uvm_fault(0xfffffd805ff05a68, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at fifo_write+0x6e: movq 0x8(%rax),%r15 TID PID UID PRFLAGS PFLAGS CPU COMMAND 388556 63341 32767 0x10 0 0 syz-executor *273361 95930 32767 0x10 0x4000000 1K syz-executor fifo_write(ffff80002a07a880) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8051757b40,ffff80002a07a918,8,fffffd807f7d3270) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8051757b40,ffff80002a030800,208,0,1,a8045b85636cb0e4,ffff80002a07aa40,fffffd8051757b40,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a07aa40) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806089fc30,ffff80002a07abc0,ffff80002a07abf0,ffff80002a07aaf0,ffff80002a030800) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000371e99d0,20000340,ffffff9c,20000580) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a07ad70) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a07ad70) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f352ce320, count: 7 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 *cpu1: uvm_fault(0xfffffd805ff05a68, 0x8, 0, 1) -> e ddb{1}> trace fifo_write(ffff80002a07a880) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8051757b40,ffff80002a07a918,8,fffffd807f7d3270) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8051757b40,ffff80002a030800,208,0,1,a8045b85636cb0e4,ffff80002a07aa40,fffffd8051757b40,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a07aa40) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806089fc30,ffff80002a07abc0,ffff80002a07abf0,ffff80002a07aaf0,ffff80002a030800) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000371e99d0,20000340,ffffff9c,20000580) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a07ad70) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a07ad70) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f352ce320, count: -8 ddb{1}> show registers rdi 0xfffffd8051757b40 rsi 0x163c __ALIGN_SIZE+0x63c rbp 0xffff80002a07a870 rbx 0xfffffd8051757b40 rdx 0xffff80003534f000 rcx 0x163b __ALIGN_SIZE+0x63b rax 0 r8 0 r9 0x1 r10 0xffff800029b7bff0 r11 0xcbb6f0cbb397bfd0 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0xffff80002a07a918 r14 0xffff80002a07a880 r15 0x1 rip 0xffffffff828dc39e fifo_write+0x6e cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a07a840 ss 0 fifo_write+0x6e: movq 0x8(%rax),%r15 ddb{1}> show proc PROC (syz-executor) tid=273361 pid=95930 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=17, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000371cf978,0xffff8000371e8d38 process=0xffff800037205228 user=0xffff80002a075000, vmspace=0xfffffd805ff05a68 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 63341 388556 34298 32767 7 0x10 syz-executor 63341 503140 34298 32767 2 0x4000010 syz-executor 76988 192815 63685 32767 2 0x10 syz-executor 76988 422702 63685 32767 3 0x4000090 kqsel syz-executor 95930 256777 11031 32767 2 0x10 syz-executor 95930 357196 11031 32767 3 0x4000090 ttyin syz-executor *95930 273361 11031 32767 7 0x4000010 syz-executor 96229 253237 26129 32767 3 0x90 nanoslp syz-executor 96229 411172 26129 32767 3 0x4000090 sbwait syz-executor 96229 247077 26129 32767 3 0x4000090 fsleep syz-executor 22497 311086 47342 32767 2 0x10 syz-executor 47342 516441 70370 0 3 0x82 wait syz-executor 63685 499830 96211 32767 3 0x90 nanoslp syz-executor 96211 389280 70370 0 3 0x82 wait syz-executor 16693 20217 198 32767 3 0x90 nanoslp syz-executor 26129 129030 18244 32767 3 0x90 nanoslp syz-executor 34298 196217 90561 32767 3 0x90 nanoslp syz-executor 198 226854 70370 0 3 0x82 wait syz-executor 18244 250079 70370 0 3 0x82 wait syz-executor 5509 298043 63629 32767 3 0x90 nanoslp syz-executor 90561 491100 70370 0 3 0x82 wait syz-executor 53310 137788 65823 32767 2 0x90 syz-executor 63629 151783 70370 0 3 0x82 wait syz-executor 65823 312782 70370 0 3 0x82 wait syz-executor 11031 482834 43189 32767 3 0x90 nanoslp syz-executor 43189 28773 70370 0 3 0x82 wait syz-executor 80870 17461 24552 0 3 0x100082 sbwait arp 24552 134780 24927 0 3 0x10008a sigsusp sh 24927 84574 1 0 3 0x80 wait syz-executor 59243 401736 0 0 3 0x14200 bored sosplice 70370 22129 28679 0 3 0x82 kqread syz-executor 28679 111959 79964 0 3 0x10008a sigsusp ksh 79964 428331 29281 0 3 0x98 kqread sshd-session 29281 91962 33937 0 3 0x92 kqread sshd-session 20586 400056 1 0 3 0x100083 ttyin getty 33937 353045 1 0 3 0x88 kqread sshd 85914 509587 914 73 3 0x1100090 kqread syslogd 914 305396 1 0 3 0x100082 sbwait syslogd 72927 281938 1 0 3 0x100080 kqread resolvd 27548 189029 68394 77 3 0x100092 kqread dhcpleased 86121 503049 68394 77 3 0x100092 kqread dhcpleased 68394 140945 1 0 3 0x80 kqread dhcpleased 26539 378140 0 0 3 0x14200 bored smr 31338 329270 0 0 2 0x14200 zerothread 45075 175213 0 0 3 0x14200 aiodoned aiodoned 12208 336207 0 0 3 0x14200 syncer update 15549 238960 0 0 3 0x14200 cleaner cleaner 65637 336862 0 0 3 0x14200 reaper reaper 40410 31358 0 0 3 0x14200 pgdaemon pagedaemon 95865 434491 0 0 3 0x14200 bored viomb 14367 17518 0 0 3 0x40014200 acpi0 acpi0 99896 217202 0 0 3 0x40014200 idle1 25048 356224 0 0 3 0x14200 bored softnet3 71875 504178 0 0 3 0x14200 bored softnet2 27109 388477 0 0 3 0x14200 bored softnet1 39167 291127 0 0 3 0x14200 bored softnet0 70473 335854 0 0 3 0x14200 bored systqmp 45490 215240 0 0 3 0x14200 bored systq 99944 159967 0 0 3 0x14200 tmoslp softclockmp 91683 391851 0 0 3 0x40014200 tmoslp softclock 14436 464210 0 0 3 0x40014200 idle0 1 490265 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 95930 (syz-executor) thread 0xffff8000371e99d0 (273361) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835e5af0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 __mp_acquire_count+0x58 #2 mi_switch+0x658 sys/kern/sched_bsd.c:460 #3 sleep_finish+0x219 sys/kern/kern_synch.c:416 #4 biowait+0xc1 sys/kern/vfs_bio.c:1254 #5 bwrite+0x2e2 sys/kern/vfs_bio.c:766 #6 VOP_BWRITE+0x60 sys/kern/vfs_vops.c:646 #7 ufs_direnter+0x7d1 sys/ufs/ufs/ufs_lookup.c:833 #8 ufs_makeinode+0x51e sys/ufs/ufs/ufs_vnops.c:1764 #9 ufs_symlink+0x54 sys/ufs/ufs/ufs_vnops.c:1293 #10 VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 #11 dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 #12 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #12 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80513d4c50) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x171 sys/ufs/ufs/ufs_ihash.c:95 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #9 ufs_makeinode+0xcb sys/ufs/ufs/ufs_vnops.c:1728 #10 ufs_symlink+0x54 sys/ufs/ufs/ufs_vnops.c:1293 #11 VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 #12 dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 #13 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #13 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 Process 22497 (syz-executor) thread 0xffff8000371cfc00 (311086) exclusive rrwlock inode r = 0 (0xfffffd807d39d4e8) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x171 sys/ufs/ufs/ufs_ihash.c:95 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #13 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #13 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807d39df88) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #8 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #8 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 10029K 10036K 166960K 12117 0 pcb 17 14K 16K 166960K 19 0 rtable 240 6K 7K 166960K 8657 0 pf 31 16K 16K 166960K 590 0 ifaddr 42 11K 12K 166960K 1139 0 ifgroup 50 2K 2K 166960K 1157 0 sysctl 3 0K 4K 166960K 8 0 counters 64 36K 36K 166960K 612 0 ioctlops 0 0K 2K 166960K 349 0 iov 1 2K 20K 166960K 258 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1470 92K 92K 166960K 6921 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 67 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 163 0 dirhash 15 2K 3K 166960K 96 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 27 101K 169K 166960K 7810 0 sigio 0 0K 0K 166960K 96 0 proc 56 78K 176K 166960K 8442 0 subproc 117 7K 13K 166960K 4836 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 787 0 in_multi 99 7K 7K 166960K 3244 0 ether_multi 1 0K 0K 166960K 28 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 4552 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 269 83K 139K 166960K 54730 0 UVM aobj 131 6K 7K 166960K 138 0 pinsyscall 49 98K 134K 166960K 15830 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 247 0 NDP 13 0K 2K 166960K 839 0 temp 80 6824K 6949K 166960K 57127 0 kqueue 13 20K 38K 166960K 648 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 1056 0 1052 8 7 1 5 0 8 0 rtentry 112 3126 0 3013 11 7 4 4 0 8 0 unpcb 144 3873 0 3855 42 38 4 6 0 8 3 syncache 336 27 0 27 17 16 1 1 0 8 1 tcpqe 32 16 0 16 8 8 0 1 0 8 0 tcpcb 808 2265 0 2260 74 72 2 8 0 8 1 arp 120 564 0 546 1 0 1 1 0 8 0 ipq 40 28 0 26 2 1 1 1 0 8 0 ipqe 40 513 0 511 2 1 1 1 0 8 0 inpcb 336 6347 0 6337 87 80 7 10 0 8 5 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 2 0 2 1 1 0 1 0 8 0 nd6 136 871 0 844 1 0 1 1 0 8 0 kcovpl 48 372 0 363 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 12618 0 12154 165 136 29 30 0 8 0 art_table 32 12619 0 12154 7 3 4 4 0 8 0 art_node 16 3125 0 3022 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 19 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 161 0 151 1 0 1 1 0 8 0 shmpl 112 135 0 7 4 0 4 4 0 8 0 dirhash 1024 76 0 55 3 0 3 3 0 8 0 dino2pl 256 7201 0 4972 140 0 140 140 0 8 0 ffsino 272 7201 0 4972 150 1 149 149 0 8 0 nchpl 144 11823 0 9616 82 0 82 82 0 8 0 uvmvnodes 80 9336 0 0 191 0 191 191 0 8 0 vnodes 216 9336 0 0 519 0 519 519 0 8 0 namei 1024 67284 0 67283 42 41 1 3 0 8 0 percpumem 16 320 0 274 1 0 1 1 0 8 0 kstatmem 264 570 0 548 2 0 2 2 0 8 0 scxspl 216 137676 0 137676 41 38 3 8 1 8 3 plimitpl 152 1668 0 1641 2 0 2 2 0 8 0 sigapl 424 7353 0 7294 15 6 9 9 0 8 0 futexpl 64 46244 0 46243 24 23 1 1 0 8 0 knotepl 120 823 0 0 16 0 16 16 0 8 0 kqueuepl 216 1229 0 1219 11 9 2 5 0 8 1 pipepl 320 1800 0 1770 29 24 5 8 0 8 0 fdescpl 496 7334 0 7295 22 14 8 8 0 8 1 filepl 152 37285 0 37017 55 40 15 19 0 8 0 lockfpl 104 1274 0 1271 1 0 1 1 0 8 0 lockfspl 48 406 0 403 1 0 1 1 0 8 0 sessionpl 144 292 0 275 1 0 1 1 0 8 0 pgrppl 48 788 0 763 1 0 1 1 0 8 0 ucredpl 104 6447 0 6428 1 0 1 1 0 8 0 zombiepl 144 7297 0 7294 1 0 1 1 0 8 0 processpl 1160 7353 0 7294 13 7 6 6 0 8 0 procpl 648 12707 0 12642 17 10 7 7 0 8 0 srpgc 96 16 0 16 8 8 0 1 0 8 0 sosppl 168 28 0 28 15 14 1 1 0 8 1 sockpl 664 11381 0 11349 133 124 9 20 0 8 5 mcl64k 65536 21 0 0 3 0 3 3 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 12 0 0 2 0 2 2 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 455 0 0 26 4 22 26 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 931 0 0 27 0 27 27 0 8 0 bufpl 280 15281 0 5945 667 0 667 667 0 8 0 anonpl 24 959391 0 954808 199 126 73 97 0 185 24 amapchunkpl 152 174578 0 173936 116 75 41 50 0 158 11 amappl16 200 14261 0 14243 185 175 10 24 0 8 8 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 646 0 635 1 0 1 1 0 8 0 amappl13 176 10 0 10 5 4 1 1 0 8 1 amappl12 168 12331 0 12291 13 10 3 3 0 8 0 amappl11 160 52 0 42 1 0 1 1 0 8 0 amappl10 152 10 0 8 1 0 1 1 0 8 0 amappl9 144 147 0 146 2 1 1 1 0 8 0 amappl8 136 28 0 26 1 0 1 1 0 8 0 amappl7 128 635 0 623 1 0 1 1 0 8 0 amappl6 120 2865 0 2862 1 0 1 1 0 8 0 amappl5 112 1206 0 1196 1 0 1 1 0 8 0 amappl4 104 1093 0 1074 1 0 1 1 0 8 0 amappl3 96 29247 0 29133 8 4 4 4 0 8 0 amappl2 88 8116 0 8032 3 0 3 3 0 8 0 amappl1 80 46203 0 45632 24 10 14 15 0 8 0 amappl 88 52176 0 51966 9 3 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 72 137 0 7 3 0 3 3 0 8 0 uaddrrnd 24 7335 0 7296 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7335 0 7296 1 0 1 1 0 8 0 vmmpekpl 168 60929 0 60866 7 2 5 5 0 8 0 vmmpepl 168 443846 0 441750 232 116 116 116 0 357 15 vmsppl 440 7334 0 7296 14 7 7 7 0 8 1 rwobjpl 56 124930 0 114536 168 16 152 152 0 8 2 pdppl 4096 14677 0 14592 959 868 91 119 0 8 6 pvpl 32 46872 0 0 376 0 376 376 0 265 0 pmappl 248 7334 0 7296 7 3 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1701 0 1220 15 0 15 15 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83426ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff835e58e8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835e58e8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7a0d430ee610, count: 9 ddb{0}> trace x86_ipi_db(ffffffff83426ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff835e58e8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835e58e8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7a0d430ee610, count: -6 ddb{0}> machine ddbcpu 1 Stopped at fifo_write+0x6e: movq 0x8(%rax),%r15 fifo_write(ffff80002a07a880) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8051757b40,ffff80002a07a918,8,fffffd807f7d3270) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8051757b40,ffff80002a030800,208,0,1,a8045b85636cb0e4,ffff80002a07aa40,fffffd8051757b40,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a07aa40) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806089fc30,ffff80002a07abc0,ffff80002a07abf0,ffff80002a07aaf0,ffff80002a030800) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000371e99d0,20000340,ffffff9c,20000580) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a07ad70) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a07ad70) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f352ce320, count: 7 ddb{1}> trace fifo_write(ffff80002a07a880) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd8051757b40,ffff80002a07a918,8,fffffd807f7d3270) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8051757b40,ffff80002a030800,208,0,1,a8045b85636cb0e4,ffff80002a07aa40,fffffd8051757b40,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a07aa40) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806089fc30,ffff80002a07abc0,ffff80002a07abf0,ffff80002a07aaf0,ffff80002a030800) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000371e99d0,20000340,ffffff9c,20000580) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a07ad70) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a07ad70) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f352ce320, count: -8