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Mon, 02 Jun 2025 05:05:34 -0700 (PDT) Date: Mon, 02 Jun 2025 05:05:34 -0700 In-Reply-To: <68344a84.a70a0220.1765ec.0166.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <683d938e.a00a0220.d8eae.004f.GAE@google.com> Subject: Re: [syzbot] Re: [syzbot] [gfs2?] KASAN: null-ptr-deref Read in gfs2_drop_inode From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [gfs2?] KASAN: null-ptr-deref Read in gfs2_drop_inode Author: anprice@redhat.com #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git for-next On 26/05/2025 12:03, syzbot wrote: > 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 >