[LU-17696] Kernel 6.8 client LBUG: (dcache.c:136:ll_ddelete()) ASSERTION( d_count(de) == 1 ) failed

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.6
• Affects Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Jian Yu
• Reporter: Jian Yu

Description

After applying patch series https://review.whamcloud.com/54229 on master branch, Lustre client build passed with kernel 6.8.0-060800-generic. However, after mounting the filesystem, touching a file hit the following LBUG:

LustreError: 12066:0:(dcache.c:136:ll_ddelete()) ASSERTION( d_count(de) == 1 ) failed:
LustreError: 12066:0:(dcache.c:136:ll_ddelete()) LBUG
CPU: 0 PID: 12066 Comm: lfs Tainted: G           OE      6.8.0-060800-generic #202403131158
Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
Call Trace:
 <TASK>
 dump_stack_lvl+0x48/0x70
 dump_stack+0x10/0x20
 lbug_with_loc+0x3e/0x70 [libcfs]
 ll_ddelete+0x278/0x280 [lustre]
 dput+0x174/0x1b0
 step_into+0x2f1/0x390
 walk_component+0x51/0x190
 path_lookupat+0x6a/0x1b0
 filename_lookup+0xe4/0x200
 vfs_statx+0x95/0x1d0
 do_statx+0x64/0xb0
 __x64_sys_statx+0x67/0x90
 do_syscall_64+0x85/0x180
 ? irqentry_exit+0x43/0x50
 ? exc_page_fault+0x94/0x1b0
 entry_SYSCALL_64_after_hwframe+0x6e/0x76
RIP: 0033:0x7eeaf551ac6e
Code: 31 0e 00 ba ff ff ff ff 64 c7 00 16 00 00 00 e9 a5 fd ff ff e8 d3 e2 01 00 0f 1f 00 f3 0f 1e fa 41 89 ca b8 4c 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 2a 89 c1 85 c0 74 0f 48 8b 05 75 31 0e 00 64 
RSP: 002b:00007ffdade73a08 EFLAGS: 00000202 ORIG_RAX: 000000000000014c
RAX: ffffffffffffffda RBX: 00007ffdade73b38 RCX: 00007eeaf551ac6e
RDX: 0000000000000000 RSI: 00007ffdade7a1d8 RDI: 00000000ffffff9c
RBP: 00007ffdade7a1d8 R08: 00007ffdade73a10 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffdade74b90
R13: 00007ffdade73b38 R14: 0000000000000000 R15: 0000000000000001
 </TASK>
Kernel panic - not syncing: LBUG
CPU: 0 PID: 12066 Comm: lfs Tainted: G           OE      6.8.0-060800-generic #202403131158
Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
Call Trace:
 <TASK>
 dump_stack_lvl+0x48/0x70
 dump_stack+0x10/0x20
 panic+0x35f/0x3c0
 lbug_with_loc+0x70/0x70 [libcfs]
 ll_ddelete+0x278/0x280 [lustre]
 dput+0x174/0x1b0
 step_into+0x2f1/0x390
 walk_component+0x51/0x190
 path_lookupat+0x6a/0x1b0
 filename_lookup+0xe4/0x200
 vfs_statx+0x95/0x1d0
 do_statx+0x64/0xb0
 __x64_sys_statx+0x67/0x90
 do_syscall_64+0x85/0x180
 ? irqentry_exit+0x43/0x50
 ? exc_page_fault+0x94/0x1b0
 entry_SYSCALL_64_after_hwframe+0x6e/0x76
RIP: 0033:0x7eeaf551ac6e
Code: 31 0e 00 ba ff ff ff ff 64 c7 00 16 00 00 00 e9 a5 fd ff ff e8 d3 e2 01 00 0f 1f 00 f3 0f 1e fa 41 89 ca b8 4c 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 2a 89 c1 85 c0 74 0f 48 8b 05 75 31 0e 00 64
RSP: 002b:00007ffdade73a08 EFLAGS: 00000202 ORIG_RAX: 000000000000014c
RAX: ffffffffffffffda RBX: 00007ffdade73b38 RCX: 00007eeaf551ac6e
RDX: 0000000000000000 RSI: 00007ffdade7a1d8 RDI: 00000000ffffff9c
RBP: 00007ffdade7a1d8 R08: 00007ffdade73a10 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffdade74b90
R13: 00007ffdade73b38 R14: 0000000000000000 R15: 0000000000000001
 </TASK>
Kernel Offset: 0x2a200000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
---[ end Kernel panic - not syncing: LBUG ]---

Issue Links

• is related to: LU-17592 Kernel 6.8 support