general protection fault in nfsd_reply_cache_free

general protection fault in nfsd_reply_cache_free_locked
Status: upstream: reported on 2020/05/12 06:55
Reported-by: syzbot+a29df412692980277f9d@syzkaller.appspotmail.com
First crash: 96d, last: 68d

Sample crash report:

general protection fault, probably for non-canonical address 0xdffffc0000020f86: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x0000000000107c30-0x0000000000107c37]
CPU: 1 PID: 24681 Comm: kworker/u4:0 Not tainted 5.7.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x380 fs/nfsd/nfscache.c:122
Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 18 3e 2e ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 02 00 00
RSP: 0018:ffffc9001627fb70 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809e893000 RCX: dffffc0000000000
RDX: 0000000000020f86 RSI: ffffffff8245b278 RDI: 0000000000107c31
RBP: 0000000000107bd0 R08: ffff88803fee8240 R09: 0000000000000001
R10: ffffffff8c3459af R11: fffffbfff1868b35 R12: ffff888000107c18
R13: ffff888000107c20 R14: 0000000000007c18 R15: ffff888000107c18
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c21ae8ad8 CR3: 00000000a754a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 nfsd_reply_cache_shutdown+0x150/0x350 fs/nfsd/nfscache.c:203
 nfsd_exit_net+0x189/0x4c0 fs/nfsd/nfsctl.c:1504
 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186
 cleanup_net+0x511/0xa50 net/core/net_namespace.c:603
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Modules linked in:
---[ end trace c98b2581bd4d808f ]---
RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x380 fs/nfsd/nfscache.c:122
Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 18 3e 2e ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 02 00 00
RSP: 0018:ffffc9001627fb70 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809e893000 RCX: dffffc0000000000
RDX: 0000000000020f86 RSI: ffffffff8245b278 RDI: 0000000000107c31
RBP: 0000000000107bd0 R08: ffff88803fee8240 R09: 0000000000000001
R10: ffffffff8c3459af R11: fffffbfff1868b35 R12: ffff888000107c18
R13: ffff888000107c20 R14: 0000000000007c18 R15: ffff888000107c18
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000073e914 CR3: 000000008817a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-kasan-gce	2020/06/04 19:04	upstream	acf25aa6	6720fdef	.config	log	report			bfields@fieldses.org, chuck.lever@oracle.com, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/05/07 23:21	upstream	6e7f2eac	6c70a1c2	.config	log	report			bfields@fieldses.org, chuck.lever@oracle.com, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org