syzbot


KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (4)
Status: auto-closed as invalid on 2021/06/28 13:09
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 399d, last: 362d
similar bugs (4):
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) 5 254d 324d 0/22 auto-closed as invalid on 2021/10/13 19:55
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (2) 11 571d 683d 0/22 auto-closed as invalid on 2020/11/30 13:39
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode (3) 2 482d 515d 0/22 auto-closed as invalid on 2021/02/27 21:17
upstream KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode 1 714d 714d 0/22 closed as invalid on 2020/06/18 14:13

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

write to 0xffff88810667c740 of 8 bytes by task 10726 on cpu 0:
 mark_buffer_dirty_inode+0x188/0x1d0 fs/buffer.c:585
 fat16_ent_put+0x4b/0x50 fs/fat/fatent.c:182
 fat_alloc_clusters+0x430/0xa50 fs/fat/fatent.c:501
 fat_add_cluster fs/fat/inode.c:108 [inline]
 __fat_get_block fs/fat/inode.c:155 [inline]
 fat_get_block+0x213/0x5a0 fs/fat/inode.c:190
 __block_write_begin_int+0x4a2/0x1060 fs/buffer.c:2031
 __block_write_begin fs/buffer.c:2081 [inline]
 block_write_begin fs/buffer.c:2141 [inline]
 cont_write_begin+0x522/0x850 fs/buffer.c:2490
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:235
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3660
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3789
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3821
 call_write_iter include/linux/fs.h:2114 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 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+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810667c740 of 8 bytes by task 10752 on cpu 1:
 mark_buffer_dirty_inode+0x92/0x1d0 fs/buffer.c:581
 fat16_ent_put+0x4b/0x50 fs/fat/fatent.c:182
 fat_ent_write+0x5e/0xd0 fs/fat/fatent.c:415
 fat_chain_add+0x149/0x400 fs/fat/misc.c:130
 fat_add_cluster fs/fat/inode.c:113 [inline]
 __fat_get_block fs/fat/inode.c:155 [inline]
 fat_get_block+0x429/0x5a0 fs/fat/inode.c:190
 __block_write_begin_int+0x4a2/0x1060 fs/buffer.c:2031
 __block_write_begin fs/buffer.c:2081 [inline]
 block_write_begin fs/buffer.c:2141 [inline]
 cont_write_begin+0x522/0x850 fs/buffer.c:2490
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:235
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3660
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3789
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3821
 call_write_iter include/linux/fs.h:2114 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 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+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10752 Comm: syz-executor.1 Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (8):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2021/05/24 13:08 upstream c4681547bcce 3c7fef33 .config log report info KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode
ci2-upstream-kcsan-gce 2021/05/04 03:07 upstream 5e321ded302d 09efdd63 .config log report info KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode
ci2-upstream-kcsan-gce 2021/05/03 23:14 upstream 6f8ee8d36d07 ad61f371 .config log report info KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode
ci2-upstream-kcsan-gce 2021/05/01 18:41 upstream 9f67672a817e 77e2b668 .config log report info KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode
ci2-upstream-kcsan-gce 2021/04/24 09:19 upstream 8db5efb83fa9 17f0b706 .config log report info KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode
ci2-upstream-kcsan-gce 2021/04/22 11:49 upstream 16fc44d6387e 33c28d03 .config log report info KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode
ci2-upstream-kcsan-gce 2021/04/19 05:53 upstream bf05bf16c76b 7e2b734b .config log report info KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode
ci2-upstream-kcsan-gce 2021/04/16 18:55 upstream 2f7b98d1e55c 7e2b734b .config log report info KCSAN: data-race in mark_buffer_dirty_inode / mark_buffer_dirty_inode