Hi,
I've tried the current barebox v2020.08.0 on my imx7d module and it crashes
while executing the command:
imx7d: / cp /mnt/boot/kernel.img /dev/mmc1.fw_update
unable to handle NULL pointer dereference at address 0x00000000
pc : [<ffe6c2dc>] lr : [<ffe6c2c0>]
sp : fffefcd0 ip : fffefcd0 fp : c00f8850
r10: ffe981ef r9 : 00000000 r8 : ffe981ef
r7 : ffe98dcb r6 : ffea60a8 r5 : ffe98dbd r4 : c00ef1e8
r3 : 00000000 r2 : bfefb8e0 r1 : ffe98dbd r0 : 00028888
Flags: nZCv IRQs off FIQs off Mode SVC_32
no stack data available
I could track the problem down to a call to list_del(&inode->i_sb_list); in
fs/fs.c:iput(struct inode *inode):
void iput(struct inode *inode)
{
if (!inode)
return;
inode->i_count--;
if (!inode->i_count) {
list_del(&inode->i_sb_list); <== this call segfaults
destroy_inode(inode);
}
}
I've checked that the struct list_head inode->i_sb_list has its .prev pointer NULL
and that's the immediate reason why I get a segfault (at WRITE_ONCE(prev->next, next)
in __list_del(prev, next); what I don't know is whether a NULL .prev is OK and the error
is a missing test in __list_del() or if a NULL .prev is already wrong.
giorgio
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