general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 16838 Comm: kworker/u4:10 Not tainted 5.9.0-rc3-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/0x350 fs/nfsd/nfscache.c:123
Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 c8 9d 2a 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 8b 02 00 00
RSP: 0018:ffffc90005847b60 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88804909b000 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: ffffffff8249afb8 RDI: 0000000000000011
RBP: ffffffffffffffb0 R08: 0000000000000001 R09: ffffffff8c5f59ef
R10: 0000000000000800 R11: 000000000000016e R12: ffff88800010c2e8
R13: 000000000000c2e8 R14: ffffed100002185e R15: ffff88800010c2e8
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000747698 CR3: 000000009d1ad000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 nfsd_reply_cache_shutdown+0x142/0x2c0 fs/nfsd/nfscache.c:209
 nfsd_exit_net+0x15f/0x490 fs/nfsd/nfsctl.c:1507
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186
 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603
 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 5956262a1abb6ddc ]---
RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x350 fs/nfsd/nfscache.c:123
Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 c8 9d 2a 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 8b 02 00 00
RSP: 0018:ffffc90005847b60 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88804909b000 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: ffffffff8249afb8 RDI: 0000000000000011
RBP: ffffffffffffffb0 R08: 0000000000000001 R09: ffffffff8c5f59ef
R10: 0000000000000800 R11: 000000000000016e R12: ffff88800010c2e8
R13: 000000000000c2e8 R14: ffffed100002185e R15: ffff88800010c2e8
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31f2e000 CR3: 00000000a85d9000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400