Hi,
i am encountering an error/crash when stacking drizzled images as ser-sequence:
- converting images to ser
- drizzle registration 1x
- average with rejection stacking → error
- error happens reliably on external usb3 ssd, but also occasionally on internal nvme ssd
- error happens with cr3 and tiff files of varying resolutions
- error happens with and without zram
- error happens most often with 20 or more images
temporary workaround:
- use fits images or fits sequence
- use ser but drop threads from 8 to 4
Information:
OS: OpenSuse Tumbleweed 20260821 KDE-Plasma 6.7.4
Siril version: 1.4.4 installed via zypper
Hardware: 16gb RAM, i5 1135G7
Ressource usage: RAM at 80-90%, swap under 50%
Hope this helps, clear skies, J.
Logs:
log: =========== SER file info ==============
log: for file ‘r_test-20-imgs.ser’
log: image size: 6024 x 4020 (16 bits)
log: sensor type: RGB
log: frame count: 20
log: instrument: Canon EOS M50
log: local time: 2026-08-22T22:33:02
log: fps: 0.008
log: Timestamps in the SER file are correctly ordered.
log: ========================================
log: Sequence loaded: r_test-20-imgs (0->19)
Purging previously saved reference frame data.
number of filtered-in images: 20
number of filtered-in images: 20
number of filtered-in images: 20
number of filtered-in images: 20
Saved the reference frame buffer for alignment preview.
number of filtered-in images: 20
number of filtered-in images: 20
log: Stacking: processing…
log: Processing all images in the sequence (20)
log: Stacking result will be stored as a 32-bit image
log: Computing normalization…
Memory per image: 369 MB. Max memory: 8228 MB
log: With the current memory and thread (8) limits, up to 8 thread(s) can be used for sequence normalization
Writing sequence file r_test-20-imgs.seq
log: Normalization computation time: 16.95 s
log: Drizzle stacking will be used.
image size: 6024x4020, 3 layers
log: Using 8251 MB memory maximum for stacking
log: We have 15 parallel blocks of size 804 (+0) for stacking.
Block 0: channel 0, from 0 to 803 (h = 804)
Block 1: channel 0, from 804 to 1607 (h = 804)
Block 2: channel 0, from 1608 to 2411 (h = 804)
Block 3: channel 0, from 2412 to 3215 (h = 804)
Block 4: channel 0, from 3216 to 4019 (h = 804)
Block 5: channel 1, from 0 to 803 (h = 804)
Block 6: channel 1, from 804 to 1607 (h = 804)
Block 7: channel 1, from 1608 to 2411 (h = 804)
Block 8: channel 1, from 2412 to 3215 (h = 804)
Block 9: channel 1, from 3216 to 4019 (h = 804)
Block 10: channel 2, from 0 to 803 (h = 804)
Block 11: channel 2, from 804 to 1607 (h = 804)
Block 12: channel 2, from 1608 to 2411 (h = 804)
Block 13: channel 2, from 2412 to 3215 (h = 804)
Block 14: channel 2, from 3216 to 4019 (h = 804)
allocating data for 8 threads (each 184 MB)
log: Starting stacking…
log: FITS error: Error reading data buffer from file:
log: FITS error: /run/media/user/Extreme SSD/astro/drizzlbug
log: FITS error: ffopen could not interpret primary array header of file:
log: FITS error: /run/media/user/Extreme SSD/astro/drizzlbug
log: FITS error: Extension doesn’t start with SIMPLE or XTENSION keyword. (ffrhdu)
log: FITS error: EXPEND = 0. / [JD] Exposure end time (standard Julian date)
log: FITS error: ffopen could not interpret primary array header of file:
log: FITS error: /run/media/user/Extreme SSD/astro/drizzlbug/drizztmp/r_test-20-imgs8.fit
log: FITS error: This does not look like a FITS file.
log: Error reading one of the drizzle weights areas (9: 0 1608 6024 804)
Error, signal 11:
Please report this bug to: Work items · FA / Siril · GitLab
siril(+0x15fb0a) [0x55b23585db0a]
/lib64/libc.so.6(+0x43190) [0x7f0465c43190]
/lib64/libc.so.6(+0x18f3dd) [0x7f0465d8f3dd]
/lib64/libc.so.6(+0x956e4) [0x7f0465c956e4]
/lib64/libc.so.6(fread+0x96) [0x7f0465c866b4]
/lib64/libcfitsio.so.10(file_read+0x46) [0x7f046843b636]
/lib64/libcfitsio.so.10(ffread+0x33) [0x7f046842f963]
/lib64/libcfitsio.so.10(ffldrc+0x1cf) [0x7f046842fb7f]
/lib64/libcfitsio.so.10(ffmbyt+0x88) [0x7f046842fed8]
/lib64/libcfitsio.so.10(ffgnky+0x98) [0x7f04684fbfd8]
/lib64/libcfitsio.so.10(ffgrec+0x8b) [0x7f04684fc18b]
/lib64/libcfitsio.so.10(+0x103136) [0x7f0468503136]
/lib64/libcfitsio.so.10(+0xc1898) [0x7f04684c1898]
/lib64/libcfitsio.so.10(+0xc15d4) [0x7f04684c15d4]
/lib64/libcfitsio.so.10(ffopen+0x1285) [0x7f0468439eb5]
/lib64/libcfitsio.so.10(ffdkopn+0x24) [0x7f046843aa74]
siril(read_drizz_fits_area+0xdc) [0x55b235919ddc]
siril(+0x33255d) [0x55b235a3055d]
/lib64/libgomp.so.1(+0x2508e) [0x7f0467b9308e]
/lib64/libc.so.6(+0x9de07) [0x7f0465c9de07]
/lib64/libc.so.6(+0x12539c) [0x7f0465d2539c]
log: FITS error: Extension doesn’t start with SIMPLE or XTENSION keyword. (ffrhdu)
log: FITS error: EXPEND = 0. / [JD] Exposure end time (standard Julian date)
log: FITS error: ffopen could not interpret primary array header of file:
log: FITS error: /run/media/user/Extreme SSD/astro/drizzlbug/drizztmp/r_test-20-imgs17.fit
log: FITS error: This does not look like a FITS file.
log: Error reading one of the drizzle weights areas (18: 0 0 6024 804)