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Message-ID: <0000000000001b6052062139be1c@google.com> Date: Tue, 03 Sep 2024 09:42:26 -0700 From: syzbot <syzbot+9c3e0cdfbfe351b0bc0e@...kaller.appspotmail.com> To: clm@...com, dsterba@...e.com, josef@...icpanda.com, linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [btrfs?] general protection fault in btrfs_root_node Hello, syzbot found the following issue on: HEAD commit: 20371ba12063 Merge tag 'drm-fixes-2024-08-30' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16206c53980000 kernel config: https://syzkaller.appspot.com/x/.config?x=996585887acdadb3 dashboard link: https://syzkaller.appspot.com/bug?extid=9c3e0cdfbfe351b0bc0e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16778a63980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14924339980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-20371ba1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/35987fde8063/vmlinux-20371ba1.xz kernel image: https://storage.googleapis.com/syzbot-assets/1012e3751087/bzImage-20371ba1.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/892f30044c3a/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9c3e0cdfbfe351b0bc0e@...kaller.appspotmail.com BTRFS info (device loop0): using crc32c (crc32c-intel) checksum algorithm BTRFS info (device loop0): using free-space-tree Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 5105 Comm: syz-executor368 Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260 Code: a0 aa c8 fd 48 83 c4 08 e8 47 80 12 08 89 c3 31 ff 89 c6 e8 4c 6f ec fd 85 db 74 17 e8 33 a1 d2 fd 84 c0 74 1c e8 fa 6a ec fd <43> 80 3c 3c 00 75 4b eb 51 e8 ec 6a ec fd 43 80 3c 3c 00 75 3d eb RSP: 0018:ffffc90000e376c0 EFLAGS: 00010293 RAX: ffffffff83a72136 RBX: 0000000000000001 RCX: ffff888000784880 RDX: 0000000000000000 RSI: ffffffff8c608d20 RDI: ffffffff8c608ce0 RBP: ffffc90000e378b0 R08: ffffffff83a72124 R09: 1ffffffff283c908 R10: dffffc0000000000 R11: fffffbfff283c909 R12: 0000000000000003 R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000 FS: 0000555578f7a380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f674dc59068 CR3: 0000000034fa8000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:279 btrfs_build_ref_tree+0x112/0x16f0 fs/btrfs/ref-verify.c:1005 open_ctree+0x1fea/0x2a10 fs/btrfs/disk-io.c:3533 btrfs_fill_super fs/btrfs/super.c:965 [inline] btrfs_get_tree_super fs/btrfs/super.c:1888 [inline] btrfs_get_tree+0xe7a/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 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 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: 0033:0x7f3e4d3e7eea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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:00007ffcc9f71558 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffcc9f71560 RCX: 00007f3e4d3e7eea RDX: 0000000020005100 RSI: 0000000020000040 RDI: 00007ffcc9f71560 RBP: 0000000000000004 R08: 00007ffcc9f715a0 R09: 0000000000005110 R10: 0000000000a08811 R11: 0000000000000282 R12: 00007ffcc9f715a0 R13: 0000000000000003 R14: 0000000001000000 R15: 00007f3e4d42f03b </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260 Code: a0 aa c8 fd 48 83 c4 08 e8 47 80 12 08 89 c3 31 ff 89 c6 e8 4c 6f ec fd 85 db 74 17 e8 33 a1 d2 fd 84 c0 74 1c e8 fa 6a ec fd <43> 80 3c 3c 00 75 4b eb 51 e8 ec 6a ec fd 43 80 3c 3c 00 75 3d eb RSP: 0018:ffffc90000e376c0 EFLAGS: 00010293 RAX: ffffffff83a72136 RBX: 0000000000000001 RCX: ffff888000784880 RDX: 0000000000000000 RSI: ffffffff8c608d20 RDI: ffffffff8c608ce0 RBP: ffffc90000e378b0 R08: ffffffff83a72124 R09: 1ffffffff283c908 R10: dffffc0000000000 R11: fffffbfff283c909 R12: 0000000000000003 R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000 FS: 0000555578f7a380(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005610c6449d38 CR3: 0000000034fa8000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: a0 aa c8 fd 48 83 c4 movabs 0xe808c48348fdc8aa,%al 7: 08 e8 9: 47 80 12 08 rex.RXB adcb $0x8,(%r10) d: 89 c3 mov %eax,%ebx f: 31 ff xor %edi,%edi 11: 89 c6 mov %eax,%esi 13: e8 4c 6f ec fd call 0xfdec6f64 18: 85 db test %ebx,%ebx 1a: 74 17 je 0x33 1c: e8 33 a1 d2 fd call 0xfdd2a154 21: 84 c0 test %al,%al 23: 74 1c je 0x41 25: e8 fa 6a ec fd call 0xfdec6b24 * 2a: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) <-- trapping instruction 2f: 75 4b jne 0x7c 31: eb 51 jmp 0x84 33: e8 ec 6a ec fd call 0xfdec6b24 38: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) 3d: 75 3d jne 0x7c 3f: eb .byte 0xeb --- 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@...glegroups.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
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