| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <68faec0c.a70a0220.3bf6c6.00ea.GAE@google.com> Date: Thu, 23 Oct 2025 20:01:32 -0700 From: syzbot <syzbot+d991fea1b4b23b1f6bf8@...kaller.appspotmail.com> To: clm@...com, dsterba@...e.com, josef@...icpanda.com, linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com, mhiramat@...nel.org, mssola@...ola.com, rostedt@...dmis.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [btrfs?] general protection fault in btrfs_evict_inode syzbot has found a reproducer for the following issue on: HEAD commit: ab431bc39741 Merge tag 'net-6.18-rc3' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16acae7c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=df98b4d1d5944c56 dashboard link: https://syzkaller.appspot.com/bug?extid=d991fea1b4b23b1f6bf8 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11acae7c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=121e0be2580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ab431bc3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1d39c25550bc/vmlinux-ab431bc3.xz kernel image: https://storage.googleapis.com/syzbot-assets/5dafbb4c36ac/bzImage-ab431bc3.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/9c180a1c4631/mount_2.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=14407734580000) mounted in repro #2: https://storage.googleapis.com/syzbot-assets/54ad7c21e681/mount_6.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d991fea1b4b23b1f6bf8@...kaller.appspotmail.com BTRFS info (device loop0): enabling auto defrag BTRFS info (device loop0): force zlib compression, level 3 BTRFS info (device loop0): max_inline set to 0 Oops: general protection fault, probably for non-canonical address 0xdffffc000000003e: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000001f0-0x00000000000001f7] CPU: 0 UID: 0 PID: 5490 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 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_id fs/btrfs/ctree.h:333 [inline] RIP: 0010:do_perf_trace_btrfs__inode include/trace/events/btrfs.h:204 [inline] RIP: 0010:perf_trace_btrfs__inode+0x44d/0x580 include/trace/events/btrfs.h:204 Code: c1 e8 03 42 80 3c 30 00 74 08 4c 89 ff e8 db 43 66 fe 4d 8b 2f 4d 8d bd f7 01 00 00 49 81 c5 fe 01 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 e4 00 00 00 4c 89 e8 48 c1 e8 03 42 0f RSP: 0018:ffffc90002b7f800 EFLAGS: 00010203 RAX: 000000000000003e RBX: ffffe8ffffc4ec68 RCX: ffffffff83c10ce7 RDX: 0000000000000010 RSI: ffff888058f38000 RDI: ffffe8ffffc4ec30 RBP: ffffc90002b7f8d0 R08: 7c477e297af65e39 R09: 5d3eb9a580cd6d81 R10: 7c477e297af65e39 R11: 5d3eb9a580cd6d81 R12: ffffe8ffffc4ec28 R13: 00000000000001fe R14: dffffc0000000000 R15: 00000000000001f7 FS: 000055557f4fd500(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564f8ff39890 CR3: 0000000012254000 CR4: 0000000000352ef0 Call Trace: <TASK> __do_trace_btrfs_inode_evict include/trace/events/btrfs.h:255 [inline] trace_btrfs_inode_evict include/trace/events/btrfs.h:255 [inline] btrfs_evict_inode+0x107a/0x1110 fs/btrfs/inode.c:5480 evict+0x504/0x9c0 fs/inode.c:810 btrfs_create_common+0x1c9/0x230 fs/btrfs/inode.c:6800 btrfs_mkdir+0xc7/0xf0 fs/btrfs/inode.c:6927 vfs_mkdir+0x306/0x510 fs/namei.c:4453 do_mkdirat+0x247/0x590 fs/namei.c:4486 __do_sys_mkdirat fs/namei.c:4503 [inline] __se_sys_mkdirat fs/namei.c:4501 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4501 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2decb8d717 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 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:00007ffd6e980498 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007ffd6e980520 RCX: 00007f2decb8d717 RDX: 00000000000001ff RSI: 0000200000000140 RDI: 00000000ffffff9c RBP: 0000200000000180 R08: 00002000000000c0 R09: 0000000000000000 R10: 0000200000000180 R11: 0000000000000246 R12: 0000200000000140 R13: 00007ffd6e9804e0 R14: 0000000000000000 R15: 0000200000000080 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_id fs/btrfs/ctree.h:333 [inline] RIP: 0010:do_perf_trace_btrfs__inode include/trace/events/btrfs.h:204 [inline] RIP: 0010:perf_trace_btrfs__inode+0x44d/0x580 include/trace/events/btrfs.h:204 Code: c1 e8 03 42 80 3c 30 00 74 08 4c 89 ff e8 db 43 66 fe 4d 8b 2f 4d 8d bd f7 01 00 00 49 81 c5 fe 01 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 e4 00 00 00 4c 89 e8 48 c1 e8 03 42 0f RSP: 0018:ffffc90002b7f800 EFLAGS: 00010203 RAX: 000000000000003e RBX: ffffe8ffffc4ec68 RCX: ffffffff83c10ce7 RDX: 0000000000000010 RSI: ffff888058f38000 RDI: ffffe8ffffc4ec30 RBP: ffffc90002b7f8d0 R08: 7c477e297af65e39 R09: 5d3eb9a580cd6d81 R10: 7c477e297af65e39 R11: 5d3eb9a580cd6d81 R12: ffffe8ffffc4ec28 R13: 00000000000001fe R14: dffffc0000000000 R15: 00000000000001f7 FS: 000055557f4fd500(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564f8ff39890 CR3: 0000000012254000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 8: 74 08 je 0x12 a: 4c 89 ff mov %r15,%rdi d: e8 db 43 66 fe call 0xfe6643ed 12: 4d 8b 2f mov (%r15),%r13 15: 4d 8d bd f7 01 00 00 lea 0x1f7(%r13),%r15 1c: 49 81 c5 fe 01 00 00 add $0x1fe,%r13 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 e4 00 00 00 jne 0x11b 37: 4c 89 e8 mov %r13,%rax 3a: 48 c1 e8 03 shr $0x3,%rax 3e: 42 rex.X 3f: 0f .byte 0xf --- 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.
Powered by blists - more mailing lists