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KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (11)

Status: moderation: reported on 2024/06/09 03:42
Subsystems: exfat
[Documentation on labels]
Reported-by: syzbot+ff1b76e1395639202c83@syzkaller.appspotmail.com
First crash: 13d, last: 1d19h
Similar bugs (10)
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 1017d 1087d 0/27 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 676d 711d 0/27 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 1334d 1445d 0/27 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 178d 197d 0/27 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 1245d 1278d 0/27 auto-closed as invalid on 2021/02/27 21:17
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (10) exfat 1 69d 69d 0/27 auto-obsoleted due to no activity on 2024/05/18 09:53
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (9) exfat 2 108d 124d 0/27 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 783d 831d 0/27 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 1477d 1477d 0/27 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 1124d 1162d 0/27 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 0xffff888106d50468 of 8 bytes by task 21477 on cpu 0:
 mark_buffer_dirty_inode+0x18d/0x1c0 fs/buffer.c:684
 fat_mirror_bhs+0x241/0x330 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:2128
 __block_write_begin fs/buffer.c:2177 [inline]
 block_write_begin+0x7b/0x170 fs/buffer.c:2236
 cont_write_begin+0x486/0x6b0 fs/buffer.c:2590
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 cont_expand_zero fs/buffer.c:2517 [inline]
 cont_write_begin+0x186/0x6b0 fs/buffer.c:2580
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 generic_cont_expand_simple+0xaa/0x150 fs/buffer.c:2481
 fat_cont_expand+0x3a/0x160 fs/fat/file.c:223
 fat_setattr+0x2aa/0x840 fs/fat/file.c:513
 notify_change+0x814/0x8a0 fs/attr.c:497
 do_truncate fs/open.c:65 [inline]
 do_ftruncate+0x3e1/0x470 fs/open.c:181
 do_sys_ftruncate fs/open.c:199 [inline]
 __do_sys_ftruncate fs/open.c:207 [inline]
 __se_sys_ftruncate fs/open.c:205 [inline]
 __x64_sys_ftruncate+0x6a/0xc0 fs/open.c:205
 x64_sys_call+0x1f60/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:78
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888106d50468 of 8 bytes by task 21479 on cpu 1:
 mark_buffer_dirty_inode+0x96/0x1c0 fs/buffer.c:680
 fat_mirror_bhs+0x241/0x330 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:2128
 __block_write_begin fs/buffer.c:2177 [inline]
 block_write_begin+0x7b/0x170 fs/buffer.c:2236
 cont_write_begin+0x486/0x6b0 fs/buffer.c:2590
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 cont_expand_zero fs/buffer.c:2517 [inline]
 cont_write_begin+0x186/0x6b0 fs/buffer.c:2580
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 generic_cont_expand_simple+0xaa/0x150 fs/buffer.c:2481
 fat_cont_expand+0x3a/0x160 fs/fat/file.c:223
 fat_setattr+0x2aa/0x840 fs/fat/file.c:513
 notify_change+0x814/0x8a0 fs/attr.c:497
 do_truncate fs/open.c:65 [inline]
 do_ftruncate+0x3e1/0x470 fs/open.c:181
 do_sys_ftruncate fs/open.c:199 [inline]
 __do_sys_ftruncate fs/open.c:207 [inline]
 __se_sys_ftruncate fs/open.c:205 [inline]
 __x64_sys_ftruncate+0x6a/0xc0 fs/open.c:205
 x64_sys_call+0x1f60/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:78
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff888106e71a50

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21479 Comm: syz-executor.3 Tainted: G        W          6.10.0-rc4-syzkaller-00052-ge5b3efbe1ab1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/20 11:24 upstream e5b3efbe1ab1 dac2aa43 .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
2024/06/14 03:17 upstream d20f6b3d747c a9616ff5 .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
2024/06/09 03:41 upstream 061d1af7b030 82c05ab8 .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.