[I'm not subscribed to bugs@ ; please CC me if you would like more info.] Just installed a snapshot; getting some lock order reversals:
lock order reversal: 1st 0xffffff021a4bf8a0 vmmaplk (&map->lock) @ /usr/src/sys/uvm/uvm_fault.c:1441 2nd 0xffff800000112138 drmdevlk (&dev->struct_mutex) @ /usr/src/sys/dev/pci/drm/i915/i915_gem.c:1801 lock order "&dev->struct_mutex"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x4c0 #1 _rw_enter+0x68 #2 vm_map_lock_ln+0xbc #3 uvm_map+0x1a1 #4 uvm_km_valloc+0x6c #5 vmap+0x36 #6 vmap_batch+0xeb #7 i915_parse_cmds+0x15d #8 i915_gem_execbuffer2+0x1032 #9 drm_do_ioctl+0x221 #10 drmioctl+0xf9 #11 VOP_IOCTL+0x5a #12 vn_ioctl+0x6b #13 sys_ioctl+0x477 #14 syscall+0x32a #15 Xsyscall_untramp+0xe4 lock order "&map->lock"(rwlock) -> "&dev->struct_mutex"(rwlock) first seen at: #0 witness_checkorder+0x4c0 #1 _rw_enter_write+0x53 #2 i915_gem_object_wait_rendering__nonblocking+0x1fa #3 i915_gem_fault+0x144 #4 drm_fault+0x18a #5 uvm_fault+0x743 #6 pageflttrap+0x14c #7 trap+0x2b2 #8 recall_trap+0x8 lock order reversal: 1st 0xffffffff81db3b48 &sched_lock (&sched_lock) @ /usr/src/sys/kern/kern_synch.c:444 2nd 0xffff8000001089f0 &dev_priv->uncore.lock (&dev_priv->uncore.lock) @ /usr/src/sys/dev/pci/drm/i915/intel_uncore.c:811 lock order "&dev_priv->uncore.lock"(mutex) -> "&sched_lock"(sched_lock) first seen at: #0 witness_checkorder+0x4c0 #1 ___mp_lock+0x70 #2 schedclock+0x30 #3 hardclock+0xe3 #4 lapic_clockintr+0x3d #5 Xresume_lapic_ltimer+0x22 #6 x86_bus_space_mem_read_4 #7 ironlake_irq_handler+0x95 #8 intr_handler+0x74 #9 Xintr_ioapic_edge16_untramp+0x166 #10 acpicpu_idle+0x1ea #11 sched_idle+0x275 lock order "&sched_lock"(sched_lock) -> "&dev_priv->uncore.lock"(mutex) first seen at: #0 witness_checkorder+0x4c0 #1 _mtx_enter+0x31 #2 gen6_read32+0x8f #3 gen6_ring_get_seqno+0x3a #4 __i915_wait_request+0x232 #5 i915_gem_object_wait_rendering__nonblocking+0x1d6 #6 i915_gem_set_domain_ioctl+0xdb #7 drm_do_ioctl+0x221 #8 drmioctl+0xf9 #9 VOP_IOCTL+0x5a #10 vn_ioctl+0x6b #11 sys_ioctl+0x477 #12 syscall+0x32a #13 Xsyscall_untramp+0xe4 lock order reversal: 1st 0xffffffff81db3b48 &sched_lock (&sched_lock) @ /usr/src/sys/kern/kern_synch.c:444 2nd 0xffff80000010f270 &dev_priv->irq_lock (&dev_priv->irq_lock) @ /usr/src/sys/dev/pci/drm/i915/intel_ringbuffer.c:1787 lock order "&dev_priv->irq_lock"(mutex) -> "&sched_lock"(sched_lock) first seen at: #0 witness_checkorder+0x4c0 #1 ___mp_lock+0x70 #2 wakeup_n+0x39 #3 task_add+0x93 #4 gen6_rps_boost+0x129 #5 __i915_wait_request+0x155 #6 i915_gem_object_wait_rendering__nonblocking+0x1d6 #7 i915_gem_set_domain_ioctl+0xdb #8 drm_do_ioctl+0x221 #9 drmioctl+0xf9 #10 VOP_IOCTL+0x5a #11 vn_ioctl+0x6b #12 sys_ioctl+0x477 #13 syscall+0x32a #14 Xsyscall_untramp+0xe4 lock order "&sched_lock"(sched_lock) -> "&dev_priv->irq_lock"(mutex) first seen at: #0 witness_checkorder+0x4c0 #1 _mtx_enter+0x31 #2 gen6_ring_put_irq+0x36 #3 __i915_wait_request+0x367 #4 i915_gem_object_wait_rendering__nonblocking+0x1d6 #5 i915_gem_set_domain_ioctl+0xdb #6 drm_do_ioctl+0x221 #7 drmioctl+0xf9 #8 VOP_IOCTL+0x5a #9 vn_ioctl+0x6b #10 sys_ioctl+0x477 #11 syscall+0x32a #12 Xsyscall_untramp+0xe4 Full dmesg: OpenBSD 6.3-current (GENERIC.MP) #44: Thu Jun 21 16:41:24 MDT 2018 dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 8255762432 (7873MB) avail mem = 7929257984 (7561MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xdae9d000 (71 entries) bios0: vendor LENOVO version "G6ET93WW (2.53 )" date 02/04/2013 bios0: LENOVO 3444CUU acpi0 at bios0: rev 2 acpi0: sleep states S0 S3 S4 S5 acpi0: tables DSDT FACP SLIC TCPA SSDT SSDT SSDT HPET APIC MCFG ECDT FPDT ASF! UEFI UEFI MSDM SSDT SSDT UEFI SSDT DBG2 acpi0: wakeup devices LID_(S4) SLPB(S3) IGBE(S4) EXP2(S4) XHCI(S3) EHC1(S3) EHC2(S3) HDEF(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpihpet0 at acpi0: 14318179 Hz acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: Intel(R) Core(TM) i7-3667U CPU @ 2.00GHz, 1896.08 MHz cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,IBRS,IBPB,STIBP,SENSOR,ARAT,XSAVEOPT,MELTDOWN cpu0: 256KB 64b/line 8-way L2 cache cpu0: smt 0, core 0, package 0 mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges cpu0: apic clock running at 99MHz cpu0: mwait min=64, max=64, C-substates=0.2.1.1.2, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Core(TM) i7-3667U CPU @ 2.00GHz, 1895.69 MHz cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,IBRS,IBPB,STIBP,SENSOR,ARAT,XSAVEOPT,MELTDOWN cpu1: 256KB 64b/line 8-way L2 cache cpu1: smt 1, core 0, package 0 cpu2 at mainbus0: apid 2 (application processor) cpu2: Intel(R) Core(TM) i7-3667U CPU @ 2.00GHz, 1895.70 MHz cpu2: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,IBRS,IBPB,STIBP,SENSOR,ARAT,XSAVEOPT,MELTDOWN cpu2: 256KB 64b/line 8-way L2 cache cpu2: smt 0, core 1, package 0 cpu3 at mainbus0: apid 3 (application processor) cpu3: Intel(R) Core(TM) i7-3667U CPU @ 2.00GHz, 1895.69 MHz cpu3: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,RDTSCP,LONG,LAHF,PERF,ITSC,FSGSBASE,SMEP,ERMS,IBRS,IBPB,STIBP,SENSOR,ARAT,XSAVEOPT,MELTDOWN cpu3: 256KB 64b/line 8-way L2 cache cpu3: smt 1, core 1, package 0 ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63 acpiec0 at acpi0 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (PEG_) acpiprt2 at acpi0: bus 2 (EXP1) acpiprt3 at acpi0: bus 3 (EXP2) acpicpu0 at acpi0: C2(350@80 mwait.1@0x20), C1(1000@1 mwait.1), PSS acpicpu1 at acpi0: C2(350@80 mwait.1@0x20), C1(1000@1 mwait.1), PSS acpicpu2 at acpi0: C2(350@80 mwait.1@0x20), C1(1000@1 mwait.1), PSS acpicpu3 at acpi0: C2(350@80 mwait.1@0x20), C1(1000@1 mwait.1), PSS acpipwrres0 at acpi0: PUBS, resource for XHCI, EHC1, EHC2 acpitz0 at acpi0: critical temperature is 200 degC acpibtn0 at acpi0: LID_ acpibtn1 at acpi0: SLPB "MSFT9000" at acpi0 not configured "MSFT9001" at acpi0 not configured acpicmos0 at acpi0 "LEN0071" at acpi0 not configured "LEN0030" at acpi0 not configured "SMO1200" at acpi0 not configured acpibat0 at acpi0: BAT0 model "45N1071" serial 1475 type LiP oem "SMP" acpiac0 at acpi0: AC unit online "LEN0078" at acpi0 not configured acpithinkpad0 at acpi0 "PNP0C14" at acpi0 not configured "PNP0C14" at acpi0 not configured "INT33A0" at acpi0 not configured acpivideo0 at acpi0: VID_ acpivout at acpivideo0 not configured acpivideo1 at acpi0: VID_ cpu0: Enhanced SpeedStep 1896 MHz: speeds: 2001, 2000, 1900, 1800, 1700, 1600, 1500, 1400, 1300, 1200, 1100, 1000, 900, 800 MHz pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "Intel Core 3G Host" rev 0x09 inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 4000" rev 0x09 drm0 at inteldrm0 inteldrm0: msi inteldrm0: 1600x900, 32bpp wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation) wsdisplay0: screen 1-5 added (std, vt100 emulation) "Intel 7 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured puc0 at pci0 dev 22 function 3 "Intel 7 Series KT" rev 0x04: ports: 16 com com4 at puc0 port 0 apic 2 int 19: ns16550a, 16 byte fifo com4: probed fifo depth: 0 bytes ehci0 at pci0 dev 26 function 0 "Intel 7 Series USB" rev 0x04: apic 2 int 16 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 azalia0 at pci0 dev 27 function 0 "Intel 7 Series HD Audio" rev 0x04: msi azalia0: codecs: Realtek ALC269, Intel/0x2806, using Realtek ALC269 audio0 at azalia0 ppb0 at pci0 dev 28 function 0 "Intel 7 Series PCIE" rev 0xc4: msi pci1 at ppb0 bus 2 sdhc0 at pci1 dev 0 function 0 "Ricoh 5U822 SD/MMC" rev 0x07: apic 2 int 16 sdhc0: SDHC 3.0, 50 MHz base clock sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed, dma ppb1 at pci0 dev 28 function 1 "Intel 7 Series PCIE" rev 0xc4: msi pci2 at ppb1 bus 3 iwn0 at pci2 dev 0 function 0 "Intel Centrino Advanced-N 6205" rev 0x96: msi, MIMO 2T2R, MoW, address 84:3a:4b:0a:ae:80 ehci1 at pci0 dev 29 function 0 "Intel 7 Series USB" rev 0x04: apic 2 int 23 usb1 at ehci1: USB revision 2.0 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 pcib0 at pci0 dev 31 function 0 "Intel QS77 LPC" rev 0x04 ahci0 at pci0 dev 31 function 2 "Intel 7 Series AHCI" rev 0x04: msi, AHCI 1.3 ahci0: port 0: 6.0Gb/s scsibus1 at ahci0: 32 targets sd0 at scsibus1 targ 0 lun 0: <ATA, INTEL SSDSCMMW24, LE9i> SCSI3 0/direct fixed naa.5001517803db5380 sd0: 228936MB, 512 bytes/sector, 468862128 sectors, thin ichiic0 at pci0 dev 31 function 3 "Intel 7 Series SMBus" rev 0x04: apic 2 int 18 iic0 at ichiic0 isa0 at pcib0 isadma0 at isa0 pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pckbd0 at pckbc0 (kbd slot) wskbd0 at pckbd0: console keyboard, using wsdisplay0 pms0 at pckbc0 (aux slot) wsmouse0 at pms0 mux 0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 error: [drm:pid0:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo underrun on pch transcoder A error: [drm:pid0:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder A FIFO underrun uhub2 at uhub0 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2 ugen0 at uhub2 port 3 "Auth Biometric Coprocessor" rev 1.10/0.01 addr 3 ugen1 at uhub2 port 4 "Broadcom Corp BCM20702A0" rev 2.00/1.12 addr 4 uvideo0 at uhub2 port 6 configuration 1 interface 0 "SunplusIT INC. Integrated Camera" rev 2.00/36.22 addr 5 video0 at uvideo0 uhub3 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2 uhidev0 at uhub3 port 3 configuration 1 interface 0 "eGalax Inc. eGalaxTouch EXC7903-66v03_T1" rev 2.00/66.03 addr 3 uhidev0: iclass 3/1, 7 report ids ums0 at uhidev0 reportid 1: 2 buttons wsmouse1 at ums0 mux 0 uhid0 at uhidev0 reportid 3: input=63, output=63, feature=0 uhid1 at uhidev0 reportid 5: input=0, output=0, feature=2 ums1 at uhidev0 reportid 6: 1 button, tip wsmouse2 at ums1 mux 0 ums2 at uhidev0 reportid 7 ums2: mouse has no X report vscsi0 at root scsibus2 at vscsi0: 256 targets softraid0 at root scsibus3 at softraid0: 256 targets sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006> SCSI2 0/direct fixed sd1: 227906MB, 512 bytes/sector, 466751982 sectors root on sd1a (a1a57dffe6790454.a) swap on sd1b dump on sd1b lock order reversal: 1st 0xffffff021a4bf8a0 vmmaplk (&map->lock) @ /usr/src/sys/uvm/uvm_fault.c:1441 2nd 0xffff800000112138 drmdevlk (&dev->struct_mutex) @ /usr/src/sys/dev/pci/drm/i915/i915_gem.c:1801 lock order "&dev->struct_mutex"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x4c0 #1 _rw_enter+0x68 #2 vm_map_lock_ln+0xbc #3 uvm_map+0x1a1 #4 uvm_km_valloc+0x6c #5 vmap+0x36 #6 vmap_batch+0xeb #7 i915_parse_cmds+0x15d #8 i915_gem_execbuffer2+0x1032 #9 drm_do_ioctl+0x221 #10 drmioctl+0xf9 #11 VOP_IOCTL+0x5a #12 vn_ioctl+0x6b #13 sys_ioctl+0x477 #14 syscall+0x32a #15 Xsyscall_untramp+0xe4 lock order "&map->lock"(rwlock) -> "&dev->struct_mutex"(rwlock) first seen at: #0 witness_checkorder+0x4c0 #1 _rw_enter_write+0x53 #2 i915_gem_object_wait_rendering__nonblocking+0x1fa #3 i915_gem_fault+0x144 #4 drm_fault+0x18a #5 uvm_fault+0x743 #6 pageflttrap+0x14c #7 trap+0x2b2 #8 recall_trap+0x8 lock order reversal: 1st 0xffffffff81db3b48 &sched_lock (&sched_lock) @ /usr/src/sys/kern/kern_synch.c:444 2nd 0xffff8000001089f0 &dev_priv->uncore.lock (&dev_priv->uncore.lock) @ /usr/src/sys/dev/pci/drm/i915/intel_uncore.c:811 lock order "&dev_priv->uncore.lock"(mutex) -> "&sched_lock"(sched_lock) first seen at: #0 witness_checkorder+0x4c0 #1 ___mp_lock+0x70 #2 schedclock+0x30 #3 hardclock+0xe3 #4 lapic_clockintr+0x3d #5 Xresume_lapic_ltimer+0x22 #6 x86_bus_space_mem_read_4 #7 ironlake_irq_handler+0x95 #8 intr_handler+0x74 #9 Xintr_ioapic_edge16_untramp+0x166 #10 acpicpu_idle+0x1ea #11 sched_idle+0x275 lock order "&sched_lock"(sched_lock) -> "&dev_priv->uncore.lock"(mutex) first seen at: #0 witness_checkorder+0x4c0 #1 _mtx_enter+0x31 #2 gen6_read32+0x8f #3 gen6_ring_get_seqno+0x3a #4 __i915_wait_request+0x232 #5 i915_gem_object_wait_rendering__nonblocking+0x1d6 #6 i915_gem_set_domain_ioctl+0xdb #7 drm_do_ioctl+0x221 #8 drmioctl+0xf9 #9 VOP_IOCTL+0x5a #10 vn_ioctl+0x6b #11 sys_ioctl+0x477 #12 syscall+0x32a #13 Xsyscall_untramp+0xe4 lock order reversal: 1st 0xffffffff81db3b48 &sched_lock (&sched_lock) @ /usr/src/sys/kern/kern_synch.c:444 2nd 0xffff80000010f270 &dev_priv->irq_lock (&dev_priv->irq_lock) @ /usr/src/sys/dev/pci/drm/i915/intel_ringbuffer.c:1787 lock order "&dev_priv->irq_lock"(mutex) -> "&sched_lock"(sched_lock) first seen at: #0 witness_checkorder+0x4c0 #1 ___mp_lock+0x70 #2 wakeup_n+0x39 #3 task_add+0x93 #4 gen6_rps_boost+0x129 #5 __i915_wait_request+0x155 #6 i915_gem_object_wait_rendering__nonblocking+0x1d6 #7 i915_gem_set_domain_ioctl+0xdb #8 drm_do_ioctl+0x221 #9 drmioctl+0xf9 #10 VOP_IOCTL+0x5a #11 vn_ioctl+0x6b #12 sys_ioctl+0x477 #13 syscall+0x32a #14 Xsyscall_untramp+0xe4 lock order "&sched_lock"(sched_lock) -> "&dev_priv->irq_lock"(mutex) first seen at: #0 witness_checkorder+0x4c0 #1 _mtx_enter+0x31 #2 gen6_ring_put_irq+0x36 #3 __i915_wait_request+0x367 #4 i915_gem_object_wait_rendering__nonblocking+0x1d6 #5 i915_gem_set_domain_ioctl+0xdb #6 drm_do_ioctl+0x221 #7 drmioctl+0xf9 #8 VOP_IOCTL+0x5a #9 vn_ioctl+0x6b #10 sys_ioctl+0x477 #11 syscall+0x32a #12 Xsyscall_untramp+0xe4 error: [drm:pid32844:intel_pipe_update_start] *ERROR* Potential atomic update failure on pipe A