Le 19/03/2019 à 11:57, Pablo Sebastián Greco a écrit : > > El 19/3/19 a las 07:47, Stephan Guilloux escribió: >> Hi there. >> >> Strange issue with NFSv4 this morning. >> RPI3b+ with kernel 103 and fresh yum update, set up as NFSv4 client. >> >> Trying to copy a whole folder with a few GB (many .rpm & .tgz and a >> few .img), from NFS mounted source to local filesystem. >> (cd /shared.nfs ; tar c) | (cd /local ; tar x) >> >> After a while ... >> - PING to the RPI works. >> - SSH sessions got frozen and login is impossible, even with USB >> keyboard on the RPI. >> - Sometimes, I do see some kernel backtrace on the VGA, but not always. >> As I have to switch off the RPI, there is nothing left in >> /var/log/message when system is back. >> >> If I do this copy with full SSH, the copy works perfectly well. >> (ssh xxx "cd /xxx ; tar c") | (cd /local ; tar x) >> >> I have the feeling that the system hangs often on the same huge file, >> but when I do copy it manually, even in a loop ... nothin happens. >> >> Any idea ? >> >> > Stephan, was 4.14.101 your last "good" kernel? > We also have 4.14.103 and yesterday 4.14.106 was released. In case of interest, I'm running full Ethernet. No other USB device than a USB keyboard. Tests on 4.14.106 gave the same... but I succeeded to have a backtrace (see below) During this operation, the SSH sessions hanged for a few seconds, then, restarted again and so on, till this backtrace. This is why/when/how I was able to get this backtrace (while [ true ] ; do scp root at myrpi:/var/log/messages . ; done ) :-) Now, system is stuck. Mar 19 14:24:41 myrpi-8ac500 systemd-logind: Removed session 9. Mar 19 14:24:42 myrpi-8ac500 kernel: rpi_firmware_get_throttled: 5 callbacks suppressed Mar 19 14:24:42 myrpi-8ac500 kernel: Under-voltage detected! (0x00050005) << I noticed this 9s delay, here, but logs are not cut. Mar 19 14:24:51 myrpi-8ac500 kernel: INFO: rcu_sched self-detected stall on CPU Mar 19 14:24:51 myrpi-8ac500 kernel: #0112-...: (2099 ticks this GP) idle=6b6/140000000000001/0 softirq=7460/7460 fqs=1049 Mar 19 14:24:51 myrpi-8ac500 kernel: #011 (t=2100 jiffies g=3477 c=3476 q=4847) Mar 19 14:24:51 myrpi-8ac500 kernel: NMI backtrace for cpu 2 Mar 19 14:24:51 myrpi-8ac500 kernel: CPU: 2 PID: 1868 Comm: 192.168.57.231- Not tainted 4.14.106-v7.1.el7 #1 Mar 19 14:24:51 myrpi-8ac500 kernel: Hardware name: BCM2835 Mar 19 14:24:51 myrpi-8ac500 kernel: [<8010fec4>] (unwind_backtrace) from [<8010c120>] (show_stack+0x20/0x24) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8010c120>] (show_stack) from [<807c60b8>] (dump_stack+0xd4/0x118) Mar 19 14:24:51 myrpi-8ac500 kernel: [<807c60b8>] (dump_stack) from [<807cbecc>] (nmi_cpu_backtrace+0xc0/0xc4) Mar 19 14:24:51 myrpi-8ac500 kernel: [<807cbecc>] (nmi_cpu_backtrace) from [<807cbfb8>] (nmi_trigger_cpumask_backtrace+0xe8/0x124) Mar 19 14:24:51 myrpi-8ac500 kernel: [<807cbfb8>] (nmi_trigger_cpumask_backtrace) from [<8010e558>] (arch_trigger_cpumask_backtrace+0x20/0x24) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8010e558>] (arch_trigger_cpumask_backtrace) from [<80186240>] (rcu_dump_cpu_stacks+0xb4/0xe4) Mar 19 14:24:51 myrpi-8ac500 kernel: [<80186240>] (rcu_dump_cpu_stacks) from [<80185b18>] (rcu_check_callbacks+0x894/0xa3c) Mar 19 14:24:51 myrpi-8ac500 kernel: [<80185b18>] (rcu_check_callbacks) from [<8018bbf0>] (update_process_times+0x40/0x6c) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8018bbf0>] (update_process_times) from [<8019d628>] (tick_sched_handle+0x64/0x70) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8019d628>] (tick_sched_handle) from [<8019d85c>] (tick_sched_timer+0x50/0xa0) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8019d85c>] (tick_sched_timer) from [<8018c57c>] (__hrtimer_run_queues+0x160/0x30c) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8018c57c>] (__hrtimer_run_queues) from [<8018cf38>] (hrtimer_interrupt+0xc8/0x218) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8018cf38>] (hrtimer_interrupt) from [<806708bc>] (arch_timer_handler_phys+0x38/0x40) Mar 19 14:24:51 myrpi-8ac500 kernel: [<806708bc>] (arch_timer_handler_phys) from [<8017ac4c>] (handle_percpu_devid_irq+0x88/0x228) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8017ac4c>] (handle_percpu_devid_irq) from [<801755dc>] (generic_handle_irq+0x34/0x44) Mar 19 14:24:51 myrpi-8ac500 kernel: [<801755dc>] (generic_handle_irq) from [<80175c28>] (__handle_domain_irq+0x6c/0xc0) Mar 19 14:24:51 myrpi-8ac500 kernel: [<80175c28>] (__handle_domain_irq) from [<80101504>] (bcm2836_arm_irqchip_handle_irq+0xa8/0xac) Mar 19 14:24:51 myrpi-8ac500 kernel: [<80101504>] (bcm2836_arm_irqchip_handle_irq) from [<807e143c>] (__irq_svc+0x5c/0x7c) Mar 19 14:24:51 myrpi-8ac500 kernel: Exception stack(0xadf69df8 to 0xadf69e40) Mar 19 14:24:51 myrpi-8ac500 kernel: 9de0: b49addbc 00000000 Mar 19 14:24:51 myrpi-8ac500 kernel: 9e00: 1c961c95 1c951c95 b49add80 b2489d98 b2489c00 b4b1c8a8 b4b1c800 b4b1c8a8 Mar 19 14:24:51 myrpi-8ac500 kernel: 9e20: b4b1c800 adf69e54 adf69e58 adf69e48 803e0f50 807e0c3c 20000013 ffffffff Mar 19 14:24:51 myrpi-8ac500 kernel: [<807e143c>] (__irq_svc) from [<807e0c3c>] (_raw_spin_lock+0x24/0x54) Mar 19 14:24:51 myrpi-8ac500 kernel: [<807e0c3c>] (_raw_spin_lock) from [<803e0f50>] (nfs_delegation_grab_inode+0x20/0x4c) Mar 19 14:24:51 myrpi-8ac500 kernel: [<803e0f50>] (nfs_delegation_grab_inode) from [<803e2000>] (nfs_delegation_reap_unclaimed+0x7c/0xd8) Mar 19 14:24:51 myrpi-8ac500 kernel: [<803e2000>] (nfs_delegation_reap_unclaimed) from [<803dcfc4>] (nfs4_state_clear_reclaim_reboot+0x10c/0x114) Mar 19 14:24:51 myrpi-8ac500 kernel: [<803dcfc4>] (nfs4_state_clear_reclaim_reboot) from [<803dd7c0>] (nfs4_recovery_handle_error+0x58/0x148) Mar 19 14:24:51 myrpi-8ac500 kernel: [<803dd7c0>] (nfs4_recovery_handle_error) from [<803de9e4>] (nfs4_do_reclaim+0x738/0x7b4) Mar 19 14:24:51 myrpi-8ac500 kernel: [<803de9e4>] (nfs4_do_reclaim) from [<803dee84>] (nfs4_run_state_manager+0x424/0x768) Mar 19 14:24:51 myrpi-8ac500 kernel: [<803dee84>] (nfs4_run_state_manager) from [<8013dccc>] (kthread+0x13c/0x16c) Mar 19 14:24:51 myrpi-8ac500 kernel: [<8013dccc>] (kthread) from [<8010804c>] (ret_from_fork+0x14/0x28) Mar 19 14:24:52 myrpi-8ac500 systemd-logind: New session 10 of user root. Mar 19 14:24:52 myrpi-8ac500 systemd: Started Session 10 of user root. Mar 19 14:24:52 myrpi-8ac500 kernel: Under-voltage detected! (0x00050005) Mar 19 14:24:52 myrpi-8ac500 systemd-logind: Removed session 10. After this, if I do the same again with "SSH tar", instead of NFS access, the copy works fine ... Hmmm... > > Pablo > _______________________________________________ > Arm-dev mailing list > Arm-dev at centos.org > https://lists.centos.org/mailman/listinfo/arm-dev