Hello Kim-Alexander Brodowski,
I just tried to get some more information from the segfault
lines, while not being involved in packaging.
It seems to point to function sieve_bytecode_version
in sieve/bc_eval.c:1809.
Unfortunately upstream seems to have removed/rewritten that
function completely [1].
I hope this is of some help to the maintainer.
A little more context in form of a backtrace may still be helpful.
That could probably be retrieved by installing a coredump
collector like systemd-coredump or corekeeper on the test system.
The first one should already print a stack trace to the journal.
If no core is collected maybe [2] could help to get one.
Kind regards,
Bernhard
(gdb) list sieve_bytecode_version
1800
1801 int sieve_bytecode_version(const sieve_bytecode_t *bc)
1802 {
1803 if (!bc) return 0;
1804
1805 int version, v_index;
1806 const bytecode_input_t *input = (bytecode_input_t *) bc->data;
1807
1808 v_index = BYTECODE_MAGIC_LEN / sizeof(bytecode_input_t);
1809 version = ntohl(input[v_index].op);
<<<<<<<<
1810
1811 /* XXX may need to convert value "1" from host byte order? */
1812 return version;
1813 }
[1]
https://github.com/cyrusimap/cyrus-imapd/commit/cf67cc90bc0f8d34d2c5f115bd872cdff041b33e#diff-f5615f080eb69ca914c3ec4e0e8389d0
[2]
https://www.cyrusimap.org/imap/reference/faqs/o-coredump.html#faqs-o-coredump
# Buster amd64 qemu VM 2019-04-15
apt update
apt dist-upgrade
apt install dpkg-dev devscripts mc gdb cyrus-common cyrus-common-dbgsym
libc6-dev
##########
gdb -q --args /usr/lib/cyrus/bin/lmtpd
set width 0
set pagination off
b main
run
generate-core-file /home/benutzer/core-example
gdb -q /usr/lib/cyrus/bin/lmtpd --core /home/benutzer/core-example
set width 0
set pagination off
directory /home/benutzer/source/cyrus-common/orig/cyrus-imapd-3.0.8
############
mkdir /home/benutzer/source/cyrus-common/orig -p
cd /home/benutzer/source/cyrus-common/orig
apt source cyrus-common
cd
##########
# From message #5:
kernel: [10870.893304] lmtpd[13473]: segfault at c ip 00007fbb6d918dd9 sp
00007ffc441f15a8 error 4 in libcyrus_sieve.so.0.0.0[7fbb6d913000+18000]
kernel: [10870.893310] Code: 24 28 e8 8a a4 ff ff 48 85 c0 49 89 c7 0f 94 c3 e9
47 ff ff ff e8 17 a8 ff ff 0f 1f 80 00 00 00 00 48 85 ff 74 0b 48 8b 47 08 <8b>
40 0c 0f c8 c3 90 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66
https://www.enodev.fr/posts/decode-segfault-errors-in-dmesg.html
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/x86/mm/fault.c?h=linux-4.9.y#n31
/*
* Page fault error code bits:
*
* bit 0 ==<-> 0: no page found<----->1: protection fault
* bit 1 ==<-> 0: read access> 1: write access
* bit 2 ==<-> 0: kernel-mode access<>1: user-mode access
* bit 3 ==<-> 1: use of reserved bit detected
* bit 4 ==<-> 1: fault was an instruction fetch
* bit 5 ==<-> 1: protection keys block access
*/
enum x86_pf_error_code {
PF_PROT> =<-----> 1 << 0,
PF_WRITE =<-----> 1 << 1,
PF_USER> =<-----> 1 << 2,
PF_RSVD> =<-----> 1 << 3,
PF_INSTR =<-----> 1 << 4,
PF_PK<-> =<-----> 1 << 5,
};
"error 4" == 0b100
bit 0 == 0: no page found
bit 1 == 0: read access
bit 2 == 1: user-mode access
##########
crash instruction - start .init == diff
0x00007fbb6d918dd9 - 0x7fbb6d913000 == 0x5DD9
(gdb) info target
Symbols from "/usr/lib/cyrus/bin/lmtpd".
Native process:
Using the running image of child Thread 0x7ffff49f3000 (LWP 1941).
While running this, GDB does not access memory from...
Local exec file:
`/usr/lib/cyrus/bin/lmtpd', file type elf64-x86-64.
Entry point: 0x55555555c0c0
0x00005555555542a8 - 0x00005555555542c4 is .interp
...
0x00007ffff7fa0238 - 0x00007ffff7fa025c is .note.gnu.build-id in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa0260 - 0x00007ffff7fa03e0 is .gnu.hash in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa03e0 - 0x00007ffff7fa13a0 is .dynsym in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa13a0 - 0x00007ffff7fa1e43 is .dynstr in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa1e44 - 0x00007ffff7fa1f94 is .gnu.version in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa1f98 - 0x00007ffff7fa1ff8 is .gnu.version_r in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa1ff8 - 0x00007ffff7fa3540 is .rela.dyn in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa3540 - 0x00007ffff7fa4398 is .rela.plt in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa5000 - 0x00007ffff7fa5017 is .init in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa5020 - 0x00007ffff7fa59c0 is .plt in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa59c0 - 0x00007ffff7fa59c8 is .plt.got in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fa59d0 - 0x00007ffff7fbc4d5 is .text in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fbc4d8 - 0x00007ffff7fbc4e1 is .fini in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fbd000 - 0x00007ffff7fc26ca is .rodata in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc26cc - 0x00007ffff7fc2ce0 is .eh_frame_hdr in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc2ce0 - 0x00007ffff7fc5034 is .eh_frame in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc6070 - 0x00007ffff7fc6078 is .init_array in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc6078 - 0x00007ffff7fc6080 is .fini_array in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc6080 - 0x00007ffff7fc6798 is .data.rel.ro in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc6798 - 0x00007ffff7fc6ac8 is .dynamic in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc6ac8 - 0x00007ffff7fc6fe8 is .got in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc7000 - 0x00007ffff7fc7030 is .data in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
0x00007ffff7fc7030 - 0x00007ffff7fc7160 is .bss in
/usr/lib/x86_64-linux-gnu/libcyrus_sieve.so.0
...
0x00007ffff4a00008 - 0x00007ffff4a00018 is .bss in
/lib/x86_64-linux-gnu/libuuid.so.1
(gdb)
current start .init + diff == current ip
0x00007ffff7fa5000 + 0x5DD9 == 0x7FFFF7FAADD9
(gdb) x/84xb 0x7FFFF7FAADD9-42
0x7ffff7faadaf <look_for_me+511>: 24 28 e8 8a a4 ff ff 48
0x7ffff7faadb7 <look_for_me+519>: 85 c0 49 89 c7 0f 94 c3
0x7ffff7faadbf <look_for_me+527>: e9 47 ff ff ff e8 17 a8
0x7ffff7faadc7 <look_for_me+535>: ff ff 0f 1f 80 00 00 00
0x7ffff7faadcf: 00 48 85 ff 74 0b 48 8b
0x7ffff7faadd7 <sieve_bytecode_version+7>: 47 08 8b 40 0c 0f c8 c3
0x7ffff7faaddf <sieve_bytecode_version+15>: 90 31 c0 c3 66 66 2e 0f
0x7ffff7faade7: 1f 84 00 00 00 00 00 66
0x7ffff7faadef: 90 41 57 41 56 41 55 41
0x7ffff7faadf7 <sieve_eval_bc+7>: 54 55 53 48 81 ec 58 11
0x7ffff7faadff <sieve_eval_bc+15>: 00 00 48 8b
# From message 5:
kernel: [10870.893310] Code: 24 28 e8 8a a4 ff ff 48 85 c0 49 89 c7 0f
94 c3 e9 47 ff ff ff e8 17 a8 ff ff 0f 1f 80 00 00 00 00 48 85 ff 74 0b 48 8b
47 08 <8b> 40 0c 0f c8 c3 90 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66
(gdb) disassemble sieve_bytecode_version
Dump of assembler code for function sieve_bytecode_version:
0x00007ffff7faadd0 <+0>: test %rdi,%rdi
0x00007ffff7faadd3 <+3>: je 0x7ffff7faade0
<sieve_bytecode_version+16>
0x00007ffff7faadd5 <+5>: mov 0x8(%rdi),%rax
0x00007ffff7faadd9 <+9>: mov 0xc(%rax),%eax
<<<<<<<<<<<<
0x00007ffff7faaddc <+12>: bswap %eax
0x00007ffff7faadde <+14>: retq
0x00007ffff7faaddf <+15>: nop
0x00007ffff7faade0 <+16>: xor %eax,%eax
0x00007ffff7faade2 <+18>: retq
End of assembler dump.
(gdb) b *0x00007ffff7faadd9
Breakpoint 1 at 0x7ffff7faadd9: file
/usr/include/x86_64-linux-gnu/bits/byteswap.h, line 52.
(gdb) list sieve_bytecode_version
1800
1801 int sieve_bytecode_version(const sieve_bytecode_t *bc)
1802 {
1803 if (!bc) return 0;
1804
1805 int version, v_index;
1806 const bytecode_input_t *input = (bytecode_input_t *) bc->data;
1807
1808 v_index = BYTECODE_MAGIC_LEN / sizeof(bytecode_input_t);
1809 version = ntohl(input[v_index].op);
1810
1811 /* XXX may need to convert value "1" from host byte order? */
1812 return version;
1813 }
sieve/bc_eval.c:1809
(gdb) disassemble /m sieve_bytecode_version
Dump of assembler code for function sieve_bytecode_version:
1802 {
1803 if (!bc) return 0;
0x00007ffff7faadd0 <+0>: test %rdi,%rdi
0x00007ffff7faadd3 <+3>: je 0x7ffff7faade0
<sieve_bytecode_version+16>
1804
1805 int version, v_index;
1806 const bytecode_input_t *input = (bytecode_input_t *) bc->data;
1807
1808 v_index = BYTECODE_MAGIC_LEN / sizeof(bytecode_input_t);
1809 version = ntohl(input[v_index].op);
1810
1811 /* XXX may need to convert value "1" from host byte order? */
1812 return version;
0x00007ffff7faadde <+14>: retq
0x00007ffff7faaddf <+15>: nop
0x00007ffff7faade0 <+16>: xor %eax,%eax
0x00007ffff7faade2 <+18>: retq
0x00007ffff7faade3: data16 nopw %cs:0x0(%rax,%rax,1)
0x00007ffff7faadee: xchg %ax,%ax
End of assembler dump.
(gdb) ptype sieve_bytecode_t
type = struct sieve_bytecode {
ino_t inode;
const char *data;
size_t len;
int fd;
int is_executing;
sieve_bytecode_t *next;
}
(gdb) ptype bytecode_input_t
type = union {
int op;
int value;
int jump;
int listlen;
int len;
int str;
}
benutzer@debian:~$ cat -n /usr/include/x86_64-linux-gnu/bits/byteswap.h | grep
-E "^ 52" -C5
47
48 static __inline __uint32_t
49 __bswap_32 (__uint32_t __bsx)
50 {
51 #if __GNUC_PREREQ (4, 3)
52 return __builtin_bswap32 (__bsx);
53 #else
54 return __bswap_constant_32 (__bsx);
55 #endif
56 }
57
