Hi Trond et al. looks like I can always reproduce the following ops with a simple cp: [10722.729463] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering... [10736.187403] ------------[ cut here ]------------ [10736.187405] Kernel BUG at 00000000f71645f7 [verbose debug info unavailable] [10736.187417] ------------[ cut here ]------------ [10736.187432] refcount_t hit zero at pnfs_layout_remove_lseg+0x46/0x90 [nfsv4] in kworker/1:0[16409], uid/euid: 0/0 [10736.187436] WARNING: CPU: 1 PID: 16409 at kernel/panic.c:657 refcount_error_report+0x94/0x9e [10736.187436] Modules linked in: nfs_layout_flexfiles rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache xt_nat veth ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_addrtype br_netfilter overlay tun rfcomm fuse ccm nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack xt_multiport ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c iptable_mangle iptable_raw iptable_security ebtable_filter ebtables ip6table_filter ip6_tables cmac binfmt_misc bnep sunrpc vfat fat arc4 snd_soc_skl snd_hda_codec_hdmi snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_dsp [10736.187463] snd_soc_sst_ipc snd_soc_acpi uvcvideo snd_soc_core videobuf2_vmalloc btusb btrtl intel_rapl btbcm btintel videobuf2_memops x86_pkg_temp_thermal intel_powerclamp videobuf2_v4l2 bluetooth snd_hda_codec_realtek videobuf2_core iwlmvm snd_hda_codec_generic coretemp videodev kvm_intel snd_compress snd_pcm_dmaengine ac97_bus mac80211 media snd_hda_intel kvm snd_hda_codec iTCO_wdt iTCO_vendor_support iwlwifi mei_wdt dell_wmi ecdh_generic wmi_bmof dell_smbios_wmi dell_laptop sparse_keymap snd_hda_core dell_wmi_descriptor ppdev dell_smbios_smm dell_smbios dcdbas snd_hwdep irqbypass crct10dif_pclmul dell_smm_hwmon crc32_pclmul snd_seq cfg80211 snd_seq_device ghash_clmulni_intel snd_pcm intel_cstate intel_uncore i2c_i801 intel_rapl_perf snd_timer joydev rtsx_pci_ms memstick snd mei_me soundcore [10736.187491] mei processor_thermal_device shpchp intel_soc_dts_iosf intel_pch_thermal wmi parport_pc parport dell_rbtn int3400_thermal acpi_thermal_rel acpi_pad int3403_thermal rfkill int340x_thermal_zone i915 rtsx_pci_sdmmc mmc_core i2c_algo_bit drm_kms_helper drm e1000e crc32c_intel serio_raw rtsx_pci ptp pps_core video [10736.187504] CPU: 1 PID: 16409 Comm: kworker/1:0 Tainted: G W 4.15.6-300.fc27.x86_64 #1 [10736.187505] Hardware name: Dell Inc. Latitude E7470/0T6HHJ, BIOS 1.6.3 06/15/2016 [10736.187518] Workqueue: nfsiod rpc_async_release [sunrpc] [10736.187520] RIP: 0010:refcount_error_report+0x94/0x9e [10736.187521] RSP: 0018:ffffa5c6d196fac0 EFLAGS: 00010282 [10736.187522] RAX: 0000000000000000 RBX: ffffffff93088273 RCX: 0000000000000006 [10736.187523] RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffff9a780dc968f0 [10736.187523] RBP: ffffa5c6d196fc08 R08: 0000000000000651 R09: 0000000000000004 [10736.187524] R10: ffffffff93206a80 R11: 0000000000000001 R12: ffff9a776fe63f80 [10736.187525] R13: 0000000000000000 R14: ffffffff930795b5 R15: 0000000000000004 [10736.187526] FS: 0000000000000000(0000) GS:ffff9a780dc80000(0000) knlGS:0000000000000000 [10736.187527] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [10736.187528] CR2: 000000000000000c CR3: 000000036120a005 CR4: 00000000003606e0 [10736.187529] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [10736.187529] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [10736.187530] Call Trace: [10736.187534] ex_handler_refcount+0x4e/0x80 [10736.187536] fixup_exception+0x33/0x40 [10736.187538] do_trap+0x83/0x140 [10736.187540] do_error_trap+0x9d/0x120 [10736.187550] ? nfs42_proc_clone+0x2c7/0x309 [nfsv4] [10736.187552] ? __update_load_avg_se.isra.30+0x1b6/0x1c0 [10736.187553] ? __update_load_avg_se.isra.30+0x1b6/0x1c0 [10736.187555] ? update_load_avg+0x558/0x6b0 [10736.187557] invalid_op+0x51/0x70 [10736.187566] RIP: 0010:pnfs_layout_remove_lseg+0x46/0x90 [nfsv4] [10736.187566] RSP: 0018:ffffa5c6d196fcb8 EFLAGS: 00010246 [10736.187567] RAX: ffff9a765cc07f28 RBX: ffff9a757fe5f000 RCX: ffff9a765cc07f00 [10736.187568] RDX: ffff9a765cc07f28 RSI: ffff9a757fe5f000 RDI: ffff9a757fe5f000 [10736.187569] RBP: ffff9a765cc07f00 R08: 0000000000000004 R09: 0fb19d5a01000000 [10736.187570] R10: ffffa5c6d196fda8 R11: ffffffffc10e3470 R12: ffff9a765cc07f01 [10736.187570] R13: ffff9a756cc2d8c0 R14: 0000000000000000 R15: ffff9a765cc07f00 [10736.187579] ? pnfs_layout_remove_lseg+0x1d/0x90 [nfsv4] [10736.187585] pnfs_lseg_dec_and_remove_zero+0x37/0x70 [nfsv4] [10736.187593] mark_lseg_invalid+0x29/0x50 [nfsv4] [10736.187600] pnfs_roc+0x1ad/0x310 [nfsv4] [10736.187606] ? nfs4_do_close+0x1c9/0x2e0 [nfsv4] [10736.187611] nfs4_do_close+0x1c9/0x2e0 [nfsv4] [10736.187620] __put_nfs_open_context+0x7c/0x100 [nfs] [10736.187627] nfs_commitdata_release+0x15/0x30 [nfs] [10736.187634] rpc_free_task+0x2d/0x70 [sunrpc] [10736.187637] process_one_work+0x175/0x390 [10736.187640] worker_thread+0x2e/0x380 [10736.187641] ? process_one_work+0x390/0x390 [10736.187644] kthread+0x113/0x130 [10736.187645] ? kthread_create_worker_on_cpu+0x70/0x70 [10736.187647] ? kthread_create_worker_on_cpu+0x70/0x70 [10736.187648] ret_from_fork+0x35/0x40 [10736.187649] Code: 48 8b 95 80 00 00 00 41 55 49 8d 8c 24 48 07 00 00 45 8b 84 24 68 05 00 00 41 89 c1 48 89 de 48 c7 c7 c0 c7 08 93 e8 4c fa ff ff <0f> 0b 58 5b 5d 41 5c 41 5d c3 0f 1f 44 00 00 55 48 89 e5 41 56 [10736.187673] ---[ end trace ae865330f8bfd4f0 ]--- [10736.187699] ------------[ cut here ]------------ [10736.187700] Kernel BUG at 00000000c11ed4b1 [verbose debug info unavailable] If I downgrade my kernel to any of 4.14 - ops is gone. The 4.16-rc4 panics as well. Let me know if you need more info or testing. Regards, Tigran -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
