Hello, syzbot found the following crash on: HEAD commit: 6e7f2eac Merge tag 'arm64-fixes' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14567034100000 kernel config: https://syzkaller.appspot.com/x/.config?x=b0212dbee046bc1f dashboard link: https://syzkaller.appspot.com/bug?extid=a29df412692980277f9d compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a29df412692980277f9d@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: 27932 Comm: kworker/u4:4 Not tainted 5.7.0-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+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 08 c0 2f 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:ffffc90008bb7b70 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888000026000 RCX: dffffc0000000000 RDX: 0000000000000002 RSI: ffffffff82436ea8 RDI: 0000000000000011 RBP: ffffffffffffffb0 R08: ffff888093792400 R09: fffffbfff185cf3e R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffff888000100000 R13: ffff888000100008 R14: 0000000000000000 R15: ffff888000100000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c531000 CR3: 00000000685a2000 CR4: 00000000001426f0 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:352 Modules linked in: ---[ end trace 54f06072fc6a1afa ]--- 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 08 c0 2f 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:ffffc90008bb7b70 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888000026000 RCX: dffffc0000000000 RDX: 0000000000000002 RSI: ffffffff82436ea8 RDI: 0000000000000011 RBP: ffffffffffffffb0 R08: ffff888093792400 R09: fffffbfff185cf3e R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffff888000100000 R13: ffff888000100008 R14: 0000000000000000 R15: ffff888000100000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c531000 CR3: 0000000094cfb000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
