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Subjectgeneral protection fault in cache_clean
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Hello,

syzbot found the following issue on:

HEAD commit: 581cb3a2 Merge tag 'f2fs-for-5.9-rc5' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11f5c011900000
kernel config: https://syzkaller.appspot.com/x/.config?x=a9075b36a6ae26c9
dashboard link: https://syzkaller.appspot.com/bug?extid=1594adb1b44e354153d8
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1594adb1b44e354153d8@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0012e34a9a: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x00000000971a54d0-0x00000000971a54d7]
CPU: 1 PID: 19990 Comm: kworker/1:11 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient do_cache_clean
RIP: 0010:cache_clean+0x119/0x7f0 net/sunrpc/cache.c:444
Code: 81 fb 20 eb 94 8a 0f 84 b8 00 00 00 e8 80 df 33 fa 48 8d 83 40 ff ff ff 48 8d 7b 10 48 89 05 8e 8e 13 06 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 e0 05 00 00 48 8d 6c 24 38 4c 8b 63 10 48 89
RSP: 0018:ffffc90008e1fc48 EFLAGS: 00010206
RAX: 0000000012e34a9a RBX: 00000000971a54c0 RCX: ffffffff87406dbb
RDX: ffff88804358a000 RSI: ffffffff87406e00 RDI: 00000000971a54d0
RBP: 0000000000000100 R08: 0000000000000001 R09: 0000000000000003
R10: 0000000000000100 R11: 0000000000000000 R12: 0000000000000100
R13: dffffc0000000000 R14: ffff88803451b200 R15: ffff8880ae735600
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004ef310 CR3: 000000009ca1b000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_cache_clean+0xd/0xd0 net/sunrpc/cache.c:502
process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
---[ end trace 4c54bbd0e20d734b ]---
RIP: 0010:cache_clean+0x119/0x7f0 net/sunrpc/cache.c:444
Code: 81 fb 20 eb 94 8a 0f 84 b8 00 00 00 e8 80 df 33 fa 48 8d 83 40 ff ff ff 48 8d 7b 10 48 89 05 8e 8e 13 06 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 e0 05 00 00 48 8d 6c 24 38 4c 8b 63 10 48 89
RSP: 0018:ffffc90008e1fc48 EFLAGS: 00010206
RAX: 0000000012e34a9a RBX: 00000000971a54c0 RCX: ffffffff87406dbb
RDX: ffff88804358a000 RSI: ffffffff87406e00 RDI: 00000000971a54d0
RBP: 0000000000000100 R08: 0000000000000001 R09: 0000000000000003
R10: 0000000000000100 R11: 0000000000000000 R12: 0000000000000100
R13: dffffc0000000000 R14: ffff88803451b200 R15: ffff8880ae735600
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004ef310 CR3: 000000009ca1b000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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.

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