https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283815
Bug ID: 283815
Summary: 'sysctl -a' hangs indefinitely
Product: Base System
Version: 14.2-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 256370
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=256370&action=edit
/var/run/dmesg.boot (verbose)
After upgrading to 14.2R from 14.1R, I noticed that listing all sysctls doesn't
work anymore. It stops here:
<CUT>
dev.ahci.%parent:
dev.vgapci.1.%iommu: rid=0x10
dev.vgapci.1.%parent: pci0
dev.vgapci.1.%pnpinfo: vendor=0x8086 device=0x591b subvendor=0x1028
subdevice=0x07b1 class=0x030000
dev.vgapci.1.%location: slot=2 function=0 dbsf=pci0:0:2:0
handle=\_SB_.PCI0.GFX0
dev.vgapci.1.%driver: vgapci
dev.vgapci.1.%desc: VGA-compatible display
dev.vgapci.0.wake: 0
^C^C^C
Process enters R+, eats 100% CPU and becomes unkillable:
jason@jnb: [?:0] ~ $ ps auwwx | grep '[s]ysctl'
jason 25384 100.0 0.0 16888 4880 6 R+ 15:00 0:49.15 sysctl
-a
jason@jnb: [?:0] ~ $ kill -9 25384
jason@jnb: [?:0] ~ $ ps auwwx | grep '[s]ysctl'
jason 25384 100.0 0.0 16888 4880 6 R+ 15:00 3:19.35 sysctl
-a
jason@jnb: [?:0] ~ $ procstat -kk 25384
PID TID COMM TDNAME KSTACK
25384 101712 sysctl - pci_find_cap_method+0x11a
iommu_get_requester+0x192 device_sysctl_handler+0x216
sysctl_root_handler_locked+0x8a sysctl_root+0x1fa userland_sysctl+0x115
sys___sysctl+0x60 amd64_syscall+0xed fast_syscall_common+0xf8
In this state, subsequent 'sysctl kern.geom' works fine, while 'sysctl dev.cpu'
also hangs:
jason@jnb: [?:0] ~ $ ps auwwx | grep '[s]ysctl'
jason 25436 100.0 0.0 13816 2236 5 R+ 15:05 1:30.48 sysctl
dev.cpu
jason 25384 100.0 0.0 16888 4880 6 R+ 15:00 6:31.35 sysctl
-a
jason@jnb: [?:0] ~ $ procstat -kk 25436 25384
PID TID COMM TDNAME KSTACK
25436 101172 sysctl -
sysctl_root_handler_locked+0x143 sysctl_root+0x1fa userland_sysctl+0x115
sys___sysctl+0x60 amd64_syscall+0xed fast_syscall_common+0xf8
25384 101712 sysctl - pci_find_cap_method+0x17a
iommu_get_requester+0x192 device_sysctl_handler+0x216
sysctl_root_handler_locked+0x8a sysctl_root+0x1fa userland_sysctl+0x115
sys___sysctl+0x60 amd64_syscall+0xed fast_syscall_common+0xf8
jason@jnb: [?:0] ~ $
No changes have been made to system configuration during upgrade.
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