On 2025/7/5 15:10, Zhang Yi wrote: > On 2025/7/3 18:47, Joseph Qi wrote: >> >> >> On 2025/7/3 15:26, Naresh Kamboju wrote: >>> On Thu, 26 Jun 2025 at 19:23, Zhang Yi <yi.zhang@xxxxxxxxxxxxxxx> wrote: >>>> >>>> Hi, Naresh! >>>> >>>> On 2025/6/26 20:31, Naresh Kamboju wrote: >>>>> Regressions noticed on arm64 devices while running LTP syscalls mmap16 >>>>> test case on the Linux next-20250616..next-20250626 with the extra build >>>>> config fragment CONFIG_ARM64_64K_PAGES=y the kernel warning noticed. >>>>> >>>>> Not reproducible with 4K page size. >>>>> >>>>> Test environments: >>>>> - Dragonboard-410c >>>>> - Juno-r2 >>>>> - rk3399-rock-pi-4b >>>>> - qemu-arm64 >>>>> >>>>> Regression Analysis: >>>>> - New regression? Yes >>>>> - Reproducibility? Yes >>>>> >>>>> Test regression: next-20250626 LTP mmap16 WARNING fs jbd2 >>>>> transaction.c start_this_handle >>>>> >>>>> Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> >>>> >>>> Thank you for the report. The block size for this test is 1 KB, so I >>>> suspect this is the issue with insufficient journal credits that we >>>> are going to resolve. >>> >>> I have applied your patch set [1] and tested and the reported >>> regressions did not fix. >>> Am I missing anything ? >>> >>> [1] https://lore.kernel.org/linux-ext4/20250611111625.1668035-1-yi.zhang@xxxxxxxxxxxxxxx/ >>> >> >> I can also reproduce the similar warning with xfstests generic/730 under >> 64k page size + 4k block size. >> > > Hi, Joseph! > > I cannot reproduce this issue on my machine. Theoretically, the 'rsv_credits' > should be 113 under 64k page size + 4k block size, I don't think it would > exceed the max user trans buffers. Could you please give more details? > What is the configuration of your xfstests? and what does the specific error > log look like? > I'm testing on arm 64K ECS with xfstests local.config as follows: export TEST_DEV=/dev/nvme1n1p1 export TEST_DIR=/mnt/test export SCRATCH_DEV=/dev/nvme1n1p2 export SCRATCH_MNT=/mnt/scratch Each disk part is 250G and formated with 4k block size. The dmesg shows the following warning: [ 137.174661] JBD2: kworker/u32:0 wants too many credits credits:32 rsv_credits:1577 max:2695 ... [ 137.175544] Call trace: [ 137.175545] start_this_handle+0x3bc/0x3d8 (P) [ 137.175548] jbd2__journal_start+0x10c/0x248 [ 137.175550] __ext4_journal_start_sb+0xe4/0x1b0 [ 137.175553] ext4_do_writepages+0x430/0x768 [ 137.175556] ext4_writepages+0x8c/0x118 [ 137.175558] do_writepages+0xac/0x180 [ 137.175561] __writeback_single_inode+0x48/0x328 [ 137.175563] writeback_sb_inodes+0x244/0x4a0 [ 137.175564] wb_writeback+0xec/0x3a0 [ 137.175566] wb_do_writeback+0xc0/0x250 [ 137.175568] wb_workfn+0x70/0x1b0 [ 137.175570] process_one_work+0x180/0x400 [ 137.175573] worker_thread+0x254/0x2c8 [ 137.175575] kthread+0x124/0x130 [ 137.175577] ret_from_fork+0x10/0x20 ...
