When running parisc-linux in qemu, I regularily face this crash. I'm out of ideas, maybe someone on the list has an idea what to check next? The very same issue happens with: - SMP and UP kernels - independend of kernel version - with 32-bit kernel only (qemu only supports 32bit up to now) The unaligned handler fault is misleading. What happens is, that the kernel tries to read from page zero: root@phantom:~# ./disasm 0e781093 0: 0e 78 10 93 ldw c(r19),r19 r19 is 0. For me it seems that some memory corruption happens which leads to this crash. Maybe in the SCSI code. And I wonder why the unaligned handler crash happens at all. Basically I'd expect a protection fault crash instead...? Many open questions in here... [34802.448356] Unaligned handler failed, ret = -2 [34802.454815] _______________________________ [34802.454815] < Your System ate a SPARC! Gah! > [34802.454815] ------------------------------- [34802.454815] \ ^__^ [34802.454815] (__)\ )\/\ [34802.454815] U ||----w | [34802.454815] || || [34802.458868] swapper/1 (pid 0): Unaligned data reference (code 28) [34802.459995] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.18.0-2-parisc-smp #1 Debian 4.18.10-2 [34802.462580] [34802.462826] YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI [34802.464205] PSW: 00000000000001000000000000001110 Not tainted [34802.465597] r00-03 0004000e 10a40950 102729f4 edfe3380 [34802.466663] r04-07 10a40bb0 00000000 dde64000 00000001 [34802.467455] r08-11 10187040 00000001 edfeb040 10a3cd40 [34802.468084] r12-15 10a40584 10ad3100 10947828 10947850 [34802.469252] r16-19 10a61950 00000002 00000000 00000000 [34802.470882] r20-23 00000000 00000000 00000000 00000000 [34802.472885] r24-27 00000001 00000000 00000000 10a40150 [34802.473871] r28-31 1018b930 00000000 edfe33c0 00000000 [34802.474617] sr00-03 00000000 00000000 00000000 0000017c [34802.475156] sr04-07 00000000 00000000 00000000 00000000 [34802.475653] [34802.475891] IASQ: 00000000 00000000 IAOQ: 102e6d60 102e6d64 [34802.476572] IIR: 0e781093 ISR: 00000000 IOR: 0000000d [34802.477396] CPU: 1 CR30: ed928000 CR31: 00000000 [34802.477896] ORIG_R28: 10943528 [34802.480131] IAOQ[0]: irq_work_run+0x24/0x6c [34802.481331] IAOQ[1]: irq_work_run+0x28/0x6c [34802.483985] RP(r2): flush_smp_call_function_queue+0xb8/0x19c [34802.485410] Backtrace: [34802.488657] [<102729f4>] flush_smp_call_function_queue+0xb8/0x19c [34802.490554] [<10273ae4>] generic_smp_call_function_single_interrupt+0x30/0x40 [34802.493022] [<1089f9e0>] ipi_interrupt+0x194/0x244 [34802.495289] [<10232120>] __handle_irq_event_percpu+0xd0/0x348 [34802.496823] [<102323dc>] handle_irq_event_percpu+0x44/0x8c [34802.497574] [<102381e8>] handle_percpu_irq+0xa4/0xd0 [34802.498082] [<102311e4>] generic_handle_irq+0x60/0x80 [34802.498758] [<101997d8>] call_on_stack+0x24/0x30 [34802.499705] [<101940c8>] execute_on_irq_stack+0xac/0xbc [34802.500131] [34802.500611] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.18.0-2-parisc-smp #1 Debian 4.18.10-2 [34802.501462] Backtrace: [34802.501462] [<101924a4>] show_stack+0x3c/0x50 [34802.501462] [<1087fc08>] dump_stack+0x8c/0x110 [34802.501462] [<101925d4>] die_if_kernel+0xe0/0x204 [34802.501462] [<101a0ad8>] handle_unaligned+0x5dc/0x790 [34802.501462] [<10192b88>] handle_interruption+0x2a0/0x1130 [34802.501462] [<10198074>] intr_check_sig+0x0/0x38 [34802.501462] [<00a90fac>] scsi_end_request+0x130/0x1e8 [scsi_mod] [34802.501462] [34802.510381] Kernel panic - not syncing: Fatal exception in interrupt PDC_CHASSIS: Fault (1), CHASSIS 0 PDC_CHASSIS: Shutdown (4), CHASSIS 0 SeaBIOS: PDC_BROADCAST_RESET (reset system) called with ARG3=10aef150 ARG4=0 SeaBIOS wants SYSTEM RESET. *************************** [34802.555377] Backtrace: [34802.556464] [34802.556919] [34802.557893] Bad Address (null pointer deref?): Code=15 (Data TLB miss fault) regs=848df0c5 (Addr=f0000084) [34802.558742] CPU: 2 PID: 17430 Comm: buildd-watcher Tainted: G D 4.18.0-2-parisc-smp #1 Debian 4.18.10-2 [34802.558742] [34802.556919] [34802.557893] Bad Address (null pointer deref?): Code=15 (Data TLB miss fault) regs=848df0c5 (Addr=f0000084) [34802.558742] CPU: 2 PID: 17430 Comm: buildd-watcher Tainted: G D 4.18.0-2-parisc-smp #1 Debian 4.18.10-2 [34802.558742] [34802.558742] YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI [34802.558742] PSW: 00000000000001001011111100001110 Tainted: G D [34802.558742] r00-03 0004bf0e 10ad2950 1089f8e8 edff9240 [34802.558742] r04-07 00000000 fff12000 10a40bb0 ee001008 [34802.558742] r08-11 10187040 00000002 ee001040 10a3cd40 [34802.558742] r12-15 10a40584 10ad3100 10947828 10947850 [34802.558742] r16-19 10a61950 00000002 0093691c 00000001 [34802.558742] r20-23 0000000e 00000001 10a40584 00000000 [34802.558742] r24-27 00000004 1089eb28 102b3dcc 10a40150 [34802.558742] r28-31 10ad3100 0000000e edff92c0 10a40584 [34802.558742] sr00-03 00000000 00000000 00000000 00002e54 [34802.558742] sr04-07 00000000 00000000 00000000 00000000 [34802.558742] [34802.558742] IASQ: 00000000 00000000 IAOQ: f0000084 f0000088 [34802.558742] IIR: 00000000 ISR: 00000000 IOR: f0000084 [34802.558742] CPU: 2 CR30: 4f1f8000 CR31: 00000000 [34802.558742] ORIG_R28: 00000001 [34802.558742] IAOQ[0]: 0xf0000084 [34802.558742] IAOQ[1]: 0xf0000088 [34802.558742] RP(r2): ipi_interrupt+0x9c/0x244 [34802.558742] Backtrace: [34802.558742] [34802.558742] Backtrace: [34802.558742] [<1024fd00>] collect_expieaBred_IOtimSe rs+0x3c/0x13c
