Messages in this thread | | | Date | Thu, 18 Aug 2022 15:13:56 +0530 | Subject | Re: [linux] [5.19.0] task hung for indefinite time with call traces when rebooted with Kexec | From | Tasmiya Nalatwad <> |
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Greetings,
Please find the location in source code from where i am seeing the call traces generating
File : kernel/hung_task.c
/* * Ok, the task did not get scheduled for more than 2 minutes, * complain: */ if (sysctl_hung_task_warnings) { if (sysctl_hung_task_warnings > 0) sysctl_hung_task_warnings--; pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n", t->comm, t->pid, (jiffies - t->last_switch_time) / HZ); pr_err(" %s %s %.*s\n", print_tainted(), init_utsname()->release, (int)strcspn(init_utsname()->version, " "), init_utsname()->version); pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\"" " disables this message.\n"); sched_show_task(t); hung_task_show_lock = true;
if (sysctl_hung_task_all_cpu_backtrace) hung_task_show_all_bt = true; }
touch_nmi_watchdog(); }
On 8/6/22 15:30, Tetsuo Handa wrote: > On 2022/08/05 15:54, Tasmiya Nalatwad wrote: >> Greetings, >> >> [linux] [5.19.0] task hung for indefinite time with call traces when rebooted with Kexec, A restart is required to recover the machine. > > kexec is waiting for workqueues ("kworker/3:1" and "kworker/3:0") to complete. > If this problem happens only when rebooting with kexec, something in kexec path > might be preventing these workqueues from completing. > > Anyway, please repost with locations in source code like syzbot report does. > > [ 1104.673153] task:kworker/3:1 state:D stack: 0 pid: 221 ppid: 2 flags:0x00000800 > [ 1104.673160] Workqueue: fc_wq_0 fc_rport_final_delete [scsi_transport_fc] > [ 1104.673170] Call Trace: > [ 1104.673173] [c0000000060eb860] [0000000000000004] 0x4 (unreliable) > [ 1104.673178] [c0000000060eba50] [c00000000001e378] __switch_to+0x288/0x4a0 > [ 1104.673185] [c0000000060ebab0] [c000000000d23e84] __schedule+0x2c4/0x8c0 > [ 1104.673190] [c0000000060ebb80] [c000000000d244e8] schedule+0x68/0x130 > [ 1104.673196] [c0000000060ebbb0] [c0000000008d4574] scsi_remove_target+0x314/0x390 > > [ 1104.673233] task:kworker/3:0 state:D stack: 0 pid:227332 ppid: 2 flags:0x00000880 > [ 1104.673237] Workqueue: fc_wq_0 fc_rport_final_delete [scsi_transport_fc] > [ 1104.673243] Call Trace: > [ 1104.673244] [c0000000726bb860] [c0000000001b9cb4] enqueue_entity+0x184/0x4f0 (unreliable) > [ 1104.673250] [c0000000726bba50] [c00000000001e378] __switch_to+0x288/0x4a0 > [ 1104.673254] [c0000000726bbab0] [c000000000d23e84] __schedule+0x2c4/0x8c0 > [ 1104.673258] [c0000000726bbb80] [c000000000d244e8] schedule+0x68/0x130 > [ 1104.673262] [c0000000726bbbb0] [c0000000008d4574] scsi_remove_target+0x314/0x390 > [ > [ 1104.673295] task:kexec state:D stack: 0 pid:228289 ppid: 1 flags:0x00040080 > [ 1104.673299] Call Trace: > [ 1104.673301] [c000000069147510] [c00000000001e378] __switch_to+0x288/0x4a0 > [ 1104.673305] [c000000069147570] [c000000000d23e84] __schedule+0x2c4/0x8c0 > [ 1104.673309] [c000000069147640] [c000000000d244e8] schedule+0x68/0x130 > [ 1104.673313] [c000000069147670] [c000000000d2e028] schedule_timeout+0x348/0x3f0 > [ 1104.673317] [c000000069147750] [c000000000d2554c] wait_for_completion+0xcc/0x2b0 > [ 1104.673321] [c0000000691477d0] [c00000000017cbe8] flush_workqueue+0x158/0x520 > [ 1104.673325] [c000000069147870] [c00000000017d068] drain_workqueue+0xb8/0x240 > [ 1104.673329] [c000000069147930] [c0000000001825e0] destroy_workqueue+0x60/0x420 > [ 1104.673333] [c0000000691479c0] [c0080000009291e4] fc_remove_host+0x21c/0x280 [scsi_transport_fc] > >
-- Regards, Tasmiya Nalatwad IBM Linux Technology Center
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