Hello Paul,
I've tried to reproduce it with mdadm 4.1 and mdadm 4.2 and both apps
exit with
segmentation fault. This patch is not a fix, it adds checking if device
is md array.
It hasn't been checked before in mdmonitor, so segmentation fault should
appear.
Regards,
Kinga
On 3/23/2022 11:31 AM, Paul Menzel wrote:
Dear Kinga,
Am 23.03.22 um 10:02 schrieb Tanska, Kinga:
I will send splitted patches in next messages.
Thank you.
There are steps to reproduce:
1. Stop mdmonitor instance e.g.
# systemctl stop mdmonitor
2. Run mdmonitor for non-md device e.g.
# mdadm --monitor /dev/nvme1n1
Call trace:
#0 0x00007ffff7617518 in __strcpy_sse2_unaligned () from
/usr/lib64/libc.so.6
#1 0x000000000042bc9e in check_array ()
#2 0x000000000042c7af in Monitor ()
#3 0x0000000000406edc in main ()
I am unable to reproduce it with mdadm 4.1:
$ sudo strace mdadm --monitor /dev/sda
execve("/usr/bin/mdadm", ["mdadm", "--monitor", "/dev/sda"],
0x7ffc8b00e880 /* 14 vars */) = 0
[…]
openat(AT_FDCWD, "/dev/sda", O_RDONLY) = 3
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(0x8, 0), ...}) = 0
readlink("/sys/dev/block/8:0", "../../devices/pci0000:00/0000:00"...,
199) = 91
close(3) = 0
pselect6(1, NULL, NULL, [], {tv_sec=1000, tv_nsec=0}, NULL) = ?
ERESTARTNOHAND (To be restarted if no handler)
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
pselect6(1, NULL, NULL, [], {tv_sec=999, tv_nsec=568020697}, NULL)
= ? ERESTARTNOHAND (To be restarted if no handler)
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
pselect6(1, NULL, NULL, [], {tv_sec=999, tv_nsec=521836826}, NULL
Did a specific commit introduce the problem? If so, it’d be great if you
added a Fixes line.
[…]
Kind regards,
Paul
