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Bug#1126015: linux-image-6.17.13+deb14-rt-amd64: ethtool -x <sfc-net-driver-ifname> causes: rtmutex deadlock detected

Cross-posted to 2 groups.

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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]  <TASK> 

[  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: 00007feb25e91eb2 

[  364.248105] RDX: 0000000000000028 RSI: 000055a078bd4420 RDI: 0000000000000003 

[  364.255663] RBP: 000055a078bd4310 R08: 00007feb26107000 R09: 000000000000000c 

[  364.263283] R10: 0000000000000000 R11: 0000000000000202 R12: 000055a078bd43c0 

[  364.270864] R13: 000055a078bd43b0 R14: 0000000000000000 R15: 000055a0559a41dd 

[  364.278392]  </TASK>
```


> 
> 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/X9SRi-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
[  262.974347] Code: 00 4c 89 e6 48 89 ef e8 b6 35 ca 00 41 83 fd dd 0f 85 d7 fe ff ff 48 89 ef e8 f4 9c ca 00 48 c7 c7 6c 51 7d b1 e8 a8 00 f6 ff <0f> 0b 66 90 
b8 01 00 00 00 87 43 18 e8 c7 3e fb ff eb ef bf 01 00
[  262.974349] RSP: 0018:ffffd19302e2f870 EFLAGS: 00010246
[  262.974351] RAX: 0000000000000000 RBX: ffff8c5387910000 RCX: 0000000000000027
[  262.974352] RDX: ffff8c56ffd5ce88 RSI: 0000000000000001 RDI: ffff8c56ffd5ce80
[  262.974354] RBP: ffff8c53810e9b10 R08: 0000000000000000 R09: ffffd19302e2f648
[  262.974355] R10: ffffffffb20e3e48 R11: 00000000ffffefff R12: ffffd19302e2f870
[  262.974356] R13: 00000000ffffffdd R14: ffffd19302e2f918 R15: ffffffffb1368880
[  262.974358] FS:  00007f4403a9fb80(0000) GS:ffff8c574d141000(0000) knlGS:0000000000000000
[  262.974360] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  262.974361] CR2: 000055c79a144700 CR3: 0000000140494006 CR4: 00000000000626f0
[  262.974363] Call Trace:
[  262.974365]  <TASK>
[  262.974369]  rt_mutex_slowlock.constprop.0+0x4d/0xc0
[  262.974374]  efx_mcdi_rx_pull_rss_config+0x28/0x60 [sfc]
[  262.974410]  efx_ethtool_get_rxfh+0x3b/0xd0 [sfc]
[  262.974439]  rss_prepare.isra.0+0x1c9/0x330
[  262.974443]  ethnl_default_doit+0x147/0x3f0
[  262.974446]  genl_family_rcv_msg_doit+0xff/0x160
[  262.974452]  genl_rcv_msg+0x1aa/0x2b0
[  262.974455]  ? __pfx_ethnl_default_doit+0x10/0x10
[  262.974457]  ? __pfx_genl_rcv_msg+0x10/0x10
[  262.974460]  netlink_rcv_skb+0x5c/0x110
[  262.974465]  genl_rcv+0x28/0x40
[  262.974467]  netlink_unicast+0x28f/0x3c0
[  262.974470]  ? __alloc_skb+0xdb/0x1a0
[  262.974474]  netlink_sendmsg+0x20d/0x440
[  262.974478]  __sys_sendto+0x1f5/0x200
[  262.974483]  __x64_sys_sendto+0x24/0x30
[  262.974485]  do_syscall_64+0x82/0x320
[  262.974488]  ? count_memcg_events+0xd6/0x220
[  262.974492]  ? handle_mm_fault+0x1d6/0x2d0
[  262.974495]  ? do_user_addr_fault+0x21a/0x690
[  262.974499]  ? exc_page_fault+0x74/0x180
[  262.974503]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[  262.974505] RIP: 0033:0x7f4403b32eb2
[  262.974516] Code: 18 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 75 1a 83 e2 39 83 fa 08 75 12 e8 2b ff ff ff 0f 1f 00 49 89 ca 48 8b 44 24 20 0f 05 <48> 83 c4 18 
c3 66 0f 1f 84 00 00 00 00 00 48 83 ec 10 ff 74 24 18
[  262.974518] RSP: 002b:00007ffef9cea580 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[  262.974520] RAX: ffffffffffffffda RBX: 00007ffef9cea6b0 RCX: 00007f4403b32eb2
[  262.974521] RDX: 0000000000000028 RSI: 000055c7b2901420 RDI: 0000000000000003
[  262.974522] RBP: 000055c7b2901310 R08: 00007f4403cc7000 R09: 000000000000000c
[  262.974523] R10: 0000000000000000 R11: 0000000000000202 R12: 000055c7b29013c0
[  262.974525] R13: 000055c7b29013b0 R14: 0000000000000000 R15: 000055c79a1491dd
[  262.974527]  </TASK>
[  262.974528] ---[ end trace 0000000000000000 ]---
```

> 
> Regards,
> Salvatore

-- 
Damir Mansurov
Damir.Mansurov@oktetlabs.ru

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Bug#1126015: linux-image-6.17.13+deb14-rt-amd64: ethtool -x <sfc-net-driver-ifname> causes: rtmutex deadlock detected Damir Mansurov <Damir.Mansurov@oktetlabs.ru> - 2026-01-21 13:20 +0100

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