panic: mtx 0xffffffff838c6458: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *198158 89897 0 0 0 1 syz-executor 307704 73049 0 0x14000 0x40000200 0 softclock db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833c7dab) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838c6458) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff838c6458) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd8007cba920) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8007cba920) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd805c5e8448,8040000000000000,ffff8000398ce068,ffff8000398ce044,0,0,b209acf740636379,ffff8000398ce2c0) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000398ce288,ffff8000398ce2c0,ffff8000398ce0f0,ffff8000398ce0f8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff8000398ce288,ffff8000398ce2c0,ffff8000398ce200) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806be8fc90,400000000000,0,2) at uvm_fault+0x272 upageflttrap(ffff8000398ce410,400000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000398ce410) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7392d3251ec0, count: 2 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: mtx 0xffffffff838c6458: locking against myself ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833c7dab) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838c6458) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff838c6458) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd8007cba920) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8007cba920) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd805c5e8448,8040000000000000,ffff8000398ce068,ffff8000398ce044,0,0,b209acf740636379,ffff8000398ce2c0) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000398ce288,ffff8000398ce2c0,ffff8000398ce0f0,ffff8000398ce0f8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff8000398ce288,ffff8000398ce2c0,ffff8000398ce200) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806be8fc90,400000000000,0,2) at uvm_fault+0x272 upageflttrap(ffff8000398ce410,400000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000398ce410) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7392d3251ec0, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000398cddb0 rbx 0xffff800029a9cdc7 rdx 0 rcx 0xffff8000ffffc2a0 rax 0xffff800029a9bff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x63aed29811740c95 r11 0x76856ae36194c0a5 r12 0xffff800029a9cbc8 r13 0 r14 0 r15 0x1 rip 0xffffffff8160e9c5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000398cdda0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=198158 pid=89897 tcnt=4 stat=onproc flags process=0 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff3c58,0xffff8000ffffcf80 process=0xffff8000ffff6e10 user=0xffff8000398c9000, vmspace=0xfffffd806be8fc90 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9945 72903 29993 0 2 0 syz-executor 9945 308353 29993 0 2 0x4000000 syz-executor *89897 198158 81329 0 7 0 syz-executor 89897 81248 81329 0 3 0x4000080 fsleep syz-executor 89897 418335 81329 0 3 0x4000080 fsleep syz-executor 89897 290220 81329 0 3 0x4000080 fsleep syz-executor 43152 469517 12864 0 2 0x480 syz-executor 43152 341086 12864 0 3 0x4000080 kqread syz-executor 43152 326163 12864 0 3 0x4000080 fsleep syz-executor 21295 436279 41029 0 3 0x80 nanoslp syz-executor 21295 221087 41029 0 3 0x4000080 fsleep syz-executor 21295 254749 41029 0 3 0x4000080 fsleep syz-executor 21295 338957 41029 0 3 0x4000080 rest syz-executor 37773 197021 31256 0 3 0x80 nanoslp syz-executor 37773 134333 31256 0 3 0x4000080 ttyin syz-executor 38132 25570 64108 0 3 0x80 nanoslp syz-executor 38132 27320 64108 0 3 0x4000080 kqpoll syz-executor 74816 498767 88669 0 3 0x80 nanoslp syz-executor 74816 226796 88669 0 3 0x4000080 semwait syz-executor 74816 424045 88669 0 3 0x4000080 fsleep syz-executor 31256 358117 35135 0 3 0x82 nanoslp syz-executor 83180 481105 0 0 3 0x14200 bored sosplice 12864 454399 35135 0 2 0x482 syz-executor 81329 130580 35135 0 3 0x82 nanoslp syz-executor 19013 168866 35135 0 2 0x482 syz-executor 64108 331457 35135 0 2 0x482 syz-executor 29993 165981 35135 0 3 0x82 nanoslp syz-executor 41029 432519 35135 0 3 0x82 nanoslp syz-executor 88669 384470 35135 0 3 0x82 nanoslp syz-executor 35135 445211 77563 0 3 0x82 kqread syz-executor 77563 213519 20790 0 3 0x10008a sigsusp ksh 20790 430646 8826 0 3 0x98 kqread sshd-session 8826 314723 94656 0 3 0x92 kqread sshd-session 75398 9629 1 0 3 0x100083 ttyin getty 94656 170117 1 0 3 0x88 kqread sshd 61618 14599 64935 74 3 0x1100092 bpf pflogd 64935 315657 1 0 3 0x80 sbwait pflogd 7220 151667 23006 73 3 0x1100090 kqread syslogd 23006 333552 1 0 3 0x100082 sbwait syslogd 82297 193981 1 0 3 0x100080 kqread resolvd 63230 143346 77643 77 3 0x100092 kqread dhcpleased 75114 339267 77643 77 3 0x100092 kqread dhcpleased 77643 51730 1 0 3 0x80 kqread dhcpleased 90693 97746 0 0 3 0x14200 bored smr 75450 422888 0 0 3 0x14200 pgzero zerothread 91545 96879 0 0 3 0x14200 aiodoned aiodoned 14269 95038 0 0 3 0x14200 syncer update 86632 148118 0 0 3 0x14200 cleaner cleaner 27317 4512 0 0 3 0x14200 reaper reaper 85518 5179 0 0 3 0x14200 pgdaemon pagedaemon 66018 96895 0 0 3 0x14200 bored viomb 4463 277043 0 0 3 0x40014200 acpi0 acpi0 57101 494390 0 0 3 0x40014200 idle1 30230 433695 0 0 3 0x14200 bored softnet3 58645 216233 0 0 3 0x14200 bored softnet2 3444 230636 0 0 3 0x14200 bored softnet1 48397 208176 0 0 2 0x14200 softnet0 32579 138814 0 0 3 0x14200 bored systqmp 13700 5487 0 0 3 0x14200 bored systq 98728 15388 0 0 3 0x14200 tmoslp softclockmp 73049 307704 0 0 7 0x40014200 softclock 30245 79542 0 0 3 0x40014200 idle0 1 477136 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &uvm.pageqlock r = 0 (0xffffffff838c6468) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 uvn_get+0x679 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 9945 (syz-executor) thread 0xffff8000ffff3218 (72903) shared rwlock vmmaplk r = 0 (0xfffffd806be8f838) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #3 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:730 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:666 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 Process 89897 (syz-executor) thread 0xffff8000ffffc2a0 (198158) exclusive rwlock uobjlk r = 0 (0xfffffd807434eea8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 uvn_io+0x667 sys/uvm/uvm_vnode.c:1297 #3 uvn_get+0x31d sys/uvm/uvm_vnode.c:1102 #4 uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 exclusive mutex &uvm.pageqlock r = 0 (0xffffffff838c6468) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 uvn_get+0x679 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 37773 (syz-executor) thread 0xffff80002a3927d0 (134333) exclusive rrwlock inode r = 0 (0xfffffd805e5e6960) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 spec_open+0x305 sys/kern/spec_vnops.c:151 #6 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #7 vn_open+0x708 sys/kern/vfs_vnops.c:177 #8 vndioctl+0xcb1 sys/dev/vnd.c:457 #9 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #11 sys_ioctl+0x5c3 #12 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10226 11093K 11348K 166960K 11516 0 pcb 18 15K 16K 166960K 108 0 rtable 227 10K 11K 166960K 619 0 pf 42 19K 22K 166960K 344 0 ifaddr 40 6K 7K 166960K 61 0 ifgroup 59 2K 2K 166960K 95 0 sysctl 1 1K 1K 166960K 1 0 counters 66 36K 37K 166960K 94 0 ioctlops 0 0K 4K 166960K 1608 0 iov 0 0K 28K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1535 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 1K 166960K 10 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 348 0 sigio 0 0K 0K 166960K 3 0 proc 72 91K 140K 166960K 583 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 26 0 in_multi 87 6K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 217 970K 970K 166960K 217 0 exec 0 0K 1K 166960K 407 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 244 73K 77K 166960K 4791 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 43 86K 103K 166960K 1457 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 14 0 NDP 13 0K 2K 166960K 41 0 temp 43 8680K 8806K 166960K 7641 0 kqueue 14 22K 28K 166960K 69 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 56 0 52 1 0 1 1 0 8 0 rtentry 160 188 0 91 5 0 5 5 0 8 0 unpcb 144 163 0 142 2 0 2 2 0 8 1 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 808 161 0 154 7 6 1 7 0 8 0 arp 120 21 0 6 1 0 1 1 0 8 0 inpcb 376 538 0 525 11 9 2 11 0 8 0 nd6 136 28 0 6 1 0 1 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1168 8 0 8 1 0 1 1 0 8 1 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 7 0 2 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 35 0 33 2 1 1 1 0 8 0 pfstitem 24 33 0 0 1 0 1 1 0 8 0 pfstkey 128 35 0 2 2 0 2 2 0 8 0 pfstate 376 34 0 1 4 0 4 4 0 8 0 pfrule 1344 92 0 83 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 501 0 92 29 0 29 29 0 8 2 art_table 32 502 0 92 4 0 4 4 0 8 0 art_node 16 123 0 36 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semapl 112 7 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 1959 0 455 95 0 95 95 0 8 0 ffsino 280 1959 0 455 109 0 109 109 0 8 0 nchpl 144 2429 0 742 63 0 63 63 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 2131 0 0 44 0 44 44 0 8 0 vnodes 216 2131 0 0 119 0 119 119 0 8 0 namei 1024 7858 0 7858 3 2 1 2 0 8 1 percpumem 16 61 0 14 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 46 0 20 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 7513 0 7513 3 2 1 2 1 8 1 plimitpl 152 81 0 63 1 0 1 1 0 8 0 sigapl 424 646 0 595 7 0 7 7 0 8 0 futexpl 64 3200 0 3193 1 0 1 1 0 8 0 knotepl 120 313 0 0 10 0 10 10 0 8 0 kqueuepl 216 155 0 144 6 4 2 5 0 8 0 pipepl 328 123 0 96 3 0 3 3 0 8 0 fdescpl 504 627 0 595 5 0 5 5 0 8 0 filepl 152 3286 0 3058 15 5 10 15 0 8 0 lockfpl 104 51 0 47 1 0 1 1 0 8 0 lockfspl 48 26 0 22 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 418 0 404 1 0 1 1 0 8 0 zombiepl 144 596 0 595 2 1 1 1 0 8 0 processpl 1176 646 0 595 5 0 5 5 0 8 0 procpl 656 995 0 931 6 0 6 6 0 8 0 srpgc 96 6 0 6 2 1 1 1 0 8 1 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 688 763 0 725 14 9 5 13 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 244 0 0 16 0 16 16 0 8 0 bufpl 280 2656 0 130 181 0 181 181 0 8 0 anonpl 24 117878 0 114395 36 2 34 34 0 184 11 amapchunkpl 152 14677 0 14120 28 1 27 28 0 158 5 amappl16 200 2169 0 2135 5 3 2 5 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 120 0 108 1 0 1 1 0 8 0 amappl13 176 33 0 33 1 1 0 1 0 8 0 amappl12 168 1315 0 1283 3 1 2 2 0 8 0 amappl11 160 51 0 36 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 276 0 276 1 1 0 1 0 8 0 amappl8 136 25 0 21 1 0 1 1 0 8 0 amappl7 128 110 0 98 1 0 1 1 0 8 0 amappl6 120 199 0 195 1 0 1 1 0 8 0 amappl5 112 127 0 118 1 0 1 1 0 8 0 amappl4 104 311 0 292 1 0 1 1 0 8 0 amappl3 96 2625 0 2497 4 0 4 4 0 8 0 amappl2 88 662 0 599 2 0 2 2 0 8 0 amappl1 80 8674 0 8099 16 2 14 14 0 8 1 amappl 88 4396 0 4208 6 1 5 5 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 627 0 595 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 627 0 595 1 0 1 1 0 8 0 vmmpekpl 168 6767 0 6724 3 0 3 3 0 8 0 vmmpepl 168 44692 0 42752 90 0 90 90 0 357 5 vmsppl 456 626 0 595 5 0 5 5 0 8 0 rwobjpl 64 17336 0 14240 50 0 50 50 0 8 0 pdppl 4096 1262 0 1190 104 30 74 86 0 8 2 pvpl 32 13113 0 0 108 2 106 106 0 265 0 pmappl 248 626 0 595 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 291 0 41 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8380dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 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(ffffffff83964538) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83964538) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff83964538,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 sleep_finish(0,1) at sleep_finish+0x24f sys/kern/kern_synch.c:412 msleep(ffffffff839686f0,ffffffff83833b30,0,ffffffff8343edfa,0) at msleep+0x13b sys/kern/kern_synch.c:247 softclock_thread(ffff8000ffffea40) at softclock_thread+0x11f sys/kern/kern_timeout.c:806 end trace frame: 0x0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff8380dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 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(ffffffff83964538) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83964538) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff83964538,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 sleep_finish(0,1) at sleep_finish+0x24f sys/kern/kern_synch.c:412 msleep(ffffffff839686f0,ffffffff83833b30,0,ffffffff8343edfa,0) at msleep+0x13b sys/kern/kern_synch.c:247 softclock_thread(ffff8000ffffea40) at softclock_thread+0x11f sys/kern/kern_timeout.c:806 end trace frame: 0x0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833c7dab) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838c6458) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff838c6458) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd8007cba920) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8007cba920) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd805c5e8448,8040000000000000,ffff8000398ce068,ffff8000398ce044,0,0,b209acf740636379,ffff8000398ce2c0) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000398ce288,ffff8000398ce2c0,ffff8000398ce0f0,ffff8000398ce0f8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff8000398ce288,ffff8000398ce2c0,ffff8000398ce200) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806be8fc90,400000000000,0,2) at uvm_fault+0x272 upageflttrap(ffff8000398ce410,400000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000398ce410) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7392d3251ec0, count: 2 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833c7dab) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff838c6458) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff838c6458) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd8007cba920) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd8007cba920) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd805c5e8448,8040000000000000,ffff8000398ce068,ffff8000398ce044,0,0,b209acf740636379,ffff8000398ce2c0) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000398ce288,ffff8000398ce2c0,ffff8000398ce0f0,ffff8000398ce0f8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff8000398ce288,ffff8000398ce2c0,ffff8000398ce200) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806be8fc90,400000000000,0,2) at uvm_fault+0x272 upageflttrap(ffff8000398ce410,400000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000398ce410) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7392d3251ec0, count: -13