[v6.6] general protection fault in btrfs_root_node
0 views
Skip to first unread message
syzbot
Dec 30, 2025, 7:00:26 AM (10 days ago) 12/30/25
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 5fa4793a2d2d Linux 6.6.119
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1208549a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=691a6769a86ac817
dashboard link: https://syzkaller.appspot.com/bug?extid=4ae02193d2fd76fd07e2
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/63699875f1dd/disk-5fa4793a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8506652fcb6f/vmlinux-5fa4793a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1b30ceed1710/bzImage-5fa4793a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4ae021...@syzkaller.appspotmail.com
BTRFS info (device loop2): use no compression
BTRFS info (device loop2): using free space tree
BTRFS error (device loop2): failed to load root extent
BTRFS info (device loop2): enabling ssd optimizations
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 12373 Comm: syz.2.1336 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:btrfs_root_node+0x7f/0x3a0 fs/btrfs/ctree.c:260
Code: e7 7c f7 fd 48 83 c4 08 e8 2e 01 f8 06 89 c5 31 ff 89 c6 e8 43 18 16 fe 85 ed 74 17 e8 8a 1d 00 fe 84 c0 74 1c e8 81 14 16 fe <42> 80 3c 2b 00 75 4b eb 51 e8 73 14 16 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc900036e7598 EFLAGS: 00010287
RAX: ffffffff836f7c3f RBX: 0000000000000003 RCX: 0000000000080000
RDX: ffffc90015706000 RSI: 000000000007308a RDI: 000000000007308b
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff21b28a0
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff836f7bfc
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000038
FS: 00007ff45526b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556c81808 CR3: 0000000069043000 CR4: 00000000003506f0
Call Trace:
<TASK>
btrfs_read_lock_root_node+0x82/0x3a0 fs/btrfs/locking.c:278
btrfs_build_ref_tree+0x11e/0x1200 fs/btrfs/ref-verify.c:1005
open_ctree+0x22cc/0x2ce0 fs/btrfs/disk-io.c:3539
btrfs_fill_super+0x1c2/0x300 fs/btrfs/super.c:1163
btrfs_mount_root+0x8be/0x920 fs/btrfs/super.c:1527
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
fc_mount fs/namespace.c:1117 [inline]
vfs_kern_mount+0xbe/0x160 fs/namespace.c:1147
btrfs_mount+0x2e1/0xa70 fs/btrfs/super.c:1587
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff454390eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff45526ae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff45526aef0 RCX: 00007ff454390eea
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007ff45526aeb0
RBP: 0000200000000000 R08: 00007ff45526aef0 R09: 000000000001c005
R10: 000000000001c005 R11: 0000000000000246 R12: 0000200000000040
R13: 00007ff45526aeb0 R14: 00000000000055ae R15: 00002000000003c0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x7f/0x3a0 fs/btrfs/ctree.c:260
Code: e7 7c f7 fd 48 83 c4 08 e8 2e 01 f8 06 89 c5 31 ff 89 c6 e8 43 18 16 fe 85 ed 74 17 e8 8a 1d 00 fe 84 c0 74 1c e8 81 14 16 fe <42> 80 3c 2b 00 75 4b eb 51 e8 73 14 16 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc900036e7598 EFLAGS: 00010287
RAX: ffffffff836f7c3f RBX: 0000000000000003 RCX: 0000000000080000
RDX: ffffc90015706000 RSI: 000000000007308a RDI: 000000000007308b
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff21b28a0
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff836f7bfc
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000038
FS: 00007ff45526b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556db7501000 CR3: 0000000069043000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
0: e7 7c out %eax,$0x7c
2: f7 fd idiv %ebp
4: 48 83 c4 08 add $0x8,%rsp
8: e8 2e 01 f8 06 call 0x6f8013b
d: 89 c5 mov %eax,%ebp
f: 31 ff xor %edi,%edi
11: 89 c6 mov %eax,%esi
13: e8 43 18 16 fe call 0xfe16185b
18: 85 ed test %ebp,%ebp
1a: 74 17 je 0x33
1c: e8 8a 1d 00 fe call 0xfe001dab
21: 84 c0 test %al,%al
23: 74 1c je 0x41
25: e8 81 14 16 fe call 0xfe1614ab
* 2a: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction
2f: 75 4b jne 0x7c
31: eb 51 jmp 0x84
33: e8 73 14 16 fe call 0xfe1614ab
38: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1)
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 syzk...@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 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
syzbot found the following issue on:
HEAD commit: 5fa4793a2d2d Linux 6.6.119
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1208549a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=691a6769a86ac817
dashboard link: https://syzkaller.appspot.com/bug?extid=4ae02193d2fd76fd07e2
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/63699875f1dd/disk-5fa4793a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8506652fcb6f/vmlinux-5fa4793a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1b30ceed1710/bzImage-5fa4793a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4ae021...@syzkaller.appspotmail.com
BTRFS info (device loop2): use no compression
BTRFS info (device loop2): using free space tree
BTRFS error (device loop2): failed to load root extent
BTRFS info (device loop2): enabling ssd optimizations
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 12373 Comm: syz.2.1336 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:btrfs_root_node+0x7f/0x3a0 fs/btrfs/ctree.c:260
Code: e7 7c f7 fd 48 83 c4 08 e8 2e 01 f8 06 89 c5 31 ff 89 c6 e8 43 18 16 fe 85 ed 74 17 e8 8a 1d 00 fe 84 c0 74 1c e8 81 14 16 fe <42> 80 3c 2b 00 75 4b eb 51 e8 73 14 16 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc900036e7598 EFLAGS: 00010287
RAX: ffffffff836f7c3f RBX: 0000000000000003 RCX: 0000000000080000
RDX: ffffc90015706000 RSI: 000000000007308a RDI: 000000000007308b
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff21b28a0
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff836f7bfc
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000038
FS: 00007ff45526b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556c81808 CR3: 0000000069043000 CR4: 00000000003506f0
Call Trace:
<TASK>
btrfs_read_lock_root_node+0x82/0x3a0 fs/btrfs/locking.c:278
btrfs_build_ref_tree+0x11e/0x1200 fs/btrfs/ref-verify.c:1005
open_ctree+0x22cc/0x2ce0 fs/btrfs/disk-io.c:3539
btrfs_fill_super+0x1c2/0x300 fs/btrfs/super.c:1163
btrfs_mount_root+0x8be/0x920 fs/btrfs/super.c:1527
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
fc_mount fs/namespace.c:1117 [inline]
vfs_kern_mount+0xbe/0x160 fs/namespace.c:1147
btrfs_mount+0x2e1/0xa70 fs/btrfs/super.c:1587
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff454390eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff45526ae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff45526aef0 RCX: 00007ff454390eea
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007ff45526aeb0
RBP: 0000200000000000 R08: 00007ff45526aef0 R09: 000000000001c005
R10: 000000000001c005 R11: 0000000000000246 R12: 0000200000000040
R13: 00007ff45526aeb0 R14: 00000000000055ae R15: 00002000000003c0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x7f/0x3a0 fs/btrfs/ctree.c:260
Code: e7 7c f7 fd 48 83 c4 08 e8 2e 01 f8 06 89 c5 31 ff 89 c6 e8 43 18 16 fe 85 ed 74 17 e8 8a 1d 00 fe 84 c0 74 1c e8 81 14 16 fe <42> 80 3c 2b 00 75 4b eb 51 e8 73 14 16 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc900036e7598 EFLAGS: 00010287
RAX: ffffffff836f7c3f RBX: 0000000000000003 RCX: 0000000000080000
RDX: ffffc90015706000 RSI: 000000000007308a RDI: 000000000007308b
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff21b28a0
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff836f7bfc
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000038
FS: 00007ff45526b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556db7501000 CR3: 0000000069043000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
0: e7 7c out %eax,$0x7c
2: f7 fd idiv %ebp
4: 48 83 c4 08 add $0x8,%rsp
8: e8 2e 01 f8 06 call 0x6f8013b
d: 89 c5 mov %eax,%ebp
f: 31 ff xor %edi,%edi
11: 89 c6 mov %eax,%esi
13: e8 43 18 16 fe call 0xfe16185b
18: 85 ed test %ebp,%ebp
1a: 74 17 je 0x33
1c: e8 8a 1d 00 fe call 0xfe001dab
21: 84 c0 test %al,%al
23: 74 1c je 0x41
25: e8 81 14 16 fe call 0xfe1614ab
* 2a: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction
2f: 75 4b jne 0x7c
31: eb 51 jmp 0x84
33: e8 73 14 16 fe call 0xfe1614ab
38: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1)
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 syzk...@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 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
syzbot
Dec 30, 2025, 8:02:29 AM (10 days ago) 12/30/25
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 5fa4793a2d2d Linux 6.6.119
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12f8549a580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14891792580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/63699875f1dd/disk-5fa4793a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8506652fcb6f/vmlinux-5fa4793a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1b30ceed1710/bzImage-5fa4793a.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/e102717772e2/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=17091792580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4ae021...@syzkaller.appspotmail.com
BTRFS info (device loop0): using free space tree
BTRFS error (device loop0): failed to load root extent
BTRFS info (device loop0): enabling ssd optimizations
RAX: ffffffff836f7c3f RBX: 0000000000000003 RCX: ffff888029e29e00
RDX: 0000000000000000 RSI: ffffffff8afc6f60 RDI: ffffffff8afc6f20
RAX: ffffffffffffffda RBX: 00007ffc96543d40 RCX: 00007fc88d190eea
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007ffc96543d00
RBP: 0000200000000000 R08: 00007ffc96543d40 R09: 000000000001c005
RAX: ffffffff836f7c3f RBX: 0000000000000003 RCX: ffff888029e29e00
RDX: 0000000000000000 RSI: ffffffff8afc6f60 RDI: ffffffff8afc6f20
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: 5fa4793a2d2d Linux 6.6.119
git tree: linux-6.6.y
kernel config: https://syzkaller.appspot.com/x/.config?x=691a6769a86ac817
dashboard link: https://syzkaller.appspot.com/bug?extid=4ae02193d2fd76fd07e2
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=10891792580000
dashboard link: https://syzkaller.appspot.com/bug?extid=4ae02193d2fd76fd07e2
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14891792580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/63699875f1dd/disk-5fa4793a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8506652fcb6f/vmlinux-5fa4793a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1b30ceed1710/bzImage-5fa4793a.xz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=17091792580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4ae021...@syzkaller.appspotmail.com
BTRFS error (device loop0): failed to load root extent
BTRFS info (device loop0): enabling ssd optimizations
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 5927 Comm: syz.0.17 Not tainted syzkaller #0
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:btrfs_root_node+0x7f/0x3a0 fs/btrfs/ctree.c:260
Code: e7 7c f7 fd 48 83 c4 08 e8 2e 01 f8 06 89 c5 31 ff 89 c6 e8 43 18 16 fe 85 ed 74 17 e8 8a 1d 00 fe 84 c0 74 1c e8 81 14 16 fe <42> 80 3c 2b 00 75 4b eb 51 e8 73 14 16 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc90002e57598 EFLAGS: 00010293
RIP: 0010:btrfs_root_node+0x7f/0x3a0 fs/btrfs/ctree.c:260
Code: e7 7c f7 fd 48 83 c4 08 e8 2e 01 f8 06 89 c5 31 ff 89 c6 e8 43 18 16 fe 85 ed 74 17 e8 8a 1d 00 fe 84 c0 74 1c e8 81 14 16 fe <42> 80 3c 2b 00 75 4b eb 51 e8 73 14 16 fe 42 80 3c 2b 00 75 3d eb
RAX: ffffffff836f7c3f RBX: 0000000000000003 RCX: ffff888029e29e00
RDX: 0000000000000000 RSI: ffffffff8afc6f60 RDI: ffffffff8afc6f20
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff21b28a0
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff836f7bfc
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000038
FS: 0000555559b5a500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff836f7bfc
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000038
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560ff4c4d5f8 CR3: 0000000076428000 CR4: 00000000003506f0
Call Trace:
<TASK>
btrfs_read_lock_root_node+0x82/0x3a0 fs/btrfs/locking.c:278
btrfs_build_ref_tree+0x11e/0x1200 fs/btrfs/ref-verify.c:1005
open_ctree+0x22cc/0x2ce0 fs/btrfs/disk-io.c:3539
btrfs_fill_super+0x1c2/0x300 fs/btrfs/super.c:1163
btrfs_mount_root+0x8be/0x920 fs/btrfs/super.c:1527
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
fc_mount fs/namespace.c:1117 [inline]
vfs_kern_mount+0xbe/0x160 fs/namespace.c:1147
btrfs_mount+0x2e1/0xa70 fs/btrfs/super.c:1587
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc88d190eea
<TASK>
btrfs_read_lock_root_node+0x82/0x3a0 fs/btrfs/locking.c:278
btrfs_build_ref_tree+0x11e/0x1200 fs/btrfs/ref-verify.c:1005
open_ctree+0x22cc/0x2ce0 fs/btrfs/disk-io.c:3539
btrfs_fill_super+0x1c2/0x300 fs/btrfs/super.c:1163
btrfs_mount_root+0x8be/0x920 fs/btrfs/super.c:1527
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
fc_mount fs/namespace.c:1117 [inline]
vfs_kern_mount+0xbe/0x160 fs/namespace.c:1147
btrfs_mount+0x2e1/0xa70 fs/btrfs/super.c:1587
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc96543cb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc96543d40 RCX: 00007fc88d190eea
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007ffc96543d00
RBP: 0000200000000000 R08: 00007ffc96543d40 R09: 000000000001c005
R10: 000000000001c005 R11: 0000000000000246 R12: 0000200000000040
R13: 00007ffc96543d00 R14: 00000000000055ae R15: 00002000000003c0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x7f/0x3a0 fs/btrfs/ctree.c:260
Code: e7 7c f7 fd 48 83 c4 08 e8 2e 01 f8 06 89 c5 31 ff 89 c6 e8 43 18 16 fe 85 ed 74 17 e8 8a 1d 00 fe 84 c0 74 1c e8 81 14 16 fe <42> 80 3c 2b 00 75 4b eb 51 e8 73 14 16 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc90002e57598 EFLAGS: 00010293
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x7f/0x3a0 fs/btrfs/ctree.c:260
Code: e7 7c f7 fd 48 83 c4 08 e8 2e 01 f8 06 89 c5 31 ff 89 c6 e8 43 18 16 fe 85 ed 74 17 e8 8a 1d 00 fe 84 c0 74 1c e8 81 14 16 fe <42> 80 3c 2b 00 75 4b eb 51 e8 73 14 16 fe 42 80 3c 2b 00 75 3d eb
RAX: ffffffff836f7c3f RBX: 0000000000000003 RCX: ffff888029e29e00
RDX: 0000000000000000 RSI: ffffffff8afc6f60 RDI: ffffffff8afc6f20
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff21b28a0
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff836f7bfc
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000038
FS: 0000555559b5a500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff836f7bfc
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000038
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd2eb1909c0 CR3: 0000000076428000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
0: e7 7c out %eax,$0x7c
2: f7 fd idiv %ebp
4: 48 83 c4 08 add $0x8,%rsp
8: e8 2e 01 f8 06 call 0x6f8013b
d: 89 c5 mov %eax,%ebp
f: 31 ff xor %edi,%edi
11: 89 c6 mov %eax,%esi
13: e8 43 18 16 fe call 0xfe16185b
18: 85 ed test %ebp,%ebp
1a: 74 17 je 0x33
1c: e8 8a 1d 00 fe call 0xfe001dab
21: 84 c0 test %al,%al
23: 74 1c je 0x41
25: e8 81 14 16 fe call 0xfe1614ab
* 2a: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction
2f: 75 4b jne 0x7c
31: eb 51 jmp 0x84
33: e8 73 14 16 fe call 0xfe1614ab
38: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1)
3d: 75 3d jne 0x7c
3f: eb .byte 0xeb
---
If you want syzbot to run the reproducer, reply with:
Code disassembly (best guess):
0: e7 7c out %eax,$0x7c
2: f7 fd idiv %ebp
4: 48 83 c4 08 add $0x8,%rsp
8: e8 2e 01 f8 06 call 0x6f8013b
d: 89 c5 mov %eax,%ebp
f: 31 ff xor %edi,%edi
11: 89 c6 mov %eax,%esi
13: e8 43 18 16 fe call 0xfe16185b
18: 85 ed test %ebp,%ebp
1a: 74 17 je 0x33
1c: e8 8a 1d 00 fe call 0xfe001dab
21: 84 c0 test %al,%al
23: 74 1c je 0x41
25: e8 81 14 16 fe call 0xfe1614ab
* 2a: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction
2f: 75 4b jne 0x7c
31: eb 51 jmp 0x84
33: e8 73 14 16 fe call 0xfe1614ab
38: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1)
3d: 75 3d jne 0x7c
3f: eb .byte 0xeb
---
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
Reply all
Reply to author
Forward
0 new messages