On Tue, Jan 31, 2023 at 04:38:14AM +0000, Rishabh Bhatnagar wrote:
While running xfstests on 4.14.304 version we see a warning being generated in one of ext4 tests with the following stack trace.
WARNING: CPU: 4 PID: 15332 at mm/util.c:414 kvmalloc_node+0x67/0x70 ext4_expand_extra_isize_ea+0x2b4/0x870 [ext4] __ext4_expand_extra_isize+0xcb/0x120 [ext4] ext4_mark_inode_dirty+0x1a5/0x1d0 [ext4] ext4_ext_truncate+0x1f/0x90 [ext4] ext4_truncate+0x363/0x400 [ext4] ext4_setattr+0x392/0xa00 [ext4] notify_change+0x300/0x420 ? ext4_xattr_security_set+0x20/0x20 [ext4] do_truncate+0x75/0xc0 ? ext4_release_file+0xa0/0xa0 [ext4] path_openat+0x737/0x16f0 do_filp_open+0x9b/0x110 ? __check_object_size+0xb4/0x190 ? do_sys_open+0x1bd/0x250 do_sys_open+0x1bd/0x250 do_syscall_64+0x67/0x110 entry_SYSCALL_64_after_hwframe+0x59/0xbe
It seems rebase to 4.14.304 brings a bunch of ext4 changes. Commit ext4: allocate extended attribute value in vmalloc area (73c44f61dab180b5f2dee9f15397aba36a75a882) tries to allocate buffer using kvmalloc with improper flags that generates this warning. To fix backport an upstream commit mm: kvmalloc does not fallback to vmalloc for incompatible gfp flags (170f26afa0481c72af93aa61b7398b5663451651). This removes the WARN_ON and fallsback to kmalloc if correct flags are not passed.
Michal Hocko (1): mm: kvmalloc does not fallback to vmalloc for incompatible gfp flags
mm/util.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
-- 2.38.1
Now queued up, thanks.
greg k-h