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AJvYcCX3b3M10YqJI72y6pQeRqUgF5IJeQQVTiRmDj9hXFxWHSmQe0QP9/FBdS1MqPtWv9pBynUW@lists.linux.dev X-Gm-Message-State: AOJu0YzhzJMczuUeaXR/ZcKqk/PnxQTnPzAr/jzbY8DyhkHbD2GWE7gt 7H9Saj5vEdFOf1OHkLwH0/WDGiYMEPHPrXK4V8Nr1nVJnEX3WIRgW4WJMxFNpMQ8q/lPsrY370x VEM1CcJZu0XRvqPelSQqzys+a4fNANEL3cbCofATDkIUpOWdhTpdr1K1FjdQ= X-Google-Smtp-Source: AGHT+IESvahhBxYUK9kRHcmEf6chOXuOS2AtMtb4+uPOpNRysMHCWuXScZAprAKKIQ6yhYcGGSOCY7DZ1CsfZhaANaB/vwzRmW7k Precedence: bulk X-Mailing-List: gfs2@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:6d17:b0:85b:3ae9:da01 with SMTP id ca18e2360f4ac-86cadd5ffbcmr1098803539f.4.1748257412437; Mon, 26 May 2025 04:03:32 -0700 (PDT) Date: Mon, 26 May 2025 04:03:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68344a84.a70a0220.1765ec.0166.GAE@google.com> Subject: [syzbot] [gfs2?] KASAN: null-ptr-deref Read in gfs2_drop_inode From: syzbot To: agruenba@redhat.com, gfs2@lists.linux.dev, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 176e917e010c Add linux-next specific files for 20250523 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=135065f4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e7902c752bef748 dashboard link: https://syzkaller.appspot.com/bug?extid=b12826218502df019f9d compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151759f4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16b9c5f4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5f7692c642fa/disk-176e917e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/057a442d42d0/vmlinux-176e917e.xz kernel image: https://storage.googleapis.com/syzbot-assets/8f8ebdb4dd96/bzImage-176e917e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/0e694bf0a04e/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=16e42170580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b12826218502df019f9d@syzkaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: null-ptr-deref in gfs2_drop_inode+0x20c/0x3a0 fs/gfs2/super.c:1052 Read of size 8 at addr 00000000000000a8 by task syz-executor628/5863 CPU: 0 UID: 0 PID: 5863 Comm: syz-executor628 Not tainted 6.15.0-rc7-next-20250523-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 kasan_report+0x118/0x150 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] gfs2_drop_inode+0x20c/0x3a0 fs/gfs2/super.c:1052 iput_final fs/inode.c:1868 [inline] iput+0x45d/0x9d0 fs/inode.c:1924 gfs2_fill_super+0x1418/0x2010 fs/gfs2/ops_fstype.c:1314 get_tree_bdev_flags+0x40b/0x4d0 fs/super.c:1679 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1333 vfs_get_tree+0x92/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3869 do_mount fs/namespace.c:4206 [inline] __do_sys_mount fs/namespace.c:4417 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4394 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f219bad284a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 6e 07 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdb657b2f8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f219bad284a RDX: 0000200000021140 RSI: 0000200000021180 RDI: 00007ffdb657b350 RBP: 0000000000000004 R08: 00007ffdb657b390 R09: 0000000000021135 R10: 0000000000000000 R11: 0000000000000282 R12: 0000000001000000 R13: 00007ffdb657b390 R14: 0000200000021180 R15: 0000000000000003 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup