linux-kernel - [syzbot] [reiserfs?] KASAN: null-ptr-deref Read in __wait_on

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Message-ID: <00000000000088e26d05f948c634@google.com>
Date:   Fri, 14 Apr 2023 02:50:47 -0700
From:   syzbot <syzbot+f91110fac7f22eb6284f@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        reiserfs-devel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [reiserfs?] KASAN: null-ptr-deref Read in __wait_on_buffer

Hello,

syzbot found the following issue on:

HEAD commit:    09a9639e56c0 Linux 6.3-rc6
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12ad32adc80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c21559e740385326
dashboard link: https://syzkaller.appspot.com/bug?extid=f91110fac7f22eb6284f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/723a785e56e6/disk-09a9639e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/140da8057460/vmlinux-09a9639e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d73b2f2c297c/bzImage-09a9639e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f91110fac7f22eb6284f@...kaller.appspotmail.com

==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:72 [inline]
BUG: KASAN: null-ptr-deref in _test_bit_acquire include/asm-generic/bitops/instrumented-non-atomic.h:153 [inline]
BUG: KASAN: null-ptr-deref in wait_on_bit_io include/linux/wait_bit.h:99 [inline]
BUG: KASAN: null-ptr-deref in __wait_on_buffer+0x31/0x70 fs/buffer.c:123
Read of size 8 at addr 0000000000000000 by task syz-executor.2/5538

CPU: 1 PID: 5538 Comm: syz-executor.2 Not tainted 6.3.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_report mm/kasan/report.c:433 [inline]
 kasan_report+0xec/0x130 mm/kasan/report.c:536
 check_region_inline mm/kasan/generic.c:181 [inline]
 kasan_check_range+0x141/0x190 mm/kasan/generic.c:187
 instrument_atomic_read include/linux/instrumented.h:72 [inline]
 _test_bit_acquire include/asm-generic/bitops/instrumented-non-atomic.h:153 [inline]
 wait_on_bit_io include/linux/wait_bit.h:99 [inline]
 __wait_on_buffer+0x31/0x70 fs/buffer.c:123
 flush_commit_list.isra.0+0xdd6/0x1e70 fs/reiserfs/journal.c:1072
 do_journal_end+0x3714/0x4af0 fs/reiserfs/journal.c:4302
 do_journal_release fs/reiserfs/journal.c:1917 [inline]
 journal_release+0x149/0x630 fs/reiserfs/journal.c:1971
 reiserfs_put_super+0xe4/0x5c0 fs/reiserfs/super.c:616
 generic_shutdown_super+0x158/0x480 fs/super.c:500
 kill_block_super+0x9b/0xf0 fs/super.c:1407
 deactivate_locked_super+0x98/0x160 fs/super.c:331
 deactivate_super+0xb1/0xd0 fs/super.c:362
 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1177
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xad3/0x2960 kernel/exit.c:869
 __do_sys_exit kernel/exit.c:986 [inline]
 __se_sys_exit kernel/exit.c:984 [inline]
 __x64_sys_exit+0x42/0x50 kernel/exit.c:984
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fee0e88c169
Code: Unable to access opcode bytes at 0x7fee0e88c13f.
RSP: 002b:00007fee0f592118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007fee0e9abf80 RCX: 00007fee0e88c169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fee0e8e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc0cf63b9f R14: 00007fee0f592300 R15: 0000000000022000
 </TASK>
==================================================================

---
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