[Xperia Z Original Android Development] NamenIos:
I am having occasional reboots with my ZL on the 2016-11-01. As the modem part is identical to the Z I think this is also relevant for yuga and this thread seems to be the better frequented.

The last reboot I grabbed a log (/proc/lastkmesg). The relevant part follows:

[466006.552762] mdm_errfatal: mdm id 0 sent errfatal interrupt
[466006.557431] mdm_errfatal: Received err fatal from mdm id 0
[466006.562924] mdm_start_ssr: Resetting mdm id 0 due to mdm error
[466006.568875] subsys-restart: subsystem_restart_dev(): Restart sequence requested for external_modem, restart_level = 1.
[466006.579648] subsys-restart: subsystem_restart_dev(): Not rdtags present. Ignoring report for external_modem
[466006.589414] Kernel panic - not syncing: subsys-restart: Resetting the SoC - external_modem crashed.
[466006.598599] [<c010c2bc>] (unwind_backtrace+0x0/0x11c) from [<c0a292a0>] (panic+0x90/0x1e0)
[466006.606931] [<c0a292a0>] (panic+0x90/0x1e0) from [<c015c8e8>] (subsystem_restart_dev+0x12c/0x170)
[466006.615872] [<c015c8e8>] (subsystem_restart_dev+0x12c/0x170) from [<c017f248>] (mdm_errfatal+0xd8/0x110)
[466006.625394] [<c017f248>] (mdm_errfatal+0xd8/0x110) from [<c01e66e8>] (handle_irq_event_percpu+0xbc/0x2a0)
[466006.634976] [<c01e66e8>] (handle_irq_event_percpu+0xbc/0x2a0) from [<c01e6908>] (handle_irq_event+0x3c/0x5c)
[466006.644925] [<c01e6908>] (handle_irq_event+0x3c/0x5c) from [<c01e9304>] (handle_edge_irq+0x118/0x140)
[466006.654233] [<c01e9304>] (handle_edge_irq+0x118/0x140) from [<c01e5fd4>] (generic_handle_irq+0x20/0x30)
[466006.663693] [<c01e5fd4>] (generic_handle_irq+0x20/0x30) from [<c03e6734>] (msm_summary_irq_handler+0x80/0xbc)
[466006.673673] [<c03e6734>] (msm_summary_irq_handler+0x80/0xbc) from [<c01e66e8>] (handle_irq_event_percpu+0xbc/0x2a0)
[466006.684171] [<c01e66e8>] (handle_irq_event_percpu+0xbc/0x2a0) from [<c01e6908>] (handle_irq_event+0x3c/0x5c)
[466006.694058] [<c01e6908>] (handle_irq_event+0x3c/0x5c) from [<c01e93ec>] (handle_fasteoi_irq+0xc0/0x108)
[466006.703519] [<c01e93ec>] (handle_fasteoi_irq+0xc0/0x108) from [<c01e5fd4>] (generic_handle_irq+0x20/0x30)
[466006.713101] [<c01e5fd4>] (generic_handle_irq+0x20/0x30) from [<c0106874>] (handle_IRQ+0x6c/0x98)
[466006.722012] [<c0106874>] (handle_IRQ+0x6c/0x98) from [<c01004e0>] (gic_handle_irq+0x94/0x110)
[466006.730618] [<c01004e0>] (gic_handle_irq+0x94/0x110) from [<c0a37340>] (__irq_svc+0x40/0x74)
[466006.739102] Exception stack(0xc1fa1de8 to 0xc1fa1e30)
[466006.744168] 1de0: 00000001 00000001 00000001 c4cad720 c4ca0000 c115cf60
[466006.752469] 1e00: c4ca0004 00000004 c111d720 c115ca84 c111a040 00000000 00000000 c1fa1e30
[466006.760739] 1e20: c01cf3e0 c01cf400 00000013 ffffffff
[466006.765805] [<c0a37340>] (__irq_svc+0x40/0x74) from [<c01cf400>] (smp_call_function_many+0x27c/0x2b0)
[466006.775144] [<c01cf400>] (smp_call_function_many+0x27c/0x2b0) from [<c01cf478>] (smp_call_function+0x44/0x84)
[466006.785123] [<c01cf478>] (smp_call_function+0x44/0x84) from [<c069af30>] (cpuidle_latency_notify+0x14/0x20)
[466006.794949] [<c069af30>] (cpuidle_latency_notify+0x14/0x20) from [<c0a38cfc>] (notifier_call_chain+0x40/0x68)
[466006.804929] [<c0a38cfc>] (notifier_call_chain+0x40/0x68) from [<c01a9e20>] (__blocking_notifier_call_chain+0x40/0x58)
[466006.815610] [<c01a9e20>] (__blocking_notifier_call_chain+0x40/0x58) from [<c01a9e4c>] (blocking_notifier_call_chain+0x14/0x1c)
[466006.827054] [<c01a9e4c>] (blocking_notifier_call_chain+0x14/0x1c) from [<c01bff5c>] (pm_qos_update_target+0x110/0x124)
[466006.837827] [<c01bff5c>] (pm_qos_update_target+0x110/0x124) from [<c06b5620>] (msmsdcc_enable+0x24/0x148)
[466006.847409] [<c06b5620>] (msmsdcc_enable+0x24/0x148) from [<c069da94>] (__mmc_claim_host+0x168/0x178)
[466006.856748] [<c069da94>] (__mmc_claim_host+0x168/0x178) from [<c06ad2b8>] (mmc_blk_issue_rq+0x34/0x620)
[466006.866208] [<c06ad2b8>] (mmc_blk_issue_rq+0x34/0x620) from [<c06ae90c>] (mmc_queue_thread+0xa8/0x124)
[466006.875577] [<c06ae90c>] (mmc_queue_thread+0xa8/0x124) from [<c01a4014>] (kthread+0xa0/0xac)
[466006.884091] [<c01a4014>] (kthread+0xa0/0xac) from [<c0106a5c>] (kernel_thread_exit+0x0/0x8)
[466006.892453] CPU3: stopping
[466006.895291] [<c010c2bc>] (unwind_backtrace+0x0/0x11c) from [<c010b378>] (handle_IPI+0xfc/0x1e4)
[466006.903989] [<c010b378>] (handle_IPI+0xfc/0x1e4) from [<c0100550>] (gic_handle_irq+0x104/0x110)
[466006.912808] [<c0100550>] (gic_handle_irq+0x104/0x110) from [<c0a37340>] (__irq_svc+0x40/0x74)
[466006.921414] Exception stack(0xc0075f50 to 0xc0075f98)
[466006.926480] 5f40: 00000000 00000003 c4cbd918 00000000
[466006.934781] 5f60: c4cbd900 c0074030 00000000 c1236b00 00000003 c13dc6ac c1175334 00000003
[466006.943021] 5f80: 00000000 c0075f98 c01582ac c015eb8c 60000013 ffffffff
[466006.949643] [<c0a37340>] (__irq_svc+0x40/0x74) from [<c015eb8c>] (msm_cpuidle_enter+0x40/0x48)
[466006.958341] [<c015eb8c>] (msm_cpuidle_enter+0x40/0x48) from [<c069acdc>] (cpuidle_enter+0x14/0x18)
[466006.967404] [<c069acdc>] (cpuidle_enter+0x14/0x18) from [<c069b07c>] (cpuidle_enter_state+0x14/0x5c)
[466006.976621] [<c069b07c>] (cpuidle_enter_state+0x14/0x5c) from [<c069b27c>] (cpuidle_idle_call+0x1b8/0x318)
[466006.986356] [<c069b27c>] (cpuidle_idle_call+0x1b8/0x318) from [<c0106e28>] (cpu_idle+0x60/0xec)
[466006.995114] [<c0106e28>] (cpu_idle+0x60/0xec) from [<80c234b4>] (0x80c234b4)
[466007.002164] CPU2: stopping
[466007.002194] &@running_process@cpu3:*swapper/3*
[466007.009824] [<c010c2bc>] (unwind_backtrace+0x0/0x11c) from [<c010b378>] (handle_IPI+0xfc/0x1e4)
[466007.018582] [<c010b378>] (handle_IPI+0xfc/0x1e4) from [<c0100550>] (gic_handle_irq+0x104/0x110)
[466007.027158] [<c0100550>] (gic_handle_irq+0x104/0x110) from [<c0a37340>] (__irq_svc+0x40/0x74)
[466007.035916] Exception stack(0xc0073f50 to 0xc0073f98)
[466007.041043] 3f40: 00000000 00000003 c4cb3918 00000000
[466007.049100] 3f60: c4cb3900 c0072030 00000000 c1236b00 00000003 c13dc6ac c1175334 00000002
[466007.057523] 3f80: 00000000 c0073f98 c01582ac c015eb8c 60000013 ffffffff
[466007.064237] [<c0a37340>] (__irq_svc+0x40/0x74) from [<c015eb8c>] (msm_cpuidle_enter+0x40/0x48)
[466007.072751] [<c015eb8c>] (msm_cpuidle_enter+0x40/0x48) from [<c069acdc>] (cpuidle_enter+0x14/0x18)
[466007.081937] [<c069acdc>] (cpuidle_enter+0x14/0x18) from [<c069b07c>] (cpuidle_enter_state+0x14/0x5c)
[466007.091153] [<c069b07c>] (cpuidle_enter_state+0x14/0x5c) from [<c069b27c>] (cpuidle_idle_call+0x1b8/0x318)
[466007.100858] [<c069b27c>] (cpuidle_idle_call+0x1b8/0x318) from [<c0106e28>] (cpu_idle+0x60/0xec)
[466007.109647] [<c0106e28>] (cpu_idle+0x60/0xec) from [<80c234b4>] (0x80c234b4)
[466007.116574] &@running_process@cpu2:*swapper/2*
[466008.541043] SMP: failed to stop secondary CPUs
[466008.544614] wcnss_8960: crash shutdown : 0
[466008.749143] &@panic_name@:*mmcqd/0*
[466008.751950] Rebooting in 5 seconds..
[466015.061765] SMP: failed to stop secondary CPUs
[466015.065549]
[466015.067075] Restarting Linux version 3.4.112-cm-g2dceea3 (inky@cyanogenmod) (gcc version 4.8 (GCC) ) #1 SMP PREEMPT Tue Nov 1 15:18:45 PDT 2016
[466015.067075]
[466015.081601]
[466015.083127] Restarting Linux version 3.4.112-cm-g2dceea3 (inky@cyanogenmod) (gcc version 4.8 (GCC) ) #1 SMP PREEMPT Tue Nov 1 15:18:45 PDT 2016
[466015.083127]
[466015.098111] Going down for restart now

In case someone wants to look at the full log: http://pastebin.com/7X2hjWJp

Any help is appreciated.