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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a69:b0:3a0:9954:a6fa with SMTP id e9e14a558f8ab-3a397ce58abmr34572735ab.9.1728520143261; Wed, 09 Oct 2024 17:29:03 -0700 (PDT) Date: Wed, 09 Oct 2024 17:29:03 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67071fcf.050a0220.1139e6.0013.GAE@google.com> Subject: Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2) From: syzbot To: clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, quwenruo.btrfs@gmx.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in getname_kernel Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 6008 Comm: syz.0.15 Not tainted 6.12.0-rc2-syzkaller-00045-g964c2da72390 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:strlen+0x2c/0x70 lib/string.c:402 Code: 1e fa 41 57 41 56 41 54 53 49 89 fe 48 c7 c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01 RSP: 0018:ffffc900035af8a8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802d46bc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff942c58f7 R09: 1ffffffff2858b1e R10: dffffc0000000000 R11: fffffbfff2858b1f R12: ffffffffffffffff R13: ffff8880727f8000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f01495d76c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f75ffff CR3: 000000002cffe000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: getname_kernel+0x1d/0x2f0 fs/namei.c:232 kern_path+0x1d/0x50 fs/namei.c:2716 is_good_dev_path fs/btrfs/volumes.c:760 [inline] btrfs_scan_one_device+0x19e/0xd90 fs/btrfs/volumes.c:1492 btrfs_get_tree_super fs/btrfs/super.c:1841 [inline] btrfs_get_tree+0x30e/0x1920 fs/btrfs/super.c:2114 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 fc_mount+0x1b/0xb0 fs/namespace.c:1231 btrfs_get_tree_subvol fs/btrfs/super.c:2077 [inline] btrfs_get_tree+0x652/0x1920 fs/btrfs/super.c:2115 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 vfs_cmd_create+0xa0/0x1f0 fs/fsopen.c:225 __do_sys_fsconfig fs/fsopen.c:472 [inline] __se_sys_fsconfig+0xa1f/0xf70 fs/fsopen.c:344 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f014877dff9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f01495d7038 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007f0148935f80 RCX: 00007f014877dff9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 00007f01487f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0148935f80 R15: 00007ffe7a9c13b8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:strlen+0x2c/0x70 lib/string.c:402 Code: 1e fa 41 57 41 56 41 54 53 49 89 fe 48 c7 c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01 RSP: 0018:ffffc900035af8a8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802d46bc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff942c58f7 R09: 1ffffffff2858b1e R10: dffffc0000000000 R11: fffffbfff2858b1f R12: ffffffffffffffff R13: ffff8880727f8000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f01495d76c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f75ffff CR3: 000000002cffe000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: fa cli 1: 41 57 push %r15 3: 41 56 push %r14 5: 41 54 push %r12 7: 53 push %rbx 8: 49 89 fe mov %rdi,%r14 b: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax 12: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 19: fc ff df 1c: 48 89 fb mov %rdi,%rbx 1f: 49 89 c4 mov %rax,%r12 22: 48 89 d8 mov %rbx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 75 12 jne 0x44 32: 48 ff c3 inc %rbx 35: 49 8d 44 24 01 lea 0x1(%r12),%rax 3a: 43 rex.XB 3b: 80 .byte 0x80 3c: 7c 26 jl 0x64 3e: 01 .byte 0x1 Tested on: commit: 964c2da7 btrfs: make buffered write to copy one page a.. git tree: https://github.com/adam900710/linux.git subpage_read console output: https://syzkaller.appspot.com/x/log.txt?x=1296b7d0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3ec5955a0d4f6ede dashboard link: https://syzkaller.appspot.com/bug?extid=cee29f5a48caf10cd475 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Note: no patches were applied.