syzbot


KCSAN: data-race in _copy_to_iter / fat12_ent_put (6)

Status: auto-obsoleted due to no activity on 2024/04/04 01:15
Subsystems: exfat
[Documentation on labels]
Reported-by: syzbot+41adf9094596bdc751c0@syzkaller.appspotmail.com
First crash: 45d, last: 45d
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 582d 613d 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 322d 351d 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 142d 127d 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 (3) exfat 3 395d 411d 0/26 auto-obsoleted due to no activity on 2023/04/24 07:39
upstream KCSAN: data-race in _copy_to_iter / fat12_ent_put (2) exfat 3 511d 545d 0/26 auto-obsoleted due to no activity on 2022/12/31 00:12

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

read-write to 0xffff88813dfb8210 of 1 bytes by task 6838 on cpu 0:
 fat12_ent_put+0xcc/0x180 fs/fat/fatent.c:165
 fat_alloc_clusters+0x4b5/0xa60 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+0x25c/0x5e0 fs/fat/inode.c:190
 __block_write_begin_int+0x40b/0xf80 fs/buffer.c:2103
 __block_write_begin fs/buffer.c:2152 [inline]
 block_write_begin+0x7b/0x170 fs/buffer.c:2211
 cont_write_begin+0x479/0x690 fs/buffer.c:2565
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 generic_perform_write+0x1c9/0x410 mm/filemap.c:3930
 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4025
 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4051
 do_iter_readv_writev+0x2b0/0x330
 vfs_writev+0x2e9/0x860 fs/read_write.c:971
 do_pwritev fs/read_write.c:1072 [inline]
 __do_sys_pwritev2 fs/read_write.c:1131 [inline]
 __se_sys_pwritev2+0x10c/0x1d0 fs/read_write.c:1122
 __x64_sys_pwritev2+0x78/0x90 fs/read_write.c:1122
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88813dfb8000 of 1024 bytes by task 3372 on cpu 1:
 instrument_copy_to_user include/linux/instrumented.h:113 [inline]
 copy_to_user_iter lib/iov_iter.c:24 [inline]
 iterate_ubuf include/linux/iov_iter.h:29 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
 iterate_and_advance include/linux/iov_iter.h:271 [inline]
 _copy_to_iter+0x126/0xb20 lib/iov_iter.c:186
 copy_page_to_iter+0x171/0x2b0 lib/iov_iter.c:381
 copy_folio_to_iter include/linux/uio.h:181 [inline]
 filemap_read+0x42c/0x680 mm/filemap.c:2654
 blkdev_read_iter+0x217/0x2c0 block/fops.c:757
 call_read_iter include/linux/fs.h:2081 [inline]
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x5ab/0x6a0 fs/read_write.c:476
 ksys_read+0xeb/0x1a0 fs/read_write.c:619
 __do_sys_read fs/read_write.c:629 [inline]
 __se_sys_read fs/read_write.c:627 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:627
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3372 Comm: udevd Not tainted 6.8.0-rc6-syzkaller-00024-ge326df53af00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop1, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop4, logical block 0, async page read

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/29 01:14 upstream e326df53af00 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in _copy_to_iter / fat12_ent_put
* Struck through repros no longer work on HEAD.