Subject: Re: spurious (?) mce Hardware Error messages in v6.19

From: Bert Karwatzki <[email-masked]>
Date: Fri, 13 Feb 2026 13:45:23 +0100

It happened again, this time on next-20260212 after about 3.5h:

Error message:
2026-02-13T12:47:34.505714+01:00 [T449218] mce: [Hardware Error]: Machine check events logged
2026-02-13T12:47:34.505729+01:00 [T449218] [Hardware Error]: Deferred error, no action required.
2026-02-13T12:47:34.505731+01:00 [T449218] [Hardware Error]: CPU:0 (19:50:0) MC11_STATUS[-|-|-|AddrV|-|-|-|Deferred|-|-]: 0x840090c800c98185
2026-02-13T12:47:34.505733+01:00 [T449218] [Hardware Error]: Error Addr: 0x003bd7a800000020
2026-02-13T12:47:34.505734+01:00 [T449218] [Hardware Error]: IPID: 0x000700b040000000
2026-02-13T12:47:34.505736+01:00 [T449218] [Hardware Error]: L3 Cache Ext. Error Code: 9
2026-02-13T12:47:34.505747+01:00 [T449218] [Hardware Error]: cache level: L1, tx: DATA

Output of
$ cat /proc/interrupts | grep -E "THR|MCP|MCE|DFR"
 THR:          0          0          0          0          0          0          0          0          0          0          0          0          0          0
0          0   Threshold APIC interrupts
 DFR:          0          0          0          0          0          0          0          0          0          0          0          0          0          0
0          0   Deferred Error APIC interrupts
 MCE:          0          0          0          0          0          0          0          0          0          0          0          0          0          0
0          0   Machine check exceptions
 MCP:         48         48         48         48         48         48         48         48         48         48         48         48         48         48
48         48   Machine check polls

Output of (the non-zero error_count values {72,3165, 72,9} are
the same asin my mail 15.9.2025 so these do not change)
# find /sys/devices/system/machinecheck/ -name error_count -print -exec cat {} \;

/sys/devices/system/machinecheck/machinecheck15/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck15/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck15/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck15/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck15/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck15/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck2/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck2/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck2/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck2/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck2/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck2/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck13/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck13/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck13/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck13/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck13/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck13/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l3_cache_0/l3_cache_0/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l3_cache_7/l3_cache_7/error_count
72
/sys/devices/system/machinecheck/machinecheck0/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck0/umc_1/dram_ecc/error_count
0
/sys/devices/system/machinecheck/machinecheck0/umc_1/misc_umc/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l3_cache_5/l3_cache_5/error_count
0
/sys/devices/system/machinecheck/machinecheck0/pie/pie/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l3_cache_3/l3_cache_3/error_count
0
/sys/devices/system/machinecheck/machinecheck0/coherent_slave_0/coherent_slave_0/error_count
0
/sys/devices/system/machinecheck/machinecheck0/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l3_cache_1/l3_cache_1/error_count
0
/sys/devices/system/machinecheck/machinecheck0/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l3_cache_6/l3_cache_6/error_count
3165
/sys/devices/system/machinecheck/machinecheck0/umc_0/dram_ecc/error_count
0
/sys/devices/system/machinecheck/machinecheck0/umc_0/misc_umc/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l3_cache_4/l3_cache_4/error_count
72
/sys/devices/system/machinecheck/machinecheck0/coherent_slave_1/coherent_slave_1/error_count
0
/sys/devices/system/machinecheck/machinecheck0/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck0/l3_cache_2/l3_cache_2/error_count
9
/sys/devices/system/machinecheck/machinecheck0/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck11/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck11/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck11/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck11/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck11/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck11/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck9/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck9/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck9/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck9/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck9/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck9/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck7/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck7/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck7/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck7/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck7/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck7/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck5/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck5/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck5/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck5/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck5/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck5/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck3/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck3/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck3/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck3/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck3/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck3/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck14/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck14/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck14/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck14/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck14/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck14/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck1/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck1/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck1/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck1/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck1/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck1/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck12/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck12/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck12/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck12/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck12/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck12/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck10/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck10/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck10/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck10/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck10/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck10/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck8/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck8/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck8/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck8/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck8/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck8/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck6/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck6/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck6/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck6/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck6/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck6/decode_unit/decode_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck4/execution_unit/execution_unit/error_count
0
/sys/devices/system/machinecheck/machinecheck4/insn_fetch/insn_fetch/error_count
0
/sys/devices/system/machinecheck/machinecheck4/floating_point/floating_point/error_count
0
/sys/devices/system/machinecheck/machinecheck4/load_store/load_store/error_count
0
/sys/devices/system/machinecheck/machinecheck4/l2_cache/l2_cache/error_count
0
/sys/devices/system/machinecheck/machinecheck4/decode_unit/decode_unit/error_count
0

I also did run memtest86+, 5 complete runs (~4.5h) passed without fail.

Bert Karwatzki