I just hit a similar issue in 5.0.5. This time instead of an oops it was a general protection fault, but gss_verify_mic_kerberos is still implicated. I've updated the existing Fedora bug (https://bugzilla.redhat.com/show_bug.cgi?id=1690123) and included the kernel log output below, but I'm not sure what else I can do at this point. It's rare but when it hits all activity on the mount will hang which makes the machine basically useless until a reboot. general protection fault: 0000 [#1] SMP PTI CPU: 2 PID: 23494 Comm: MATLAB Not tainted 5.0.5-200.fc29.x86_64 #1 Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z170 Gaming-ITX/ac, BIOS P2.10 04/13/2016 RIP: 0010:gss_verify_mic_kerberos+0x73/0x300 [rpcsec_gss_krb5] Code: 00 0f 84 a7 02 00 00 48 8d 44 24 34 4c 8b 62 08 c7 44 24 20 14 00 00 00 48 89 44 24 28 f6 05 7f 07> RSP: 0018:ffffa123c821b738 EFLAGS: 00010246 RAX: ffffa123c821b76c RBX: ffff8dee49bfb800 RCX: 0000000000000012 RDX: ffffa123c821b7b0 RSI: ffffa123c821b7c0 RDI: ffff8deed94f0730 RBP: ffffa123c821b7c0 R08: 00000000000002f4 R09: ffff8dec806c5b40 R10: ffff8decf0198f98 R11: 00000000e22f0760 R12: b3ee8b75a91dc700 R13: 0000000000000000 R14: 0000000000004f64 R15: ffff8def389f6c00 FS: 00007fcce5cf3700(0000) GS:ffff8def55f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00001de264a1b000 CR3: 000000050d684001 CR4: 00000000003606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: gss_unwrap_resp_integ.isra.12+0xa6/0xf0 [auth_rpcgss] ? nfs4_xdr_dec_layoutget+0xa0/0xa0 [nfsv4] gss_unwrap_resp+0x1c4/0x230 [auth_rpcgss] ? gss_validate+0x1b4/0x200 [auth_rpcgss] ? nfs4_xdr_dec_layoutget+0xa0/0xa0 [nfsv4] rpcauth_unwrap_resp+0x67/0xc0 [sunrpc] ? nfs4_xdr_dec_layoutget+0xa0/0xa0 [nfsv4] call_decode+0x260/0x500 [sunrpc] ? trace_event_raw_event_rpc_stats_latency+0x240/0x240 [sunrpc] ? call_refreshresult+0xd0/0xd0 [sunrpc] __rpc_execute+0x7f/0x350 [sunrpc] ? recalibrate_cpu_khz+0x10/0x10 ? ktime_get+0x36/0xa0 rpc_run_task+0xfc/0x130 [sunrpc] nfs4_call_sync_sequence+0x64/0xa0 [nfsv4] _nfs4_proc_readdir+0x208/0x280 [nfsv4] nfs4_proc_readdir+0x86/0x120 [nfsv4] ? nfs4_proc_symlink+0x1e0/0x1e0 [nfsv4] nfs_readdir_xdr_to_array+0x17a/0x3f0 [nfs] ? xas_store+0x4b/0x540 ? mem_cgroup_commit_charge+0x82/0x150 ? __add_to_page_cache_locked+0x336/0x3e0 nfs_readdir_filler+0x1b/0x90 [nfs] do_read_cache_page+0x371/0x7e0 ? nfs_readdir_xdr_to_array+0x3f0/0x3f0 [nfs] ? nfs4_do_check_delegation+0x18/0x40 [nfsv4] ? nfs_check_cache_invalid+0x33/0x90 [nfs] nfs_readdir+0x137/0x510 [nfs] ? nfs4_xdr_dec_allocate+0xd0/0xd0 [nfsv4] iterate_dir+0x91/0x190 ksys_getdents64+0x9c/0x130 ? iterate_dir+0x190/0x190 __x64_sys_getdents64+0x16/0x20 do_syscall_64+0x5b/0x160 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fcdc17b8dfb Code: 00 00 48 83 c4 08 5b 5d c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b 47 20 c3 0f 1f 80 00 00 00 00 f3 0f> RSP: 002b:00007fcce5cf2128 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fcd28115eb0 RCX: 00007fcdc17b8dfb RDX: 0000000000008000 RSI: 00007fcd28115ee0 RDI: 0000000000000319 RBP: 00007fcd28115ee0 R08: 0000000000000000 R09: 0000000000000005 R10: 0000000000000038 R11: 0000000000000246 R12: ffffffffffffff40 R13: 0000000000000002 R14: 00000000018f99f8 R15: 00007fcce5cf2220 Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs lockd grace fscache ip6t_rpfilter ip6t_REJECT > ---[ end trace 7ae22b160d893b2f ]--- RIP: 0010:gss_verify_mic_kerberos+0x73/0x300 [rpcsec_gss_krb5] Code: 00 0f 84 a7 02 00 00 48 8d 44 24 34 4c 8b 62 08 c7 44 24 20 14 00 00 00 48 89 44 24 28 f6 05 7f 07> RSP: 0018:ffffa123c821b738 EFLAGS: 00010246 RAX: ffffa123c821b76c RBX: ffff8dee49bfb800 RCX: 0000000000000012 RDX: ffffa123c821b7b0 RSI: ffffa123c821b7c0 RDI: ffff8deed94f0730 RBP: ffffa123c821b7c0 R08: 00000000000002f4 R09: ffff8dec806c5b40 R10: ffff8decf0198f98 R11: 00000000e22f0760 R12: b3ee8b75a91dc700 R13: 0000000000000000 R14: 0000000000004f64 R15: ffff8def389f6c00 FS: 00007fcce5cf3700(0000) GS:ffff8def55f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00001de264a1b000 CR3: 000000050d684001 CR4: 00000000003606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
