on 3/21/2024 12:23 AM, Guenter Roeck wrote: > Hi, > > On Wed, Jan 03, 2024 at 06:48:57PM +0800, Kemeng Shi wrote: >> Add unit test of ext4_mb_generate_buddy >> >> Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx> > > With this and other new ext4 tests test in the tree, I see a variety > of backtraces in the upstream kernel if debug options are enabled. > An example is > > [ 6.821447] KTAP version 1 > [ 6.821769] # Subtest: test_mb_generate_buddy > [ 6.824787] ============================================================================= > [ 6.825568] BUG inode_cache (Tainted: G N): Padding overwritten. 0xfffff80006223f68-0xfffff80006223f6f @offset=16232 > ... > [ 6.894341] ok 7 ext4_inode_test > [ 6.895411] ============================================================================= > [ 6.895777] BUG inode_cache (Tainted: G B N): Padding overwritten. 0xfffff80006223f68-0xfffff80006223f6f @offset=16232 > > Another example, from another test run, is > > [ 3.938551] # Subtest: test_new_blocks_simple > [ 3.947171] ok 1 block_bits=10 cluster_bits=3 blocks_per_group=8192 group_count=4 desc_size=64 > [ 3.952988] ok 2 block_bits=12 cluster_bits=3 blocks_per_group=8192 group_count=4 desc_size=64 > [ 3.958403] ok 3 block_bits=16 cluster_bits=3 blocks_per_group=8192 group_count=4 desc_size=64 > [ 3.958890] ============================================================================= > [ 3.959159] BUG inode_cache (Tainted: G N): Padding overwritten. 0xffff8de881adbf68-0xffff8de881adbf6f @offset=16232 > > Another one: > > [ 18.730473] # Subtest: test_new_blocks_simple > [ 18.760547] ok 1 block_bits=10 cluster_bits=3 blocks_per_group=8192 group_count=4 desc_size=64 > [ 18.778477] ================================================================== > [ 18.778950] BUG: KFENCE: out-of-bounds write in ext4_mb_init+0x5d7/0xa60 > > This is just a sample, taken from a quick look at test results. > > Are those backtraces expected ? If so, would it be possible to execute the > tests without generating such backtraces ? The backtraces, if intentional, > hide real problems in the noise. Thanks for the report. The backtrace is not expected, I will look into this. Thansk! > > Thanks, > Guenter >
