[LU-16281] append to non-existing component triggers ASSERTION( index < lsm->lsm_entry_count ) failed

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Vitaly Fertman
• Reporter: Vitaly Fertman

Description

Appending past last defined component of a file with composite layout leads to an LASSERT() because return of lov_io_layout_at() is not checked:

stripe_width() ASSERTION( index < lsm->lsm_entry_count ) failed
BUG: unable to handle kernel paging request at ffff99d3c2f74030
        Call Trace:
          lov_stripe_number+0x19/0x40 [lov]
          lov_page_init_composite+0x103/0x5f0 [lov]
          cl_page_alloc+0x19f/0x660 [obdclass]
          cl_page_find+0x1a0/0x250 [obdclass]
          ll_write_begin+0x1f7/0xfb0 [lustre]

Issue Links

• duplicates: LU-17574 stripe_width() ASSERTION( index < lsm->lsm_entry_count ) failed