> On Jul 27, 2024, at 5:15 PM, Salvatore Bonaccorso <carnil@xxxxxxxxxx> wrote: > > Hi, > > On Wed, Jul 17, 2024 at 07:33:24AM +0200, Paul Menzel wrote: >> Dear Linux folks, >> >> >> Using Linux 5.15.160 on a Dell PowerEdge T440/021KCD, BIOS 2.11.2 >> 04/22/2021, a mount from another server hung. Linux logs: >> >> ``` >> $ dmesg -T >> [Wed Jul 3 16:39:34 2024] Linux version 5.15.160.mx64.476 >> (root@xxxxxxxxxxxxxxxxxxxxxxxxx) (gcc (GCC) 12.3.0, GNU ld (GNU Binutils) >> 2.41) #1 SMP Wed Jun 5 12:24:15 CEST 2024 >> [Wed Jul 3 16:39:34 2024] Command line: root=LABEL=root ro >> crashkernel=64G-:256M console=ttyS0,115200n8 console=tty0 init=/bin/systemd >> audit=0 random.trust_cpu=on systemd.unified_cgroup_hierarchy >> […] >> [Wed Jul 3 16:39:34 2024] DMI: Dell Inc. PowerEdge T440/021KCD, BIOS 2.11.2 >> 04/22/2021 >> […] >> [Tue Jul 16 06:00:10 2024] md: md3: data-check interrupted. >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000ee580afa xid 6890a3d2 >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000d4d84570 xid 3ca4017a >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000aeeb49cf xid b6f12d96 >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000056d1aff1 xid 6ad5584a >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000008075849 xid 406ed865 >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000028481e8f xid 7f81b676 >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000155c8644 xid 26099b1f >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000c384ff38 xid 7ed4dbf5 >> [Tue Jul 16 11:06:01 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 000000001bba6d7e xid a930d2bf >> [Tue Jul 16 11:11:04 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000155c8644 xid 5b099b1f >> [Tue Jul 16 11:11:04 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000c384ff38 xid b3d4dbf5 >> [Tue Jul 16 11:11:04 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 000000001bba6d7e xid de30d2bf >> [Tue Jul 16 11:20:21 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 000000001bba6d7e xid 4431d2bf >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 000000007ce5d717 xid 2c364663 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 000000001bba6d7e xid df31d2bf >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 000000000be8f11f xid acdab0f5 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000d6d182c4 xid 3d172cb9 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000976cd55a xid a6cb0a18 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000e11f40dd xid 35f006fd >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000042906e77 xid d9415db0 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000bc03be29 xid eed92785 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000056d1aff1 xid a1d6584a >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000008075849 xid 776fd865 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000aeeb49cf xid edf22d96 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 000000009327f72c xid 12b9ab32 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000b55d160f xid 0e3dd152 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000976cd55a xid a7cb0a18 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000042906e77 xid da415db0 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000bc03be29 xid efd92785 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000008075849 xid 786fd865 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000aeeb49cf xid eef22d96 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000ee580afa xid 9f91a3d2 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000060d5bb55 xid 3aea57c8 >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000d4d84570 xid 73a5017a >> [Tue Jul 16 11:35:58 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000155c8644 xid 5d0a9b1f >> [Tue Jul 16 11:35:59 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 0000000028481e8f xid b682b676 >> [Tue Jul 16 11:35:59 2024] receive_cb_reply: Got unrecognized reply: calldir >> 0x1 xpt_bc_xprt 00000000c384ff38 xid b5d5dbf5 >> [Tue Jul 16 11:36:40 2024] rcu: INFO: rcu_sched self-detected stall on CPU >> [Tue Jul 16 11:36:40 2024] rcu: 13-....: (20997 ticks this GP) >> idle=54f/1/0x4000000000000000 softirq=31904928/31904928 fqs=4433 >> [Tue Jul 16 11:36:40 2024] (t=21017 jiffies g=194958993 q=5715) >> [Tue Jul 16 11:36:40 2024] Task dump for CPU 13: >> [Tue Jul 16 11:36:40 2024] task:kworker/u34:2 state:R running task >> stack: 0 pid:30413 ppid: 2 flags:0x00004008 >> [Tue Jul 16 11:36:40 2024] Workqueue: rpciod rpc_async_schedule [sunrpc] >> [Tue Jul 16 11:36:40 2024] Call Trace: >> [Tue Jul 16 11:36:40 2024] <IRQ> >> [Tue Jul 16 11:36:40 2024] sched_show_task.cold+0xc2/0xda >> [Tue Jul 16 11:36:40 2024] rcu_dump_cpu_stacks+0xa1/0xd3 >> [Tue Jul 16 11:36:40 2024] rcu_sched_clock_irq.cold+0xc7/0x1e7 >> [Tue Jul 16 11:36:40 2024] ? trigger_load_balance+0x6d/0x300 >> [Tue Jul 16 11:36:40 2024] ? scheduler_tick+0xda/0x260 >> [Tue Jul 16 11:36:40 2024] update_process_times+0xa1/0xe0 >> [Tue Jul 16 11:36:40 2024] tick_sched_timer+0x8e/0xa0 >> [Tue Jul 16 11:36:40 2024] ? tick_sched_do_timer+0x90/0x90 >> [Tue Jul 16 11:36:40 2024] __hrtimer_run_queues+0x139/0x2a0 >> [Tue Jul 16 11:36:40 2024] hrtimer_interrupt+0xf4/0x210 >> [Tue Jul 16 11:36:40 2024] __sysvec_apic_timer_interrupt+0x5f/0xe0 >> [Tue Jul 16 11:36:40 2024] sysvec_apic_timer_interrupt+0x69/0x90 >> [Tue Jul 16 11:36:40 2024] </IRQ> >> [Tue Jul 16 11:36:40 2024] <TASK> >> [Tue Jul 16 11:36:40 2024] asm_sysvec_apic_timer_interrupt+0x16/0x20 >> [Tue Jul 16 11:36:40 2024] RIP: 0010:read_tsc+0x3/0x20 >> [Tue Jul 16 11:36:40 2024] Code: cc cc cc cc cc cc cc 8b 05 56 ab 72 01 c3 >> cc cc cc cc 0f 1f 44 00 00 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 >> 0f 01 f9 <66> 90 48 c1 e2 20 48 09 d0 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 >> [Tue Jul 16 11:36:40 2024] RSP: 0018:ffffc900087cfe00 EFLAGS: 00000246 >> [Tue Jul 16 11:36:40 2024] RAX: 00000000226dc8b8 RBX: 000000003f3c079e RCX: >> 000000000000100d >> [Tue Jul 16 11:36:40 2024] RDX: 00000000004535c4 RSI: 0000000000000046 RDI: >> ffffffff82435600 >> [Tue Jul 16 11:36:40 2024] RBP: 0003ed08d3641da3 R08: ffffffffa012c770 R09: >> ffffffffa012c788 >> [Tue Jul 16 11:36:40 2024] R10: 0000000000000003 R11: 0000000000000283 R12: >> 0000000000000000 >> [Tue Jul 16 11:36:40 2024] R13: 0000000000000001 R14: ffff88909311c000 R15: >> ffff88909311c005 >> [Tue Jul 16 11:36:40 2024] ktime_get+0x38/0xa0 >> [Tue Jul 16 11:36:40 2024] ? rpc_sleep_on_priority+0x70/0x70 [sunrpc] >> [Tue Jul 16 11:36:40 2024] rpc_exit_task+0x9a/0x100 [sunrpc] >> [Tue Jul 16 11:36:40 2024] __rpc_execute+0x6e/0x410 [sunrpc] >> [Tue Jul 16 11:36:40 2024] rpc_async_schedule+0x29/0x40 [sunrpc] >> [Tue Jul 16 11:36:40 2024] process_one_work+0x1d7/0x3a0 >> [Tue Jul 16 11:36:40 2024] worker_thread+0x4a/0x3c0 >> [Tue Jul 16 11:36:40 2024] ? process_one_work+0x3a0/0x3a0 >> [Tue Jul 16 11:36:40 2024] kthread+0x115/0x140 >> [Tue Jul 16 11:36:40 2024] ? set_kthread_struct+0x50/0x50 >> [Tue Jul 16 11:36:40 2024] ret_from_fork+0x1f/0x30 >> [Tue Jul 16 11:36:40 2024] </TASK> >> [Tue Jul 16 11:37:19 2024] rcu: INFO: rcu_sched self-detected stall on CPU >> [Tue Jul 16 11:37:19 2024] rcu: 7-....: (21000 ticks this GP) >> idle=5b1/1/0x4000000000000000 softirq=29984492/29984492 fqs=5159 >> [Tue Jul 16 11:37:19 2024] (t=21017 jiffies g=194959001 q=2008) >> [Tue Jul 16 11:37:19 2024] Task dump for CPU 7: >> [Tue Jul 16 11:37:19 2024] task:kworker/u34:2 state:R running task >> stack: 0 pid:30413 ppid: 2 flags:0x00004008 >> [Tue Jul 16 11:37:19 2024] Workqueue: rpciod rpc_async_schedule [sunrpc] >> [Tue Jul 16 11:37:19 2024] Call Trace: >> [Tue Jul 16 11:37:19 2024] <IRQ> >> [Tue Jul 16 11:37:19 2024] sched_show_task.cold+0xc2/0xda >> [Tue Jul 16 11:37:19 2024] rcu_dump_cpu_stacks+0xa1/0xd3 >> [Tue Jul 16 11:37:19 2024] rcu_sched_clock_irq.cold+0xc7/0x1e7 >> [Tue Jul 16 11:37:19 2024] ? trigger_load_balance+0x6d/0x300 >> [Tue Jul 16 11:37:19 2024] ? scheduler_tick+0xda/0x260 >> [Tue Jul 16 11:37:19 2024] update_process_times+0xa1/0xe0 >> [Tue Jul 16 11:37:19 2024] tick_sched_timer+0x8e/0xa0 >> [Tue Jul 16 11:37:19 2024] ? tick_sched_do_timer+0x90/0x90 >> [Tue Jul 16 11:37:19 2024] __hrtimer_run_queues+0x139/0x2a0 >> [Tue Jul 16 11:37:19 2024] hrtimer_interrupt+0xf4/0x210 >> [Tue Jul 16 11:37:19 2024] __sysvec_apic_timer_interrupt+0x5f/0xe0 >> [Tue Jul 16 11:37:19 2024] sysvec_apic_timer_interrupt+0x69/0x90 >> [Tue Jul 16 11:37:19 2024] </IRQ> >> [Tue Jul 16 11:37:19 2024] <TASK> >> [Tue Jul 16 11:37:19 2024] asm_sysvec_apic_timer_interrupt+0x16/0x20 >> [Tue Jul 16 11:37:19 2024] RIP: 0010:_raw_spin_lock+0x10/0x20 >> [Tue Jul 16 11:37:19 2024] Code: b8 00 02 00 00 f0 0f c1 07 a9 ff 01 00 00 >> 75 05 c3 cc cc cc cc e9 f0 05 59 ff 0f 1f 44 00 00 31 c0 ba 01 00 00 00 f0 >> 0f b1 17 <75> 05 c3 cc cc cc cc 89 c6 e9 62 02 59 ff 66 90 0f 1f 44 00 00 fa >> [Tue Jul 16 11:37:19 2024] RSP: 0018:ffffc900087cfe30 EFLAGS: 00000246 >> [Tue Jul 16 11:37:19 2024] RAX: 0000000000000000 RBX: ffff88997131a500 RCX: >> 0000000000000001 >> [Tue Jul 16 11:37:19 2024] RDX: 0000000000000001 RSI: ffff88997131a500 RDI: >> ffffffffa012c700 >> [Tue Jul 16 11:37:19 2024] RBP: ffffffffa012c700 R08: ffffffffa012c770 R09: >> ffffffffa012c788 >> [Tue Jul 16 11:37:19 2024] R10: 0000000000000003 R11: 0000000000000283 R12: >> ffff88997131a530 >> [Tue Jul 16 11:37:19 2024] R13: 0000000000000001 R14: ffff88909311c000 R15: >> ffff88909311c005 >> [Tue Jul 16 11:37:19 2024] __rpc_execute+0x95/0x410 [sunrpc] >> [Tue Jul 16 11:37:19 2024] rpc_async_schedule+0x29/0x40 [sunrpc] >> [Tue Jul 16 11:37:19 2024] process_one_work+0x1d7/0x3a0 >> [Tue Jul 16 11:37:19 2024] worker_thread+0x4a/0x3c0 >> [Tue Jul 16 11:37:19 2024] ? process_one_work+0x3a0/0x3a0 >> [Tue Jul 16 11:37:19 2024] kthread+0x115/0x140 >> [Tue Jul 16 11:37:19 2024] ? set_kthread_struct+0x50/0x50 >> [Tue Jul 16 11:37:19 2024] ret_from_fork+0x1f/0x30 >> [Tue Jul 16 11:37:19 2024] </TASK> >> [Tue Jul 16 11:37:57 2024] rcu: INFO: rcu_sched self-detected stall on CPU >> […] >> ``` > > FWIW, on one NFS server occurence we are seeing something very close > to the above but in the 5.10.y case for the Debian kernel after > updating to 5.10.218-1 to 5.10.221-1, so kernel after which had the > big NFS related stack backported. > > One backtrace we were able to catch was > > [...] > Jul 27 15:24:52 nfsserver kernel: receive_cb_reply: Got unrecognized reply: calldir 0x1 xpt_bc_xprt 000000003d26f7ec xid b172e1c6 > Jul 27 15:24:52 nfsserver kernel: receive_cb_reply: Got unrecognized reply: calldir 0x1 xpt_bc_xprt 0000000017f1552a xid a90d7751 > Jul 27 15:24:52 nfsserver kernel: receive_cb_reply: Got unrecognized reply: calldir 0x1 xpt_bc_xprt 000000006337c521 xid 8e5e58bd > Jul 27 15:24:54 nfsserver kernel: receive_cb_reply: Got unrecognized reply: calldir 0x1 xpt_bc_xprt 00000000cbf89319 xid c2da3c73 > Jul 27 15:24:54 nfsserver kernel: receive_cb_reply: Got unrecognized reply: calldir 0x1 xpt_bc_xprt 00000000e2588a21 xid a01bfec6 > Jul 27 15:24:54 nfsserver kernel: receive_cb_reply: Got unrecognized reply: calldir 0x1 xpt_bc_xprt 000000005fda63ca xid c2eeeaa6 > [...] > Jul 27 15:25:15 nfsserver kernel: rcu: INFO: rcu_sched self-detected stall on CPU > Jul 27 15:25:15 nfsserver kernel: rcu: 15-....: (5250 ticks this GP) idle=74e/1/0x4000000000000000 softirq=3160997/3161006 fqs=2233 > Jul 27 15:25:15 nfsserver kernel: (t=5255 jiffies g=8381377 q=106333) > Jul 27 15:25:15 nfsserver kernel: NMI backtrace for cpu 15 > Jul 27 15:25:15 nfsserver kernel: CPU: 15 PID: 3725556 Comm: kworker/u42:4 Not tainted 5.10.0-31-amd64 #1 Debian 5.10.221-1 > Jul 27 15:25:15 nfsserver kernel: Hardware name: DALCO AG S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 > Jul 27 15:25:15 nfsserver kernel: Workqueue: rpciod rpc_async_schedule [sunrpc] > Jul 27 15:25:15 nfsserver kernel: Call Trace: > Jul 27 15:25:15 nfsserver kernel: <IRQ> > Jul 27 15:25:15 nfsserver kernel: dump_stack+0x6b/0x83 > Jul 27 15:25:15 nfsserver kernel: nmi_cpu_backtrace.cold+0x32/0x69 > Jul 27 15:25:15 nfsserver kernel: ? lapic_can_unplug_cpu+0x80/0x80 > Jul 27 15:25:15 nfsserver kernel: nmi_trigger_cpumask_backtrace+0xdf/0xf0 > Jul 27 15:25:15 nfsserver kernel: rcu_dump_cpu_stacks+0xa5/0xd7 > Jul 27 15:25:15 nfsserver kernel: rcu_sched_clock_irq.cold+0x202/0x3d9 > Jul 27 15:25:15 nfsserver kernel: ? trigger_load_balance+0x5a/0x220 > Jul 27 15:25:15 nfsserver kernel: update_process_times+0x8c/0xc0 > Jul 27 15:25:15 nfsserver kernel: tick_sched_handle+0x22/0x60 > Jul 27 15:25:15 nfsserver kernel: tick_sched_timer+0x65/0x80 > Jul 27 15:25:15 nfsserver kernel: ? tick_sched_do_timer+0x90/0x90 > Jul 27 15:25:15 nfsserver kernel: __hrtimer_run_queues+0x127/0x280 > Jul 27 15:25:15 nfsserver kernel: hrtimer_interrupt+0x110/0x2c0 > Jul 27 15:25:15 nfsserver kernel: __sysvec_apic_timer_interrupt+0x5c/0xe0 > Jul 27 15:25:15 nfsserver kernel: asm_call_irq_on_stack+0xf/0x20 > Jul 27 15:25:15 nfsserver kernel: </IRQ> > Jul 27 15:25:15 nfsserver kernel: sysvec_apic_timer_interrupt+0x72/0x80 > Jul 27 15:25:15 nfsserver kernel: asm_sysvec_apic_timer_interrupt+0x12/0x20 > Jul 27 15:25:15 nfsserver kernel: RIP: 0010:mod_delayed_work_on+0x5d/0x90 > Jul 27 15:25:15 nfsserver kernel: Code: 00 4c 89 e7 e8 34 fe ff ff 89 c3 83 f8 f5 74 e9 85 c0 78 1b 89 ef 4c 89 f1 4c 89 e2 4c 89 ee e8 f9 fc ff ff 48 8b 3c 24 57 9d <0f> 1f 44 > > Jul 27 15:25:15 nfsserver kernel: RSP: 0018:ffffb5efe356fd90 EFLAGS: 00000246 > Jul 27 15:25:15 nfsserver kernel: RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000003820000f > Jul 27 15:25:15 nfsserver kernel: RDX: 0000000038000000 RSI: 0000000000000046 RDI: 0000000000000246 > Jul 27 15:25:15 nfsserver kernel: RBP: 0000000000002000 R08: ffffffffc0884430 R09: ffffffffc0884448 > Jul 27 15:25:15 nfsserver kernel: R10: 0000000000000003 R11: 0000000000000003 R12: ffffffffc0884428 > Jul 27 15:25:15 nfsserver kernel: R13: ffff8c89d0f6b800 R14: 00000000000001f4 R15: 0000000000000000 > Jul 27 15:25:15 nfsserver kernel: __rpc_sleep_on_priority_timeout+0x111/0x120 [sunrpc] > Jul 27 15:25:15 nfsserver kernel: rpc_delay+0x56/0x90 [sunrpc] > Jul 27 15:25:15 nfsserver kernel: rpc_exit_task+0x5a/0x140 [sunrpc] > Jul 27 15:25:15 nfsserver kernel: ? __rpc_do_wake_up_task_on_wq+0x1e0/0x1e0 [sunrpc] > Jul 27 15:25:15 nfsserver kernel: __rpc_execute+0x6d/0x410 [sunrpc] > Jul 27 15:25:15 nfsserver kernel: rpc_async_schedule+0x29/0x40 [sunrpc] > Jul 27 15:25:15 nfsserver kernel: process_one_work+0x1b3/0x350 > Jul 27 15:25:15 nfsserver kernel: worker_thread+0x53/0x3e0 > Jul 27 15:25:15 nfsserver kernel: ? process_one_work+0x350/0x350 > Jul 27 15:25:15 nfsserver kernel: kthread+0x118/0x140 > Jul 27 15:25:15 nfsserver kernel: ? __kthread_bind_mask+0x60/0x60 > Jul 27 15:25:15 nfsserver kernel: ret_from_fork+0x1f/0x30 > [...] > > Is there anything which could help debug this issue? The backtrace suggests an issue in the RPC client code; the server's NFSv4.1 backchannel would use that to send callbacks. Since 5.10.218 and 5.10.221 are only about a thousand commits apart, a bisect should be quick and narrow down the issue to one or two commits. -- Chuck Lever
