syzbot


KCSAN: data-race in filemap_fault / generic_write_end (6)

Status: auto-closed as invalid on 2022/06/28 10:53
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 231d, last: 126d
similar bugs (5):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in filemap_fault / generic_write_end (3) 2 738d 739d 0/24 auto-closed as invalid on 2020/10/24 13:06
upstream KCSAN: data-race in filemap_fault / generic_write_end (4) 3 481d 564d 0/24 auto-closed as invalid on 2021/07/08 19:40
upstream KCSAN: data-race in filemap_fault / generic_write_end (2) 1 797d 797d 0/24 auto-closed as invalid on 2020/08/26 18:57
upstream KCSAN: data-race in filemap_fault / generic_write_end 1 968d 907d 0/24 auto-closed as invalid on 2020/04/17 11:16
upstream KCSAN: data-race in filemap_fault / generic_write_end (5) 3 404d 439d 0/24 auto-closed as invalid on 2021/09/23 14:23

Sample crash report:
==================================================================
BUG: KCSAN: data-race in filemap_fault / generic_write_end

write to 0xffff88812a11b648 of 8 bytes by task 2583 on cpu 1:
 i_size_write include/linux/fs.h:878 [inline]
 generic_write_end+0x98/0x230 fs/buffer.c:2183
 ext4_da_write_end+0x446/0x510 fs/ext4/inode.c:3068
 generic_perform_write+0x26a/0x3f0 mm/filemap.c:3798
 ext4_buffered_write_iter+0x199/0x280 fs/ext4/file.c:270
 ext4_file_write_iter+0x211/0xdf0
 do_iter_readv_writev+0x27b/0x300
 do_iter_write+0x16f/0x5c0 fs/read_write.c:852
 vfs_iter_write+0x4c/0x70 fs/read_write.c:893
 iter_file_splice_write+0x44a/0x7c0 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x660 fs/splice.c:891
 do_splice_direct+0xfb/0x180 fs/splice.c:979
 do_sendfile+0x3ad/0x900 fs/read_write.c:1246
 __do_sys_sendfile64 fs/read_write.c:1311 [inline]
 __se_sys_sendfile64 fs/read_write.c:1297 [inline]
 __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1297
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff88812a11b648 of 8 bytes by task 2584 on cpu 0:
 i_size_read include/linux/fs.h:856 [inline]
 filemap_fault+0x8a/0x740 mm/filemap.c:3114
 __do_fault mm/memory.c:3915 [inline]
 do_shared_fault mm/memory.c:4295 [inline]
 do_fault+0x5df/0xb20 mm/memory.c:4373
 handle_pte_fault mm/memory.c:4627 [inline]
 __handle_mm_fault mm/memory.c:4763 [inline]
 handle_mm_fault+0x825/0xa40 mm/memory.c:4861
 do_user_addr_fault+0x4cd/0x940 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x27/0x30
 copy_user_enhanced_fast_string+0xa/0x40
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
 copyout lib/iov_iter.c:155 [inline]
 copy_page_to_iter_iovec lib/iov_iter.c:226 [inline]
 __copy_page_to_iter lib/iov_iter.c:852 [inline]
 copy_page_to_iter+0x423/0x7b0 lib/iov_iter.c:880
 copy_folio_to_iter include/linux/uio.h:153 [inline]
 filemap_read+0x10b2/0x1400 mm/filemap.c:2730
 generic_file_read_iter+0x72/0x320 mm/filemap.c:2825
 call_read_iter include/linux/fs.h:2046 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 vfs_read+0x5a5/0x6a0 fs/read_write.c:482
 ksys_read+0xe8/0x1a0 fs/read_write.c:620
 __do_sys_read fs/read_write.c:630 [inline]
 __se_sys_read fs/read_write.c:628 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:628
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x000000000005c571 -> 0x000000000005c733

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2584 Comm: syz-executor.0 Not tainted 5.18.0-syzkaller-01157-g143a6252e1b8-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (43):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/05/24 10:46 upstream 143a6252e1b8 fcfad4ff .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/22 22:25 upstream 978df3e15846 7268fa62 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/22 07:13 upstream eaea45fc0e7b 7268fa62 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/21 17:31 upstream 6c3f5bec9b40 7268fa62 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/20 15:50 upstream 3d7285a335ed bd37ad7e .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/08 16:19 upstream 30c8e80f7932 e60b1103 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/08 14:32 upstream 30c8e80f7932 e60b1103 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/07 19:40 upstream 30c8e80f7932 e60b1103 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/05 21:07 upstream 0f5d752b1395 efeff0a5 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/05 09:07 upstream a7391ad35724 b3f09415 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/04 23:04 upstream a7391ad35724 dc9e5259 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/05/02 21:50 upstream 9050ba3a61a4 2df221f6 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/30 09:19 upstream 8013d1d3d2e3 2df221f6 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/30 05:16 upstream 8013d1d3d2e3 ad6b95d8 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/29 14:36 upstream 38d741cb70b3 44a5ca63 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/26 06:03 upstream d615b5416f8a 152baedd .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/20 03:01 upstream 559089e0a93d 7d7bc738 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/19 14:59 upstream b2d229d4ddb1 33fc6ed6 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/08 20:36 upstream 1831fed55973 e22c3da3 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/06 15:50 upstream 3e732ebf7316 97582466 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/04/05 18:08 upstream ce4c854ee868 0127c10f .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/27 10:12 upstream f022814633e1 89bc8608 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/25 15:51 upstream 34af78c4e616 89bc8608 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/22 00:02 upstream eaa54b1458ca e2d91b1d .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/15 18:26 upstream 56e337f2cf13 9e8eaa75 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/10 23:17 upstream 1db333d9a51f 9e8eaa75 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/09 14:58 upstream 330f4c53d3c2 9e8eaa75 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/08 23:15 upstream 92f90cc9fe0e 9e8eaa75 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/02 17:52 upstream fb184c4af9b9 45a13a73 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/02 04:33 upstream 575115360652 45a13a73 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/03/01 06:15 upstream 719fce7539cd 45a13a73 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/28 16:07 upstream 7e57714cd0ad 45a13a73 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/21 20:18 upstream 038101e6b2cd 6e821dbf .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/21 08:55 upstream cfb92440ee71 3cd800e4 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/16 07:03 upstream c5d9ae265b10 8b9ca619 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/13 18:37 upstream 42964a18f81c 8b9ca619 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/12 10:48 upstream 83e396641110 8b9ca619 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/11 23:03 upstream 1d41d2e82623 8b9ca619 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/11 18:16 upstream f1baf68e1383 8b9ca619 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/11 04:01 upstream f1baf68e1383 0b33604d .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/10 14:36 upstream e3c85076d7a6 0b33604d .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/09 04:38 upstream e6251ab4551f 0b33604d .config log report info KCSAN: data-race in filemap_fault / generic_write_end
ci2-upstream-kcsan-gce 2022/02/08 11:02 upstream 555f3d7be91a a7dab638 .config log report info KCSAN: data-race in filemap_fault / generic_write_end
* Struck through repros no longer work on HEAD.