loop5: detected capacity change from 0 to 256 ================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty write to 0xffff888105bc1628 of 4 bytes by task 4645 on cpu 0: __mark_inode_dirty+0x24e/0x7e0 fs/fs-writeback.c:2558 mark_buffer_dirty+0x149/0x230 fs/buffer.c:1199 block_commit_write fs/buffer.c:2189 [inline] block_write_end+0x123/0x210 fs/buffer.c:2266 generic_write_end+0x5c/0x160 fs/buffer.c:2280 fat_write_end+0x4e/0x160 fs/fat/inode.c:242 generic_perform_write+0x31e/0x4b0 mm/filemap.c:4123 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4219 generic_file_write_iter+0x92/0x310 mm/filemap.c:4245 iter_file_splice_write+0x5f2/0x980 fs/splice.c:738 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x160/0x2c0 fs/splice.c:1158 splice_direct_to_actor+0x305/0x680 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0xd9/0x150 fs/splice.c:1227 do_sendfile+0x40a/0x690 fs/read_write.c:1368 __do_sys_sendfile64 fs/read_write.c:1429 [inline] __se_sys_sendfile64 fs/read_write.c:1415 [inline] __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888105bc1628 of 4 bytes by task 4639 on cpu 1: __mark_inode_dirty+0x58/0x7e0 fs/fs-writeback.c:2509 fat_update_time+0x1e8/0x200 fs/fat/misc.c:357 inode_update_time fs/inode.c:2076 [inline] touch_atime+0x14f/0x350 fs/inode.c:2149 file_accessed include/linux/fs.h:2599 [inline] filemap_splice_read+0x8cb/0x930 mm/filemap.c:3036 do_splice_read fs/splice.c:979 [inline] splice_direct_to_actor+0x26c/0x680 fs/splice.c:1083 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0xd9/0x150 fs/splice.c:1227 do_sendfile+0x40a/0x690 fs/read_write.c:1368 __do_sys_sendfile64 fs/read_write.c:1429 [inline] __se_sys_sendfile64 fs/read_write.c:1415 [inline] __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000008 -> 0x00000038 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 4639 Comm: syz.5.454 Not tainted 6.15.0-rc2-syzkaller-00048-gc62f4b82d571 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ================================================================== ================================================================== BUG: KCSAN: data-race in __writeback_single_inode / xas_set_mark write to 0xffff888105bc1714 of 4 bytes by task 4645 on cpu 1: xa_mark_set lib/xarray.c:71 [inline] xas_set_mark+0x13d/0x150 lib/xarray.c:900 tag_pages_for_writeback+0xa7/0x2a0 mm/page-writeback.c:2393 writeback_iter+0x351/0x830 mm/page-writeback.c:2536 write_cache_pages+0x4d/0x100 mm/page-writeback.c:2612 mpage_writepages+0x77/0xf0 fs/mpage.c:663 fat_writepages+0x24/0x30 fs/fat/inode.c:199 do_writepages+0x1d8/0x480 mm/page-writeback.c:2656 filemap_fdatawrite_wbc mm/filemap.c:386 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] file_write_and_wait_range+0x16e/0x2f0 mm/filemap.c:794 __generic_file_fsync+0x46/0x140 fs/libfs.c:1525 fat_file_fsync+0x46/0x100 fs/fat/file.c:191 vfs_fsync_range+0x116/0x130 fs/sync.c:187 generic_write_sync include/linux/fs.h:2976 [inline] generic_file_write_iter+0x1cc/0x310 mm/filemap.c:4249 iter_file_splice_write+0x5f2/0x980 fs/splice.c:738 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x160/0x2c0 fs/splice.c:1158 splice_direct_to_actor+0x305/0x680 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0xd9/0x150 fs/splice.c:1227 do_sendfile+0x40a/0x690 fs/read_write.c:1368 __do_sys_sendfile64 fs/read_write.c:1429 [inline] __se_sys_sendfile64 fs/read_write.c:1415 [inline] __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888105bc1714 of 4 bytes by task 4639 on cpu 0: xa_marked include/linux/xarray.h:424 [inline] mapping_tagged include/linux/fs.h:540 [inline] __writeback_single_inode+0x210/0x850 fs/fs-writeback.c:1731 writeback_single_inode+0x16c/0x3f0 fs/fs-writeback.c:1801 sync_inode_metadata+0x60/0x90 fs/fs-writeback.c:2883 __generic_file_fsync+0xed/0x140 fs/libfs.c:1536 fat_file_fsync+0x46/0x100 fs/fat/file.c:191 vfs_fsync_range+0x116/0x130 fs/sync.c:187 generic_write_sync include/linux/fs.h:2976 [inline] generic_file_write_iter+0x1cc/0x310 mm/filemap.c:4249 iter_file_splice_write+0x5f2/0x980 fs/splice.c:738 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x160/0x2c0 fs/splice.c:1158 splice_direct_to_actor+0x305/0x680 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0xd9/0x150 fs/splice.c:1227 do_sendfile+0x40a/0x690 fs/read_write.c:1368 __do_sys_sendfile64 fs/read_write.c:1429 [inline] __se_sys_sendfile64 fs/read_write.c:1415 [inline] __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x02000021 -> 0x04000021 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 4639 Comm: syz.5.454 Not tainted 6.15.0-rc2-syzkaller-00048-gc62f4b82d571 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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