LKFT started testing KCSAN enabled kernel from the linux next tree.
Here we have found BUG: KCSAN: data-race in dec_zone_page_state /
write_cache_pages
This report is from an x86_64 machine clang-11 linux next 20201201.
Since we are running for the first time we do not call this regression.
[ 45.484972] BUG: KCSAN: data-race in dec_zone_page_state / write_cache_pages
[ 45.492030]
[ 45.493532] read-write (marked) to 0xffffd4e284455380 of 8 bytes by
task 269 on cpu 0:
[ 45.501453] write_cache_pages+0x270/0x6a0
[ 45.505560] generic_writepages+0x63/0xa0
[ 45.509582] blkdev_writepages+0xe/0x10
[ 45.513429] do_writepages+0x79/0x140
[ 45.517096] __writeback_single_inode+0x6d/0x390
[ 45.521714] writeback_sb_inodes+0x4fd/0xbe0
[ 45.525986] wb_writeback+0x42e/0x690
[ 45.529652] wb_do_writeback+0x4d2/0x530
[ 45.533578] wb_workfn+0xc8/0x4a0
[ 45.536897] process_one_work+0x4a6/0x830
[ 45.540908] worker_thread+0x5f7/0xaa0
[ 45.544661] kthread+0x20b/0x220
[ 45.547893] ret_from_fork+0x22/0x30
[ 45.551471]
[ 45.552963] read to 0xffffd4e284455380 of 8 bytes by task 499 on cpu 2:
[ 45.559576] dec_zone_page_state+0x1d/0x140
[ 45.563764] clear_page_dirty_for_io+0x2ab/0x3a0
[ 45.568382] write_cache_pages+0x388/0x6a0
[ 45.572480] generic_writepages+0x63/0xa0
[ 45.576495] blkdev_writepages+0xe/0x10
[ 45.580334] do_writepages+0x79/0x140
[ 45.584000] __filemap_fdatawrite_range+0x155/0x190
[ 45.588880] file_write_and_wait_range+0x51/0xa0
[ 45.593498] blkdev_fsync+0x45/0x70
[ 45.596991] __x64_sys_fsync+0xda/0x120
[ 45.600830] do_syscall_64+0x3b/0x50
[ 45.604409] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 45.609460]
[ 45.610950] Reported by Kernel Concurrency Sanitizer on:
[ 45.616259] CPU: 2 PID: 499 Comm: mkfs.ext4 Not tainted
5.10.0-rc6-next-20201201 #2
[ 45.623908] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
metadata:
git_repo: https://gitlab.com/aroxell/lkft-linux-next
target_arch: x86
toolchain: clang-11
git_describe: next-20201201
download_url: https://builds.tuxbuild.com/1l8eiWgGMi6W4aDobjAAlOleFVl/
Full test log link,
https://lkft.validation.linaro.org/scheduler/job/2002643#L1866
--
Linaro LKFT
https://lkft.linaro.org