kernel address conversion with adddr2line

[Anjali05]

Hi, I am trying to get the exact place a kernel lock was acquired using a modified version of klockstat. I am using the address I get from the stack with the function name to search the lock acquisition. Below is the example of one of the trace for pipe->mutex

Functions	addresses	file	Lock
mutex_lock_nested+0x5 [kernel],	"0xffffffff81cc9805",	mutex_lock_nested at /root/linux/kbuild/../kernel/locking/mutex.c:799	pipe->mutex
pipe_read+0x2d3 [kernel],	"0xffffffff81391d93",	pipe_occupancy at /root/linux/kbuild/../include/linux/pipe_fs_i.h:144
vfs_read+0x2bb [kernel],	"0xffffffff8138706b",	call_read_iter at /root/linux/kbuild/../include/linux/fs.h:2193
ksys_read+0xb7 [kernel],	"0xffffffff813879a7",	ksys_read at /root/linux/kbuild/../fs/read_write.c:613
do_syscall_64+0x38 [kernel],	"0xffffffff81cb7148",	do_syscall_x64 at /root/linux/kbuild/../arch/x86/entry/common.c:50
entry_SYSCALL_64_after_hwframe+0x63 [kernel],	"0xffffffff81e0009b"	entry_SYSCALL_64_after_hwframe at /root/linux/kbuild/../arch/x86/entry/entry_64.S:120

I am using addr2line to convert to source code. My goal is to use both file name with line number and function to get the line of acquisition for different locks (as a func can have multiple signature, I need both file and func name to resolve this). While for some traces the function name the the func name I get using addr2line matches for some like the example above, it does not match. For example, for pipe_read when I convert 0xffffffff81391d93 it points to something completely different. I have tried getting the address for pipe_read and adding the offset for sanity check, the address seems fine but I am not sure why would it point to pipe_occupancy. Among the cases that this is happening, there is case when function pointers are involved. In this example, pipe_read is accessed via a function pointer. I understand that function pointers are resolved at runtime. I am wondering if anyone can help me understand why there is a mismatch between func name and what I get with addr2line for such cases. Thanks in advance!