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Using the 6.6.= 83 kernel is rock solid. I confirmed this on two x86/64 machines (Intel-N15= 0 based and AMD 8845H-based). Posting here seeking debug advice. It is not = clear to me if this is something in the kernel code or in something else wi= thin the distro. >=20 > I get the following from dmesg: > Kernel BUG at nfsd4_probe_callback_sync+0x1094/0x25b0 [nfsd] [verbose deb= ug info unavailable] > Oops: invalid opcode: 0000 [#1] SMP NOPTI > CPU: 2 UID: 0 PID: 17091 Comm: rpc.nfsd Not tainted 6.12.19 #0 > Hardware name: iKOOLCORE R2Max/R2Max, BIOS v1.1 12/17/2024 > RIP: 0010:nfsd4_probe_callback_sync+0x1094/0x25b0 [nfsd] > Code: 89 de 48 c7 c7 e0 20 95 a0 e8 08 fc ff ff 41 89 c4 85 c0 0f 85 ce 2= d 00 00 48 c7 c7 58 dd 95 a0 45 31 e4 e8 8e 7a 0b e1 eb 08 <0f> 0b 41 bc f4= ff ff ff 48 83 c4 08 44 89 e0 5b 41 5c 41 5d 41 5e > RSP: 0018:ffffc9000613bc98 EFLAGS: 00010282 > RAX: 0000000000000049 RBX: ffff888105e06000 RCX: 0000000000000000 > RDX: ffff88846fb21920 RSI: ffff88846fb1d980 RDI: ffff88846fb1d980 > RBP: ffffc9000613bcc0 R08: 0000000000000000 R09: ffffffff824b56c8 > R10: ffffffff8249d688 R11: 0000000000000003 R12: ffffffff82736400 > R13: ffff888105e06000 R14: ffff888105e06000 R15: ffffc9000613bcd0 > FS: 00007f1a404e5b28(0000) GS:ffff88846fb00000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f1a40411000 CR3: 000000010d47a006 CR4: 0000000000370ef0 > Call Trace: > > ? show_regs.part.0+0x1d/0x20 > ? __die+0x52/0x91 > ? die+0x2a/0x50 > ? do_trap+0x103/0x110 > ? do_error_trap+0x6c/0x90 > ? nfsd4_probe_callback_sync+0x1094/0x25b0 [nfsd] > ? exc_invalid_op+0x4f/0x70 > ? nfsd4_probe_callback_sync+0x1094/0x25b0 [nfsd] > ? asm_exc_invalid_op+0x1b/0x20 > ? nfsd4_probe_callback_sync+0x1094/0x25b0 [nfsd] > ? nfsd4_probe_callback_sync+0xff6/0x25b0 [nfsd] > nfsd4_client_tracking_init+0x39/0x150 [nfsd] > nfs4_state_start_net+0x2ce/0x370 [nfsd] > nfsd_svc+0x1a0/0x2d0 [nfsd] > nfssvc_encode_voidres+0x19a1/0x1be0 [nfsd] > ? simple_transaction_get+0xb7/0xe0 > ? nfssvc_encode_voidres+0x18f0/0x1be0 [nfsd] > nfssvc_encode_voidres+0x1a3/0x1be0 [nfsd] > vfs_write+0xcb/0x390 > ? putname+0x4c/0x60 > ksys_write+0x57/0xd0 > __x64_sys_write+0x14/0x20 > x64_sys_call+0x79/0x1780 > do_syscall_64+0x7b/0x190 > entry_SYSCALL_64_after_hwframe+0x67/0x6f > RIP: 0033:0x7f1a404c9659 > Code: c3 8b 07 85 c0 75 24 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4= d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 e9 82 d8 ff= ff 41 54 b8 02 00 00 00 55 48 89 f5 be 00 88 08 00 > RSP: 002b:00007fff99aeb2c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f1a404c9659 > RDX: 0000000000000003 RSI: 000000000040d360 RDI: 0000000000000003 > RBP: 00007f1a404e5b28 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 > R13: 0000000000020000 R14: 0000000000409112 R15: 00007f1a40430dd0 > > Modules linked in: xt_connlimit pppoe ppp_async nf_conncount i915 xt_stat= e xt_helper xt_conntrack xt_connmark xt_connlabel xt_connbytes xt_CT wiregu= ard video pppox ppp_mppe ppp_generic nft_redir nft_nat nft_masq nft_flow_of= fload nft_fib_inet nft_ct nft_chain_nat nf_nat nf_flow_table_inet nf_flow_t= able nf_conntrack_netlink nf_conntrack libchacha20poly1305 ipt_REJECT iavf = i40e curve25519_x86_64 chacha_x86_64 cdc_ncm cdc_ether aqc111 zstd xt_time = xt_tcpudp xt_tcpmss xt_statistic xt_recent xt_quota xt_pkttype xt_owner xt_= multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_ecn xt_dscp xt_comment= xt_cgroup xt_addrtype xt_TCPMSS xt_LOG xt_HL xt_DSCP xt_CLASSIFY xt_CHECKS= UM wmi usbnet unix_diag ts_kmp ts_fsm ts_bm slhc sch_cake poly1305_x86_64 n= ft_reject_ipv6 nft_reject_ipv4 nft_reject_inet nft_reject nft_quota nft_que= ue nft_numgen nft_log nft_limit nft_hash nft_fib_ipv6 nft_fib_ipv4 nft_fib = nft_compat nfnetlink_queue nf_tables nf_reject_ipv4 nf_log_syslog nf_defrag= _ipv6 nf_defrag_ipv4 macvlan lzo_rle lzo libie > libeth libcurve25519_generic libchacha iptable_mangle iptable_filter ipt= _ECN ip_tables forcedeth e1000e drm_display_helper drm_buddy crc_ccitt cdc_= acm bnx2 atlantic af_packet_diag sch_teql sch_sfq sch_multiq sch_gred sch_f= q sch_ets sch_codel em_text em_nbyte em_meta em_cmp act_skbmod act_simple a= ct_pedit act_csum sch_tbf sch_ingress sch_htb sch_hfsc em_u32 cls_u32 cls_r= oute cls_matchall cls_fw cls_flow cls_basic act_skbedit act_mirred act_gact= configs evdev drivetemp i2c_piix4 i2c_smbus i2c_dev xt_set ip_set_list_set= ip_set_hash_netportnet ip_set_hash_netport ip_set_hash_netnet ip_set_hash_= netiface ip_set_hash_net ip_set_hash_mac ip_set_hash_ipportnet ip_set_hash_= ipportip ip_set_hash_ipport ip_set_hash_ipmark ip_set_hash_ipmac ip_set_has= h_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetli= nk dwmac_intel ip6t_rt ip6t_mh ip6t_ipv6header ip6t_hbh ip6t_frag ip6t_eui6= 4 ip6t_ah ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables n= f_reject_ipv6 nfsv4 dwmac_generic > stmmac_platform stmmac nfsd nfs bonding ixgbe igbvf e1000 amd_xgbe ifb s= ctp udp_tunnel ip6_udp_tunnel mdio netlink_diag udp_diag tcp_diag raw_diag = inet_diag rpcsec_gss_krb5 auth_rpcgss oid_registry veth lockd sunrpc grace = dns_resolver nls_utf8 pcs_xpcs macsec ena ecdh_generic ecc xxhash_generic c= rypto_user algif_skcipher algif_rng algif_hash algif_aead af_alg sha512_sss= e3 sha512_generic sha1_ssse3 sha1_generic seqiv sha3_generic jitterentropy_= rng drbg md5 kpp hmac geniv rng des_generic libdes cts chacha20poly1305 bla= ke2b_generic authencesn authenc arc4 crypto_acompress nls_iso8859_1 nls_cp4= 37 r8169 mdio_devres xhci_plat_hcd iTCO_wdt iTCO_vendor_support fsl_mph_dr_= of ehci_platform ehci_fsl igb igc vfat fat btrfs zstd_decompress zstd_compr= ess zstd_common xxhash xor raid6_pq lzo_decompress lzo_compress libcrc32c d= m_mirror dm_region_hash dm_log dm_crypt dm_mod dax tg3 realtek phylink mii = libphy tpm cbc sha256_ssse3 sha256_generic encrypted_keys trusted > ---[ end trace 0000000000000000 ]--- > RIP: 0010:nfsd4_probe_callback_sync+0x1094/0x25b0 [nfsd] > Code: 89 de 48 c7 c7 e0 20 95 a0 e8 08 fc ff ff 41 89 c4 85 c0 0f 85 ce 2= d 00 00 48 c7 c7 58 dd 95 a0 45 31 e4 e8 8e 7a 0b e1 eb 08 <0f> 0b 41 bc f4= ff ff ff 48 83 c4 08 44 89 e0 5b 41 5c 41 5d 41 5e > RSP: 0018:ffffc9000613bc98 EFLAGS: 00010282 > RAX: 0000000000000049 RBX: ffff888105e06000 RCX: 0000000000000000 > RDX: ffff88846fb21920 RSI: ffff88846fb1d980 RDI: ffff88846fb1d980 > RBP: ffffc9000613bcc0 R08: 0000000000000000 R09: ffffffff824b56c8 > R10: ffffffff8249d688 R11: 0000000000000003 R12: ffffffff82736400 > R13: ffff888105e06000 R14: ffff888105e06000 R15: ffffc9000613bcd0 > FS: 00007f1a404e5b28(0000) GS:ffff88846fb00000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f1a40411000 CR3: 000000010d47a006 CR4: 0000000000370ef0 >=20 > Here is /etc/exports: > /mnt/data/nfs 10.9.8.0/24(ro,fsid=3Droot,no_subtree_check,insecure= ,async,all_squash,pnfs,anonuid=3D99,anongid=3D99) > /mnt/data/nfs/misc 10.9.8.0/24(ro,no_subtree_check,insecure,async,all_s= quash,pnfs,anonuid=3D99,anongid=3D99) >=20 >=20 I recommend bisecting between 6.6 and 6.12.19 to locate the culprit. When you have that information, open a bug on bugzilla.kernel.org under Filesystems/NFSD and attach your information there. --=20 Chuck Lever