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KCSAN: data-race in _copy_to_iter / fat12_ent_put (2)

Status: auto-obsoleted due to no activity on 2022/12/31 00:12
Subsystems: exfat
[Documentation on labels]
First crash: 592d, last: 558d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in _copy_to_iter / fat12_ent_put exfat 6 628d 659d 0/26 auto-obsoleted due to no activity on 2022/10/14 22:33
upstream KCSAN: data-race in _copy_to_iter / fat12_ent_put (4) exfat 5 368d 398d 0/26 auto-obsoleted due to no activity on 2023/07/02 02:14
upstream KCSAN: data-race in _copy_to_iter / fat12_ent_put (5) exfat 21 188d 173d 0/26 auto-obsoleted due to no activity on 2023/12/28 22:56
upstream KCSAN: data-race in _copy_to_iter / fat12_ent_put (6) exfat 1 91d 91d 0/26 auto-obsoleted due to no activity on 2024/04/04 01:15
upstream KCSAN: data-race in _copy_to_iter / fat12_ent_put (3) exfat 3 442d 458d 0/26 auto-obsoleted due to no activity on 2023/04/24 07:39

Sample crash report:
==================================================================
BUG: KCSAN: data-race in _copy_to_iter / fat12_ent_put

write to 0xffff88812b7c924e of 1 bytes by task 21039 on cpu 0:
 fat12_ent_put+0x76/0x180 fs/fat/fatent.c:168
 fat_alloc_clusters+0x47d/0xa80 fs/fat/fatent.c:503
 fat_add_cluster fs/fat/inode.c:108 [inline]
 __fat_get_block fs/fat/inode.c:155 [inline]
 fat_get_block+0x263/0x600 fs/fat/inode.c:190
 __block_write_begin_int+0x33d/0xc50 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x73/0x170 fs/buffer.c:2102
 cont_write_begin+0x3f1/0x520 fs/buffer.c:2456
 fat_write_begin+0x5d/0xe0 fs/fat/inode.c:235
 generic_perform_write+0x1d4/0x3f0 mm/filemap.c:3753
 __generic_file_write_iter+0x172/0x280 mm/filemap.c:3849
 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3913
 call_write_iter include/linux/fs.h:2191 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:584
 ksys_write+0xe8/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:646
 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+0x63/0xcd

read to 0xffff88812b7c9000 of 1024 bytes by task 7007 on cpu 1:
 instrument_copy_to_user include/linux/instrumented.h:120 [inline]
 copyout lib/iov_iter.c:169 [inline]
 _copy_to_iter+0x116/0x8e0 lib/iov_iter.c:527
 copy_page_to_iter+0x333/0x3f0 lib/iov_iter.c:725
 copy_folio_to_iter include/linux/uio.h:169 [inline]
 filemap_read+0x11db/0x1510 mm/filemap.c:2726
 blkdev_read_iter+0x2c6/0x370 block/fops.c:598
 call_read_iter include/linux/fs.h:2185 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x3a5/0x560 fs/read_write.c:470
 ksys_read+0xe8/0x1a0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:621
 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+0x63/0xcd

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7007 Comm: udevd Not tainted 6.1.0-rc5-syzkaller-00241-gab290eaddc4c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/11/19 07:12 upstream ab290eaddc4c 5bb70014 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in _copy_to_iter / fat12_ent_put
2022/10/23 02:51 upstream 4da34b7d175d c0b80a55 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in _copy_to_iter / fat12_ent_put
2022/10/16 10:01 upstream 1501278bb7ba 67cb024c .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in _copy_to_iter / fat12_ent_put
* Struck through repros no longer work on HEAD.