panic: mtx 0xffffffff8390c838: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *466716 28686 32767 0x10 0 0 syz-executor 142152 13056 32767 0x10 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e5df1) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff8390c838) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff8390c838) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80081c9f80) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80081c9f80) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80081c9f80) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806602cd08,0,ffff800037406f28,ffff800037406f04,0,2,e9009c692d83b6b6,ffff800037407180) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff800037407148,ffff800037407180,ffff800037406fb0,ffff800037406fb8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff800037407148,ffff800037407180,ffff8000374070c0) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806bfeb210,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000374072d0,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000374072d0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7d14f99540c0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: mtx 0xffffffff8390c838: locking against myself ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e5df1) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff8390c838) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff8390c838) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80081c9f80) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80081c9f80) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80081c9f80) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806602cd08,0,ffff800037406f28,ffff800037406f04,0,2,e9009c692d83b6b6,ffff800037407180) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff800037407148,ffff800037407180,ffff800037406fb0,ffff800037406fb8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff800037407148,ffff800037407180,ffff8000374070c0) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806bfeb210,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000374072d0,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000374072d0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7d14f99540c0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800037406c70 rbx 0xffffffff837d8dcf cpu_info_full_primary+0x2dcf rdx 0 rcx 0xffff80003880b9d0 rax 0xffffffff837d7ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x803e1d6bfd64aaa3 r11 0xacf39226c730126b r12 0xffffffff837d8bd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff823fd865 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800037406c60 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=466716 pid=28686 tcnt=4 stat=onproc flags process=10 proc=0 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003880a550,0xffff80003880b230 process=0xffff80003c0292c0 user=0xffff800037402000, vmspace=0xfffffd806bfeb210 estcpu=18, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *28686 466716 55023 32767 7 0x10 syz-executor 28686 79233 55023 32767 3 0x4000010 biowait syz-executor 28686 286042 55023 32767 3 0x4000090 fsleep syz-executor 28686 415773 55023 32767 3 0x4000090 fsleep syz-executor 65415 346829 87185 32767 2 0x10 syz-executor 65415 309551 87185 32767 2 0x4000010 syz-executor 65415 31074 87185 32767 2 0x4000010 syz-executor 13056 142152 85990 32767 7 0x10 syz-executor 13056 505490 85990 32767 3 0x4000090 fsleep syz-executor 13056 488669 85990 32767 3 0x4000090 fsleep syz-executor 15506 521544 3304 32767 2 0x10 syz-executor 15506 203291 3304 32767 3 0x4000090 fsleep syz-executor 15506 144779 3304 32767 2 0x4000010 syz-executor 4915 86740 88080 32767 2 0x10 syz-executor 4915 114936 88080 32767 2 0x4000010 syz-executor 4915 201792 88080 32767 3 0x4000090 fsleep syz-executor 81272 515621 2292 32767 2 0x10 syz-executor 81272 89063 2292 32767 3 0x4000090 fsleep syz-executor 81272 94117 2292 32767 2 0x4000010 syz-executor 81272 296650 2292 32767 2 0x4000010 syz-executor 49364 455052 5303 32767 2 0x10 syz-executor 49364 274566 5303 32767 3 0x4000090 fsleep syz-executor 37711 191154 21174 0 2 0x2 syz-executor 18523 9718 0 0 3 0x14200 bored sosplice 11890 468049 53441 0 3 0x82 sbwait sshd-session 35812 263137 53441 0 3 0x82 sbwait sshd-session 88080 503383 11497 32767 3 0x90 nanoslp syz-executor 87185 102700 41205 32767 3 0x90 nanoslp syz-executor 5303 205958 20291 32767 2 0x10 syz-executor 3304 134970 9800 32767 3 0x90 nanoslp syz-executor 55023 355167 8635 32767 3 0x90 nanoslp syz-executor 85990 316147 64415 32767 3 0x90 nanoslp syz-executor 2292 337849 11367 32767 3 0x90 nanoslp syz-executor 64415 522575 21174 0 3 0x82 wait syz-executor 9800 113142 21174 0 3 0x82 wait syz-executor 11497 387662 21174 0 3 0x82 wait syz-executor 41205 499491 21174 0 3 0x82 wait syz-executor 11367 329536 21174 0 3 0x82 wait syz-executor 8635 405021 21174 0 3 0x82 wait syz-executor 20291 181040 21174 0 3 0x82 wait syz-executor 21174 170931 66613 0 3 0x82 kqread syz-executor 66613 94440 67358 0 3 0x10008a sigsusp ksh 67358 81055 39116 0 3 0x98 kqread sshd-session 39116 138854 53441 0 3 0x92 kqread sshd-session 8496 388422 1 0 3 0x100083 ttyin getty 53441 99035 1 0 3 0x88 kqread sshd 16709 43801 95087 73 3 0x1100090 kqread syslogd 95087 228995 1 0 3 0x100082 sbwait syslogd 75283 67575 1 0 3 0x100080 kqread resolvd 59612 10076 5581 77 3 0x100092 kqread dhcpleased 68919 408313 5581 77 3 0x100092 kqread dhcpleased 5581 24956 1 0 3 0x80 kqread dhcpleased 77548 145278 0 0 3 0x14200 bored smr 77595 302629 0 0 2 0x14200 zerothread 83805 251218 0 0 3 0x14200 aiodoned aiodoned 92877 498132 0 0 3 0x14200 syncer update 92407 472801 0 0 3 0x14200 cleaner cleaner 1591 209115 0 0 3 0x14200 reaper reaper 37896 222843 0 0 3 0x14200 pgdaemon pagedaemon 1013 206637 0 0 3 0x14200 bored viomb 17223 456518 0 0 3 0x40014200 acpi0 acpi0 29304 203615 0 0 3 0x40014200 idle1 53001 326323 0 0 3 0x14200 bored softnet3 35823 190120 0 0 3 0x14200 bored softnet2 18533 261118 0 0 3 0x14200 bored softnet1 39233 500065 0 0 3 0x14200 bored softnet0 3456 148679 0 0 3 0x14200 bored systqmp 53625 35360 0 0 3 0x14200 bored systq 45136 350954 0 0 3 0x14200 tmoslp softclockmp 85391 219769 0 0 3 0x40014200 tmoslp softclock 56467 5562 0 0 3 0x40014200 idle0 1 4787 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &uvm.pageqlock r = 0 (0xffffffff8390c848) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #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 sys/uvm/uvm_fault.c:-1 #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 28686 (syz-executor) thread 0xffff80003880b9d0 (466716) exclusive rwlock uobjlk r = 0 (0xfffffd80669306d8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #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 sys/uvm/uvm_fault.c:-1 #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 (0xffffffff8390c848) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #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 sys/uvm/uvm_fault.c:-1 #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 28686 (syz-executor) thread 0xffff80003880b220 (79233) exclusive rrwlock inode r = 0 (0xfffffd806bdd3c20) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #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 sys_ftruncate+0x1c4 sys/kern/vfs_syscalls.c:2920 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 28686 (syz-executor) thread 0xffff80002a2c42b0 (286042) exclusive rwlock futexpl r = 0 (0xffffffff839094e0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 pool_get+0x10b sys/kern/subr_pool.c:583 #3 futex_get+0x309 sys/kern/sys_futex.c:171 #4 futex_wait+0x328 sys/kern/sys_futex.c:-1 #5 sys_futex+0x149 sys/kern/sys_futex.c:101 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock futex r = 0 (0xffffffff8382df58) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sys_futex+0x69 sys/kern/sys_futex.c:98 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10183 10952K 10965K 166960K 11263 0 pcb 17 12K 12K 166960K 17 0 rtable 212 6K 7K 166960K 354 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 4 1K 1K 166960K 4 0 counters 62 36K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 35 0 iov 0 0K 18K 166960K 16 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1336 84K 84K 166960K 1478 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 20 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 113K 166960K 414 0 sigio 0 0K 0K 166960K 7 0 proc 58 79K 115K 166960K 502 0 subproc 69 4K 4K 166960K 177 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 59 0 in_multi 88 6K 7K 166960K 115 0 ether_multi 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 382 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 264 168K 199K 166960K 5150 0 UVM aobj 11 4K 4K 166960K 12 0 pinsyscall 49 98K 104K 166960K 1439 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 23 0 NDP 10 0K 2K 166960K 27 0 temp 43 8680K 8746K 166960K 4922 0 kqueue 13 20K 26K 166960K 55 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 47 0 43 1 0 1 1 0 8 0 rtentry 176 113 0 14 6 0 6 6 0 8 1 unpcb 144 218 0 194 2 0 2 2 0 8 1 syncache 336 10 0 10 1 0 1 1 0 8 1 tcpcb 808 143 0 135 5 0 5 5 0 8 4 arp 128 18 0 2 1 0 1 1 0 8 0 inpcb 384 434 0 390 8 0 8 8 0 8 3 nd6 144 26 0 5 1 0 1 1 0 8 0 kcovpl 48 19 0 12 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 464 0 55 29 0 29 29 0 8 2 art_table 32 465 0 55 4 0 4 4 0 8 0 art_node 16 112 0 22 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 17 0 7 1 0 1 1 0 8 0 shmpl 112 9 0 1 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 1925 0 401 96 0 96 96 0 8 0 ffsino 288 1925 0 401 109 0 109 109 0 8 0 nchpl 144 2440 0 747 63 0 63 63 0 8 0 uvmvnodes 80 2111 0 0 44 0 44 44 0 8 0 vnodes 216 2111 0 0 118 0 118 118 0 8 0 namei 1024 7934 0 7934 2 1 1 2 0 8 1 percpumem 16 47 0 1 1 0 1 1 0 8 0 kstatmem 264 22 0 2 2 0 2 2 0 8 0 scxspl 216 8776 0 8774 3 2 1 2 1 8 0 plimitpl 152 122 0 98 2 0 2 2 0 8 1 sigapl 424 668 0 611 7 0 7 7 0 8 0 futexpl 64 3448 0 3440 1 0 1 1 0 8 0 knotepl 120 317 0 0 10 0 10 10 0 8 0 kqueuepl 224 149 0 139 5 0 5 5 0 8 4 pipepl 336 151 0 123 3 0 3 3 0 8 0 fdescpl 520 649 0 611 3 0 3 3 0 8 0 filepl 160 3246 0 2978 14 0 14 14 0 8 2 lockfpl 104 68 0 65 1 0 1 1 0 8 0 lockfspl 48 25 0 22 1 0 1 1 0 8 0 sessionpl 144 38 0 21 1 0 1 1 0 8 0 pgrppl 48 59 0 34 1 0 1 1 0 8 0 ucredpl 104 357 0 339 1 0 1 1 0 8 0 zombiepl 144 611 0 611 1 0 1 1 0 8 1 processpl 1192 668 0 611 5 0 5 5 0 8 0 procpl 656 1083 0 1011 7 0 7 7 0 8 1 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 728 699 0 627 10 0 10 10 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 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 311 0 0 20 0 20 20 0 8 0 bufpl 280 3187 0 117 220 0 220 220 0 8 0 anonpl 32 7721 0 0 63 0 63 63 0 246 0 amapchunkpl 152 16224 0 15668 38 1 37 38 0 158 15 amappl16 200 2850 0 2824 16 5 11 15 0 8 8 amappl15 192 9 0 8 1 0 1 1 0 8 0 amappl14 184 139 0 127 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1247 0 1208 2 0 2 2 0 8 0 amappl11 160 48 0 38 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 247 0 246 1 0 1 1 0 8 0 amappl8 136 25 0 24 1 0 1 1 0 8 0 amappl7 128 100 0 88 1 0 1 1 0 8 0 amappl6 120 178 0 173 1 0 1 1 0 8 0 amappl5 112 115 0 109 1 0 1 1 0 8 0 amappl4 104 298 0 283 1 0 1 1 0 8 0 amappl3 96 2837 0 2706 4 0 4 4 0 8 0 amappl2 88 707 0 640 2 0 2 2 0 8 0 amappl1 80 10169 0 9425 17 0 17 17 0 8 0 amappl 88 4431 0 4242 5 0 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 11 0 1 1 0 1 1 0 8 0 uaddrrnd 24 649 0 611 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 649 0 611 1 0 1 1 0 8 0 vmmpekpl 168 7359 0 7319 3 0 3 3 0 8 0 vmmpepl 168 49176 0 46833 112 0 112 112 0 357 7 vmsppl 480 648 0 611 7 1 6 6 0 8 1 rwobjpl 72 18717 0 15553 61 0 61 61 0 8 1 pdppl 4096 1306 0 1222 108 20 88 92 0 8 4 pvpl 32 16597 0 0 134 0 134 134 0 265 0 pmappl 256 648 0 611 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 405 0 24 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e5df1) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff8390c838) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff8390c838) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80081c9f80) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80081c9f80) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80081c9f80) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806602cd08,0,ffff800037406f28,ffff800037406f04,0,2,e9009c692d83b6b6,ffff800037407180) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff800037407148,ffff800037407180,ffff800037406fb0,ffff800037406fb8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff800037407148,ffff800037407180,ffff8000374070c0) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806bfeb210,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000374072d0,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000374072d0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7d14f99540c0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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(ffffffff839c4980) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839c4980) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd806bfeb990,d219739c000,0,1) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:689 upageflttrap(ffff80003c443630,d219739c000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003c443630) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7c63cd355c10, count: 7 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(ffffffff839c4980) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839c4980) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd806bfeb990,d219739c000,0,1) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:689 upageflttrap(ffff80003c443630,d219739c000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003c443630) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7c63cd355c10, count: -8