linux-kernel - [syzbot] [exfat?] KCSAN: data-race in dio_bio_end_io / dio_new

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Message-ID: <000000000000c3d5e806201a97ac@google.com>
Date: Tue, 20 Aug 2024 03:07:27 -0700
From: syzbot <syzbot+fed24898593bed518bec@...kaller.appspotmail.com>
To: hirofumi@...l.parknet.co.jp, linkinjeon@...nel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	sj1557.seo@...sung.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [exfat?] KCSAN: data-race in dio_bio_end_io / dio_new_bio (3)

Hello,

syzbot found the following issue on:

HEAD commit:    6e4436539ae1 Merge tag 'hid-for-linus-2024081901' of git:/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=110c8de5980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3aa0f597417bf8c7
dashboard link: https://syzkaller.appspot.com/bug?extid=fed24898593bed518bec
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/72e87ae72e3c/disk-6e443653.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/226d5b10603c/vmlinux-6e443653.xz
kernel image: https://storage.googleapis.com/syzbot-assets/edaf634acf3f/bzImage-6e443653.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fed24898593bed518bec@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 8192
==================================================================
BUG: KCSAN: data-race in dio_bio_end_io / dio_new_bio

read-write to 0xffff888114c1e058 of 8 bytes by interrupt on cpu 1:
 dio_bio_end_io+0x53/0xd0 fs/direct-io.c:388
 bio_endio+0x369/0x410 block/bio.c:1646
 blk_update_request+0x382/0x880 block/blk-mq.c:925
 blk_mq_end_request+0x26/0x50 block/blk-mq.c:1053
 lo_complete_rq+0xce/0x180 drivers/block/loop.c:386
 blk_complete_reqs block/blk-mq.c:1128 [inline]
 blk_done_softirq+0x74/0xb0 block/blk-mq.c:1133
 handle_softirqs+0xc3/0x280 kernel/softirq.c:554
 run_ksoftirqd+0x1c/0x30 kernel/softirq.c:928
 smpboot_thread_fn+0x31c/0x4c0 kernel/smpboot.c:164
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888114c1e058 of 8 bytes by task 3990 on cpu 0:
 dio_bio_reap fs/direct-io.c:551 [inline]
 dio_new_bio+0x249/0x460 fs/direct-io.c:670
 dio_send_cur_page+0x1f2/0x7a0 fs/direct-io.c:751
 submit_page_section+0x1a3/0x5b0 fs/direct-io.c:816
 do_direct_IO fs/direct-io.c:1031 [inline]
 __blockdev_direct_IO+0x11c1/0x1e90 fs/direct-io.c:1249
 blockdev_direct_IO include/linux/fs.h:3217 [inline]
 fat_direct_IO+0x110/0x1e0 fs/fat/inode.c:282
 generic_file_direct_write+0xaf/0x200 mm/filemap.c:3941
 __generic_file_write_iter+0xae/0x120 mm/filemap.c:4107
 generic_file_write_iter+0x7d/0x1d0 mm/filemap.c:4147
 do_iter_readv_writev+0x3b0/0x470
 vfs_writev+0x2e0/0x880 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+0x271f/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:329
 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: 0xffff8881151e8e40 -> 0xffff888114d5bd80

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3990 Comm: syz.0.161 Not tainted 6.11.0-rc4-syzkaller-00008-g6e4436539ae1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================


---
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