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KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (10)

Status: auto-obsoleted due to no activity on 2024/05/18 09:53
Subsystems: exfat
[Documentation on labels]
Reported-by: syzbot+babfc115ed72bb9699bd@syzkaller.appspotmail.com
First crash: 38d, last: 38d
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (5) exfat 5 986d 1056d 0/26 auto-closed as invalid on 2021/10/13 19:55
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (7) exfat 5 644d 680d 0/26 auto-closed as invalid on 2022/09/20 02:49
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (2) exfat 11 1303d 1414d 0/26 auto-closed as invalid on 2020/11/30 13:39
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (8) exfat 101 146d 166d 0/26 auto-obsoleted due to no activity on 2024/01/31 07:12
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (3) exfat 2 1214d 1246d 0/26 auto-closed as invalid on 2021/02/27 21:17
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (9) exfat 2 77d 93d 0/26 auto-obsoleted due to no activity on 2024/04/09 13:34
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (6) exfat 6 752d 800d 0/26 auto-closed as invalid on 2022/06/04 23:25
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode exfat 1 1446d 1446d 0/26 closed as invalid on 2020/06/18 14:13
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (4) exfat 8 1093d 1131d 0/26 auto-closed as invalid on 2021/06/28 13:09

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

write to 0xffff888121551670 of 8 bytes by task 20350 on cpu 0:
 mark_buffer_dirty_inode+0x18d/0x1c0 fs/buffer.c:684
 fat_mirror_bhs+0x247/0x340 fs/fat/fatent.c:398
 fat_alloc_clusters+0x994/0xa80 fs/fat/fatent.c:543
 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+0x417/0xfa0 fs/buffer.c:2105
 __block_write_begin fs/buffer.c:2154 [inline]
 block_write_begin+0x7b/0x170 fs/buffer.c:2213
 cont_write_begin+0x486/0x6b0 fs/buffer.c:2567
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 cont_expand_zero fs/buffer.c:2494 [inline]
 cont_write_begin+0x186/0x6b0 fs/buffer.c:2557
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 generic_perform_write+0x1d5/0x410 mm/filemap.c:3974
 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4069
 generic_file_write_iter+0x7d/0x1d0 mm/filemap.c:4095
 do_iter_readv_writev+0x339/0x3e0
 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
 x64_sys_call+0xf52/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:329
 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+0x77/0x7f

read to 0xffff888121551670 of 8 bytes by task 20432 on cpu 1:
 mark_buffer_dirty_inode+0x96/0x1c0 fs/buffer.c:680
 fat_mirror_bhs+0x247/0x340 fs/fat/fatent.c:398
 fat_alloc_clusters+0x994/0xa80 fs/fat/fatent.c:543
 fat_add_cluster+0x47/0xe0 fs/fat/inode.c:108
 fat_fallocate+0x129/0x1d0 fs/fat/file.c:292
 vfs_fallocate+0x380/0x3e0 fs/open.c:330
 do_vfs_ioctl+0x1481/0x1560 fs/ioctl.c:883
 __do_sys_ioctl fs/ioctl.c:902 [inline]
 __se_sys_ioctl+0x81/0x150 fs/ioctl.c:890
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:890
 x64_sys_call+0x155d/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:17
 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+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff8881052d8e30

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20432 Comm: syz-executor.2 Tainted: G        W          6.9.0-rc3-syzkaller-00344-g8f2c057754b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/13 09:53 upstream 8f2c057754b2 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode
* Struck through repros no longer work on HEAD.