| Message ID | CH2PR01MB5894B0182EA0B28DF2EFB916F5C72@CH2PR01MB5894.prod.exchangelabs.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v5] vmalloc: Modify the alloc_vmap_area() error message for better diagnostics | expand |
On Tue, 11 Jun 2024 19:38:44 +0000 Shubhang Kaushik OS <Shubhang@os.amperecomputing.com> wrote: > 'vmap allocation for size %lu failed: use vmalloc=<size> to increase size' > The above warning is seen in the kernel functionality for allocation of the restricted virtual memory range till exhaustion. > > This message is misleading because 'vmalloc=' is supported on arm32, x86 platforms and is not a valid kernel parameter on a number of other platforms (in particular its not supported on arm64, alpha, loongarch, arc, csky, hexagon, microblaze, mips, nios2, openrisc, parisc, m64k, powerpc, riscv, sh, um, xtensa, s390, sparc). With the update, the output gets modified to include the function parameters along with the start and end of the virtual memory range allowed. > > The warning message after fix on kernel version 6.10.0-rc1+: > > vmalloc_node_range for size 33619968 failed: Address range restricted between 0xffff800082640000 - 0xffff800084650000 > > Backtrace with the misleading error message: > > vmap allocation for size 33619968 failed: use vmalloc=<size> to increase size > insmod: vmalloc error: size 33554432, vm_struct allocation failed, mode:0xcc0(GFP_KERNEL), nodemask=(null),cpuset=/,mems_allowed=0 > CPU: 46 PID: 1977 Comm: insmod Tainted: G E 6.10.0-rc1+ #79 > Hardware name: INGRASYS Yushan Server iSystem TEMP-S000141176+10/Yushan Motherboard, BIOS 2.10.20230517 (SCP: xxx) yyyy/mm/dd > Call trace: > dump_backtrace+0xa0/0x128 > show_stack+0x20/0x38 > dump_stack_lvl+0x78/0x90 > dump_stack+0x18/0x28 > warn_alloc+0x12c/0x1b8 > __vmalloc_node_range_noprof+0x28c/0x7e0 > custom_init+0xb4/0xfff8 [test_driver] > do_one_initcall+0x60/0x290 > do_init_module+0x68/0x250 > load_module+0x236c/0x2428 > init_module_from_file+0x8c/0xd8 > __arm64_sys_finit_module+0x1b4/0x388 > invoke_syscall+0x78/0x108 > el0_svc_common.constprop.0+0x48/0xf0 > do_el0_svc+0x24/0x38 > el0_svc+0x3c/0x130 > el0t_64_sync_handler+0x100/0x130 > el0t_64_sync+0x190/0x198 When sending an updated version, please describe what was changed since the previous version. After the changelog's ^---$ separator is the usual place. I'm seeing this: --- a/mm/vmalloc.c~vmalloc-modify-the-alloc_vmap_area-error-message-for-better-diagnostics-v5 +++ a/mm/vmalloc.c @@ -2057,7 +2057,7 @@ overflow: if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) pr_warn("vmalloc_node_range for size %lu failed: Address range restricted to %#lx - %#lx\n", - size, addr, addr+size); + size, vstart, vend); kmem_cache_free(vmap_area_cachep, va); return ERR_PTR(-EBUSY);
Okay, will follow that protocol. This update is to replace the vmalloc range parameters in the overflow warning message to be between vstart and vend.
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b600df82669d..9b8f8ab90284 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -7245,9 +7245,12 @@ vmalloc=nn[KMG] [KNL,BOOT,EARLY] Forces the vmalloc area to have an exact size of <nn>. This can be used to increase - the minimum size (128MB on x86). It can also be - used to decrease the size and leave more room - for directly mapped kernel RAM. + the minimum size (128MB on x86, arm32 platforms). + It can also be used to decrease the size and leave more room + for directly mapped kernel RAM. Note that this parameter does + not exist on many other platforms (including arm64, alpha, + loongarch, arc, csky, hexagon, microblaze, mips, nios2, openrisc, + parisc, m64k, powerpc, riscv, sh, um, xtensa, s390, sparc). vmcp_cma=nn[MG] [KNL,S390,EARLY] Sets the memory size reserved for contiguous memory diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 45e1506d58c3..3827c4197522 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2055,8 +2055,8 @@ static struct vmap_area *alloc_vmap_area(unsigned long size, } if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) - pr_warn("vmap allocation for size %lu failed: use vmalloc=<size> to increase size\n", - size); + pr_warn("vmalloc_node_range for size %lu failed: Address range restricted to %#lx - %#lx\n", + size, vstart, vend); kmem_cache_free(vmap_area_cachep, va); return ERR_PTR(-EBUSY);