Hello, syzbot found the following issue on: HEAD commit: 231bc539 Merge branch 'for-linus' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=101f596bd00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a9e9956ca52a5f6 dashboard link: https://syzkaller.appspot.com/bug?extid=314d9a0380418b51606b 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+314d9a0380418b51606b@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 PID: 25304 Comm: kworker/u4:12 Not tainted 5.13.0-rc4-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+0x31/0x3b0 fs/nfsd/nfscache.c:123 Code: 54 49 89 fc 55 48 89 f5 53 48 89 d3 48 83 ec 08 e8 94 f5 1c 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 c3 02 00 00 RSP: 0018:ffffc90017a07b68 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888017997000 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff8257e6ec RDI: 0000000000000011 RBP: ffffffffffffffb0 R08: 0000000000000800 R09: ffffffff902278af R10: ffffffff8257f56e R11: 0000000000084087 R12: ffff888000118680 R13: 0000000000018680 R14: ffffed10000230d1 R15: ffff888000118680 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe0630ed17 CR3: 0000000017232000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nfsd_reply_cache_shutdown+0x153/0x2d0 fs/nfsd/nfscache.c:222 nfsd_exit_net+0x15f/0x490 fs/nfsd/nfsctl.c:1503 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:175 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276 worker_thread+0x64c/0x1120 kernel/workqueue.c:2422 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: ---[ end trace 0af87ae802e1324a ]--- RIP: 0010:nfsd_reply_cache_free_locked+0x31/0x3b0 fs/nfsd/nfscache.c:123 Code: 54 49 89 fc 55 48 89 f5 53 48 89 d3 48 83 ec 08 e8 94 f5 1c 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 c3 02 00 00 RSP: 0018:ffffc90017a07b68 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888017997000 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff8257e6ec RDI: 0000000000000011 RBP: ffffffffffffffb0 R08: 0000000000000800 R09: ffffffff902278af R10: ffffffff8257f56e R11: 0000000000084087 R12: ffff888000118680 R13: 0000000000018680 R14: ffffed10000230d1 R15: ffff888000118680 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005618fcbf1160 CR3: 000000001518e000 CR4: 00000000001526f0 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
