Downloader: see much `tryCreateMorePieceHashers` goroutines

[AskAlexSharov]

Recent gnosis crush report was 700K lines.

cat /erigon-logs/erigon-process.log.2025-02-26 | grep tryCreateMorePieceHashers | wc -l
8722

Part of it:

goroutine 4116 gp=0xc0001da8c0 m=nil [select, 1237 minutes]:
runtime.gopark(0xc040da6760?, 0x2?, 0x80?, 0xd1?, 0xc040da6674?)
	runtime/proc.go:435 +0xce fp=0xc040da64e8 sp=0xc040da64c8 pc=0x49d04e
runtime.selectgo(0xc040da6760, 0xc040da6670, 0xc00103d320?, 0x0, 0x100000000000000?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc040da6620 sp=0xc040da64e8 pc=0x479737
github.com/anacrolix/torrent.(*Torrent).processHashResults(0xc081938808, 0xc07c3d2ee0)
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2910 +0x1af fp=0xc040da67c0 sp=0xc040da6620 pc=0x106f9af
github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1.gowrap2()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x25 fp=0xc040da67e0 sp=0xc040da67c0 pc=0x106eda5
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc040da67e8 sp=0xc040da67e0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1 in goroutine 4049
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x127

goroutine 13118 gp=0xc0001daa80 m=nil [select, 1237 minutes]:
runtime.gopark(0xc0918077a0?, 0x2?, 0x60?, 0x76?, 0xc09180778c?)
	runtime/proc.go:435 +0xce fp=0xc091807618 sp=0xc0918075f8 pc=0x49d04e
runtime.selectgo(0xc0918077a0, 0xc091807788, 0xc091ad2ab4?, 0x0, 0x78dc?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc091807750 sp=0xc091807618 pc=0x479737
github.com/anacrolix/torrent.(*trackerScraper).Run.func1()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/tracker_scraper.go:248 +0xb0 fp=0xc0918077e0 sp=0xc091807750 pc=0x1079750
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc0918077e8 sp=0xc0918077e0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*trackerScraper).Run in goroutine 13394
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/tracker_scraper.go:246 +0xfe

goroutine 4114 gp=0xc0001dac40 m=nil [select, 1237 minutes]:
runtime.gopark(0xc040da5f60?, 0x2?, 0x1f?, 0x66?, 0xc040da5e74?)
	runtime/proc.go:435 +0xce fp=0xc040da5ce8 sp=0xc040da5cc8 pc=0x49d04e
runtime.selectgo(0xc040da5f60, 0xc040da5e70, 0xc00103d320?, 0x0, 0x100000000000000?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc040da5e20 sp=0xc040da5ce8 pc=0x479737
github.com/anacrolix/torrent.(*Torrent).processHashResults(0xc081dab808, 0xc07c3d2e70)
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2910 +0x1af fp=0xc040da5fc0 sp=0xc040da5e20 pc=0x106f9af
github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1.gowrap2()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x25 fp=0xc040da5fe0 sp=0xc040da5fc0 pc=0x106eda5
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc040da5fe8 sp=0xc040da5fe0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1 in goroutine 4071
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x127

goroutine 9284 gp=0xc0001dae00 m=nil [select, 1237 minutes]:
runtime.gopark(0xc095ae6f60?, 0x2?, 0x8f?, 0x2c?, 0xc095ae6e74?)
	runtime/proc.go:435 +0xce fp=0xc095ae6ce8 sp=0xc095ae6cc8 pc=0x49d04e
runtime.selectgo(0xc095ae6f60, 0xc095ae6e70, 0xc00103d320?, 0x0, 0x100000000000000?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc095ae6e20 sp=0xc095ae6ce8 pc=0x479737
github.com/anacrolix/torrent.(*Torrent).processHashResults(0xc0961c3008, 0xc0427d0fc0)
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2910 +0x1af fp=0xc095ae6fc0 sp=0xc095ae6e20 pc=0x106f9af
github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1.gowrap2()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x25 fp=0xc095ae6fe0 sp=0xc095ae6fc0 pc=0x106eda5
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc095ae6fe8 sp=0xc095ae6fe0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1 in goroutine 9265
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x127

goroutine 4091 gp=0xc0001dafc0 m=nil [select, 1237 minutes]:
runtime.gopark(0xc0411a8760?, 0x2?, 0xcb?, 0x8?, 0xc0411a8674?)
	runtime/proc.go:435 +0xce fp=0xc0411a84e8 sp=0xc0411a84c8 pc=0x49d04e
runtime.selectgo(0xc0411a8760, 0xc0411a8670, 0xc00103d320?, 0x0, 0x100000000000000?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc0411a8620 sp=0xc0411a84e8 pc=0x479737
github.com/anacrolix/torrent.(*Torrent).processHashResults(0xc081647408, 0xc000b1b7a0)
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2910 +0x1af fp=0xc0411a87c0 sp=0xc0411a8620 pc=0x106f9af
github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1.gowrap2()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x25 fp=0xc0411a87e0 sp=0xc0411a87c0 pc=0x106eda5
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc0411a87e8 sp=0xc0411a87e0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1 in goroutine 4090
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x127

goroutine 13080 gp=0xc0001db180 m=nil [select, 1237 minutes]:
runtime.gopark(0xc091347fa0?, 0x2?, 0x60?, 0x7e?, 0xc091347f8c?)
	runtime/proc.go:435 +0xce fp=0xc091347e18 sp=0xc091347df8 pc=0x49d04e
runtime.selectgo(0xc091347fa0, 0xc091347f88, 0xfe00000?, 0x0, 0x10000000?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc091347f50 sp=0xc091347e18 pc=0x479737
github.com/anacrolix/torrent.(*trackerScraper).Run.func1()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/tracker_scraper.go:248 +0xb0 fp=0xc091347fe0 sp=0xc091347f50 pc=0x1079750
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc091347fe8 sp=0xc091347fe0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*trackerScraper).Run in goroutine 13037
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/tracker_scraper.go:246 +0xfe

goroutine 13119 gp=0xc0001db340 m=nil [select, 1237 minutes]:
runtime.gopark(0xc0918dc7a0?, 0x2?, 0x60?, 0xc6?, 0xc0918dc78c?)
	runtime/proc.go:435 +0xce fp=0xc0918dc618 sp=0xc0918dc5f8 pc=0x49d04e
runtime.selectgo(0xc0918dc7a0, 0xc0918dc788, 0x0?, 0x0, 0x0?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc0918dc750 sp=0xc0918dc618 pc=0x479737
github.com/anacrolix/torrent.(*trackerScraper).Run.func1()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/tracker_scraper.go:248 +0xb0 fp=0xc0918dc7e0 sp=0xc0918dc750 pc=0x1079750
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc0918dc7e8 sp=0xc0918dc7e0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*trackerScraper).Run in goroutine 13462
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/tracker_scraper.go:246 +0xfe

goroutine 4147 gp=0xc0001db500 m=nil [select, 1237 minutes]:
runtime.gopark(0xc081d11760?, 0x2?, 0x2e?, 0x7d?, 0xc081d11674?)
	runtime/proc.go:435 +0xce fp=0xc081d114e8 sp=0xc081d114c8 pc=0x49d04e
runtime.selectgo(0xc081d11760, 0xc081d11670, 0xc00103d320?, 0x0, 0x100000000000000?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc081d11620 sp=0xc081d114e8 pc=0x479737
github.com/anacrolix/torrent.(*Torrent).processHashResults(0xc0815ad408, 0xc000b1b960)
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2910 +0x1af fp=0xc081d117c0 sp=0xc081d11620 pc=0x106f9af
github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1.gowrap2()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x25 fp=0xc081d117e0 sp=0xc081d117c0 pc=0x106eda5
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc081d117e8 sp=0xc081d117e0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1 in goroutine 4032
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x127

goroutine 6792 gp=0xc0001db6c0 m=nil [select, 1237 minutes]:
runtime.gopark(0xc08cdbaf60?, 0x2?, 0x5d?, 0xef?, 0xc08cdbae74?)
	runtime/proc.go:435 +0xce fp=0xc08cdbace8 sp=0xc08cdbacc8 pc=0x49d04e
runtime.selectgo(0xc08cdbaf60, 0xc08cdbae70, 0xc00103d320?, 0x0, 0x100000000000000?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc08cdbae20 sp=0xc08cdbace8 pc=0x479737
github.com/anacrolix/torrent.(*Torrent).processHashResults(0xc08cf82408, 0xc0430e71f0)
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2910 +0x1af fp=0xc08cdbafc0 sp=0xc08cdbae20 pc=0x106f9af
github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1.gowrap2()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x25 fp=0xc08cdbafe0 sp=0xc08cdbafc0 pc=0x106eda5
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc08cdbafe8 sp=0xc08cdbafe0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1 in goroutine 6791
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x127

goroutine 2952 gp=0xc0001db880 m=nil [select, 1237 minutes]:
runtime.gopark(0xc04102e760?, 0x2?, 0xcf?, 0x31?, 0xc04102e674?)
	runtime/proc.go:435 +0xce fp=0xc04102e4e8 sp=0xc04102e4c8 pc=0x49d04e
runtime.selectgo(0xc04102e760, 0xc04102e670, 0xc00103d320?, 0x0, 0x100000000000000?, 0x1)
	runtime/select.go:351 +0x837 fp=0xc04102e620 sp=0xc04102e4e8 pc=0x479737
github.com/anacrolix/torrent.(*Torrent).processHashResults(0xc040f17c08, 0xc081316070)
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2910 +0x1af fp=0xc04102e7c0 sp=0xc04102e620 pc=0x106f9af
github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1.gowrap2()
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x25 fp=0xc04102e7e0 sp=0xc04102e7c0 pc=0x106eda5
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc04102e7e8 sp=0xc04102e7e0 pc=0x4a4ae1
created by github.com/anacrolix/torrent.(*Torrent).tryCreateMorePieceHashers.func1 in goroutine 2951
	github.com/anacrolix/torrent@v1.52.6-0.20231201115409-7ea994b6bbd8/torrent.go:2791 +0x127