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ASR920: SD card issues : "Timeout waiting for hardware interrupt."
The affected devices face any of these events: * Connectivity loss: SSH access is unavailable * IOSd logs for file system: %IOSXE_INFRA-6-AUXTHD_REQUEST: Too many outstanding requests for file system access * High CPU due to SSH: %PARSER-6-WMLRETRY: Write memory lock currently held by pid '###', automatic retry. -Process= "SSH Process", ipl= 0, pid= ### * Other logs: "Timeout waiting for hardware interrupt." * Kernel error messages: %IOSXE-3-PLATFORM: R0/0: kernel: [7392056.952991] mmc0: esdhc: ========= REGISTER DUMP ========== %IOSXE-3-PLATFORM: R0/0: kernel: [7392056.953119] mmcblk0: error -110 transferring data, sector ###, nr ##, card status 0xc00 %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.512932] Call Trace: %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.513067] [eb051d10] [c010c01c] __block_write_full_page+0x2a8/0x5c0 %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.513078] [eb051d70] [c0110478] blkdev_writepage+0x1c/0x2c %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.513093] [eb051d80] [c00aa828] __writepage+0x24/0x80 %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.513102] [eb051d90] [c00ab0c0] write_cache_pages+0x1fc/0x338 %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.513112] [eb051e10] [c00ab258] do_writepages+0x34/0x5c %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.513121] [eb051e20] [c0101f5c] writeback_single_inode+0x9c/0x268 %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.513131] [eb051e40] [c0102654] writeback_sb_inodes+0xd0/0x160 %IOSXE-4-PLATFORM: R0/0: kernel: [7392238.513140] [eb051e80] [c0102c2c] writeback_inodes_wb+0xd0/0x14c
The ASR920 includes an SD Card, when information is read or write into the card and there is a disconnection with the SD host controller we trigger the error. The ASR920 has to have the affected Linux Kernel version installed.
A reload alleviates the unresponsive state and physical reload is most workable approach
This is a bug in the Linux Kernel, the following documentation includes the details on the fix: 1)Errata - eSDHC 5 / A-008358 2)Errata - eSDHC9 / A-005055 3)Errata - A-009204 4)Errata - eSDHC 7 Cisco integrated the fixed Linux Kernel in version 16.9.3 and newer.