flashrom

When flashrom runs with --progress argument in the command line, it shows % progress for all operations. % is working nicely for read and verify operations.
However for erase and write operations % starts with 0, goes up and then goes backwards to 0 again. By its nature, % progress should not go backwards.

Bug can be reproduced with dummyflasher.

Small repro case with just erase:

$ ./flashrom -p dummy:emulate=W25Q128FV -E --progress
flashrom v1.2-759-gcba5de5 on Linux 5.16.18-1rodete2-amd64 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found Winbond flash chip "W25Q128.V" (16384 kB, SPI) on dummy.

Erasing and writing flash chip... [READ] 100% complete... [READ] 0% complete...
Erase/write done.

Longer repro case where you can see that read and verify works, but erase and write do not:

$ ./flashrom -p dummy:emulate=W25Q128FV,image=/tmp/rom -w /tmp/16m_rand.bin --progress
flashrom v1.2-763-gb10d55049 on Linux 5.18.1-arch1-1 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found Winbond flash chip "W25Q128.V" (16384 kB, SPI) on dummy.

Reading old flash chip contents... [READ] 0% complete... [READ] 1% complete... [READ] 2% complete... [READ] 3% complete... [READ] 4% complete... [READ] 5% complete... [READ] 6% complete... [READ] 7% complete... [READ] 8% complete... [READ] 9% complete... [READ] 10% complete... [READ] 11% complete... [READ] 12% complete... [READ] 13% complete... [READ] 14% complete... [READ] 15% complete... [READ] 16% complete... [READ] 17% complete... [READ] 18% complete... [READ] 19% complete... [READ] 20% complete... [READ] 21% complete... [READ] 22% complete... [READ] 23% complete... [READ] 24% complete... [READ] 25% complete... [READ] 26% complete... [READ] 27% complete... [READ] 28% complete... [READ] 29% complete... [READ] 30% complete... [READ] 31% complete... [READ] 32% complete... [READ] 33% complete... [READ] 34% complete... [READ] 35% complete... [READ] 36% complete... [READ] 37% complete... [READ] 38% complete... [READ] 39% complete... [READ] 40% complete... [READ] 41% complete... [READ] 42% complete... [READ] 43% complete... [READ] 44% complete... [READ] 45% complete... [READ] 46% complete... [READ] 47% complete... [READ] 48% complete... [READ] 49% complete... [READ] 50% complete... [READ] 51% complete... [READ] 52% complete... [READ] 53% complete... [READ] 54% complete... [READ] 55% complete... [READ] 56% complete... [READ] 57% complete... [READ] 58% complete... [READ] 59% complete... [READ] 60% complete... [READ] 61% complete... [READ] 62% complete... [READ] 63% complete... [READ] 64% complete... [READ] 65% complete... [READ] 66% complete... [READ] 67% complete... [READ] 68% complete... [READ] 69% complete... [READ] 70% complete... [READ] 71% complete... [READ] 72% complete... [READ] 73% complete... [READ] 74% complete... [READ] 75% complete... [READ] 76% complete... [READ] 77% complete... [READ] 78% complete... [READ] 79% complete... [READ] 80% complete... [READ] 81% complete... [READ] 82% complete... [READ] 83% complete... [READ] 84% complete... [READ] 85% complete... [READ] 86% complete... [READ] 87% complete... [READ] 88% complete... [READ] 89% complete... [READ] 90% complete... [READ] 91% complete... [READ] 92% complete... [READ] 93% complete... [READ] 94% complete... [READ] 95% complete... [READ] 96% complete... [READ] 97% complete... [READ] 98% complete... [READ] 99% complete... [READ] 100% complete... done.
Erasing and writing flash chip... [WRITE] 6% complete... [READ] 0% complete... [WRITE] 0% complete... Erase/write done.
Verifying flash... [READ] 1% complete... [READ] 2% complete... [READ] 3% complete... [READ] 4% complete... [READ] 5% complete... [READ] 6% complete... [READ] 7% complete... [READ] 8% complete... [READ] 9% complete... [READ] 10% complete... [READ] 11% complete... [READ] 12% complete... [READ] 13% complete... [READ] 14% complete... [READ] 15% complete... [READ] 16% complete... [READ] 17% complete... [READ] 18% complete... [READ] 19% complete... [READ] 20% complete... [READ] 21% complete... [READ] 22% complete... [READ] 23% complete... [READ] 24% complete... [READ] 25% complete... [READ] 26% complete... [READ] 27% complete... [READ] 28% complete... [READ] 29% complete... [READ] 30% complete... [READ] 31% complete... [READ] 32% complete... [READ] 33% complete... [READ] 34% complete... [READ] 35% complete... [READ] 36% complete... [READ] 37% complete... [READ] 38% complete... [READ] 39% complete... [READ] 40% complete... [READ] 41% complete... [READ] 42% complete... [READ] 43% complete... [READ] 44% complete... [READ] 45% complete... [READ] 46% complete... [READ] 47% complete... [READ] 48% complete... [READ] 49% complete... [READ] 50% complete... [READ] 51% complete... [READ] 52% complete... [READ] 53% complete... [READ] 54% complete... [READ] 55% complete... [READ] 56% complete... [READ] 57% complete... [READ] 58% complete... [READ] 59% complete... [READ] 60% complete... [READ] 61% complete... [READ] 62% complete... [READ] 63% complete... [READ] 64% complete... [READ] 65% complete... [READ] 66% complete... [READ] 67% complete... [READ] 68% complete... [READ] 69% complete... [READ] 70% complete... [READ] 71% complete... [READ] 72% complete... [READ] 73% complete... [READ] 74% complete... [READ] 75% complete... [READ] 76% complete... [READ] 77% complete... [READ] 78% complete... [READ] 79% complete... [READ] 80% complete... [READ] 81% complete... [READ] 82% complete... [READ] 83% complete... [READ] 84% complete... [READ] 85% complete... [READ] 86% complete... [READ] 87% complete... [READ] 88% complete... [READ] 89% complete... [READ] 90% complete... [READ] 91% complete... [READ] 92% complete... [READ] 93% complete... [READ] 94% complete... [READ] 95% complete... [READ] 96% complete... [READ] 97% complete... [READ] 98% complete... [READ] 99% complete... [READ] 100% complete... VERIFIED.