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================================================================== BUG: KCSAN: data-race in file_write_and_wait_range / xas_clear_mark write to 0xffff88811c9ef374 of 4 bytes by task 17120 on cpu 0: xa_mark_clear lib/xarray.c:77 [inline] xas_clear_mark+0x16b/0x180 lib/xarray.c:932 __folio_start_writeback+0x2ce/0x430 mm/page-writeback.c:3113 ext4_bio_write_folio+0x590/0x9d0 fs/ext4/page-io.c:583 mpage_submit_folio fs/ext4/inode.c:1937 [inline] mpage_process_page_bufs+0x46c/0x5b0 fs/ext4/inode.c:2050 mpage_prepare_extent_to_map+0x775/0xb80 fs/ext4/inode.c:2551 ext4_do_writepages+0xa25/0x2270 fs/ext4/inode.c:2737 ext4_writepages+0x176/0x300 fs/ext4/inode.c:2829 do_writepages+0x1d2/0x480 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+0x156/0x2c0 mm/filemap.c:794 generic_buffers_fsync_noflush+0x45/0x120 fs/buffer.c:611 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x1ab/0x690 fs/ext4/fsync.c:147 vfs_fsync_range+0x10a/0x130 fs/sync.c:187 generic_write_sync include/linux/fs.h:2976 [inline] ext4_buffered_write_iter+0x34f/0x3c0 fs/ext4/file.c:305 ext4_file_write_iter+0x383/0xf00 fs/ext4/file.c:-1 iter_file_splice_write+0x5ef/0x970 fs/splice.c:738 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x153/0x2a0 fs/splice.c:1158 splice_direct_to_actor+0x30f/0x680 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1227 do_sendfile+0x380/0x640 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+0x105/0x150 fs/read_write.c:1415 x64_sys_call+0xb39/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811c9ef374 of 4 bytes by task 17117 on cpu 1: xa_marked include/linux/xarray.h:424 [inline] mapping_tagged include/linux/fs.h:540 [inline] filemap_fdatawrite_wbc mm/filemap.c:382 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] file_write_and_wait_range+0x10e/0x2c0 mm/filemap.c:794 generic_buffers_fsync_noflush+0x45/0x120 fs/buffer.c:611 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline] ext4_sync_file+0x1ab/0x690 fs/ext4/fsync.c:147 vfs_fsync_range+0x10a/0x130 fs/sync.c:187 generic_write_sync include/linux/fs.h:2976 [inline] ext4_buffered_write_iter+0x34f/0x3c0 fs/ext4/file.c:305 ext4_file_write_iter+0x383/0xf00 fs/ext4/file.c:-1 iter_file_splice_write+0x5ef/0x970 fs/splice.c:738 do_splice_from fs/splice.c:935 [inline] direct_splice_actor+0x153/0x2a0 fs/splice.c:1158 splice_direct_to_actor+0x30f/0x680 fs/splice.c:1102 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1227 do_sendfile+0x380/0x640 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+0x105/0x150 fs/read_write.c:1415 x64_sys_call+0xb39/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0e000021 -> 0x04000021 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 17117 Comm: syz.7.2780 Not tainted 6.15.0-rc5-syzkaller-00123-g2c89c1b655c0 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2025/05/08 21:46 | upstream | 2c89c1b655c0 | dbf35fa1 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in file_write_and_wait_range / xas_clear_mark | ||
2025/03/24 03:24 | upstream | 586de92313fc | 875573af | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in file_write_and_wait_range / xas_clear_mark |