Re: general protection fault in wb_timer_fn

[Hao Sun]

Christoph Hellwig <hch@xxxxxxxxxxxxx> 于2021年9月14日周二 下午6:46写道：
>
> On Mon, Sep 13, 2021 at 10:00:27AM +0800, Hao Sun wrote:
> > Hello,
> >
> > When using Healer to fuzz the latest Linux kernel, the following crash
> > was triggered.
> >
> > HEAD commit:  4b93c544e90e-thunderbolt: test: split up test cases
> > git tree: upstream
> > console output:
> > https://drive.google.com/file/d/1naN-5p-rFgKpHrshO_kQr5f_KlhvFGGU/view?usp=sharing
> > kernel config: https://drive.google.com/file/d/1c0u2EeRDhRO-ZCxr9MP2VvAtJd6kfg-p/view?usp=sharing
> > C reproducer: https://drive.google.com/file/d/19EDhssGw_V1oO2vWOPrgQqve0TdFSgvh/view?usp=sharing
> > Syzlang reproducer:
> > https://drive.google.com/file/d/13EGCCoaMe9oitrQCfy44BkGVLbKKFP6X/view?usp=sharing
>
> All these google drive links just lead me to badly localized error
> messages.  Can you upload these to a less broken hosting platform?

console output: https://paste.ubuntu.com/p/5qHqPXWmCQ/
kernel config: https://paste.ubuntu.com/p/VsVbFh9ZpQ/
C reproducer: https://paste.ubuntu.com/p/yrYsn4zpcn/
Syzlang reproducer: https://paste.ubuntu.com/p/bCWyNyHncJ/

Just tried the C reproducer on the latest Linux kernel (6880fa6c5660
Linux 5.15-rc1).
The reproducer still crashed the kernel but with a different backtrace.

IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
Bluetooth: hci0: command 0x0409 tx timeout
------------[ cut here ]------------
kernel BUG at fs/buffer.c:1510!
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.14.0+ #15
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: events delayed_fput
RIP: 0010:block_invalidatepage+0x27f/0x2a0 -origin/fs/buffer.c:1510
Code: ff ff e8 b4 07 d7 ff b9 02 00 00 00 be 02 00 00 00 4c 89 ff 48
c7 c2 40 4e 25 84 e8 2b c2 c4 02 e9 c9 fe ff ff e8 91 07 d7 ff <0f> 0b
e8 8a 07 d7 ff 0f 0b e8 83 07 d7 ff 48 8d 5d ff e9 57 ff ff
RSP: 0018:ffffc9000065bb60 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffea0000670000 RCX: 0000000000000000
RDX: ffff8880097fa240 RSI: ffffffff81608a9f RDI: ffffea0000670000
RBP: ffffea0000670000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000065b9f8 R11: 0000000000000003 R12: ffffffff81608820
R13: ffffc9000065bc68 R14: 0000000000000000 R15: ffffc9000065bbf0
FS:  0000000000000000(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4aef93fb08 CR3: 0000000108cf2000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 do_invalidatepage -origin/mm/truncate.c:157 [inline]
 truncate_cleanup_page+0x15c/0x280 -origin/mm/truncate.c:176
 truncate_inode_pages_range+0x169/0xc30 -origin/mm/truncate.c:325
 kill_bdev.isra.29+0x28/0x30
 blkdev_flush_mapping+0x4c/0x130 -origin/block/bdev.c:658
 blkdev_put_whole+0x54/0x60 -origin/block/bdev.c:689
 blkdev_put+0x6f/0x210 -origin/block/bdev.c:953
 blkdev_close+0x25/0x30 -origin/block/fops.c:459
 __fput+0xdf/0x380 -origin/fs/file_table.c:280
 delayed_fput+0x25/0x40 -origin/fs/file_table.c:308
 process_one_work+0x359/0x850 -origin/kernel/workqueue.c:2297
 worker_thread+0x41/0x4d0 -origin/kernel/workqueue.c:2444
 kthread+0x178/0x1b0 -origin/kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 -origin/arch/x86/entry/entry_64.S:295
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 9dbb8f58f2109f10 ]---
RIP: 0010:block_invalidatepage+0x27f/0x2a0 -origin/fs/buffer.c:1510
Code: ff ff e8 b4 07 d7 ff b9 02 00 00 00 be 02 00 00 00 4c 89 ff 48
c7 c2 40 4e 25 84 e8 2b c2 c4 02 e9 c9 fe ff ff e8 91 07 d7 ff <0f> 0b
e8 8a 07 d7 ff 0f 0b e8 83 07 d7 ff 48 8d 5d ff e9 57 ff ff
RSP: 0018:ffffc9000065bb60 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffea0000670000 RCX: 0000000000000000
RDX: ffff8880097fa240 RSI: ffffffff81608a9f RDI: ffffea0000670000
RBP: ffffea0000670000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000065b9f8 R11: 0000000000000003 R12: ffffffff81608820
R13: ffffc9000065bc68 R14: 0000000000000000 R15: ffffc9000065bbf0
FS:  0000000000000000(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff98674f000 CR3: 0000000106b2e000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554