Minor Description
When ll_rmfid() is called with 4096 FIDs (which is the max) then lmv_rmfid() will kmalloc() a 128K fid_array. Seen running sanity 421d locally:
[89441.204480] Lustre: DEBUG MARKER: == sanity test 421d: rmfid en masse ========================= ========================================= 09:24:51 (1614093891) [89445.855469] lt-lfs: page allocation failure: order:5, mode:0xc050 [89445.857280] CPU: 2 PID: 31000 Comm: lt-lfs Kdump: loaded Tainted: G W OE ------------ 3.10.0-1062.9.1.el7.x86_64.debug #1 [89445.860587] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/20 14 [89445.862335] Call Trace: [89445.862774] [<ffffffffa68704ae>] dump_stack+0x19/0x1b [89445.863489] [<ffffffffa620d86a>] warn_alloc_failed+0x11a/0x190 [89445.864314] [<ffffffffa686b1ad>] __alloc_pages_slowpath+0x708/0x776 [89445.865171] [<ffffffffa6213410>] __alloc_pages_nodemask+0x660/0x680 [89445.866104] [<ffffffffa6269b2e>] alloc_pages_current+0x10e/0x1a0 [89445.866938] [<ffffffffa6232115>] ? kmalloc_order+0x25/0x70 [89445.867705] [<ffffffffa6232115>] kmalloc_order+0x25/0x70 [89445.868413] [<ffffffffa62762f4>] kmalloc_order_trace+0x24/0x170 [89445.869234] [<ffffffffa627a279>] __kmalloc+0x409/0x430 [89445.869991] [<ffffffffc141f0c8>] ? lmv_fld_lookup+0x258/0x430 [lmv] [89445.870872] [<ffffffffc14119bb>] lmv_rmfid+0x71b/0xc20 [lmv] [89445.871661] [<ffffffffc2072e81>] ll_rmfid+0x581/0x780 [lustre] [89445.872572] [<ffffffffc2074841>] ll_dir_ioctl+0x17c1/0x61c0 [lustre] [89445.873550] [<ffffffffa62d1a94>] ? mntput+0x24/0x40 [89445.874349] [<ffffffffa62b4dc1>] ? terminate_walk+0xb1/0xc0 [89445.875228] [<ffffffffa642a45b>] ? debug_check_no_obj_freed+0xfb/0x270 [89445.876216] [<ffffffffa61409fd>] ? trace_hardirqs_on+0xd/0x10 [89445.877098] [<ffffffffa642a4d8>] ? debug_check_no_obj_freed+0x178/0x270 [89445.878880] [<ffffffffa62be880>] do_vfs_ioctl+0x410/0x6c0 [89445.880163] [<ffffffffa61787d4>] ? __audit_syscall_entry+0xb4/0x110 [89445.881656] [<ffffffffa62cc6c0>] ? fget_light+0x2b0/0x550 [89445.882968] [<ffffffffa62bebd1>] SyS_ioctl+0xa1/0xc0 [89445.884175] [<ffffffffa6887a9e>] system_call_fastpath+0x25/0x2a [89445.885552] Mem-Info:
