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Your message dated Tue, 03 Feb 2026 21:30:08 +0000
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and subject line Bug#1126015: fixed in linux 6.19~rc8-1~exp1
has caused the Debian Bug report #1126015,
regarding linux-image-6.17.13+deb14-rt-amd64: ethtool -x causes: rtmutex deadlock detected
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1126015: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1126015
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From: Damir Mansurov
To: Debian Bug Tracking System
Subject: linux-image-6.17.13+deb14-rt-amd64: ethtool -x causes: rtmutex deadlock detected
Message-ID: <176891113233.1085.14440184213728685693.reportbug@el
ond.oktetlabs.ru>
X-Mailer: reportbug 13.2.0
Date: Tue, 20 Jan 2026 15:12:12 +0300
Delivered-To: submit@bugs.debian.org
Package: src:linux
Version: 6.17.13-1
Severity: critical
Justification: breaks the whole system
X-Debbugs-Cc: debian-amd64@lists.debian.org, damir.mansurov@oktetlabs.ru
User: debian-amd64@lists.debian.org
Usertags: amd64
I am trying to read the receive flow hash indirection table from a NIC
serviced by the sfc driver and I get a hung system.
$ ethtool -x enp1s0f0np0
Jan 20 14:30:30 kernel: ------------[ cut here ]------------
Jan 20 14:30:30 kernel: rtmutex deadlock detected
Jan 20 14:30:30 kernel: WARNING: CPU: 2 PID: 1194 at kernel/lock
ng/rtmutex.c:1674 __rt_mutex_slowlock_locked.constprop.0+0x1e8/0x220
Jan 20 14:30:30 kernel: Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver
nfs lockd grace netfs 8021q garp stp llc mrp binfmt_misc nls_ascii nls_cp437
vfat fat intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal i
tel_powerclamp coretemp kvm_intel
kvm jc42 dell_smbios ppdev dell_wmi_descriptor platform_profile dcdbas
irqbypass ghash_clmulni_intel mgag200 aesni_intel drm_client_lib rapl
drm_shmem_helper at24 drm_kms_helper intel_cstate intel_uncore vga16fb
i2c_algo_bit vgastate pcspkr acpi_cpufreq
parport_pc parport intel_vbtn sparse_keymap joydev ipmi_ssif evdev button
ie31200_edac sg onload(OE) acpi_ipmi ipmi_si ipmi_watchdog sfc_resource(OE)
ipmi_devintf ipmi_msghandler drm efi_pstore configfs auth_rpcgss sunrpc
nfnetlink autofs4 ext4 crc16
mbcache jbd2 crc32c_cryptoapi hid_generic usbhid hid dm_mod sd_mod iTCO_wdt
ahci intel_pmc_bxt iTCO_vendor_support watchdog tg3 libahci xhci_pci ehci_pci
video sfc xhci_hcd libphy ehci_hcd wmi battery libata usbcore mdio_bus mtd
scsi_mod i2c_i801 fan usb_
common i2c_smbus scsi_common
Jan 20 14:30:30 kernel: lpc_ich
Jan 20 14:30:30 kernel: CPU: 2 UID: 1100 PID: 1194 Comm: ethtool Tainted:
G W OE 6.17.13+deb14-rt-amd64 #1 PREEMPT_{RT,(full)} Debian
6.17.13-1
Jan 20 14:30:30 kernel: Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
Jan 20 14:30:30 kernel: Hardware name: Dell Inc. PowerEdge R220/05Y15N, BIOS
1.4.0 10/23/2014
Jan 20 14:30:30 kernel: RIP: 0010:__rt_mutex_slowlock_locked.con
tprop.0+0x1e8/0x220
Jan 20 14:30:30 kernel: 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 5d a9 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
Jan 20 14:30:30 kernel: RSP: 0018:ffffcdc24208f5a0 EFLAGS: 00010246
Jan 20 14:30:30 kernel: RAX: 0000000000000000 RBX: ffff8b14d3888000 RCX:
0000000000000027
Jan 20 14:30:30 kernel: RDX: ffff8b1617f1ce88 RSI: 0000000000000001 RDI:
ffff8b1617f1ce80
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