Further to this, if I boot single user I can get a shell, then <Ctrl-D> to continue booting, whereupon the same panic may occur. I'm unsure if this is related, but I noticed I can reliably trigger a system freeze when changing runlevels. The system no longer responds to ping. The sequence of events is (starting in runlevel 5): root@wills:~# telinit 1 [ 604.336000] systemd-journald[169]: Received request to flush runtime journal from PID 1 Welcome to rescuGive root password for maintenance (or type Control-D to continue): root@wills:~# telinit 5 Hangup root@wills:~# [ 610.908000] systemd-journald[169]: Received request to flush runtime journal from PID 1 root@wills:~# Debian GNU/Linux stretch/sid wills ttyS0 wills login: ### At this point I have both a shell and a login prompt vying for input, ### pressing <Ctrl-D> in an attempt to exit the shell produces the freeze. [ 848.108000] INFO: task agetty:592 blocked for more than 120 seconds. [ 848.184000] Not tainted 4.1.0-1-parisc64-smp #1 [ 848.244000] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 848.336000] agetty D 00000000401630c0 0 592 1 0x00000110 [ 848.420000] Backtrace: [ 848.448000] [<000000004016c9b8>] __schedule+0x2a8/0x750 [ 848.512000] [<000000004016cea8>] schedule+0x48/0xc8 [ 848.572000] [<00000000401704a4>] schedule_timeout+0x1d4/0x240 [ 848.644000] [<000000004017106c>] ldsem_down_write+0x164/0x2d0 [ 848.712000] [<0000000040171b2c>] tty_ldisc_lock+0x2c/0xa8 [ 848.780000] [<00000000404e1e94>] tty_ldisc_hangup+0x12c/0x2e8 [ 848.848000] [<00000000404d6390>] __tty_hangup+0x498/0x680 [ 848.916000] [<00000000404d6c1c>] disassociate_ctty+0x94/0x420 [ 848.984000] [<00000000401a217c>] do_exit+0x99c/0xd18 [ 849.044000] [<00000000401a25b0>] do_group_exit+0x50/0xf0 [ 849.108000] [<00000000401a2670>] SyS_exit_group+0x20/0x28 [ 849.176000] [<0000000040164fc0>] syscall_exit+0x0/0x14 [ 849.240000] [ 969.256000] INFO: task agetty:592 blocked for more than 120 seconds. [ 969.332000] Not tainted 4.1.0-1-parisc64-smp #1 [ 969.392000] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 969.484000] agetty D 00000000401630c0 0 592 1 0x00000110 [ 969.568000] Backtrace: [ 969.596000] [<000000004016c9b8>] __schedule+0x2a8/0x750 [ 969.660000] [<000000004016cea8>] schedule+0x48/0xc8 [ 969.720000] [<00000000401704a4>] schedule_timeout+0x1d4/0x240 [ 969.792000] [<000000004017106c>] ldsem_down_write+0x164/0x2d0 [ 969.860000] [<0000000040171b2c>] tty_ldisc_lock+0x2c/0xa8 [ 969.928000] [<00000000404e1e94>] tty_ldisc_hangup+0x12c/0x2e8 [ 969.996000] [<00000000404d6390>] __tty_hangup+0x498/0x680 [ 970.064000] [<00000000404d6c1c>] disassociate_ctty+0x94/0x420 [ 970.132000] [<00000000401a217c>] do_exit+0x99c/0xd18 [ 970.192000] [<00000000401a25b0>] do_group_exit+0x50/0xf0 [ 970.256000] [<00000000401a2670>] SyS_exit_group+0x20/0x28 [ 970.324000] [<0000000040164fc0>] syscall_exit+0x0/0x14 [ 970.384000] On 16/08/15 16:14, Graham Gower wrote: > Hi, > > I'm seeing the panic below on a c8000. It happens sometimes when booting, just > before the login prompt is to appear. I've seen it with older kernels too, going > back to at least 3.19. > > -Graham > > > [ 62.596000] Backtrace: > [ 62.596000] [<00000000401fdb60>] handle_percpu_irq+0xb0/0xf0 > [ 62.596000] [<00000000401f7894>] generic_handle_irq+0x4c/0x68 > [ 62.596000] [<0000000040177670>] execute_on_irq_stack+0x90/0xa8 > [ 62.596000] [<0000000040178574>] do_cpu_irq_mask+0x1ec/0x3e0 > [ 62.596000] [<0000000040164074>] intr_return+0x0/0xc > [ 62.596000] > [ 62.596000] > [ 62.596000] Bad Address (null pointer deref?): Code=26 regs=0000000042a0a070 (Addr=0000000000000000) > [ 62.596000] CPU: 0 PID: 444 Comm: (agetty) Not tainted 4.1.0-1-parisc64-smp #1 Debian 4.1.3-1 > [ 62.596000] task: 000000007a9a7538 ti: 000000007dc38000 task.ti: 000000007dc38000 > [ 62.596000] > [ 62.596000] YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI > [ 62.596000] PSW: 00001000000001001111111100001110 Not tainted > [ 62.596000] r00-03 000000ff0804ff0e 00000000408b8f30 00000000401fdb60 0000000042a09f80 > [ 62.596000] r04-07 000000004089ff30 0000000000000000 0000000000000000 0000000000000000 > [ 62.596000] r08-11 0000000042a0a040 000000000000004c 0000000040932d40 000000000000004c > [ 62.596000] r12-15 000000000000004c 0000000000000001 00000000408d4f30 0000000000000001 > [ 62.596000] r16-19 00000000408b8f30 00000000408b8f30 0000000000000202 00000000028b3000 > [ 62.596000] r20-23 0000000042a0d020 bff7ffffffffffff 0000000040948420 fffc000000000000 > [ 62.596000] r24-27 0000000042a099d0 0000000000000000 0000000040932d40 000000004089ff30 > [ 62.596000] r28-31 0008000000000000 0000000042a09f50 0000000042a0a070 bff4000000000000 > [ 62.596000] sr00-03 000000000013f800 0000000000000000 0000000000000000 000000000013b000 > [ 62.596000] sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000 > [ 62.596000] > [ 62.596000] IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000401f861c 00000000401f8620 > [ 62.596000] IIR: 0ca010dc ISR: 0000000000000000 IOR: 0000000000000000 > [ 62.596000] CPU: 0 CR30: 000000007dc38000 CR31: ffffffffdbfeffff > [ 62.596000] ORIG_R28: 0000000040948420 > [ 62.596000] IAOQ[0]: handle_irq_event_percpu+0x8c/0x250 > [ 62.596000] IAOQ[1]: handle_irq_event_percpu+0x90/0x250 > [ 62.596000] RP(r2): handle_percpu_irq+0xb0/0xf0 > [ 62.596000] Backtrace: > [ 62.596000] [<00000000401fdb60>] handle_percpu_irq+0xb0/0xf0 > [ 62.596000] [<00000000401f7894>] generic_handle_irq+0x4c/0x68 > [ 62.596000] [<0000000040177670>] execute_on_irq_stack+0x90/0xa8 > [ 62.596000] [<0000000040178574>] do_cpu_irq_mask+0x1ec/0x3e0 > [ 62.596000] [<0000000040164074>] intr_return+0x0/0xc > [ 62.596000] > <Cpu0> 0300109100e00000 0000000000000000 CC_PROCS_ENTRY_OUT > [ 62.596000] Kernel panic - not syncing: Bad Address (null pointer deref?) > <Cpu0> 78000c6200e00000 a0e008c01100b009 CC_PAT_ENCODED_FIELD_WARNING > <Cpu0> 76000c6800e00000 0000000000000520 CC_PAT_DATA_FIELD_WARNING > <Cpu0> 0300109100e00000 0000000000000000 CC_PROCS_ENTRY_OUT > [ 62.596000] ---[ end Kernel panic - not syncing: Bad Address (null pointer deref?) > -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
