Sometimes Mailspring freezes.
I just did a dmesg command to inspect if something went wrong.
Especially these lines might indicate an issue with the Mailspring software:
[101609.221476] metadata[11531]: segfault at 140 ip 0000000000f52436 sp 00007bc8e61fb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 0 (core 0, socket 0)
[101609.221504] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101609.229291] metadata[11515]: segfault at 140 ip 0000000000f52436 sp 00007ce8dfffe5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 14 (core 26, socket 0)
[101609.229314] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101610.942280] metadata[11548]: segfault at 140 ip 0000000000f52436 sp 00007667347fb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 5 (core 8, socket 0)
[101610.942317] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101611.585684] metadata[11504]: segfault at 140 ip 0000000000f52436 sp 00007e5097bfb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 15 (core 27, socket 0)
[101611.585732] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101612.542059] metadata[11536]: segfault at 140 ip 0000000000f52436 sp 0000707f971fb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 17 (core 29, socket 0)
[101612.542095] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101613.019413] metadata[11553]: segfault at 140 ip 0000000000f52436 sp 00007245b73fb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 16 (core 28, socket 0)
[101613.019484] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101615.420695] metadata[11540]: segfault at 140 ip 0000000000f52436 sp 00007bfc655fb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 11 (core 20, socket 0)
[101615.420734] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101617.193185] metadata[11545]: segfault at 140 ip 0000000000f52436 sp 00007ce073ffe5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 1 (core 0, socket 0)
[101617.193216] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101617.379272] metadata[11563]: segfault at 140 ip 0000000000f52436 sp 00007f14f3bfb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 3 (core 4, socket 0)
[101617.379307] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101617.456562] metadata[11522]: segfault at 140 ip 0000000000f52436 sp 000079e7ad3fb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 0 (core 0, socket 0)
[101617.456608] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00
[101617.614250] metadata[11532]: segfault at 140 ip 0000000000f52436 sp 0000792f131fb5c0 error 4 in mailsync.bin[400000+2972000] likely on CPU 12 (core 24, socket 0)
[101617.614321] Code: 99 c1 ea 1c 01 d0 83 e0 0f 29 d0 41 89 85 44 02 00 00 e9 51 ff ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 53 e8 4a fa ff ff <f6> 80 40 01 00 00 01 48 89 c3 c7 00 00 00 00 00 48 c7 40 40 00 00