Re: bridge/igb panic: sleepq_add: td 0xfffffe01bbce5300 to sleep on wchan 0xffffffff8157d9a0 with sleeping prohibited

xtouqh_at_mm.st wrote:
> Updating from latest CURRENT snapshot 
> (FreeBSD-13.0-CURRENT-amd64-20200910-1544934ffb2) to r365620 broke the 
> bridges with igb (I350-T2) for me.  Booting to kernel.old and/or 
> commenting the entries in rc.conf helps.
> 
> rc.conf:
> ----
> cloned_interfaces="bridge0 bridge1 tap0 tap1 tap2 tap3"
> ifconfig_em0="inet ..."
> ifconfig_igb0="up"
> ifconfig_igb1="up"
> ifconfig_bridge0="addm igb0 addm tap0 addm tap1"
> ifconfig_bridge1="addm igb1 addm tap2 addm tap3"
> ----
> 
> NICs (em0 is on-board, igb0/igb1 is addon I350-T2 card):
> ----
> em0: <Intel(R) PRO/1000 Network Connection> mem 0x92d00000-0x92d1ffff at 
> device 31.6 numa-domain 0 on pci0
> em0: Using 1024 TX descriptors and 1024 RX descriptors
> em0: Using an MSI interrupt
> em0: Ethernet address: e0:d5:5e:6c:aa:36
> em0: netmap queues/slots: TX 1/1024, RX 1/1024
> igb0: <Intel(R) PRO/1000 PCI-Express Network Driver> mem 
> 0xfbb00000-0xfbbfffff,0xfbc84000-0xfbc87fff at device 0.0 numa-domain 0 
> on pci16
> igb0: Using 1024 TX descriptors and 1024 RX descriptors
> igb0: Using 8 RX queues 8 TX queues
> igb0: Using MSI-X interrupts with 9 vectors
> igb0: Ethernet address: a0:36:9f:0a:cf:42
> igb0: netmap queues/slots: TX 8/1024, RX 8/1024
> igb1: <Intel(R) PRO/1000 PCI-Express Network Driver> mem 
> 0xfba00000-0xfbafffff,0xfbc80000-0xfbc83fff at device 0.1 numa-domain 0 
> on pci16
> igb1: Using 1024 TX descriptors and 1024 RX descriptors
> igb1: Using 8 RX queues 8 TX queues
> igb1: Using MSI-X interrupts with 9 vectors
> igb1: Ethernet address: a0:36:9f:0a:cf:43
> igb1: netmap queues/slots: TX 8/1024, RX 8/1024
> ----
> 
> panic:
> ----
> panic: sleepq_add: td 0xfffffe01bbce5300 to sleep on wchan 
> 0xffffffff8157d9a0 with sleeping prohibited
> cpuid = 16
> time = 1599808542
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 
> 0xfffffe01ba658c40
> vpanic() at vpanic+0x182/frame 0xfffffe01ba658c90
> panic() at panic+0x43/frame 0xfffffe01ba658cf0
> sleepq_add() at sleepq_add+0x359/frame 0xfffffe01ba658d40
> _sleep() at _sleep+0x20c/frame 0xfffffe01ba658df0
> pause_sbt() at pause_sbt+0xfe/frame 0xfffffe01ba658e20
> e1000_reset_hw_82580() at e1000_reset_hw_82580+0x1c8/frame 
> 0xfffffe01ba658e60
> em_if_stop() at em_if_stop+0x1b/frame 0xfffffe01ba658e80
> iflib_stop() at iflib_stop+0xbd/frame 0xfffffe01ba658ed0
> iflib_if_ioctl() at iflib_if_ioctl+0x397/frame 0xfffffe01ba658f40
> bridge_mutecaps() at bridge_mutecaps+0x145/frame 0xfffffe01ba658fb0
> bridge_ioctl_add() at bridge_ioctl_add+0x468/frame 0xfffffe01ba659000
> bridge_ioctl() at bridge_ioctl+0x32b/frame 0xfffffe01ba6590d0
> in_control() at in_control+0x322/frame 0xfffffe01ba659180
> ifioctl() at ifioctl+0x3e8/frame 0xfffffe01ba659250
> kern_ioctl() at kern_ioctl+0x28e/frame 0xfffffe01ba6592c0
> sys_ioctl() at sys_ioctl+0x127/frame 0xfffffe01ba659390
> amd64_syscall() at amd64_syscall+0x140/frame 0xfffffe01ba6594b0
> fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe01ba6594b0
> --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x8004b4aba, rsp = 
> 0x7fffffffe2b8, rbp = 0x7fffffffe360 ---
> Uptime: 14s
> Dumping 3794 out of 97961 
> MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%
> ----

Gleb, is this result of r365504?  If yes, what are the possible fixes?