[ 11051.0135270] cpu5[5936 umount]: hogging kernel lock
[ 11051.0135270] trace fp ffffc00165877590
[ 11051.0135270] fp ffffc001658775a0 ipi_msg_cpu_handler() at ffffc00000559d58 netbsd:ipi_msg_cpu_handler+0x78
[ 11051.0235276] fp ffffc00165877610 ipi_cpu_handler() at ffffc0000055a2ac netbsd:ipi_cpu_handler+0xcc
[ 11051.0235276] fp ffffc00165877670 pic_ipi_generic() at ffffc000000022a8 netbsd:pic_ipi_generic+0x8
[ 11051.0235276] fp ffffc00165877690 pic_dispatch() at ffffc0000000289c netbsd:pic_dispatch+0x3c
[ 11051.0235276] fp ffffc001658776d0 gicv3_irq_handler() ad:vfs_vnode_iterator_next1+0x15c
[ 11051.0435295] fp ffffc00165877b40 vflush() at ffffc000005c9a38 netbsd:vflush+0x88
[ 11051.0435295] fp ffffc00165877c70 ffs_flushfiles() at ffffc0000049e39c netbsd:ffs_flushfiles+0x7c
[ 11051.0435295] fp ffffc00165877cb0 ffs_unmount() at ffffc0000049edbc netbsd:ffs_unmount+0x4c
[ 11051.0435295] fp ffffc00165877cf0 VFS_UNMOUNT() at ffffc000005cdc7c netbsd:VFS_UNMOUNT+0x2c
[ 11051.0435295] fp ffffc00165877d10 dounmount() at ffffc000005cafc0 netbsd:dounmount+0x80
[ 11051.0435295] fp ffffc00165877d60 sys_unmount() at ffffc000005d0b78 netbsd:sys_unmount+0xd8
[ 11051.0535276] fp ffffc00165877e20 syscall() at ffffc000000b4efc netbsd:syscall+0x19c
[ 11051.0535276] tf ffffc00165877ed0 el0_trap() at ffffc000000b7ff0 netbsd:el280] Kernel lock error: _kernel_lock,265: spinout

[ 11051.0635280] lock address : netbsd:kernel_lock
[ 11051.0635280] type         : spin
[ 11051.0635280] initialized  : netbsd:main+0xa4
[ 11051.0635280] shared holds :                  0 exclusive:                  1
[ 11051.0635280] shares wanted:                  0 exclusive:                  5
[ 11051.0635280] relevant cpu :                  1 last held:                  5
[ 11051.0635280] relevant lwp : 0xffff0000322ad580 last held: 0xffff00000281d580
[ 11051.0635280] last locked* : netbsd:vflush+0xec
[ 11051.0735272] unlocked     : netbsd:VOP_LOCK+0x104
[ 11051.0735272] curcpu holds :                  0 wanted by: 0xffff0000322ad580

[ 11051.0735272] panic: LOCKDEBUG: Kernel lock error: _kernel_lock,265: spinout
[ 11051.0735272] cpu1: Begin traceback...
[ 11051.0735272] trace fp ffffc00165d5f910
[ 11051.0735272] fp ffffc00165d5f940 vpanic() at ffffc0000056c8d8 netbsd:vpanic+0x178
[ 11051.0735272] fp ffffc00165d5f9a0 panic() at ffffc0000056c9e4 netbsd:panic+0x44
[ 11051.0735272] fp ffffc00165d5fa30 lockdebug_abort1() at ffffc0000055f6ec netbsd:lockdebug_abort1+0xec
[ 11051.0835278] fp ffffc00165d5fa80 _kernel_lock() at ffffc0000050ca90 netbsd:_kernel_lock+0x2d0
[ 11051.0835278] fp ffffc00165d5fb20 VOP_POLL() at ffffc000005e80e4 netbsd:VOP_POLL+0x84
[ 11051.0835278] fp ffffc00165d5fb70 sel_do_scan() at ffffc00000588390 netbsd:sel_do_scan+0x300
[ 11051.0935276] fp ffffc00165d5fc90 selcommon() at ffffc000005netbsd:selcommon+0x118
[ 11051.0935276] fp ffffc00165d5fde0 sys___select50() at ffffc00000588a6