I had a panic on a 6.1/amd64 system during the release of a number of fss(4) snapshots. Of course I cannot tell for sure the panic was caused by fssconfig -u, only it happened at that time:
uvm_fault(0xffffffff80724860, 0x0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8025cfbf cs 8 rflags 10283 cr2 8 cpl 0 rsp fffffe811d8be800 kernel: page fault trap, code=0 Stopped in pid 0,80 (system) at netbsd:mutex_vevtor_enter+0x80: movq 18(%r15),%rax show registers reveals r15 contains fffffffffffffff0. bt gives: mutex_vector_enter() at netbsd:mutex_vector_enter+0x80 genfs_do_putpages() at netbsd:genfs_do_putpages+0xb19 VOP_PUTPAGES at netbsd:VOP_PUTPAGES+0x3a uvm_pageout() at netbsd:uvm_pageout+0x20a (thats all manual OCR, of course.) I'm creating and destroying these snapshots daily (I hold them during backup), so it can't be a general problem related to snapshotting these file systems. Any clues?
