syzbot


KCSAN: data-race in __xa_set_mark / xas_find_marked

Status: moderation: reported on 2020/09/25 08:57
Labels: fs mm (incorrect?)
Reported-by: syzbot+f512479ce46e8f0a9370@syzkaller.appspotmail.com
First crash: 1080d, last: 21h28m

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __xa_set_mark / xas_find_marked

read-write to 0xffff88812d3958e8 of 8 bytes by task 18914 on cpu 1:
 instrument_read_write include/linux/instrumented.h:55 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline]
 ___test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:99 [inline]
 node_set_mark lib/xarray.c:93 [inline]
 xas_set_mark lib/xarray.c:887 [inline]
 __xa_set_mark+0xdb/0x1b0 lib/xarray.c:1906
 __folio_mark_dirty+0x3c5/0x4e0 mm/page-writeback.c:2668
 mark_buffer_dirty+0x148/0x240 fs/buffer.c:1154
 __block_commit_write+0x10a/0x1a0 fs/buffer.c:2138
 block_write_end fs/buffer.c:2217 [inline]
 generic_write_end+0x7f/0x360 fs/buffer.c:2231
 ext4_da_write_end+0x4df/0x690 fs/ext4/inode.c:3012
 generic_perform_write+0x253/0x3d0 mm/filemap.c:3934
 ext4_buffered_write_iter+0x234/0x3e0 fs/ext4/file.c:289
 ext4_file_write_iter+0xd7/0x10e0
 __kernel_write_iter+0x15c/0x380 fs/read_write.c:517
 dump_emit_page fs/coredump.c:888 [inline]
 dump_user_range+0x25d/0x490 fs/coredump.c:915
 elf_core_dump+0x1a73/0x1b90 fs/binfmt_elf.c:2142
 do_coredump+0x1029/0x1870 fs/coredump.c:764
 get_signal+0xd65/0xff0 kernel/signal.c:2862
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:310
 irqentry_exit+0x12/0x40 kernel/entry/common.c:413
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffff88812d3958e8 of 8 bytes by task 18393 on cpu 0:
 xas_find_chunk include/linux/xarray.h:1705 [inline]
 xas_find_marked+0x216/0x660 lib/xarray.c:1356
 find_get_entry+0x5d/0x290 mm/filemap.c:2007
 filemap_get_folios_tag+0x136/0x230 mm/filemap.c:2305
 mpage_prepare_extent_to_map+0x321/0xb50 fs/ext4/inode.c:2415
 ext4_do_writepages+0xa5e/0x21e0 fs/ext4/inode.c:2701
 ext4_writepages+0x15e/0x2e0 fs/ext4/inode.c:2792
 do_writepages+0x1c5/0x340 mm/page-writeback.c:2551
 __writeback_single_inode+0x91/0x860 fs/fs-writeback.c:1603
 writeback_sb_inodes+0x511/0xaa0 fs/fs-writeback.c:1894
 __writeback_inodes_wb+0x9a/0x1a0 fs/fs-writeback.c:1965
 wb_writeback+0x24d/0x6c0 fs/fs-writeback.c:2070
 wb_check_start_all fs/fs-writeback.c:2192 [inline]
 wb_do_writeback fs/fs-writeback.c:2218 [inline]
 wb_workfn+0x4ea/0x8d0 fs/fs-writeback.c:2251
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x00000001fe000000 -> 0x00000007fe000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18393 Comm: kworker/u4:1 Tainted: G        W          6.4.0-rc5-syzkaller-00016-ga4d7d7011219 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: writeback wb_workfn (flush-8:0)
==================================================================

Crashes (869):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2023/06/06 16:23 upstream a4d7d7011219 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/06/05 17:18 upstream f8dba31b0a82 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/06/04 21:41 upstream 9561de3a55be a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/06/04 09:38 upstream e5282a7d8f6b a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/06/03 06:17 upstream 4ecd704a4c51 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/06/02 00:29 upstream 1874a42a7d74 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/06/01 21:42 upstream 929ed21dfdb6 a4ae4f42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/06/01 14:50 upstream 929ed21dfdb6 babc4389 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/31 21:18 upstream 48b1320a674e babc4389 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/31 05:45 upstream afead42fdfca 09898419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/30 22:38 upstream 8b817fded42d df37c7f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/29 03:36 upstream 7877cb91f108 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/28 08:58 upstream 4e893b5aa4ac cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/26 18:48 upstream 0d85b27b0cc6 cf184559 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/26 11:58 upstream 9db898594c54 b40ef614 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/25 05:42 upstream 933174ae28ba 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/24 16:35 upstream 9d646009f65d 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/24 01:33 upstream 27e462c8fad4 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/23 21:44 upstream ae8373a5add4 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/21 19:24 upstream e2065b8c1b01 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/21 03:55 upstream 0dd2a6fb1e34 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/20 20:34 upstream d635f6cc934b 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/19 23:39 upstream cbd6ac3837cd 96689200 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/19 11:22 upstream 2d1bcbc6cd70 3bb7af1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/18 02:26 upstream 1b66c114d161 3bb7af1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/17 15:52 upstream f1fcbaa18b28 eaac4681 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/17 00:30 upstream f1fcbaa18b28 11c89444 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/15 03:58 upstream f1fcbaa18b28 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/14 21:42 upstream bb7c241fae62 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/13 03:23 upstream 9a48d6046722 ecca8a24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/11 23:48 upstream 105131df9c3b adb9a3cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/11 05:42 upstream d295b66a7b66 0fbd49f4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/11 00:10 upstream d295b66a7b66 14b12a99 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/10 06:04 upstream 16a8829130ca 1964022b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/10 02:51 upstream 1dc3731daf1f 30aa2a7e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/05 20:44 upstream 7163a2111f6c de870ca5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/03 17:13 upstream 348551ddaf31 b5918830 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/03 00:29 upstream 7df047b3f0aa 48e0a81d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/05/02 13:59 upstream 865fdb08197e 52d40fd2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/30 23:53 upstream 58390c8ce1bd 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/30 10:38 upstream 825a0714d2b3 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/29 10:24 upstream 89d77f71f493 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/28 18:18 upstream 33afd4b76393 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/28 13:11 upstream 35fab9271b7e 70a605de .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/28 02:56 upstream 35fab9271b7e 6f3d6fa7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/25 14:16 upstream 173ea743bf7a 65320f8e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/24 18:16 upstream 457391b03803 fdc18293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/24 02:41 upstream 457391b03803 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/23 08:51 upstream 622322f53c6d 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2023/04/22 20:46 upstream 2caeeb9d4a1b 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __xa_set_mark / xas_find_marked
2021/01/17 11:08 upstream 0da0a8a0a0e1 813be542 .config console log report info ci2-upstream-kcsan-gce
2020/09/24 17:40 upstream 171d4ff79f96 54289b08 .config console log report info ci2-upstream-kcsan-gce
2020/06/21 17:45 upstream 64677779e896 4f2acff9 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.