Let's find this offset in the disassembled function:
(gdb) disassemble/m
'MDSMap::decode(ceph::buffer::v15_2_0::list::iterator_impl<true>&)'
Dump of assembler code for function
_ZN6MDSMap6decodeERN4ceph6buffer7v15_2_04list13iterator_implILb1EEE:
Address range 0x7ffff7cc2e10 to 0x7ffff7cc3c4d:
837 {
0x00007ffff7cc2e10 <+0>: endbr64
0x00007ffff7cc2e14 <+4>: push %rbp
0x00007ffff7cc2e15 <+5>: mov %rsp,%rbp
...
963 if (ev >= 17) {
0x00007ffff7cc3a65 <+3157>: cmp $0x10,%r12w
0x00007ffff7cc3a6a <+3162>: je 0x7ffff7cc3371
<_ZN6MDSMap6decodeERN4ceph6buffer7v15_2_04list13iterator_implILb1EEE+1377>
964 decode(bal_rank_mask, p);
0x00007ffff7cc3a70 <+3168>: lea -0x2a4(%rbp),%rdx
0x00007ffff7cc3a77 <+3175>: mov $0x4,%esi
0x00007ffff7cc3a7c <+3180>: mov %r13,%rdi
0x00007ffff7cc3a7f <+3183>: lea 0x1c0(%rbx),%r14
965 }
966
967 if (ev >= 18) {
0x00007ffff7cc3ab1 <+3233>: cmp $0x11,%r12w
0x00007ffff7cc3ab6 <+3238>: je 0x7ffff7cc3371
<_ZN6MDSMap6decodeERN4ceph6buffer7v15_2_04list13iterator_implILb1EEE+1377>
968 decode(max_xattr_size, p);
969 }
970
971 if (ev >= 19) {
0x00007ffff7cc3ade <+3278>: cmp $0x12,%r12w
...
The return address is 0x00007ffff7cc3ab1 <+3233>, so we're looking for a
call just before that.
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https://bugs.launchpad.net/bugs/2089565
Title:
MON and MDS crash upgrading CEPH on ubuntu 24.04 LTS
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