panic: malloc(M_WAITOK) with sleeping prohibited

I just got this panic:

igb0: <Intel(R) PRO/1000 PCI-Express Network Driver> port 0xd020-0xd03f mem 0xfb320000-0xfb33ffff,0xfb344000-0xfb347fff irq 16 at device 0.0 on pci8
igb0: Using 1024 TX descriptors and 1024 RX descriptors
igb0: queue equality override not set, capping rx_queues at 6 and tx_queues at 6
igb0: Using 6 RX queues 6 TX queues
igb0: Using MSI-X interrupts with 7 vectors
igb0:
db>
db> show panic
panic: malloc(M_WAITOK) with sleeping prohibited
db> bt
Tracing pid 12 tid 100172 td 0xfffffe010dce2100
kdb_enter() at kdb_enter+0x37/frame 0xfffffe00e4f72980
vpanic() at vpanic+0x1b2/frame 0xfffffe00e4f729d0
panic() at panic+0x43/frame 0xfffffe00e4f72a30
malloc_dbg() at malloc_dbg+0xd4/frame 0xfffffe00e4f72a50
malloc() at malloc+0x34/frame 0xfffffe00e4f72ab0
linux_alloc_current() at linux_alloc_current+0x3d/frame 0xfffffe00e4f72b00
linux_irq_handler() at linux_irq_handler+0x3a/frame 0xfffffe00e4f72b20
ithread_loop() at ithread_loop+0x279/frame 0xfffffe00e4f72bb0
fork_exit() at fork_exit+0x80/frame 0xfffffe00e4f72bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00e4f72bf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
db> x/s version
version:        FreeBSD 14.0-CURRENT #0 main-n245371-ce53f92e6c81: Wed Mar 10 10:00:29 CET 2021\012    pho_at_mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO\012
db>

- Peter