I guess it’s know issue caused by ifioctl() races.
> On 5 Aug 2020, at 19:06, Sven F. <sven.falem...@gmail.com> wrote:
>
> On Wed, Aug 5, 2020 at 9:14 AM Sven F. <sven.falem...@gmail.com> wrote:
>>
>> Never seen before crash ( 6. 7 stable )
>>
>> My devices run a lot of things in, load is easily 4
>> which is good for breaking lock code ?
>>
>> uvm_fault(0xfffffd820a916cc0, 0x8, 0, 1) -> e
>> kernel: page fault trap, code=0
>> Stopped at bridge_brlconf+0x24: movq 0x8(%rdi),%rax
>> ddb{1}> bridge_brlconf(0,ffff800022e482b0) at bridge_brlconf+0x24
>> bridge_ioctl(ffff800000524000,c030694f,ffff800022e482b0) at
>> bridge_ioctl+0x34f
>> ifioctl(fffffd8118f33c98,c030694f,ffff800022e482b0,ffff800022895510)
>> at ifioctl+0xa03
>> soo_ioctl(fffffd814c9cf2e8,c030694f,ffff800022e482b0,ffff800022895510)
>> at soo_ioctl+0x171
>> sys_ioctl(ffff800022895510,ffff800022e483c0,ffff800022e48420) at
>> sys_ioctl+0x2df
>> syscall(ffff800022e48490) at syscall+0x389
>> Xsyscall() at Xsyscall+0x128
>> end of kernel
>> end trace frame: 0x7f7ffffd2c30, count: -7
>> ddb{1}> PID TID PPID UID S FLAGS WAIT COMMAND
>> 93583 108149 190 0 3 0x2 smrbar ifconfig
>> 91803 290614 22775 0 2 0 perl
>> 10793 382902 22775 0 2 0 perl
>> 83906 60674 57936 0 2 0x2 ifconfig
>> *80202 204044 63585 0 7 0x2 ifconfig
>> 63585 7414 22775 0 3 0x80 piperd perl
>> 57936 439878 22775 0 3 0x80 piperd perl
>> 70874 88156 22775 0 7 0 perl
>> 72682 513697 1 0 3 0x80 poll openvpn
>> 84518 279046 22775 0 2 0 perl
>> 55262 52512 22775 0 2 0 perl
>> 36158 256298 22775 0 2 0 perl
>> 84969 398264 1 0 3 0x80 poll openvpn
>> 31484 239479 1 0 3 0x80 poll openvpn
>> 7902 84087 60669 0 3 0x82 netio sshd
>> 25285 366282 1 0 3 0x80 poll openvpn
>> 96838 424361 1 0 3 0x80 poll openvpn
>> 42763 368876 1 0 3 0x80 poll openvpn
>> 92032 243887 1 0 3 0x80 poll openvpn
>> 22775 200805 21119 0 2 0x2 perl
>> 21119 407468 75737 0 3 0x10008a pause sh
>> ddb{1}> rebooting...
>> OpenBSD 6.7-stable (GENERIC.MP) #43: Tue Jul 28 21:46:24 EDT 2020
>> root@builder:/sys/arch/amd64/compile/GENERIC.MP
>> real mem = 8371683328 (7983MB)
>> avail mem = 8105316352 (7729MB)
>> mpath0 at root
>> scsibus0 at mpath0: 256 targets
>> mainbus0 at root
>> bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xf6830 (11 entries)
>> bios0: vendor SeaBIOS version "2:1.10.2-58953eb7" date 04/01/2014
>> bios0: OpenStack Foundation OpenStack Nova
>> acpi0 at bios0: ACPI 1.0
>> acpi0: sleep states S3 S4 S5
>> acpi0: tables DSDT FACP APIC
>> acpi0: wakeup devices
>> acpitimer0 at acpi0: 3579545 Hz, 24 bits
>> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
>> cpu0 at mainbus0: apid 0 (boot processor)
>> cpu0: Intel Core Processor (Haswell, no TSX), 2394.80 MHz, 06-3c-01
>> cpu0:
>> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,PCLMUL,VMX,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,RDTSCP,LONG,LAHF,ABM,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,ARAT,XSAVEOPT,MELTDOWN
>> cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB
>> 64b/line 16-way L2 cache
>> cpu0: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped
>> cpu0: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped
>> cpu0: smt 0, core 0, package 0
>> mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
>> cpu0: apic clock running at 1000MHz
>> cpu1 at mainbus0: apid 1 (application processor)
>> cpu1: Intel Core Processor (Haswell, no TSX), 2394.56 MHz, 06-3c-01
>> cpu1:
>> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,PCLMUL,VMX,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,RDTSCP,LONG,LAHF,ABM,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,ARAT,XSAVEOPT,MELTDOWN
>> cpu1: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB
>> 64b/line 16-way L2 cache
>> cpu1: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped
>> cpu1: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped
>> cpu1: smt 0, core 0, package 1
>> ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
>> acpiprt0 at acpi0: bus 0 (PCI0)
>> acpicpu0 at acpi0: C1(@1 halt!)
>> acpicpu1 at acpi0: C1(@1 halt!)
>> "ACPI0006" at acpi0 not configured
>> acpipci0 at acpi0 PCI0: _OSC failed
>> acpicmos0 at acpi0
>> "PNP0A06" at acpi0 not configured
>> "PNP0A06" at acpi0 not configured
>> "PNP0A06" at acpi0 not configured
>> "QEMU0002" at acpi0 not configured
>> "ACPI0010" at acpi0 not configured
>> cpu0: using VERW MDS workaround
>> pvbus0 at mainbus0: KVM
>> pvclock0 at pvbus0
>> pci0 at mainbus0 bus 0
>> pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02
>> pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00
>> pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA,
>> channel 0 wired to compatibility, channel 1 wired to compatibility
>> pciide0: channel 0 disabled (no drives)
>> pciide0: channel 1 disabled (no drives)
>> uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 0 int 11
>> piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0 int 9
>> iic0 at piixpm0
>> vga1 at pci0 dev 2 function 0 "Cirrus Logic CL-GD5446" rev 0x00
>> wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
>> wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
>> virtio0 at pci0 dev 3 function 0 "Qumranet Virtio Network" rev 0x00
>> vio0 at virtio0: address fa:16:3e:d5:60:9d
>> virtio0: msix shared
>> virtio1 at pci0 dev 4 function 0 "Qumranet Virtio Storage" rev 0x00
>> vioblk0 at virtio1
>> scsibus1 at vioblk0: 2 targets
>> sd0 at scsibus1 targ 0 lun 0: <VirtIO, Block Device, >
>> sd0: 40960MB, 512 bytes/sector, 83886080 sectors
>> virtio1: msix shared
>> virtio2 at pci0 dev 5 function 0 "Qumranet Virtio Memory Balloon" rev 0x00
>> viomb0 at virtio2
>> virtio2: apic 0 int 10
>> isa0 at pcib0
>> isadma0 at isa0
>> fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
>> com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
>> com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
>> 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
>> usb0 at uhci0: USB revision 1.0
>> uhub0 at usb0 configuration 1 interface 0 "Intel UHCI root hub" rev
>> 1.00/1.00 addr 1
>> vmm0 at mainbus0: VMX/EPT (using slow L1TF mitigation)
>> uhidev0 at uhub0 port 1 configuration 1 interface 0 "QEMU QEMU USB
>> Tablet" rev 2.00/0.00 addr 2
>> uhidev0: iclass 3/0
>> ums0 at uhidev0: 3 buttons, Z dir
>> wsmouse1 at ums0 mux 0
>> vscsi0 at root
>> scsibus2 at vscsi0: 256 targets
>> softraid0 at root
>> scsibus3 at softraid0: 256 targets
>> root on sd0a (32f861a76884732c.a) swap on sd0b dump on sd0b
>> WARNING: / was not properly unmounted
>> fd0 at fdc0 drive 1: density unknown
>>
>> I can patch and test new kernel ( over stable not current ) for this
>> but it can takes *hours* before a problem can be triggers :-(
>>
>
> +0x24 is at /usr/src/sys/net/bridgectl.c:612
>
> SIMPLEQ_FOREACH(n, &bif->bif_brlout, brl_next) {
> total++;
> }
>
> bridge_brlconf():
> /usr/src/sys/net/bridgectl.c:611
> 1120: 4c 8b 1d 00 00 00 00 mov 0(%rip),%r11 #
> 1127 <bridge_brlconf+0x7>
> 1123: R_X86_64_PC32
> __retguard_2528+0xfffffffffffffffc
> 1127: 4c 33 1c 24 xor (%rsp),%r11
> 112b: 55 push %rbp
> 112c: 48 89 e5 mov %rsp,%rbp
> 112f: 57 push %rdi
> 1130: 56 push %rsi
> 1131: 41 53 push %r11
> 1133: 41 57 push %r15
> 1135: 41 56 push %r14
> 1137: 41 55 push %r13
> 1139: 41 54 push %r12
> 113b: 53 push %rbx
> 113c: 48 83 ec 30 sub $0x30,%rsp
> 1140: 48 89 75 b0 mov %rsi,0xffffffffffffffb0(%rbp)
> /usr/src/sys/net/bridgectl.c:612
> 1144: 48 8b 47 08 mov 0x8(%rdi),%rax
> 1148: 48 89 45 98 mov %rax,0xffffffffffffff98(%rbp)
> 114c: 48 89 7d b8 mov %rdi,0xffffffffffffffb8(%rbp)
> 1150: 48 8b 47 18 mov 0x18(%rdi),%rax
> 1154: 45 31 ed xor %r13d,%r13d
> /usr/src/sys/net/bridgectl.c:618
>
> --
> --
> ---------------------------------------------------------------------------------------------------------------------
> Knowing is not enough; we must apply. Willing is not enough; we must do
