================================================================== BUG: KCSAN: data-race in start_this_handle / start_this_handle write to 0xffff888106298870 of 8 bytes by task 10044 on cpu 0: jbd2_get_transaction fs/jbd2/transaction.c:125 [inline] start_this_handle+0xceb/0x1010 fs/jbd2/transaction.c:400 jbd2__journal_start+0x1fc/0x3f0 fs/jbd2/transaction.c:503 __ext4_journal_start_sb+0x154/0x310 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:320 [inline] ext4_dirty_inode+0x78/0xc0 fs/ext4/inode.c:5951 __mark_inode_dirty+0x72/0x6b0 fs/fs-writeback.c:2262 generic_update_time fs/inode.c:1763 [inline] update_time fs/inode.c:1776 [inline] touch_atime+0x1b1/0x2d0 fs/inode.c:1847 file_accessed include/linux/fs.h:2218 [inline] generic_file_buffered_read+0x945/0x9c0 mm/filemap.c:2556 generic_file_read_iter+0x82/0x3e0 mm/filemap.c:2637 ext4_file_read_iter+0x2e0/0x430 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888106298870 of 8 bytes by task 10058 on cpu 1: start_this_handle+0x1c1/0x1010 fs/jbd2/transaction.c:352 jbd2__journal_start+0x1fc/0x3f0 fs/jbd2/transaction.c:503 __ext4_journal_start_sb+0x154/0x310 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:320 [inline] ext4_dirty_inode+0x78/0xc0 fs/ext4/inode.c:5951 __mark_inode_dirty+0x72/0x6b0 fs/fs-writeback.c:2262 generic_update_time fs/inode.c:1763 [inline] update_time fs/inode.c:1776 [inline] touch_atime+0x1b1/0x2d0 fs/inode.c:1847 file_accessed include/linux/fs.h:2218 [inline] generic_file_buffered_read+0x945/0x9c0 mm/filemap.c:2556 generic_file_read_iter+0x82/0x3e0 mm/filemap.c:2637 ext4_file_read_iter+0x2e0/0x430 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10058 Comm: syz-executor.0 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================