* [syzbot] [btrfs?] general protection fault in getname_kernel (2)
@ 2024-10-09 13:48 syzbot
2024-10-09 23:21 ` Qu Wenruo
2024-10-10 4:30 ` syzbot
0 siblings, 2 replies; 8+ messages in thread
From: syzbot @ 2024-10-09 13:48 UTC (permalink / raw)
To: clm, dsterba, josef, linux-btrfs, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 33ce24234fca Add linux-next specific files for 20241008
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10df97d0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4750ca93740b938d
dashboard link: https://syzkaller.appspot.com/bug?extid=cee29f5a48caf10cd475
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=160ce327980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15ea7707980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ee8dc2df0c57/disk-33ce2423.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dc473c0fa06e/vmlinux-33ce2423.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4671f1ca2e61/bzImage-33ce2423.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cee29f5a48caf10cd475@syzkaller.appspotmail.com
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: 0 UID: 0 PID: 5235 Comm: syz-executor338 Not tainted 6.12.0-rc2-next-20241008-syzkaller #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:ffffc90003b7f8a8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802c5cda00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff901d3f2f R09: 1ffffffff203a7e5
R10: dffffc0000000000 R11: fffffbfff203a7e6 R12: ffffffffffffffff
R13: ffff888028a7e000 R14: 0000000000000000 R15: dffffc0000000000
FS: 000055557da91380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 000000004fdaa000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
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:1484
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: 0033:0x7fe8c78542a9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd2c4992f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007ffd2c4994c8 RCX: 00007fe8c78542a9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007fe8c78c7610 R08: 0000000000000000 R09: 00007ffd2c4994c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd2c4994b8 R14: 0000000000000001 R15: 0000000000000001
</TASK>
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:ffffc90003b7f8a8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802c5cda00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff901d3f2f R09: 1ffffffff203a7e5
R10: dffffc0000000000 R11: fffffbfff203a7e6 R12: ffffffffffffffff
R13: ffff888028a7e000 R14: 0000000000000000 R15: dffffc0000000000
FS: 000055557da91380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005606b6327058 CR3: 000000004fdaa000 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
---
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
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2)
2024-10-09 13:48 [syzbot] [btrfs?] general protection fault in getname_kernel (2) syzbot
@ 2024-10-09 23:21 ` Qu Wenruo
2024-10-10 0:29 ` syzbot
2024-10-10 4:30 ` syzbot
1 sibling, 1 reply; 8+ messages in thread
From: Qu Wenruo @ 2024-10-09 23:21 UTC (permalink / raw)
To: syzbot, clm, dsterba, josef, linux-btrfs, linux-kernel,
syzkaller-bugs
#syz test: https://github.com/adam900710/linux.git subpage_read
在 2024/10/10 00:18, syzbot 写道:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 33ce24234fca Add linux-next specific files for 20241008
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=10df97d0580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=4750ca93740b938d
> dashboard link: https://syzkaller.appspot.com/bug?extid=cee29f5a48caf10cd475
> 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=160ce327980000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15ea7707980000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/ee8dc2df0c57/disk-33ce2423.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/dc473c0fa06e/vmlinux-33ce2423.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/4671f1ca2e61/bzImage-33ce2423.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+cee29f5a48caf10cd475@syzkaller.appspotmail.com
>
> 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: 0 UID: 0 PID: 5235 Comm: syz-executor338 Not tainted 6.12.0-rc2-next-20241008-syzkaller #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:ffffc90003b7f8a8 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802c5cda00
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 0000000000000000 R08: ffffffff901d3f2f R09: 1ffffffff203a7e5
> R10: dffffc0000000000 R11: fffffbfff203a7e6 R12: ffffffffffffffff
> R13: ffff888028a7e000 R14: 0000000000000000 R15: dffffc0000000000
> FS: 000055557da91380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000200000c0 CR3: 000000004fdaa000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> 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:1484
> 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: 0033:0x7fe8c78542a9
> Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffd2c4992f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
> RAX: ffffffffffffffda RBX: 00007ffd2c4994c8 RCX: 00007fe8c78542a9
> RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
> RBP: 00007fe8c78c7610 R08: 0000000000000000 R09: 00007ffd2c4994c8
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
> R13: 00007ffd2c4994b8 R14: 0000000000000001 R15: 0000000000000001
> </TASK>
> 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:ffffc90003b7f8a8 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802c5cda00
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 0000000000000000 R08: ffffffff901d3f2f R09: 1ffffffff203a7e5
> R10: dffffc0000000000 R11: fffffbfff203a7e6 R12: ffffffffffffffff
> R13: ffff888028a7e000 R14: 0000000000000000 R15: dffffc0000000000
> FS: 000055557da91380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00005606b6327058 CR3: 000000004fdaa000 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
>
>
> ---
> 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
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2)
2024-10-09 23:21 ` Qu Wenruo
@ 2024-10-10 0:29 ` syzbot
2024-10-10 2:26 ` Qu Wenruo
0 siblings, 1 reply; 8+ messages in thread
From: syzbot @ 2024-10-10 0:29 UTC (permalink / raw)
To: clm, dsterba, josef, linux-btrfs, linux-kernel, quwenruo.btrfs,
syzkaller-bugs
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:
<TASK>
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
</TASK>
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.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2)
2024-10-10 0:29 ` syzbot
@ 2024-10-10 2:26 ` Qu Wenruo
2024-10-10 3:02 ` syzbot
0 siblings, 1 reply; 8+ messages in thread
From: Qu Wenruo @ 2024-10-10 2:26 UTC (permalink / raw)
To: syzbot, clm, dsterba, josef, linux-btrfs, linux-kernel,
syzkaller-bugs
#syz test: https://github.com/adam900710/linux.git subpage_read
在 2024/10/10 10:59, syzbot 写道:
> 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:
> <TASK>
> 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
> </TASK>
> 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.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2)
2024-10-10 2:26 ` Qu Wenruo
@ 2024-10-10 3:02 ` syzbot
0 siblings, 0 replies; 8+ messages in thread
From: syzbot @ 2024-10-10 3:02 UTC (permalink / raw)
To: clm, dsterba, josef, linux-btrfs, linux-kernel, quwenruo.btrfs,
syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
lost connection to test machine
Tested on:
commit: 330f0214 btrfs: handle NULL as device path for btrfs_s..
git tree: https://github.com/adam900710/linux.git subpage_read
console output: https://syzkaller.appspot.com/x/log.txt?x=122384bb980000
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.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2)
2024-10-09 13:48 [syzbot] [btrfs?] general protection fault in getname_kernel (2) syzbot
2024-10-09 23:21 ` Qu Wenruo
@ 2024-10-10 4:30 ` syzbot
2024-10-10 4:54 ` Qu Wenruo
1 sibling, 1 reply; 8+ messages in thread
From: syzbot @ 2024-10-10 4:30 UTC (permalink / raw)
To: clm, dsterba, eadavis, fdmanana, josef, linux-btrfs, linux-kernel,
quwenruo.btrfs, syzkaller-bugs, wqu
syzbot has bisected this issue to:
commit b4b3fb6c00f37a9da91022adcd83555bc339e044
Author: Qu Wenruo <wqu@suse.com>
Date: Tue Sep 24 04:57:07 2024 +0000
btrfs: canonicalize the device path before adding it
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15744f07980000
start commit: 33ce24234fca Add linux-next specific files for 20241008
git tree: linux-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=17744f07980000
console output: https://syzkaller.appspot.com/x/log.txt?x=13744f07980000
kernel config: https://syzkaller.appspot.com/x/.config?x=4750ca93740b938d
dashboard link: https://syzkaller.appspot.com/bug?extid=cee29f5a48caf10cd475
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160ce327980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15ea7707980000
Reported-by: syzbot+cee29f5a48caf10cd475@syzkaller.appspotmail.com
Fixes: b4b3fb6c00f3 ("btrfs: canonicalize the device path before adding it")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2)
2024-10-10 4:30 ` syzbot
@ 2024-10-10 4:54 ` Qu Wenruo
2024-10-10 5:37 ` syzbot
0 siblings, 1 reply; 8+ messages in thread
From: Qu Wenruo @ 2024-10-10 4:54 UTC (permalink / raw)
To: syzbot, clm, dsterba, eadavis, fdmanana, josef, linux-btrfs,
linux-kernel, syzkaller-bugs, wqu
#syz test: https://github.com/adam900710/linux.git subpage_read
在 2024/10/10 15:00, syzbot 写道:
> syzbot has bisected this issue to:
>
> commit b4b3fb6c00f37a9da91022adcd83555bc339e044
> Author: Qu Wenruo <wqu@suse.com>
> Date: Tue Sep 24 04:57:07 2024 +0000
>
> btrfs: canonicalize the device path before adding it
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15744f07980000
> start commit: 33ce24234fca Add linux-next specific files for 20241008
> git tree: linux-next
> final oops: https://syzkaller.appspot.com/x/report.txt?x=17744f07980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=13744f07980000
> kernel config: https://syzkaller.appspot.com/x/.config?x=4750ca93740b938d
> dashboard link: https://syzkaller.appspot.com/bug?extid=cee29f5a48caf10cd475
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160ce327980000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15ea7707980000
>
> Reported-by: syzbot+cee29f5a48caf10cd475@syzkaller.appspotmail.com
> Fixes: b4b3fb6c00f3 ("btrfs: canonicalize the device path before adding it")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2)
2024-10-10 4:54 ` Qu Wenruo
@ 2024-10-10 5:37 ` syzbot
0 siblings, 0 replies; 8+ messages in thread
From: syzbot @ 2024-10-10 5:37 UTC (permalink / raw)
To: clm, dsterba, eadavis, fdmanana, josef, linux-btrfs, linux-kernel,
quwenruo.btrfs, syzkaller-bugs, wqu
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+cee29f5a48caf10cd475@syzkaller.appspotmail.com
Tested-by: syzbot+cee29f5a48caf10cd475@syzkaller.appspotmail.com
Tested on:
commit: 5e61ad52 btrfs: convert btrfs_buffered_write() to use ..
git tree: https://github.com/adam900710/linux.git subpage_read
console output: https://syzkaller.appspot.com/x/log.txt?x=17f24b27980000
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.
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2024-10-10 5:37 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-10-09 13:48 [syzbot] [btrfs?] general protection fault in getname_kernel (2) syzbot
2024-10-09 23:21 ` Qu Wenruo
2024-10-10 0:29 ` syzbot
2024-10-10 2:26 ` Qu Wenruo
2024-10-10 3:02 ` syzbot
2024-10-10 4:30 ` syzbot
2024-10-10 4:54 ` Qu Wenruo
2024-10-10 5:37 ` syzbot
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