it
> would be ideal to confirm the issue is as well present in mainline, so
> test the kernel from experimental (6.19~rc5-1~exp1).
>
> Is this an experienced regression from earlier version? If so from
> which?
The last "good" kernel for me is 6.15, I see the issue starting from 6.17
kernels (RT and non-RT) and on latest 6.19-rt-amd64 6.19~rc5-1~exp1.
But on non-RT kernels this Call Trace is a bit different:
```
[ 364.028512] INFO: task ethtool:1442 blocked for more than 120 seconds.
[ 364.035075] Tainted: G W 6.17.13+deb14-amd64 #1
Debian 6.17.13-1
[ 364.043097] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 364.050958] task:ethtool state:D stack:0 pid:1442 tgid:1442
ppid:1387 task_flags:0x400000 flags:0x00004002
[ 364.062069] Call Trace:
[ 364.064535]
[ 364.066645] __schedule+0x45c/0xd20
[ 364.071084] schedule+0x27/0xd0
[ 364.074397] schedule_preempt_disabled+0x15/0x30
[ 364.079145] __mutex_lock.constprop.0+0x530/0xa40
[ 364.083868] efx_mcdi_rx_pull_rss_config+0x28/0x60 [sfc]
[ 364.089241] ? rss_get_data_alloc+0x63/0xa0
[ 364.093498] efx_ethtool_get_rxfh+0x3b/0xd0 [sfc]
[ 364.098243] rss_prepare.isra.0+0x1c9/0x330
[ 364.103014] ethnl_default_doit+0x147/0x3f0
[ 364.107339] genl_family_rcv_msg_doit+0xff/0x160
[ 364.111987] genl_rcv_msg+0x1aa/0x2b0
[ 364.115754] ? __pfx_ethnl_default_doit+0x10/0x10
[ 364.120481] ? __pfx_genl_rcv_msg+0x10/0x10
[ 364.125291] netlink_rcv_skb+0x5c/0x110
[ 364.129733] genl_rcv+0x28/0x40
[ 364.133010] netlink_unicast+0x288/0x3c0
[ 364.136952] ? __alloc_skb+0xdb/0x1a0
[ 364.141215] netlink_sendmsg+0x20d/0x430
[ 364.145277] __sys_sendto+0x1f5/0x200
[ 364.148952] __x64_sys_sendto+0x24/0x30
[ 364.152842] do_syscall_64+0x82/0x320
[ 364.156635] ? mod_memcg_lruvec_state+0xe7/0x2e0
[ 364.161274] ? folio_wait_bit_common+0x2a7/0x320
[ 364.166482] ? __lruvec_stat_mod_folio+0x85/0xd0
[ 364.171242] ? xas_load+0x11/0x100
[ 364.174663] ? xas_find+0x83/0x1b0
[ 364.178666] ? next_uptodate_folio+0xa0/0x350
[ 364.183171] ? percpu_counter_add_batch+0x4a/0xb0
[ 364.187900] ? filemap_map_pages+0x53e/0x690
[ 364.192495] ? do_fault+0x34c/0x5a0
[ 364.196113] ? __handle_mm_fault+0x8db/0xef0
[ 364.201555] ? mt_find+0x21f/0x590
[ 364.205094] ? count_memcg_events+0xd6/0x220
[ 364.209382] ? handle_mm_fault+0x1d6/0x2d0
[ 364.214079] ? do_user_addr_fault+0x21a/0x690
[ 364.218847] ? exc_page_fault+0x74/0x180
[ 364.223178] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 364.228608] RIP: 0033:0x7feb25e91eb2
[ 364.232605] RSP: 002b:00007ffe6f478f50 EFLAGS: 00000202 ORIG_RAX:
000000000000002c
[ 364.240556] RAX: ffffffffffffffda RBX: 00007ffe6f479080 RCX:
0007feb25e91eb2
[ 364.248105] RDX: 0000000000000028 RSI: 000055a078bd4420 RDI:
000000000000003
[ 364.255663] RBP: 000055a078bd4310 R08: 00007feb26107000 R09:
00000000000000c
[ 364.263283] R10: 0000000000000000 R11: 0000000000000202 R12:
00055a078bd43c0
[ 364.270864] R13: 000055a078bd43b0 R14: 0000000000000000 R15:
00055a0559a41dd
[ 364.278392]
```
>
> Futhermore the kernel is tained with OOT module, afaics this might be
> sfc_resource. That is you still would need to check if the problem is
> trigerable without loading OOT module.
Oops, I removed the OOT modules and still see this problem:
```
[ 262.974262] ------------[ cut here ]------------
[ 262.974265] rtmutex deadlock detected
[ 262.974270] WARNING: CPU: 5 PID: 1522 at kernel/locking/rtmutex.c:1674
__rt_mutex_slowlock_locked.constprop.0+0x1e8/0x220
[ 262.974278] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs lockd
grace netfs nft_masq nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6
nf_defrag_ipv4 bridge nf_tables 8021q garp stp llc mrp binfmt_misc
intel_rapl_msr intel_rapl_common sb_edac x86_pkg_temp_thermal intel_powerclamp
coretemp
kvm_intel kvm evdev irqbypass ghash_clmulni_intel aesni_intel rapl ipmi_ssif
intel_cstate mgag200 vga16fb intel_uncore vgastate drm_client_lib pcspkr
drm_shmem_helper acpi_cpufreq mei_me drm_kms_helper mei button sg acpi_ipmi
ipmi_si ipmi_watchdog ipmi_devintf ipmi_msghandler drm efi_pstore auth_rpcgss
configfs sunrpc nfnetlink autofs4 ext4 crc16 mbcache jbd2 crc32c_cryptoapi
sd_mod iTCO_wdt intel_pmc_bxt iTCO_vendor_support isci watchdog libsas ahci
psmouse
libahci scsi_transport_sas serio_raw igb libata ehci_pci sfc ehci_hcd
i2c_algo_bit wmi scsi_mod usbcore i2c_i801 scsi_common mtd i2c_smbus ioatdma
usb_common
lpc_ich dca
[ 262.974338] CPU: 5 UID: 1100 PID: 1522 Comm: ethtool Tainted: G
W 6.17.13+deb14-rt-amd64 #1 PREEMPT_{RT,(full)} Debian 6.17.13-1
[ 262.974341] Tainted: [W]=WARN
[ 262.974342] Hardware name: Supermicro X9SRE/X9SRE-3F/X9SRi/X9
Ri-3F/X9SRE/X9SRE-3F/X9SRi/X9SRi-3F, BIOS 3.0a 01/03/2014
[ 262.974344] RIP: 0010:__rt_mutex_slowlock_locked.constprop.0+0x1e8/0x220
[continued in next message]
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