On 07/21/2016 04:07 AM, Jitendra Bhivare wrote: > Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 21 > Pid: 13242, comm: flush-8:80 Tainted: G W -- ------------ > 2.6.32-573.el6.x86_64 #1 > Call Trace: > <NMI> [<ffffffff81537a84>] ? panic+0xa7/0x16f > [<ffffffff810149c9>] ? sched_clock+0x9/0x10 > [<ffffffff810ed4bd>] ? watchdog_overflow_callback+0xcd/0xd0 > [<ffffffff81124037>] ? __perf_event_overflow+0xa7/0x240 > [<ffffffff8101dc54>] ? x86_perf_event_set_period+0xf4/0x180 > [<ffffffff81124684>] ? perf_event_overflow+0x14/0x20 > [<ffffffff81024a02>] ? intel_pmu_handle_irq+0x202/0x3f0 > [<ffffffff8153cd89>] ? perf_event_nmi_handler+0x39/0xb0 > [<ffffffff8153e845>] ? notifier_call_chain+0x55/0x80 > [<ffffffff81389ba0>] ? scsi_done+0x0/0x60 > [<ffffffff8153e8aa>] ? atomic_notifier_call_chain+0x1a/0x20 > [<ffffffff810a788e>] ? notify_die+0x2e/0x30 > [<ffffffff8153c503>] ? do_nmi+0x1c3/0x350 > [<ffffffff8153bdc0>] ? nmi+0x20/0x30 > [<ffffffff81389ba0>] ? scsi_done+0x0/0x60 > [<ffffffff81389ba0>] ? scsi_done+0x0/0x60 > [<ffffffff8153b62e>] ? _spin_lock+0x1e/0x30 > <<EOE>> [<ffffffffa00e2eaf>] ? iscsi_queuecommand+0x7f/0x4e0 [libiscsi] > [<ffffffff81389df5>] ? scsi_dispatch_cmd+0xe5/0x310 > [<ffffffff813927be>] ? scsi_request_fn+0x5be/0x750 > [<ffffffff81089bad>] ? del_timer+0x7d/0xe0 > [<ffffffff81273542>] ? __generic_unplug_device+0x32/0x40 > [<ffffffff8126e823>] ? elv_insert+0xd3/0x190 > [<ffffffff8126e920>] ? __elv_add_request+0x40/0x90 > > In beiscsi_alloc_pdu, _bh versions of spin_lock are being used for > protecting SGLs and WRBs. _bh versions are needed as the function gets > invoked in process context and BLOCK_IOPOLL softirq. > > In spin_unlock_bh, after releasing the lock and enabling BH, do_softirq > is called which executes till last SOFTIRQ. > > beiscsi_alloc_pdu is called under session lock. Through block layer, > iSCSI stack in some cases send IOs with interrupts disabled. In such paths, What path is this? Is this with mq enabled or disabled? -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
