While syncing, I get the message "Error: channel myaccount: slave inbox
cannot be opened" and messages do not sync. This is a known-good
configuration ("it worked before") that would occasionally, inexplicably
throw this error but could be fixed (now it can't be) by deleting and
recreating the local storage folders.
I am using `Patterns *` to automatically sync all mailboxes.
Doing `chmod -R ugo+rwx Maildir/myaccount/*` to eliminate potential
permissions issues does not help either.
Running mbsync with -DMm:
Opening master box inbox...
Opening slave box inbox...
Error: channel myaccount: slave inbox cannot be opened.
The error previously could be fixed by wiping the local store and letting
mbsync recreate everything from scratch. Now even this does not help.
$ rm -rf Maildir/myaccount/*
$ mbsync -a
...
Opening master box inbox...
Opening slave box inbox...
Creating slave inbox...
Maildir notice: no UIDVALIDITY, creating new.
Loading master...
master: 56 messages, 0 recent
Loading slave...
slave: 0 messages, 0 recent
Synchronizing...
...
At this point the mailboxes are all created correctly in the Maildir/
folder, but the subfolders (e.g inbox/) are empty. (There's plenty of free
disk space, that is not the problem!)
Now try again:
$ mbsync -a
Opening master box inbox...
Opening slave box inbox...
Error: channel myaccount: slave inbox cannot be opened.
Here's the relevant strace output from when the error occurs:
1957 openat(AT_FDCWD, "/home/user/Maildir/myaccount/inbox/.mbsyncstate",
O_RDONL
Y) = 4
1957 openat(AT_FDCWD,
"/home/user/Maildir/myaccount/inbox/.mbsyncstate.lock", O_
WRONLY|O_CREAT, 0666) = 5
1957 fcntl(5, F_SETLK, {l_type=F_WRLCK, l_whence=SEEK_SET, l_start=0,
l_len=0})
= 0
1957 fstat(4, {st_mode=S_IFREG|0664, st_size=88, ...}) = 0
1957 read(4, "MasterUidValidity 1552378503\nSla"..., 4096) = 88
1957 read(4, "", 4096) = 0
1957 close(4) = 0
1957 openat(AT_FDCWD,
"/home/user/Maildir/myaccount/inbox/.mbsyncstate.journal",
O_RDONLY) = -1 ENOENT (No such file or directory)
1957 write(1, "Opening master box inbox...\n", 28) = 28
1957 write(1, "Opening slave box inbox...\n", 27) = 27
1957 write(3,
"\27\3\3\0+\342u\224\17LT5\17\264\224\203j\34\304\357p}\"\320Y\37
6q\203\277\372\228"..., 48) = 48
1957 poll([{fd=3, events=POLLIN}], 1, 20000) = 1 ([{fd=3, revents=POLLIN}])
1957 read(3, "\27\3\3\0\356", 5) = 5
1957 read(3,
"Q\357z\350Q\344\310\302\251\0\343Fq\306\367\336\261\313d\317\17\3
70\374v\275\230\t\225\323!\216\251"..., 238) = 238
1957 write(3,
"\27\3\3\0.\342u\224\17LT5\20\5\346\252\263\275\274\247p\\\27\377
\253d\342T\323\f\325\270"..., 51) = 51
1957 poll([{fd=3, events=POLLIN}], 1, 20000) = 1 ([{fd=3, revents=POLLIN}])
1957 read(3, "\27\3\3\0.", 5) = 5
1957 read(3,
"Q\357z\350Q\344\310\303\262\200R\215\242Y\315p\17\275\332\266\353
\34\371\332\374j`\207f\343\243/"..., 46) = 46
1957 write(2, "Error: channel myaccount: slave i"..., 55) = 55
1957 unlink("/home/user/Maildir/myaccount/inbox/.mbsyncstate.lock") = 0
1957 close(5) = 0
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