panic: vop_geneWARNING: SPL NOT LOWERED ON TRAP EXIT a 0 Stopped at proc_trampoline+0xd6: movl $0,%gs:0x540 TID PID UID PRFLAGS PFLAGS CPU COMMAND *251121 16216 32767 0x10 0 1 syz-executor.7 451051 84984 32767 0x10 0 0 syz-executor.2 proc_trampoline() at proc_trampoline+0xd6 end of kernel end trace frame: 0x7f7ffffd8be0, count: 14 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu0: vop_generic_badop ddb{1}> trace proc_trampoline() at proc_trampoline+0xd6 end of kernel end trace frame: 0x7f7ffffd8be0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800026180df0 rbx 0 rdx 0 rcx 0 rax 0x2a r8 0xffff800026180d20 r9 0 r10 0x6048dd88ab0d140d r11 0x5c2b906eaa8a2e76 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff814964e6 proc_trampoline+0xd6 cs 0x8 rflags 0x246 rsp 0xffff800026180d70 ss 0 proc_trampoline+0xd6: movl $0,%gs:0x540 ddb{1}> show proc PROC (syz-executor.7) pid=251121 stat=onproc flags process=10 proc=0 pri=67, usrpri=67, nice=20 forw=0xffffffffffffffff, list=0xffff8000261e9270,0xffffffff82bb14d0 process=0xffff8000261e7258 user=0xffff80002617b000, vmspace=0xfffffd806a157b98 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *16216 251121 83599 32767 7 0x10 syz-executor.7 44077 397788 40569 32767 2 0x10 syz-executor.4 44077 125013 40569 32767 3 0x4000090 pipewr syz-executor.4 44077 452110 40569 32767 3 0x4000090 fsleep syz-executor.4 40569 220168 17621 32767 3 0x90 nanoslp syz-executor.4 17621 51522 21277 0 3 0x82 wait syz-executor.4 83599 110081 24580 32767 3 0x90 nanoslp syz-executor.7 24580 142024 21277 0 3 0x82 wait syz-executor.7 54572 429042 14667 32767 2 0x10 syz-executor.1 14667 145662 21277 0 3 0x82 wait syz-executor.1 74597 521730 69590 32767 3 0x90 nanoslp syz-executor.3 69590 377702 21277 0 3 0x82 wait syz-executor.3 84984 451051 51443 32767 7 0x10 syz-executor.2 51443 479727 21277 0 3 0x82 wait syz-executor.2 32291 220219 42951 32767 3 0x90 piperd syz-executor.0 42951 141689 21277 0 3 0x82 wait syz-executor.0 47871 395136 47939 32767 3 0x90 nanoslp syz-executor.6 47939 5031 21277 0 3 0x82 wait syz-executor.6 5726 405777 110 32767 3 0x90 piperd syz-executor.5 110 217191 21277 0 3 0x82 wait syz-executor.5 64291 451215 0 0 3 0x14200 bored sosplice 21277 268420 85627 0 3 0x82 wait syz-fuzzer 21277 419089 85627 0 3 0x4000082 nanoslp syz-fuzzer 21277 447734 85627 0 3 0x4000082 thrsleep syz-fuzzer 21277 148192 85627 0 3 0x4000082 thrsleep syz-fuzzer 21277 437441 85627 0 3 0x4000082 wait syz-fuzzer 21277 76093 85627 0 2 0x4000002 syz-fuzzer 21277 387236 85627 0 3 0x4000082 thrsleep syz-fuzzer 21277 371968 85627 0 3 0x4000082 wait syz-fuzzer 21277 168336 85627 0 3 0x4000082 thrsleep syz-fuzzer 21277 246591 85627 0 3 0x4000082 wait syz-fuzzer 21277 378986 85627 0 3 0x4000082 wait syz-fuzzer 21277 261372 85627 0 3 0x4000082 thrsleep syz-fuzzer 21277 285087 85627 0 3 0x4000082 wait syz-fuzzer 21277 184179 85627 0 2 0x4000002 syz-fuzzer 21277 216330 85627 0 3 0x4000082 wait syz-fuzzer 21277 240978 85627 0 3 0x4000082 wait syz-fuzzer 85627 307684 95471 0 3 0x10008a sigsusp ksh 95471 250512 60755 0 3 0x9a kqread sshd 65458 465744 1 0 3 0x100083 ttyin getty 60755 362542 1 0 3 0x88 kqread sshd 77920 54174 33574 73 3 0x1100090 kqread syslogd 33574 321848 1 0 3 0x100082 netio syslogd 93482 399146 1 0 3 0x100080 kqread resolvd 61256 176607 91515 77 3 0x100092 kqread dhcpleased 16575 510710 91515 77 3 0x100092 kqread dhcpleased 91515 479839 1 0 3 0x80 kqread dhcpleased 75870 246294 0 0 3 0x14200 bored smr 85294 480687 0 0 2 0x14200 zerothread 2290 135887 0 0 3 0x14200 aiodoned aiodoned 71207 253860 0 0 3 0x14200 syncer update 3264 77381 0 0 3 0x14200 cleaner cleaner 10616 241771 0 0 3 0x14200 reaper reaper 96479 412205 0 0 3 0x14200 pgdaemon pagedaemon 81647 357952 0 0 3 0x14200 bored viomb 64125 290226 0 0 3 0x40014200 acpi0 acpi0 37477 241002 0 0 3 0x40014200 idle1 23879 435957 0 0 3 0x14200 bored softnet 25993 330071 0 0 3 0x14200 bored softnet 87045 286713 0 0 3 0x14200 bored softnet 73058 156006 0 0 3 0x14200 bored softnet 97311 471863 0 0 3 0x14200 bored systqmp 69924 504626 0 0 3 0x14200 bored systq 79151 186279 0 0 3 0x40014200 bored softclock 9896 366279 0 0 3 0x40014200 idle0 1 250862 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex pvpl r = 0 (0xffffffff82b03650) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_get+0xbd sys/kern/subr_pool.c:579 #4 pmap_enter+0x174 sys/arch/amd64/amd64/pmap.c:2687 #5 uvm_fault_lower+0x77c sys/uvm/uvm_fault.c:1506 #6 uvm_fault+0x238 #7 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #8 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #9 recall_trap+0x8 Process 16216 (syz-executor.7) thread 0xffff8000261e9cf0 (251121) exclusive rwlock amaplk r = 0 (0xfffffd8067bbc478) #0 witness_lock+0x44d #1 uvm_fault_check+0x419 sys/uvm/uvm_fault.c:783 #2 uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 #3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #4 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806a157c40) #0 witness_lock+0x44d #1 uvmfault_lookup+0xc9 sys/uvm/uvm_fault.c:1773 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:673 #3 uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #6 recall_trap+0x8 exclusive mutex pvpl r = 0 (0xffffffff82b03650) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_get+0xbd sys/kern/subr_pool.c:579 #4 pmap_enter+0x174 sys/arch/amd64/amd64/pmap.c:2687 #5 uvm_fault_lower+0x77c sys/uvm/uvm_fault.c:1506 #6 uvm_fault+0x238 #7 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #8 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #9 recall_trap+0x8 Process 84984 (syz-executor.2) thread 0xffff8000ffff2a80 (451051) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82bb5c58) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3bb sys/kern/sched_bsd.c:415 #3 sleep_finish+0x180 sys/kern/kern_synch.c:417 #4 tsleep+0x12c sys/kern/kern_synch.c:155 #5 biowait+0x91 sys/kern/vfs_bio.c:1268 #6 bwrite+0x21b sys/kern/vfs_bio.c:769 #7 ffs_update+0x27d sys/ufs/ffs/ffs_inode.c:113 #8 ufs_mkdir+0x662 sys/ufs/ufs/ufs_vnops.c:1220 #9 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 #10 domkdirat+0x121 sys/kern/vfs_syscalls.c:3112 #11 syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] #11 syscall+0x438 sys/arch/amd64/amd64/trap.c:599 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806bc95a28) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x1fc sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1324 #8 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #9 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1150 #10 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 #11 domkdirat+0x121 sys/kern/vfs_syscalls.c:3112 #12 syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] #12 syscall+0x438 sys/arch/amd64/amd64/trap.c:599 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80087d5c50) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:412 #6 namei+0x36a sys/kern/vfs_lookup.c:244 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3097 #8 syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] #8 syscall+0x438 sys/arch/amd64/amd64/trap.c:599 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10210 6411K 6420K 78643K 11358 0 pcb 13 16K 18K 78643K 19 0 rtable 238 6K 7K 78643K 1257 0 ifaddr 71 16K 16K 78643K 189 0 sysctl 3 1K 2K 78643K 70 0 counters 60 35K 35K 78643K 98 0 ioctlops 0 0K 2K 78643K 76 0 iov 0 0K 28K 78643K 1453 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1272 80K 80K 78643K 3145 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 54 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 1414 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 21 77K 125K 78643K 5812 0 sigio 0 0K 0K 78643K 33 0 proc 56 78K 127K 78643K 1358 0 subproc 104 6K 6K 78643K 351 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1185 0 in_multi 99 6K 6K 78643K 379 0 ether_multi 1 0K 0K 78643K 25 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 169 758K 758K 78643K 169 0 exec 0 0K 1K 78643K 1287 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 378 95K 990K 78643K 42400 0 UVM aobj 131 6K 6K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 777 0 NDP 11 0K 2K 78643K 84 0 temp 124 4694K 4818K 78643K 19164 0 kqueue 12 18K 26K 78643K 592 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 623 0 620 10 9 1 3 0 8 0 rtentry 112 334 0 222 4 0 4 4 0 8 0 unpcb 144 6280 0 6260 56 55 1 10 0 8 0 syncache 296 72 0 72 10 10 0 1 0 8 0 tcpqe 32 131 0 131 9 9 0 1 0 8 0 tcpcb 776 4654 0 4650 78 70 8 14 0 8 7 arp 120 60 0 41 1 0 1 1 0 8 0 ipq 40 8 0 7 3 2 1 1 0 8 0 ipqe 40 22 0 21 3 2 1 1 0 8 0 inpcb 368 11397 0 11384 134 125 9 20 0 8 7 nd6 48 91 0 66 1 0 1 1 0 8 0 kcovpl 48 27 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1338 0 879 32 3 29 30 0 8 0 art_table 32 1339 0 879 4 0 4 4 0 8 0 art_node 16 333 0 231 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semapl 112 1412 0 1402 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 9465 0 8032 90 0 90 90 0 8 0 ffsino 272 9465 0 8032 96 0 96 96 0 8 0 nchpl 144 17187 0 15558 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 64178 0 64177 5 4 1 2 0 8 0 percpumem 16 61 0 19 1 0 1 1 0 8 0 kstatmem 264 60 0 38 2 0 2 2 0 8 0 scxspl 216 50459 0 50459 31 30 1 8 0 8 1 plimitpl 152 937 0 914 13 12 1 2 0 8 0 sigapl 424 6069 0 6018 7 0 7 7 0 8 0 futexpl 64 53328 0 53327 3 2 1 1 0 8 0 knotepl 120 525 0 0 15 0 15 15 0 8 0 kqueuepl 216 1941 0 1931 28 27 1 6 0 8 0 pipepl 320 1712 0 1676 38 34 4 9 0 8 1 fdescpl 496 6051 0 6019 7 2 5 6 0 8 0 filepl 152 51999 0 51735 107 93 14 25 0 8 3 lockfpl 104 1399 0 1397 1 0 1 1 0 8 0 lockfspl 48 332 0 330 1 0 1 1 0 8 0 sessionpl 144 42 0 26 1 0 1 1 0 8 0 pgrppl 48 104 0 88 1 0 1 1 0 8 0 ucredpl 104 9228 0 9210 1 0 1 1 0 8 0 zombiepl 144 6020 0 6018 1 0 1 1 0 8 0 processpl 1072 6069 0 6018 5 1 4 5 0 8 0 procpl 672 17167 0 17099 17 9 8 8 0 8 1 sosppl 168 110 0 110 8 8 0 1 0 8 0 sockpl 488 18618 0 18588 378 368 10 35 0 8 5 mcl64k 65536 26 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 15 0 0 2 0 2 2 0 8 0 mcl8k 8192 19 0 0 3 1 2 3 0 8 0 mcl4k 4096 41 0 0 4 1 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 357 0 0 41 5 36 41 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1263 0 0 67 0 67 67 0 8 0 bufpl 288 13459 0 7128 453 0 453 453 0 8 0 anonpl 24 1340706 0 1325138 197 97 100 129 0 186 0 amapchunkpl 152 350857 0 350099 4473 4347 126 4424 0 158 91 amappl16 200 17793 0 17344 134 110 24 34 0 8 0 amappl15 192 23 0 22 1 0 1 1 0 8 0 amappl14 184 216 0 202 2 0 2 2 0 8 0 amappl13 176 4 0 3 1 0 1 1 0 8 0 amappl12 168 643 0 638 1 0 1 1 0 8 0 amappl11 160 57 0 45 1 0 1 1 0 8 0 amappl10 152 63 0 50 1 0 1 1 0 8 0 amappl9 144 985 0 984 1 0 1 1 0 8 0 amappl8 136 462 0 355 4 0 4 4 0 8 0 amappl7 128 198 0 174 2 1 1 2 0 8 0 amappl6 120 281 0 266 1 0 1 1 0 8 0 amappl5 112 286 0 280 1 0 1 1 0 8 0 amappl4 104 793 0 765 2 1 1 2 0 8 0 amappl3 96 17998 0 17942 2 0 2 2 0 8 0 amappl2 88 6797 0 6721 3 1 2 3 0 8 0 amappl1 80 139870 0 139136 23 5 18 22 0 8 0 amappl 88 41450 0 41237 6 0 6 6 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 6051 0 6019 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6051 0 6019 1 0 1 1 0 8 0 vmmpekpl 168 54669 0 54605 4 0 4 4 0 8 0 vmmpepl 168 573142 0 570367 232 97 135 153 0 357 1 vmsppl 368 6050 0 6019 4 0 4 4 0 8 0 rwobjpl 56 162109 0 154453 118 9 109 112 0 8 0 pdppl 4096 12109 0 12038 325 244 81 95 0 8 10 pvpl 32 2676216 0 2654444 381 190 191 269 0 265 6 pmappl 248 6050 0 6019 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1267 0 385 26 0 26 26 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff829c5ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82bb5a50) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82bb5a50) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f cnputc(65) at cnputc+0x4b sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1064 db_printf(ffffffff8262765d) at db_printf+0x85 sys/kern/subr_prf.c:498 panic(ffffffff8259f89f) at panic+0xd7 sys/kern/subr_prf.c:216 vop_generic_badop(ffff80002e490628) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd8059f5ea28,fffffd80679ec7f0) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:628 bwrite(fffffd80679ec7f0) at bwrite+0x1f0 sys/kern/vfs_bio.c:760 end trace frame: 0xffff80002e490710, count: 0 ddb{0}> trace x86_ipi_db(ffffffff829c5ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82bb5a50) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82bb5a50) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f cnputc(65) at cnputc+0x4b sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1064 db_printf(ffffffff8262765d) at db_printf+0x85 sys/kern/subr_prf.c:498 panic(ffffffff8259f89f) at panic+0xd7 sys/kern/subr_prf.c:216 vop_generic_badop(ffff80002e490628) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133 VOP_STRATEGY(fffffd8059f5ea28,fffffd80679ec7f0) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:628 bwrite(fffffd80679ec7f0) at bwrite+0x1f0 sys/kern/vfs_bio.c:760 VOP_BWRITE(fffffd80679ec7f0) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:640 ufs_mkdir(ffff80002e4908c0) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1236 VOP_MKDIR(fffffd8066cc3468,ffff80002e490a20,ffff80002e490a50,ffff80002e490950) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388 domkdirat(ffff8000ffff2a80,ffffff9c,7f7ffffc8460,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3112 syscall(ffff80002e490bd0) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e490bd0) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc84d0, count: -20 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xd6: movl $0,%gs:0x540 proc_trampoline() at proc_trampoline+0xd6 end of kernel end trace frame: 0x7f7ffffd8be0, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xd6 end of kernel end trace frame: 0x7f7ffffd8be0, count: -1