================================================================== BUG: KCSAN: data-race in wbc_detach_inode / wbc_detach_inode write to 0xffff888125ed74e8 of 4 bytes by task 25391 on cpu 0: wbc_detach_inode+0x24e/0x550 fs/fs-writeback.c:701 __filemap_fdatawrite_range+0x1d4/0x230 mm/filemap.c:421 filemap_write_and_wait_range mm/filemap.c:680 [inline] filemap_write_and_wait_range+0xb1/0x150 mm/filemap.c:674 ext4_direct_IO_read fs/ext4/inode.c:3831 [inline] ext4_direct_IO+0x2d4/0xf70 fs/ext4/inode.c:3869 generic_file_read_iter+0x1b0/0x1440 mm/filemap.c:2302 ext4_file_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0xfa/0x240 fs/ext4/file.c:65 call_read_iter include/linux/fs.h:1889 [inline] generic_file_splice_read+0x35c/0x500 fs/splice.c:307 do_splice_to+0xf2/0x130 fs/splice.c:877 splice_direct_to_actor+0x1a1/0x510 fs/splice.c:954 do_splice_direct+0x161/0x1e0 fs/splice.c:1063 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff888125ed74e8 of 4 bytes by task 25392 on cpu 1: wbc_detach_inode+0x24e/0x550 fs/fs-writeback.c:701 __filemap_fdatawrite_range+0x1d4/0x230 mm/filemap.c:421 filemap_write_and_wait_range mm/filemap.c:680 [inline] filemap_write_and_wait_range+0xb1/0x150 mm/filemap.c:674 ext4_direct_IO_read fs/ext4/inode.c:3831 [inline] ext4_direct_IO+0x2d4/0xf70 fs/ext4/inode.c:3869 generic_file_read_iter+0x1b0/0x1440 mm/filemap.c:2302 ext4_file_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0xfa/0x240 fs/ext4/file.c:65 call_read_iter include/linux/fs.h:1889 [inline] generic_file_splice_read+0x35c/0x500 fs/splice.c:307 do_splice_to+0xf2/0x130 fs/splice.c:877 splice_direct_to_actor+0x1a1/0x510 fs/splice.c:954 do_splice_direct+0x161/0x1e0 fs/splice.c:1063 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 25392 Comm: syz-executor.2 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================