I'm running dovecot 2.3.19.1 on debian stable. I just started seeing a slew of these in my log:
Mar 14 10:02:38 strange.networkguild.org dovecot[865654]: imap (mgrant)<1939553><DcMIWJ8T6s7ZIx04>: Panic: file istream-header-filter.c: line 663 (i_stream_header_filter_snapshot_free): assertion failed: (snapshot- >mstream->snapshot_pending) Mar 14 10:02:38 strange.networkguild.org dovecot[865654]: imap (mgrant)<1939553><DcMIWJ8T6s7ZIx04>: Error: Raw backtrace: #0 test_subprocess_fork[0x7f1a33d7ca20] -> #1 backtrace_append[0x7f1a33d7cc90] - > #2 backtrace_get[0x7f1a33d7ce20] -> #3 execvp_const[0x7f1a33d89f90] -> #4 i_syslog_fatal_handler[0x7f1a33d8a900] -> #5 i_panic[0x7f1a33ce00a4] -> #6 fs_wrapper_unlock[0x7f1a33cdb71d] -> #7 i_stream_snapshot_free[0x7f1a33d96110] -> #8 i_stream_unref[0x7f1a33d96180] -> #9 index_mail_get_virtual_size [0x7f1a33f2d190] -> #10 index_mail_save_finish[0x7f1a33f2d470] -> #11 index_mail_get_special[0x7f1a33f2d690] -> #12 mail_get_special[0x7f1a33eaf950] -> #13 cmd_select[0x560714f983e0] -> #14 imap_fetch_begin[0x560714f9d170] - > #15 imap_fetch_more[0x560714f9d550] -> #16 cmd_fetch[0x560714f91c00] -> #17 command_exec[0x560714f9a880] -> #18 cmd_x_cancel[0x560714fa0510] -> #19 cmd_x_cancel[0x560714fa0510] -> #20 cmd_x_cancel[0x560714fa0510] -> #21 client_handle_input[0x560714fa0880] -> #22 client_input[0x560714fa0d80] -> #23 io_loop_call_io[0x7f1a33da1c70] -> #24 io_loop_handler_run_internal [0x7f1a33da3970] -> #25 io_loop_handler_run[0x7f1a33da3b00] -> #26 io_loop_run [0x7f1a33da3cd0] -> #27 master_service_run[0x7f1a33d14180] -> #28 main [0x560714f8ca00] -> #29 __libc_init_first[0x7f1a33ac51d0] -> #30 __libc_start_main[0x7f1a33ac5280] -> #31 _start[0x560714f8d000] I realize this is a slightly old version of dovecot but this is what's in debian's stable package repository. I see 2.3.21+dfsg1-2 in testing and 2.3.21+dfsg1-3 in unstable. I really try to avoid installing this on production. I didn't recently change anything in my configs on the server. I did start recently using 'eM Client' on Windows a couple days ago, could that have caused this? Mail seems to continue to come in to my imap clients, but these errors in the log are worrying! Michael Grant
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