Description
On macOS, batch sync of multiple offline downloads always fails. Every item passes through "waiting to retry" and ends in "Failed" with no resume. Single downloads sometimes work (showing "waiting to retry" a few times but eventually complete).
After sync fails, the "Failed" state shows the progress it managed to complete (e.g. 70%), with pause and stop buttons. The pause button does nothing, and the only way to proceed is to click the stop button and restart it in the hope it completes this time.
Sync on other devices works without a problem. And jellyfin/reverse proxy shows no errors (only 200 and 206 response codes).
Fladder error logs in the app show only one error "SEVERE | Seerr server not configured".
Reproduction steps
1. Try to sync a few episodes on macOS.
Screenshots
No response
Logs
I have found only this diagnostic report, but not sure if it's related. There are a few like this (file backed memory dirtied over ...), but they are not generated every time.
Date/Time: 2026-05-07 13:56:42.329 +0200
End time: 2026-05-07 14:14:55.540 +0200
OS Version: macOS 26.3.1 (Build 25D2128)
Architecture: arm64e
Report Version: 67
Incident Identifier: 7E894F9D-54F9-494D-BACB-4E8D3DBCFD19
Data Source: Microstackshots
Shared Cache: 674DB25A-34B2-3C56-8BD4-7D78005B2F2E slid base address 0x1954a4000, slide 0x154a4000
Command: Fladder
Path: /Applications/Fladder.app/Contents/MacOS/Fladder
Identifier: nl.jknaapen.fladder
Version: 0.10.3 (630)
Is First Party: No
Beta Identifier: 431467F8-0DAA-58B7-922D-A6A591253715
Resource Coalition: "nl.jknaapen.fladder"(166123)
Architecture: arm64
Parent: UNKNOWN [1]
PID: 32483
Event: disk writes
Action taken: none
Writes: 34.36 GB of file backed memory dirtied over 1093 seconds (31.43 MB per second average), exceeding limit of 397.68 KB per second over 86400 seconds
Writes limit: 34.36 GB
Limit duration: 86400s
Writes caused: 34.36 GB
Writes duration: 1093s
Duration: 1093.21s
Duration Sampled: 1092.90s
Steps: 3276 (10.49 MB/step)
Hardware model: Mac16,13
Active cpus: 10
Memory size: 24 GB
HW page size: 16384
VM page size: 16384
Shared cache residency: 14.62% (785.11 MB / 5369.62 MB)
Time Since Boot: 4558067s
Time Awake Since Boot: 1213413s
Time Since Wake: 661s
Total CPU Time: 730.721s
Advisory levels: Battery -> 2, User -> 2, ThermalPressure -> 0, Combined -> 2
Free disk space: 312.54 GB/460.43 GB, low space threshold 3072 MB
Vnodes Available: 74.79% (196825/263168)
Models: none
Preferred User Language: en-US
Country Code: US
OS Cryptex File Extents: 1
Heaviest stack for the target process:
3276 thread_start + 8 (libsystem_pthread.dylib + 7080) [0x19597aba8]
3276 _pthread_start + 136 (libsystem_pthread.dylib + 27656) [0x19597fc08]
3276 ??? (FlutterMacOS + 10278196) [0x106659534]
3276 ??? (FlutterMacOS + 10428184) [0x10667df18]
3276 ??? (FlutterMacOS + 10427552) [0x10667dca0]
2804 ??? (FlutterMacOS + 9888552) [0x1065fa328]
2804 ??? (FlutterMacOS + 8930880) [0x106510640]
2804 ??? (FlutterMacOS + 9063112) [0x106530ac8]
2804 ??? (FlutterMacOS + 9076772) [0x106534024]
2804 write + 8 (libsystem_kernel.dylib + 18464) [0x195940820]
Powerstats for: Fladder [32483] [unique pid 430988]
UUID: B504DF04-A8C6-3056-9CE3-DACD760A8089
Path: /Applications/Fladder.app/Contents/MacOS/Fladder
Identifier: nl.jknaapen.fladder
Version: 0.10.3 (630)
Is First Party: No
Beta Identifier: 431467F8-0DAA-58B7-922D-A6A591253715
Resource Coalition: 3276 samples "nl.jknaapen.fladder"(166123)
Architecture: arm64
Parent: UNKNOWN [1]
UID: 501
Footprint: 894.17 MB -> 811.75 MB (-82.42 MB) (max 1199.23 MB )
Pageins: 23 pages
Start time: 2026-05-07 13:56:42.487 +0200
End time: 2026-05-07 14:14:55.387 +0200
Num samples: 3276 (100%)
Num threads: 91
Primary state: 2716 samples Frontmost App, Non-Suppressed, Kernel mode, Effective Thread QoS Default, Requested Thread QoS Default, Override Thread QoS Unspecified, p-core
User Activity: 0 samples Idle, 3276 samples Active
Power Source: 3276 samples on Battery, 0 samples on AC
3276 thread_start + 8 (libsystem_pthread.dylib + 7080) [0x19597aba8]
3276 _pthread_start + 136 (libsystem_pthread.dylib + 27656) [0x19597fc08]
3276 ??? (FlutterMacOS + 10278196) [0x106659534]
3276 ??? (FlutterMacOS + 10428184) [0x10667df18]
3276 ??? (FlutterMacOS + 10427552) [0x10667dca0]
2804 ??? (FlutterMacOS + 9888552) [0x1065fa328]
2804 ??? (FlutterMacOS + 8930880) [0x106510640]
2804 ??? (FlutterMacOS + 9063112) [0x106530ac8]
2804 ??? (FlutterMacOS + 9076772) [0x106534024]
2804 write + 8 (libsystem_kernel.dylib + 18464) [0x195940820]
328 <Non-Frontmost App, e-core>
326 <e-core>
232 <Non-Frontmost App>
472 ??? (FlutterMacOS + 9804580) [0x1065e5b24]
472 ??? (FlutterMacOS + 9803592) [0x1065e5748]
472 ??? (FlutterMacOS + 9768628) [0x1065dceb4]
472 ??? (FlutterMacOS + 9715304) [0x1065cfe68]
472 ??? (FlutterMacOS + 9707632) [0x1065ce070]
472 ??? (App + 32556) [0x11b8dff2c]
472 ??? (App + 583884) [0x11b9668cc]
472 ??? (App + 583976) [0x11b966928]
472 ??? (App + 54352) [0x11b8e5450]
472 ??? (App + 54412) [0x11b8e548c]
472 ??? (App + 54672) [0x11b8e5590]
472 ??? (App + 55092) [0x11b8e5734]
472 ??? (App + 55232) [0x11b8e57c0]
472 ??? (App + 56064) [0x11b8e5b00]
472 ??? (App + 189868) [0x11b9065ac]
472 ??? (App + 190228) [0x11b906714]
472 ??? (App + 11368232) [0x11c3af728]
472 ??? (App + 4341464) [0x11bcfbed8]
472 ??? (App + 10224068) [0x11c2981c4]
472 ??? (App + 10224344) [0x11c2982d8]
242 ??? (App + 33316) [0x11b8e0224]
242 ??? (FlutterMacOS + 9884824) [0x1065f9498]
242 ??? (FlutterMacOS + 9886076) [0x1065f997c]
242 ??? (FlutterMacOS + 9050908) [0x10652db1c]
242 ??? (FlutterMacOS + 9073656) [0x1065333f8]
242 copyfile + 3736 (libcopyfile.dylib + 6208) [0x1a5425840]
242 copyfile_internal + 1020 (libcopyfile.dylib + 8424) [0x1a54260e8]
242 write + 8 (libsystem_kernel.dylib + 18464) [0x195940820]
230 ??? (App + 33036) [0x11b8e010c]
230 ??? (FlutterMacOS + 9886076) [0x1065f997c]
230 ??? (FlutterMacOS + 9050908) [0x10652db1c]
230 ??? (FlutterMacOS + 9073656) [0x1065333f8]
230 copyfile + 3736 (libcopyfile.dylib + 6208) [0x1a5425840]
230 copyfile_internal + 1020 (libcopyfile.dylib + 8424) [0x1a54260e8]
230 write + 8 (libsystem_kernel.dylib + 18464) [0x195940820]
Binary Images:
0x1024d0000 - ??? nl.jknaapen.fladder 0.10.3 (630) <B504DF04-A8C6-3056-9CE3-DACD760A8089> /Applications/Fladder.app/Contents/MacOS/Fladder
0x105c8c000 - 0x106937fff io.flutter.flutter-macos 1.0 (1.0) <4C4C44E9-5555-3144-A1B5-B65E0EF74D86> /Applications/Fladder.app/Contents/Frameworks/FlutterMacOS.framework/Versions/A/FlutterMacOS
0x11b8d8000 - 0x11cf1bfff io.flutter.flutter.app 1.0 (1.0) <0C78D74D-A8B7-349C-9E29-7581A270FF97> /Applications/Fladder.app/Contents/Frameworks/App.framework/Versions/A/App
0x19593c000 - 0x19597849f libsystem_kernel.dylib (12377.91.3) <78EC33A6-6330-3836-8900-EB90836936E8> /usr/lib/system/libsystem_kernel.dylib
0x195979000 - 0x195985acb libsystem_pthread.dylib (539.80.3) <0596A7B6-BCE2-3F06-A2E8-3EAAB5371ED8> /usr/lib/system/libsystem_pthread.dylib
0x1a5424000 - 0x1a542e6ff libcopyfile.dylib (230.0.1.0.1) <4EBDFB06-9F51-3FEF-A4D8-B1AFB9D0E823> /usr/lib/system/libcopyfile.dylibPlatform
macOS
App Version
0.10.3
Jellyfin server
10.11.8
Description
On macOS, batch sync of multiple offline downloads always fails. Every item passes through "waiting to retry" and ends in "Failed" with no resume. Single downloads sometimes work (showing "waiting to retry" a few times but eventually complete).
After sync fails, the "Failed" state shows the progress it managed to complete (e.g. 70%), with pause and stop buttons. The pause button does nothing, and the only way to proceed is to click the stop button and restart it in the hope it completes this time.
Sync on other devices works without a problem. And jellyfin/reverse proxy shows no errors (only 200 and 206 response codes).
Fladder error logs in the app show only one error "SEVERE | Seerr server not configured".
Reproduction steps
Screenshots
No response
Logs
I have found only this diagnostic report, but not sure if it's related. There are a few like this (file backed memory dirtied over ...), but they are not generated every time.
Platform
macOS
App Version
0.10.3
Jellyfin server
10.11.8