Hi Klemens- On May 13, 2014, at 12:48 PM, Klemens Senn <klemens.senn@xxxxxxxxx> wrote: > Hi Anna, > > today I retried unloading the kernel modules with your updated kernel > and additionally I tried the nfsd-next kernel from J. Bruce Fields and > Chuck's nfs-rdma-client kernel. I filed https://bugzilla.linux-nfs.org/show_bug.cgi?id=252 to track this issue. > In short: None of these was able to unload the kernel modules with an > active connection. > > In detail: > > With your kernel I got following 3 faults: > o BUG: soft lockup - CPU#0 stuck for 22s! [modprobe:4615] > o BUG: unable to handle kernel NULL pointer dereference at > 0000000000000003 > o BUG: unable to handle kernel paging request at 0000000000005b8c > > With the nfsd-next kernel I got following results: > o BUG: soft lockup - CPU#0 stuck for 23s! [modprobe:4452] > o module unloading blocks forever, dmesg shows: > nfsd: last server has exited, flushing export cache > waiting module removal not supported: please upgrade > o Kernel keeps running but reports the following: > nfsd: last server has exited, flushing export cache > waiting module removal not supported: please upgrade > svc_xprt_enqueue: threads and transports both waiting?? > INFO: task modprobe:4510 blocked for more than 480 seconds. > Not tainted 3.15.0-rc1-bfields-master+ #1 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this > message. > modprobe D ffff88087fc13440 0 4510 4458 0x00000000 > ffff88105bb23c58 0000000000000086 ffff88105c14e690 0000000000013440 > ffff88105bb23fd8 0000000000013440 ffffffff81a14480 ffff88105c14e690 > 0000000000000037 ffff88085d7f74d8 ffff88085d7f74e0 7fffffffffffffff > Call Trace: > [<ffffffff815a2424>] schedule+0x24/0x70 > [<ffffffff815a18cc>] schedule_timeout+0x1ec/0x260 > [<ffffffff8159a504>] ? printk+0x5c/0x5e > [<ffffffff815a3406>] wait_for_completion+0x96/0x100 > [<ffffffff81080c90>] ? try_to_wake_up+0x2b0/0x2b0 > [<ffffffffa0314039>] cma_remove_one+0x1a9/0x220 [rdma_cm] > [<ffffffffa01fea86>] ib_unregister_device+0x46/0x120 [ib_core] > [<ffffffffa02c5dc9>] mlx4_ib_remove+0x29/0x260 [mlx4_ib] > [<ffffffffa04319d0>] mlx4_remove_device+0xa0/0xc0 [mlx4_core] > [<ffffffffa0431a2b>] mlx4_unregister_interface+0x3b/0xa0 [mlx4_core] > [<ffffffffa02d74cc>] mlx4_ib_cleanup+0x10/0x23 [mlx4_ib] > [<ffffffff810bd612>] SyS_delete_module+0x152/0x220 > [<ffffffff81149684>] ? vm_munmap+0x54/0x70 > [<ffffffff815ad5a6>] system_call_fastpath+0x1a/0x1f > > With the nfs-rdma-client I got following results: > o module unloading blocks forever, dmesg shows: > nfsd: last server has exited, flushing export cache > svc_xprt_enqueue: threads and transports both waiting?? > o BUG: unable to handle kernel paging request at 0000000000004dec > IP: [<ffffffff815a63b5>] _raw_spin_lock_bh+0x15/0x40 > PGD 107ba9a067 PUD 105c093067 PMD 0 > Oops: 0002 [#1] SMP > Modules linked in: nfsd nfs_acl auth_rpcgss oid_registry svcrdma > dm_mod cpuid nfs fscache lockd sunrpc af_packet 8021q garp stp llc > rdma_ucm ib_ucm rdma_cm iw_cm ib_ipoib ib_cm ib_uverbs ib_umad mlx4_en > mlx4_ib(-) ib_sa ib_mad ib_core ib_addr sr_mod cdrom usb_storage joydev > mlx4_core usbhid x86_pkg_temp_thermal coretemp kvm_intel kvm > ghash_clmulni_intel aesni_intel ablk_helper cryptd lrw gf128mul > glue_helper ehci_pci aes_x86_64 ehci_hcd isci iTCO_wdt libsas pcspkr > iTCO_vendor_support igb i2c_algo_bit sb_edac lpc_ich edac_core ioatdma > usbcore tpm_tis ptp microcode i2c_i801 sg mfd_core scsi_transport_sas > ipmi_si usb_common tpm wmi pps_core dca ipmi_msghandler acpi_cpufreq > button edd autofs4 xfs libcrc32c crc32c_intel processor thermal_sys > scsi_dh_rdac scsi_dh_hp_sw scsi_dh_emc scsi_dh_alua scsi_dh > CPU: 14 PID: 4813 Comm: modprobe Not tainted > 3.15.0-rc5-cel-nfs-rdma-client-unpatched+ #2 > Hardware name: Supermicro B9DRG-E/B9DRG-E, BIOS 3.0 09/04/2013 > task: ffff88085bf96190 ti: ffff88085d42a000 task.ti: ffff88085d42a000 > RIP: 0010:[<ffffffff815a63b5>] [<ffffffff815a63b5>] > _raw_spin_lock_bh+0x15/0x40 > RSP: 0018:ffff88085d42bd18 EFLAGS: 00010286 > RAX: 0000000000010000 RBX: 0000000000004de8 RCX: 0000000000000000 > RDX: 000000000000000b RSI: 000000000000000e RDI: 0000000000004dec > RBP: ffff88085d42bd18 R08: ffff88087c611f38 R09: 000000000000a140 > R10: 000000000000002b R11: 0000000000000000 R12: ffff88085dcc3c00 > R13: ffff88105ca13280 R14: 0000000000004dec R15: 0000000000004df0 > FS: 00007f0e49fb5700(0000) GS:ffff88107fcc0000(0000) > knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000004dec CR3: 000000105b027000 CR4: 00000000000407e0 > Stack: > ffff88085d42bd58 ffffffffa03bd9f0 0000000001328b88 ffff88085dcc3c00 > ffff88085dce8000 ffff88105ca13280 ffff88085dce8260 ffff88085dce81c8 > ffff88085d42bd78 ffffffffa0441ce9 ffff88085dce8000 ffff88105ca13240 > Call Trace: > [<ffffffffa03bd9f0>] svc_xprt_enqueue+0x50/0x220 [sunrpc] > [<ffffffffa0441ce9>] rdma_cma_handler+0x69/0x180 [svcrdma] > [<ffffffffa031a086>] cma_remove_one+0x1f6/0x220 [rdma_cm] > [<ffffffffa0261a86>] ib_unregister_device+0x46/0x120 [ib_core] > [<ffffffffa02b9dc9>] mlx4_ib_remove+0x29/0x260 [mlx4_ib] > [<ffffffffa02329d0>] mlx4_remove_device+0xa0/0xc0 [mlx4_core] > [<ffffffffa0232a2b>] mlx4_unregister_interface+0x3b/0xa0 [mlx4_core] > [<ffffffffa02cb4cc>] mlx4_ib_cleanup+0x10/0x23 [mlx4_ib] > [<ffffffff810bd6f0>] SyS_delete_module+0x170/0x1f0 > [<ffffffff811497f4>] ? vm_munmap+0x54/0x70 > [<ffffffff815ae426>] system_call_fastpath+0x1a/0x1f > Code: 5d c3 0f b7 17 66 39 ca 74 f6 f3 90 0f b7 17 66 39 d1 75 f6 5d > c3 55 65 81 04 25 20 b9 00 00 00 02 00 00 48 89 e5 b8 00 00 01 00 <f0> > 0f c1 07 89 c2 c1 ea 10 66 39 c2 75 04 5d c3 f3 90 0f b7 07 > RIP [<ffffffff815a63b5>] _raw_spin_lock_bh+0x15/0x40 > RSP <ffff88085d42bd18> > CR2: 0000000000004dec > ---[ end trace bf1fd548a33cbfc4 ]--- > Kernel panic - not syncing: Fatal exception in interrupt > Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: > 0xffffffff80000000-0xffffffff9fffffff) > ---[ end Kernel panic - not syncing: Fatal exception in interrupt > > > Regards, > Klemens > > > On 05/08/2014 05:59 PM, Anna Schumaker wrote: >> I haven't applied Chuck's recent (v3) patches to that kernel yet (I've been waiting to see if people have comments). I'll try to push something out today. >> >> On 05/08/2014 10:28 AM, Senn Klemens wrote: >>> Hi, >>> >>> I am getting a soft lockup on the NFS server on its reboot if at least >>> one client mount is established. I am using OpenSUSE 12.3 with the >>> nfs-rdma kernel from Anna Schumaker >>> (git://git.linux-nfs.org/projects/anna/nfs-rdma.git). >>> >>> The export on the server side is done with >>> /data *(fsid=0,crossmnt,rw,mp,no_root_squash,sync,no_subtree_check,insecure) >>> >>> Following command is used for mounting the NFSv4 share: >>> mount -t nfs -o port=20049,rdma,vers=4.0,timeo=900 172.16.100.19:/ /mnt >>> >>> The HCA is a Mellanox MT4099 on the server and the client. >>> >>> The soft lockup can be reproduced by following steps: >>> o server: Start the nfs server >>> o client: Mount the share >>> o client: Do a "ls" in the mounted directory >>> o server: Stop the nfs server >>> o server: Unload the nfs and mlx4 modules or reboot the server (I used >>> the openibd init script from the Mellanox driver without having the >>> Mellanox stack installed) >>> >>> The server reports a soft lockup >>> BUG: soft lockup - CPU#0 stuck for 22s! [modprobe:6146] >>> most times. >>> >>> Sometimes I get following kernel panic >>> BUG: unable to handle kernel NULL pointer dereference at 0000000000000003 >>> IP: [<ffffffff815a5c35>] _raw_spin_lock_bh+0x15/0x40 >>> PGD 82a820067 PUD 857832067 PMD 0 >>> Oops: 0002 [#1] SMP >>> Modules linked in: nfsd nfs_acl auth_rpcgss oid_registry nfnetlink_log >>> nfnetlink bluetooth rfkill nfsv4 svcrdma dm_mod cpuid nfs fscache lockd >>> sunrpc af_packet 8021q garp stp llc rdma_ucm ib_ucm rdma_cm iw_cm >>> ib_ipoib ib_cm ib_uverbs ib_umad mlx4_en mlx4_ib(-) ib_sa ib_mad ib_core >>> ib_addr sr_mod cdrom usb_storage joydev mlx4_core usbhid >>> x86_pkg_temp_thermal coretemp kvm_intel kvm ghash_clmulni_intel >>> aesni_intel ablk_helper cryptd iTCO_wdt lrw igb gf128mul >>> iTCO_vendor_support ehci_pci glue_helper pcspkr i2c_algo_bit isci >>> ehci_hcd aes_x86_64 ptp libsas ioatdma lpc_ich microcode sb_edac sg >>> pps_core usbcore ipmi_si tpm_tis edac_core scsi_transport_sas i2c_i801 >>> mfd_core dca usb_common tpm ipmi_msghandler wmi acpi_cpufreq button edd >>> autofs4 xfs libcrc32c crc32c_intel processor thermal_sys scsi_dh_rdac >>> scsi_dh_hp_sw scsi_dh_emc scsi_dh_alua scsi_dh [last unloaded: oid_registry] >>> CPU: 0 PID: 6603 Comm: modprobe Not tainted 3.15.0-rc2-anna-nfs-rdma+ #3 >>> Hardware name: Supermicro B9DRG-E/B9DRG-E, BIOS 3.0 09/04/2013 >>> task: ffff88105b8c6050 ti: ffff88105d814000 task.ti: ffff88105d814000 >>> RIP: 0010:[<ffffffff815a5c35>] [<ffffffff815a5c35>] >>> _raw_spin_lock_bh+0x15/0x40 >>> RSP: 0018:ffff88105d815d18 EFLAGS: 00010286 >>> RAX: 0000000000010000 RBX: ffffffffffffffff RCX: 0000000000000000 >>> RDX: 000000000000000b RSI: 0000000000000000 RDI: 0000000000000003 >>> RBP: ffff88105d815d18 R08: ffff88087c611f38 R09: 0000000000000001 >>> R10: 0000000000000000 R11: 0000000000000000 R12: ffff88087c3c9800 >>> R13: ffff88107b82ab00 R14: 0000000000000003 R15: 0000000000000007 >>> FS: 00007fef64612700(0000) GS:ffff88087fc00000(0000) knlGS:0000000000000000 >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 0000000000000003 CR3: 000000087c2c7000 CR4: 00000000000407f0 >>> Stack: >>> ffff88105d815d58 ffffffffa05199f0 ffff88105d815d88 ffff88087c3c9800 >>> ffff88087c3c9400 ffff88107b82ab00 ffff88087c3c9660 ffff88087c3c95c8 >>> ffff88105d815d78 ffffffffa0421ce9 ffff88087c3c9400 ffff88107b82aac0 >>> Call Trace: >>> [<ffffffffa05199f0>] svc_xprt_enqueue+0x50/0x220 [sunrpc] >>> [<ffffffffa0421ce9>] rdma_cma_handler+0x69/0x180 [svcrdma] >>> [<ffffffffa039d086>] cma_remove_one+0x1f6/0x220 [rdma_cm] >>> [<ffffffffa01dca86>] ib_unregister_device+0x46/0x120 [ib_core] >>> [<ffffffffa032ddc9>] mlx4_ib_remove+0x29/0x260 [mlx4_ib] >>> [<ffffffffa02fb9d0>] mlx4_remove_device+0xa0/0xc0 [mlx4_core] >>> [<ffffffffa02fba2b>] mlx4_unregister_interface+0x3b/0xa0 [mlx4_core] >>> [<ffffffffa033f4cc>] mlx4_ib_cleanup+0x10/0x23 [mlx4_ib] >>> [<ffffffff810bd6b2>] SyS_delete_module+0x152/0x220 >>> [<ffffffff811496e4>] ? vm_munmap+0x54/0x70 >>> [<ffffffff815adca6>] system_call_fastpath+0x1a/0x1f >>> Code: 5d c3 0f b7 17 66 39 ca 74 f6 f3 90 0f b7 17 66 39 d1 75 f6 5d c3 >>> 55 65 81 04 25 20 b9 00 00 00 02 00 00 48 89 e5 b8 00 00 01 00 <f0> 0f >>> c1 07 89 c2 c1 ea 10 66 39 c2 75 04 5d c3 f3 90 0f b7 07 >>> RIP [<ffffffff815a5c35>] _raw_spin_lock_bh+0x15/0x40 >>> RSP <ffff88105d815d18> >>> CR2: 0000000000000003 >>> ---[ end trace 18e02ff413ac4b9b ]--- >>> Kernel panic - not syncing: Fatal exception in interrupt >>> Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: >>> 0xffffffff80000000-0xffffffff9fffffff) >>> ---[ end Kernel panic - not syncing: Fatal exception in interrupt >>> >>> Kind regards, >>> Klemens >>> >>> -- >>> 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 >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Chuck Lever chuck[dot]lever[at]oracle[dot]com -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
