From: Disha Goel Date: Tue, 19 Mar 2024 11:16:13 +0000 (+0530) Subject: generic/735: improve test by incorporating extra hints X-Git-Tag: v2024.03.31~3 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=a7958a7c68207fc8cff4dea8354918882cf3cc07;p=xfstests-dev.git generic/735: improve test by incorporating extra hints On power systems with 64k block size (where default page size is 64k) we encountered a kernel oops due to an integer overflow issue when writing near the last logical block of a file. The allocator could allocate a range where the end exceeds the maximum supported logical block (UINT32_MAX), leading to a subsequent BUG_ON. This issue has been addressed in the upstream kernel with commit 2dcf5fde6dff ("ext4: prevent the normalized size from exceeding EXT_MAX_BLOCKS"). ================================================== kernel BUG at fs/ext4/mballoc.c:4448! Oops: Exception in kernel mode, sig: 5 [#1] CPU: 8 PID: 2880554 Comm: xfs_io NIP ext4_mb_use_inode_pa+0x110/0x160 [ext4] LR ext4_mb_use_inode_pa+0xac/0x160 [ext4] Call Trace: ext4_mb_new_inode_pa+0x134/0x3a0 [ext4] ext4_mb_try_best_found+0x158/0x280 [ext4] ext4_mb_regular_allocator+0x16c/0x940 [ext4] ext4_mb_new_blocks+0x610/0x960 [ext4] ext4_ext_map_blocks+0x858/0xa90 [ext4] ext4_map_blocks+0x218/0x800 [ext4] ext4_iomap_alloc+0x10c/0x260 [ext4] ext4_iomap_begin+0xfc/0x1f0 [ext4] iomap_iter+0xf0/0x190 __iomap_dio_rw+0x208/0x690 iomap_dio_rw+0x20/0x80 ext4_dio_write_iter+0x210/0x4d0 [ext4] vfs_write+0x364/0x4e0 sys_pwrite64+0xd4/0x120 system_call_exception+0x164/0x310 system_call_vectored_common+0xe8/0x278 ================================================== This test has been extended to provide a hint about the relevant fix in case of failure. Signed-off-by: Disha Goel Reviewed-by: Zorro Lang Signed-off-by: Zorro Lang --- diff --git a/tests/generic/735 b/tests/generic/735 index 75b23d5e..0ba111a6 100755 --- a/tests/generic/735 +++ b/tests/generic/735 @@ -6,16 +6,19 @@ # # Append writes to a file with logical block numbers close to 0xffffffff # and observe if a kernel crash is caused by ext4_lblk_t overflow triggering -# BUG_ON at ext4_mb_new_inode_pa(). This is a regression test for commit -# bc056e7163ac ("ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow") -# +# BUG_ON at ext4_mb_new_inode_pa(). This is a regression test for +# commit bc056e7163ac ("ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow") +# commit 2dcf5fde6dff ("ext4: prevent the normalized size from exceeding EXT_MAX_BLOCKS") + . ./common/preamble . ./common/populate _begin_fstest auto quick insert prealloc # real QA test starts here -[[ "$FSTYP" =~ ext[0-9]+ ]] && _fixed_by_kernel_commit bc056e7163ac \ - "ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow" +if [[ "$FSTYP" =~ ext[0-9]+ ]]; then + _fixed_by_kernel_commit bc056e7163ac "ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow" + _fixed_by_kernel_commit 2dcf5fde6dff "ext4: prevent the normalized size from exceeding EXT_MAX_BLOCKS" +fi _require_odirect _require_xfs_io_command "falloc"