This isn't the first report: https://syzkaller.appspot.com/bug?extid=a29df412692980277f9d but I'm not managing yet to see why it happens.... --b. On Sun, Jun 06, 2021 at 10:42:26PM -0700, syzbot wrote: > 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.
