> The table for Unicode upcase conversion requires an order-5 allocation, > which may fail on a highly-fragmented system: > > pool-udisksd: page allocation failure: order:5, > mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), > nodemask=(null),cpuset=/,mems_allowed=0 > CPU: 4 PID: 3756880 Comm: pool-udisksd Tainted: G U 5.8.10- > 200.fc32.x86_64 #1 > Hardware name: Dell Inc. XPS 13 9360/0PVG6D, BIOS 2.13.0 11/14/2019 Call > Trace: > dump_stack+0x6b/0x88 > warn_alloc.cold+0x75/0xd9 > ? _cond_resched+0x16/0x40 > ? __alloc_pages_direct_compact+0x144/0x150 > __alloc_pages_slowpath.constprop.0+0xcfa/0xd30 > ? __schedule+0x28a/0x840 > ? __wait_on_bit_lock+0x92/0xa0 > __alloc_pages_nodemask+0x2df/0x320 > kmalloc_order+0x1b/0x80 > kmalloc_order_trace+0x1d/0xa0 > exfat_create_upcase_table+0x115/0x390 [exfat] > exfat_fill_super+0x3ef/0x7f0 [exfat] > ? sget_fc+0x1d0/0x240 > ? exfat_init_fs_context+0x120/0x120 [exfat] > get_tree_bdev+0x15c/0x250 > vfs_get_tree+0x25/0xb0 > do_mount+0x7c3/0xaf0 > ? copy_mount_options+0xab/0x180 > __x64_sys_mount+0x8e/0xd0 > do_syscall_64+0x4d/0x90 > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > Make the driver use vmalloc() to eliminate the issue. I have not yet received a report of the same issue. But I agree that this problem is likely to occur even if it is low probability. I think it would be more appropriate to use kvcalloc and kvfree instead. Could you send me v2 patch?
