I can reproduce this issue with 4.13.0-37-generic. The debugfs info for the zip
driver shows that 2 requests are pending. Either the requests are not submitted
properly (Decomp Req Submitted=0) or
not completed (DOORBELL regs = 0).
root@crb1s:/sys/kernel/debug/thunderx_zip# cat zip_stats
ZIP Device 0 Stats
-----------------------------------
Comp Req Submitted : 0
Comp Req Completed : 0
Compress In Bytes : 0
Compressed Out Bytes : 0
Average Chunk size : 0
Average Compression ratio : 0
Decomp Req Submitted : 0
Decomp Req Completed : 0
Decompress In Bytes : 0
Decompressed Out Bytes : 0
Decompress Bad requests : 0
Pending Req : 2
---------------------------------
root@crb1s:/sys/kernel/debug/thunderx_zip# cat zip_regs
--------------------------------
ZIP Device 0 Registers
--------------------------------
ZIP_CMD_CTL : 0x0000000000000002
ZIP_THROTTLE : 0x0000000000000010
ZIP_CONSTANTS : 0x02017c0020060000
ZIP_QUE0_MAP : 0x0000000000000003
ZIP_QUE1_MAP : 0x0000000000000003
ZIP_QUE_ENA : 0x0000000000000003
ZIP_QUE_PRI : 0x0000000000000003
ZIP_QUE0_DONE : 0x0000000000000000
ZIP_QUE1_DONE : 0x0000000000000000
ZIP_QUE0_DOORBELL : 0x0000000000000000
ZIP_QUE1_DOORBELL : 0x0000000000000000
ZIP_QUE0_SBUF_ADDR : 0x00000000fa040100
ZIP_QUE1_SBUF_ADDR : 0x00000000fa042000
ZIP_QUE0_SBUF_CTL : 0x000003f100000000
ZIP_QUE1_SBUF_CTL : 0x000003f100000000
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https://bugs.launchpad.net/bugs/1755073
Title:
ubuntu_zram_smoke test will cause soft lockup on Artful ThunderX ARM64
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