uvm_fault(0xfffffd80728501c0, 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 75022 14774 32767 0x10 0 0 syz-executor *477470 47645 32767 0x10 0x4000000 1K syz-executor fifo_write(ffff80002a0c6970) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd806c22a2c8,ffff80002a0c6a08,8,fffffd807f7d3478) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c22a2c8,ffff800029fe6000,fe,0,1,b2caafef8eba27c4,ffff80002a0c6b30,fffffd806c22a2c8,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a0c6b30) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806c78e1e8,ffff80002a0c6cb0,ffff80002a0c6ce0,ffff80002a0c6be0,ffff800029fe6000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000371c0538,20000700,4,20000200) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a0c6e60) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0c6e60) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ea446d1fd0, 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(0xfffffd80728501c0, 0x8, 0, 1) -> e ddb{1}> trace fifo_write(ffff80002a0c6970) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd806c22a2c8,ffff80002a0c6a08,8,fffffd807f7d3478) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c22a2c8,ffff800029fe6000,fe,0,1,b2caafef8eba27c4,ffff80002a0c6b30,fffffd806c22a2c8,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a0c6b30) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806c78e1e8,ffff80002a0c6cb0,ffff80002a0c6ce0,ffff80002a0c6be0,ffff800029fe6000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000371c0538,20000700,4,20000200) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a0c6e60) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0c6e60) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ea446d1fd0, count: -8 ddb{1}> show registers rdi 0xfffffd806c22a2c8 rsi 0x2a1b __ALIGN_SIZE+0x1a1b rbp 0xffff80002a0c6960 rbx 0xfffffd806c22a2c8 rdx 0xffff80003a7e6000 rcx 0x2a1a __ALIGN_SIZE+0x1a1a rax 0 r8 0 r9 0x1 r10 0xffff800029b7bff0 r11 0x187298dba26160e1 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0xffff80002a0c6a08 r14 0xffff80002a0c6970 r15 0x1 rip 0xffffffff8299c29e fifo_write+0x6e cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a0c6930 ss 0 fifo_write+0x6e: movq 0x8(%rax),%r15 ddb{1}> show proc PROC (syz-executor) tid=477470 pid=47645 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=17, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff6f68,0xffff8000ffff7200 process=0xffff8000fffed240 user=0xffff80002a0c1000, vmspace=0xfffffd80728501c0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27094 251341 2857 32767 2 0x10 syz-executor 14774 75022 37604 32767 7 0x10 syz-executor 14774 154115 37604 32767 3 0x4000090 kqsel syz-executor 14774 513006 37604 32767 3 0x4000090 fsleep syz-executor 16360 42089 43891 32767 2 0x10 syz-executor 16360 453469 43891 32767 3 0x4000090 fsleep syz-executor 47645 381496 19272 32767 2 0x10 syz-executor *47645 477470 19272 32767 7 0x4000010 syz-executor 68269 157117 85581 32767 2 0x10 syz-executor 68269 479158 85581 32767 3 0x4000090 fsleep syz-executor 68269 79614 85581 32767 2 0x4000010 syz-executor 5674 220839 20208 32767 3 0x90 nanoslp syz-executor 5674 449531 20208 32767 3 0x4000090 netacc syz-executor 5674 406711 20208 32767 3 0x4000090 fsleep syz-executor 5674 86327 20208 32767 3 0x4000090 fsleep syz-executor 24776 340396 6281 32767 3 0x10 biowait syz-executor 6281 117195 85227 0 3 0x82 wait syz-executor 37604 39472 81130 32767 3 0x90 nanoslp syz-executor 19272 514194 40333 32767 3 0x90 nanoslp syz-executor 11919 152792 18230 32767 3 0x90 nanoslp syz-executor 85581 406000 23959 32767 3 0x90 nanoslp syz-executor 18230 488651 85227 0 3 0x82 wait syz-executor 43891 11646 48964 32767 3 0x90 nanoslp syz-executor 23959 277877 85227 0 3 0x82 wait syz-executor 2857 21472 75581 32767 3 0x90 nanoslp syz-executor 48964 220520 85227 0 3 0x82 wait syz-executor 20208 230406 21365 32767 3 0x90 nanoslp syz-executor 40333 357019 85227 0 3 0x82 wait syz-executor 81130 437137 85227 0 3 0x82 wait syz-executor 21365 188844 85227 0 3 0x82 wait syz-executor 75581 215153 85227 0 3 0x82 wait syz-executor 28454 36858 0 0 3 0x14200 bored sosplice 85227 103322 40941 0 2 0x2 syz-executor 40941 378057 81686 0 3 0x10008a sigsusp ksh 81686 12896 69032 0 3 0x98 kqread sshd-session 69032 382872 44943 0 3 0x92 kqread sshd-session 27108 143516 1 0 3 0x100083 ttyin getty 44943 411003 1 0 3 0x88 kqread sshd 27529 187256 90533 73 2 0x1100010 syslogd 90533 135978 1 0 3 0x100082 sbwait syslogd 50608 519503 1 0 3 0x100080 kqread resolvd 48575 69031 46663 77 3 0x100092 kqread dhcpleased 1567 117213 46663 77 3 0x100092 kqread dhcpleased 46663 319687 1 0 3 0x80 kqread dhcpleased 37249 348358 0 0 3 0x14200 bored smr 68015 140021 0 0 3 0x14200 pgzero zerothread 72120 474396 0 0 3 0x14200 aiodoned aiodoned 86620 498466 0 0 3 0x14200 syncer update 73466 332890 0 0 3 0x14200 cleaner cleaner 95271 161724 0 0 3 0x14200 reaper reaper 45111 402202 0 0 3 0x14200 pgdaemon pagedaemon 31630 128548 0 0 3 0x14200 bored viomb 52309 81989 0 0 3 0x40014200 acpi0 acpi0 8880 42456 0 0 3 0x40014200 idle1 81324 169636 0 0 3 0x14200 bored softnet3 3328 236355 0 0 3 0x14200 bored softnet2 94694 282632 0 0 3 0x14200 bored softnet1 20756 70409 0 0 3 0x14200 bored softnet0 47663 170621 0 0 3 0x14200 bored systqmp 66895 199430 0 0 3 0x14200 bored systq 62211 64237 0 0 3 0x14200 tmoslp softclockmp 11598 300683 0 0 3 0x40014200 tmoslp softclock 58417 475666 0 0 3 0x40014200 idle0 1 465641 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 47645 (syz-executor) thread 0xffff8000371c0538 (477470) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8355de48) #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 ffs_update+0x34c sys/ufs/ffs/ffs_inode.c:111 #7 ufs_direnter+0x721 sys/ufs/ufs/ufs_lookup.c:726 #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 (0xfffffd8071bfb2b8) #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 24776 (syz-executor) thread 0xffff8000ffff56e8 (340396) exclusive rrwlock inode r = 0 (0xfffffd8071bfb5e8) #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 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:120 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3101 #10 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #10 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8078758a38) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3086 #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 Process 27529 (syslogd) thread 0xffff8000ffffd960 (187256) exclusive rrwlock inode r = 0 (0xfffffd806e2f3b40) #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 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2928 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 10026K 10036K 166960K 11427 0 pcb 17 12K 12K 166960K 17 0 rtable 214 6K 7K 166960K 1723 0 pf 29 16K 16K 166960K 123 0 ifaddr 38 7K 7K 166960K 225 0 ifgroup 46 2K 2K 166960K 232 0 sysctl 1 0K 0K 166960K 2 0 counters 62 36K 36K 166960K 154 0 ioctlops 0 0K 2K 166960K 84 0 iov 0 0K 16K 166960K 101 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1454 91K 91K 166960K 2163 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 18 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 26 0 dirhash 15 2K 2K 166960K 30 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 25 93K 153K 166960K 1482 0 sigio 0 0K 0K 166960K 19 0 proc 56 78K 176K 166960K 1791 0 subproc 104 6K 12K 166960K 767 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 118 0 in_multi 88 6K 7K 166960K 607 0 ether_multi 1 0K 0K 166960K 8 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 1072 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 252 74K 130K 166960K 12236 0 UVM aobj 65 3K 5K 166960K 69 0 pinsyscall 46 92K 125K 166960K 3639 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 43 0 NDP 10 0K 1K 166960K 159 0 temp 61 6820K 6884K 166960K 12478 0 kqueue 13 20K 29K 166960K 181 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 120 247 0 244 3 2 1 3 0 8 0 rtentry 112 607 0 507 6 2 4 4 0 8 1 unpcb 144 883 0 862 9 7 2 4 0 8 1 syncache 336 10 0 10 5 4 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 459 0 451 14 10 4 7 0 8 3 arp 120 107 0 91 1 0 1 1 0 8 0 ipq 40 5 0 2 1 0 1 1 0 8 0 ipqe 40 94 0 91 1 0 1 1 0 8 0 inpcb 336 1116 0 1105 16 12 4 7 0 8 3 nd6 136 167 0 145 1 0 1 1 0 8 0 kcovpl 48 59 0 51 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2510 0 2096 45 19 26 31 0 8 0 art_table 32 2511 0 2096 4 0 4 4 0 8 0 art_node 16 606 0 515 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 10 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 23 0 13 1 0 1 1 0 8 0 shmpl 112 66 0 4 2 0 2 2 0 8 0 dirhash 1024 29 0 10 3 0 3 3 0 8 0 dino2pl 256 2653 0 1028 102 0 102 102 0 8 0 ffsino 272 2653 0 1028 109 0 109 109 0 8 0 nchpl 144 3731 0 1972 66 0 66 66 0 8 0 uvmvnodes 80 3429 0 0 70 0 70 70 0 8 0 vnodes 216 3429 0 0 191 0 191 191 0 8 0 namei 1024 16806 0 16804 7 6 1 2 0 8 0 percpumem 16 91 0 46 1 0 1 1 0 8 0 kstatmem 264 112 0 92 2 0 2 2 0 8 0 scxspl 216 24076 0 24075 13 12 1 8 1 8 0 plimitpl 152 508 0 484 2 0 2 2 0 8 0 sigapl 424 1660 0 1604 10 2 8 8 0 8 0 futexpl 64 9654 0 9649 4 3 1 1 0 8 0 knotepl 120 971 0 0 29 0 29 29 0 8 0 kqueuepl 216 254 0 244 2 1 1 2 0 8 0 pipepl 320 381 0 354 4 0 4 4 0 8 0 fdescpl 496 1641 0 1604 9 2 7 7 0 8 0 filepl 152 7987 0 7735 22 8 14 18 0 8 0 lockfpl 104 227 0 225 1 0 1 1 0 8 0 lockfspl 48 81 0 79 1 0 1 1 0 8 0 sessionpl 144 65 0 49 1 0 1 1 0 8 0 pgrppl 48 131 0 107 1 0 1 1 0 8 0 ucredpl 104 1311 0 1292 1 0 1 1 0 8 0 zombiepl 144 1605 0 1604 1 0 1 1 0 8 0 processpl 1160 1660 0 1604 6 0 6 6 0 8 1 procpl 648 2768 0 2703 9 2 7 7 0 8 0 sosppl 168 6 0 6 4 3 1 1 0 8 1 sockpl 664 2253 0 2218 30 24 6 20 0 8 3 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 238 0 0 30 0 30 30 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 466 0 0 26 0 26 26 0 8 0 bufpl 280 6486 0 314 441 0 441 441 0 8 0 anonpl 24 331844 0 328426 78 2 76 76 0 185 40 amapchunkpl 152 39519 0 38952 40 4 36 38 0 158 11 amappl16 200 8041 0 8024 59 50 9 26 0 8 8 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 194 0 184 1 0 1 1 0 8 0 amappl13 176 10 0 10 2 2 0 1 0 8 0 amappl12 168 2962 0 2925 4 1 3 3 0 8 1 amappl11 160 53 0 43 1 0 1 1 0 8 0 amappl10 152 17 0 17 1 1 0 1 0 8 0 amappl9 144 159 0 159 1 1 0 1 0 8 0 amappl8 136 22 0 21 1 0 1 1 0 8 0 amappl7 128 188 0 178 1 0 1 1 0 8 0 amappl6 120 601 0 599 1 0 1 1 0 8 0 amappl5 112 310 0 301 1 0 1 1 0 8 0 amappl4 104 420 0 404 1 0 1 1 0 8 0 amappl3 96 6779 0 6670 5 1 4 4 0 8 0 amappl2 88 1948 0 1868 2 0 2 2 0 8 0 amappl1 80 14170 0 13619 14 1 13 14 0 8 0 amappl 88 11535 0 11337 7 2 5 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 68 0 4 2 0 2 2 0 8 0 uaddrrnd 24 1641 0 1604 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1641 0 1604 1 0 1 1 0 8 0 vmmpekpl 168 15434 0 15379 4 0 4 4 0 8 0 vmmpepl 168 107761 0 105739 122 20 102 108 0 357 8 vmsppl 440 1640 0 1604 6 0 6 6 0 8 0 rwobjpl 56 37920 0 33572 64 1 63 63 0 8 0 pdppl 4096 3289 0 3208 239 156 83 111 0 8 2 pvpl 32 32063 0 0 258 0 258 258 0 265 0 pmappl 248 1640 0 1604 5 1 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 604 0 209 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8348fff0) 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(ffffffff8355dc40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8355dc40) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800030796e40,ffff80000006bc00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7efdfcbb0f80, count: 9 ddb{0}> trace x86_ipi_db(ffffffff8348fff0) 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(ffffffff8355dc40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8355dc40) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800030796e40,ffff80000006bc00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7efdfcbb0f80, count: -6 ddb{0}> machine ddbcpu 1 Stopped at fifo_write+0x6e: movq 0x8(%rax),%r15 fifo_write(ffff80002a0c6970) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd806c22a2c8,ffff80002a0c6a08,8,fffffd807f7d3478) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c22a2c8,ffff800029fe6000,fe,0,1,b2caafef8eba27c4,ffff80002a0c6b30,fffffd806c22a2c8,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a0c6b30) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806c78e1e8,ffff80002a0c6cb0,ffff80002a0c6ce0,ffff80002a0c6be0,ffff800029fe6000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000371c0538,20000700,4,20000200) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a0c6e60) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0c6e60) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ea446d1fd0, count: 7 ddb{1}> trace fifo_write(ffff80002a0c6970) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281 VOP_WRITE(fffffd806c22a2c8,ffff80002a0c6a08,8,fffffd807f7d3478) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806c22a2c8,ffff800029fe6000,fe,0,1,b2caafef8eba27c4,ffff80002a0c6b30,fffffd806c22a2c8,78) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 ufs_symlink(ffff80002a0c6b30) at ufs_symlink+0x1ee sys/ufs/ufs/ufs_vnops.c:1309 VOP_SYMLINK(fffffd806c78e1e8,ffff80002a0c6cb0,ffff80002a0c6ce0,ffff80002a0c6be0,ffff800029fe6000) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432 dosymlinkat(ffff8000371c0538,20000700,4,20000200) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806 syscall(ffff80002a0c6e60) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0c6e60) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ea446d1fd0, count: -8