[moderation] [netfs?] general protection fault in netfs_prepare_write
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syzbot
6:04 AM (9 hours ago) 6:04 AM
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 075b74841bd0 Linux 7.2-rc6
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12492649580000
kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=d4c6ec1e452ec783f0d3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
CC: [dhow...@redhat.com linux-...@vger.kernel.org linux-...@vger.kernel.org ne...@lists.linux.dev p...@manguebit.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-075b7484.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6a52a5134acd/vmlinux-075b7484.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b2138b843772/bzImage-075b7484.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d4c6ec...@syzkaller.appspotmail.com
RBP: 00007f53f44f2090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f53f3826038 R14: 00007f53f3825fa0 R15: 00007ffd9bfe8de8
</TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af]
CPU: 3 UID: 0 PID: 12055 Comm: syz.3.1870 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173
Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00
RSP: 0018:ffffc900066bfb40 EFLAGS: 00010203
RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015
RDX: dffffc0000000000 RSI: ffffffff82cb3d59 RDI: 00000000000000ad
RBP: ffff88802330f560 R08: 00000000ffffffff R09: fffffbfff1dbdcde
R10: ffffffff8edee6f3 R11: 0000000000000000 R12: ffff88802330f480
R13: ffff88802330f638 R14: 0000000000000000 R15: ffff88802330f5b2
FS: 00007f53f44f26c0(0000) GS:ffff8880d60d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efea07eb700 CR3: 0000000048253000 CR4: 0000000000352ef0
DR0: 0000000000000001 DR1: 0000000000000005 DR2: 0000000020040004
DR3: 0000000000000002 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
netfs_unbuffered_write+0x75c/0x2020 fs/netfs/direct_write.c:111
netfs_unbuffered_write_iter_locked+0x7d6/0xa80 fs/netfs/direct_write.c:290
netfs_unbuffered_write_iter+0x442/0x720 fs/netfs/direct_write.c:382
v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:409
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53f359e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f53f44f2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f53f3825fa0 RCX: 00007f53f359e019
RDX: 0000000000000012 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007f53f44f2090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f53f3826038 R14: 00007f53f3825fa0 R15: 00007ffd9bfe8de8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173
Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00
RSP: 0018:ffffc900066bfb40 EFLAGS: 00010203
RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015
RDX: dffffc0000000000 RSI: ffffffff82cb3d59 RDI: 00000000000000ad
RBP: ffff88802330f560 R08: 00000000ffffffff R09: fffffbfff1dbdcde
R10: ffffffff8edee6f3 R11: 0000000000000000 R12: ffff88802330f480
R13: ffff88802330f638 R14: 0000000000000000 R15: ffff88802330f5b2
FS: 00007f53f44f26c0(0000) GS:ffff8880d60d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efea155da08 CR3: 0000000048253000 CR4: 0000000000352ef0
DR0: 0000000000000001 DR1: 0000000000000005 DR2: 0000000020040004
DR3: 0000000000000002 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e1 07 loope 0x9
2: 38 ca cmp %cl,%dl
4: 7f 08 jg 0xe
6: 84 d2 test %dl,%dl
8: 0f 85 04 06 00 00 jne 0x612
e: 48 8d bb ad 00 00 00 lea 0xad(%rbx),%rdi
15: 0f b6 45 52 movzbl 0x52(%rbp),%eax
19: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
20: fc ff df
23: 48 89 f9 mov %rdi,%rcx
26: 48 c1 e9 03 shr $0x3,%rcx
* 2a: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx <-- trapping instruction
2e: 48 89 f9 mov %rdi,%rcx
31: 83 e1 07 and $0x7,%ecx
34: 38 ca cmp %cl,%dl
36: 7f 08 jg 0x40
38: 84 d2 test %dl,%dl
3a: 0f 85 c1 05 00 00 jne 0x601
---
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: 075b74841bd0 Linux 7.2-rc6
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12492649580000
kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=d4c6ec1e452ec783f0d3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
CC: [dhow...@redhat.com linux-...@vger.kernel.org linux-...@vger.kernel.org ne...@lists.linux.dev p...@manguebit.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-075b7484.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6a52a5134acd/vmlinux-075b7484.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b2138b843772/bzImage-075b7484.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d4c6ec...@syzkaller.appspotmail.com
RBP: 00007f53f44f2090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f53f3826038 R14: 00007f53f3825fa0 R15: 00007ffd9bfe8de8
</TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af]
CPU: 3 UID: 0 PID: 12055 Comm: syz.3.1870 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173
Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00
RSP: 0018:ffffc900066bfb40 EFLAGS: 00010203
RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015
RDX: dffffc0000000000 RSI: ffffffff82cb3d59 RDI: 00000000000000ad
RBP: ffff88802330f560 R08: 00000000ffffffff R09: fffffbfff1dbdcde
R10: ffffffff8edee6f3 R11: 0000000000000000 R12: ffff88802330f480
R13: ffff88802330f638 R14: 0000000000000000 R15: ffff88802330f5b2
FS: 00007f53f44f26c0(0000) GS:ffff8880d60d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efea07eb700 CR3: 0000000048253000 CR4: 0000000000352ef0
DR0: 0000000000000001 DR1: 0000000000000005 DR2: 0000000020040004
DR3: 0000000000000002 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
netfs_unbuffered_write+0x75c/0x2020 fs/netfs/direct_write.c:111
netfs_unbuffered_write_iter_locked+0x7d6/0xa80 fs/netfs/direct_write.c:290
netfs_unbuffered_write_iter+0x442/0x720 fs/netfs/direct_write.c:382
v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:409
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53f359e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f53f44f2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f53f3825fa0 RCX: 00007f53f359e019
RDX: 0000000000000012 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007f53f44f2090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f53f3826038 R14: 00007f53f3825fa0 R15: 00007ffd9bfe8de8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173
Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00
RSP: 0018:ffffc900066bfb40 EFLAGS: 00010203
RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015
RDX: dffffc0000000000 RSI: ffffffff82cb3d59 RDI: 00000000000000ad
RBP: ffff88802330f560 R08: 00000000ffffffff R09: fffffbfff1dbdcde
R10: ffffffff8edee6f3 R11: 0000000000000000 R12: ffff88802330f480
R13: ffff88802330f638 R14: 0000000000000000 R15: ffff88802330f5b2
FS: 00007f53f44f26c0(0000) GS:ffff8880d60d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efea155da08 CR3: 0000000048253000 CR4: 0000000000352ef0
DR0: 0000000000000001 DR1: 0000000000000005 DR2: 0000000020040004
DR3: 0000000000000002 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e1 07 loope 0x9
2: 38 ca cmp %cl,%dl
4: 7f 08 jg 0xe
6: 84 d2 test %dl,%dl
8: 0f 85 04 06 00 00 jne 0x612
e: 48 8d bb ad 00 00 00 lea 0xad(%rbx),%rdi
15: 0f b6 45 52 movzbl 0x52(%rbp),%eax
19: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
20: fc ff df
23: 48 89 f9 mov %rdi,%rcx
26: 48 c1 e9 03 shr $0x3,%rcx
* 2a: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx <-- trapping instruction
2e: 48 89 f9 mov %rdi,%rcx
31: 83 e1 07 and $0x7,%ecx
34: 38 ca cmp %cl,%dl
36: 7f 08 jg 0x40
38: 84 d2 test %dl,%dl
3a: 0f 85 c1 05 00 00 jne 0x601
---
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
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