[LU-16616] crash in osc_brw_prep_request() ASSERTION( page_count == 1 || (ergo(i == 0, poff + pg->count == PAGE_SIZE) ...

• Type: Bug
• Resolution: Unresolved
• Priority: Critical
• Labels: client

Environment

Three server nodes and one client. Kernel version: Ubuntu-5.4.0-90.101

# MGS
mkfs.lustre --fsname=lustre --mgs /dev/vda
mount -t lustre /dev/vda /root/lustre-server

# MDS
mkfs.lustre --fsname=lustre --index=0 --mgsnode=$start_ip@tcp0 --mdt /dev/vda
mount -t lustre /dev/vda /root/lustre-server

# OSS
mkfs.lustre --ost --fsname=lustre --index=1 --reformat --mgsnode=$start_ip@tcp0 /dev/vda
mount -t lustre /dev/vda /root/lustre-server

# Client
mount -t lustre $start_ip@tcp0:/lustre /root/lustre-client

• Severity: 3
• Assignee: WC Triage
• Reporter: Tao Lyu

Description

An assertion in the Lustre client is triggered by the following calls, which leads to a kernel crash during executing the write syscall shown below:
 
 // Strace
open("./file1", O_RDWR|O_CREAT|O_EXCL|O_TRUNC|O_DIRECT|O_LARGEFILE|O_NOFOLLOW, 000) = 3
write(3, "#! ./file1\n}!F\270\v\21k;{\310T+z\311-\311@:\312\27S"..., 3595

Issue Links

• is related to: LU-16617 A null-pointer dereference in osc_request.c:3358:function osc_iocontro
• is related to: LU-16634 Null pointer dereference in lustre_set_wire_obdo