syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty

write to 0xffff888106627c38 of 4 bytes by task 6131 on cpu 1:
 __mark_inode_dirty+0x24e/0x7e0 fs/fs-writeback.c:2546
 generic_update_time fs/inode.c:2113 [inline]
 inode_update_time fs/inode.c:2126 [inline]
 __file_update_time fs/inode.c:2354 [inline]
 file_modified_flags+0x2ec/0x320 fs/inode.c:2425
 file_modified+0x17/0x20 fs/inode.c:2441
 ext4_write_checks fs/ext4/file.c:279 [inline]
 ext4_buffered_write_iter+0x1cc/0x370 fs/ext4/file.c:295
 ext4_file_write_iter+0x383/0xf20
 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x160/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x398/0x660 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888106627c38 of 4 bytes by task 6133 on cpu 0:
 __mark_inode_dirty+0x198/0x7e0 fs/fs-writeback.c:2537
 generic_update_time fs/inode.c:2113 [inline]
 inode_update_time fs/inode.c:2126 [inline]
 touch_atime+0x230/0x350 fs/inode.c:2198
 file_accessed include/linux/fs.h:2539 [inline]
 filemap_splice_read+0x8a5/0x910 mm/filemap.c:2979
 ext4_file_splice_read+0x8f/0xb0 fs/ext4/file.c:158
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x269/0x670 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x398/0x660 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000028

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 6133 Comm: syz.3.1069 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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