panic: mtx 0xffffffff83a05ac8: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *150911 82910 32767 0x10 0 1 syz-executor 126084 49178 0 0x14000 0x200 0 zerothread db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e0af8) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83a05ac8) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83a05ac8) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80083346d0) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80083346d0) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80083346d0) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8067efd0d8,1000,ffff8000383eb6d8,ffff8000383eb6b4,0,2,6e1cb88f1be7d9ec,ffff8000383eb930) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000383eb8f8,ffff8000383eb930,ffff8000383eb760,ffff8000383eb768) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff8000383eb8f8,ffff8000383eb930,ffff8000383eb870) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806be3ed50,200000001000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000383eba80,2000000011c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000383eba80) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7e8fcc5674c0, 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 0xffffffff83a05ac8: locking against myself ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e0af8) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83a05ac8) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83a05ac8) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80083346d0) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80083346d0) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80083346d0) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8067efd0d8,1000,ffff8000383eb6d8,ffff8000383eb6b4,0,2,6e1cb88f1be7d9ec,ffff8000383eb930) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000383eb8f8,ffff8000383eb930,ffff8000383eb760,ffff8000383eb768) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff8000383eb8f8,ffff8000383eb930,ffff8000383eb870) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806be3ed50,200000001000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000383eba80,2000000011c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000383eba80) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7e8fcc5674c0, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000383eb420 rbx 0xffff8000299dedcf rdx 0 rcx 0xffff80002a2b47d0 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb0ef0da1d3b748d6 r11 0xc583dad25b9a2543 r12 0xffff8000299debd0 r13 0 r14 0 r15 0x1 rip 0xffffffff82f9a375 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000383eb410 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=150911 pid=82910 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=0xffff80003c44c7d8,0xffff80002a2b54b0 process=0xffff80003a81a0b8 user=0xffff8000383e6000, vmspace=0xfffffd806be3ed50 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *82910 150911 17375 32767 7 0x10 syz-executor 82910 412477 17375 32767 3 0x4000090 fsleep syz-executor 82910 126267 17375 32767 3 0x4000010 biowait syz-executor 82910 65020 17375 32767 3 0x4000090 fsleep syz-executor 35782 227969 2438 32767 3 0x4000090 nanoslp syz-executor 35782 232513 2438 32767 3 0x4000090 ttyopn syz-executor 35782 125490 2438 32767 3 0x4000090 fsleep syz-executor 50671 109676 40223 32767 3 0x90 nanoslp syz-executor 50671 456185 40223 32767 3 0x4000090 kqread syz-executor 50671 346745 40223 32767 3 0x4000090 kqread syz-executor 50671 125087 40223 32767 3 0x4000090 fsleep syz-executor 83265 488438 7863 32767 3 0x90 nanoslp syz-executor 83265 424299 7863 32767 3 0x4000090 ttyout syz-executor 83265 243309 7863 32767 3 0x4000090 ttyout syz-executor 83265 172072 7863 32767 3 0x4000090 fsleep syz-executor 64669 251866 0 0 3 0x14200 bored sosplice 36664 274492 67053 32767 3 0x90 nanoslp syz-executor 36664 118660 67053 32767 3 0x4000090 kqread syz-executor 36664 358346 67053 32767 3 0x4000090 fsleep syz-executor 8021 54598 85222 0 3 0x100082 sbwait arp 85222 151226 10482 0 3 0x10008a sigsusp sh 2438 80411 54980 32767 3 0x90 nanoslp syz-executor 17375 179359 25534 32767 3 0x90 nanoslp syz-executor 10482 456254 2090 0 3 0x80 wait syz-executor 50394 321330 29179 32767 3 0x90 nanoslp syz-executor 40223 124964 28161 32767 3 0x90 nanoslp syz-executor 67053 306446 84838 32767 3 0x90 nanoslp syz-executor 7863 103783 69413 32767 3 0x90 nanoslp syz-executor 28161 54224 99860 0 3 0x82 wait syz-executor 84838 515493 99860 0 3 0x82 wait syz-executor 84588 59537 99860 0 3 0x82 wait syz-executor 54980 189134 99860 0 3 0x82 wait syz-executor 69413 398953 99860 0 3 0x82 wait syz-executor 29179 130044 99860 0 3 0x82 wait syz-executor 2090 449531 99860 0 3 0x82 wait syz-executor 25534 320209 99860 0 3 0x82 wait syz-executor 99860 291689 24729 0 3 0x82 kqread syz-executor 24729 293921 18488 0 3 0x10008a sigsusp ksh 18488 448580 87662 0 3 0x98 kqread sshd-session 87662 495964 70248 0 3 0x92 kqread sshd-session 54540 491474 1 0 3 0x100083 ttyin getty 70248 87440 1 0 3 0x88 kqread sshd 40311 287981 64038 73 3 0x1100090 kqread syslogd 64038 227689 1 0 3 0x100082 sbwait syslogd 99886 211403 1 0 3 0x100080 kqread resolvd 85635 499365 49098 77 3 0x100092 kqread dhcpleased 12277 254726 49098 77 3 0x100092 kqread dhcpleased 49098 185911 1 0 3 0x80 kqread dhcpleased 58600 370749 0 0 3 0x14200 bored smr 49178 126084 0 0 7 0x14200 zerothread 30278 279663 0 0 3 0x14200 aiodoned aiodoned 42482 191088 0 0 3 0x14200 syncer update 17983 20605 0 0 3 0x14200 cleaner cleaner 66698 344289 0 0 3 0x14200 reaper reaper 38548 459570 0 0 3 0x14200 pgdaemon pagedaemon 44862 397510 0 0 3 0x14200 bored viomb 89720 89793 0 0 3 0x40014200 acpi0 acpi0 62703 450619 0 0 3 0x40014200 idle1 93440 388257 0 0 3 0x14200 bored softnet3 52649 42775 0 0 3 0x14200 bored softnet2 15121 357187 0 0 3 0x14200 bored softnet1 87861 298724 0 0 3 0x14200 bored softnet0 53357 105313 0 0 3 0x14200 bored systqmp 66119 380008 0 0 3 0x14200 bored systq 74740 500417 0 0 3 0x14200 tmoslp softclockmp 24830 420844 0 0 3 0x40014200 tmoslp softclock 79699 108036 0 0 3 0x40014200 idle0 1 465278 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 (0xffffffff83a05ad8) #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 82910 (syz-executor) thread 0xffff80002a2b47d0 (150911) exclusive rwlock uobjlk r = 0 (0xfffffd806be41f58) #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 (0xffffffff83a05ad8) #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 82910 (syz-executor) thread 0xffff80002a2b54a0 (412477) exclusive rwlock futexpl r = 0 (0xffffffff839ea500) #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 (0xffffffff83869e38) #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 Process 82910 (syz-executor) thread 0xffff80002a2b4020 (126267) exclusive rrwlock inode r = 0 (0xfffffd806bcad9e0) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10188 10954K 10965K 166960K 11265 0 pcb 17 12K 12K 166960K 17 0 rtable 220 6K 6K 166960K 328 0 pf 31 16K 16K 166960K 31 0 ifaddr 40 7K 7K 166960K 42 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 1K 166960K 1 0 counters 64 36K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 29 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1356 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 26 97K 125K 166960K 184 0 proc 58 79K 115K 166960K 470 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 7 0 in_multi 89 6K 6K 166960K 93 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 334 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 271 162K 176K 166960K 3141 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 48 96K 114K 166960K 1170 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 16 0K 1K 166960K 25 0 temp 41 8679K 8743K 166960K 3776 0 kqueue 17 26K 34K 166960K 36 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 37 0 33 1 0 1 1 0 8 0 rtentry 176 104 0 1 5 0 5 5 0 8 0 unpcb 144 79 0 47 2 0 2 2 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 808 30 0 22 2 0 2 2 0 8 1 arp 128 17 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 384 109 0 97 2 0 2 2 0 8 0 nd6 144 22 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 414 0 0 26 0 26 26 0 8 0 art_table 32 415 0 0 4 0 4 4 0 8 0 art_node 16 103 0 9 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 3 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1607 0 101 95 0 95 95 0 8 0 ffsino 288 1607 0 101 108 0 108 108 0 8 0 nchpl 144 1853 0 173 63 0 63 63 0 8 0 uvmvnodes 80 1688 0 0 35 0 35 35 0 8 0 vnodes 216 1688 0 0 94 0 94 94 0 8 0 namei 1024 5455 0 5455 1 0 1 1 0 8 1 percpumem 16 47 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 6105 0 6103 3 1 2 2 1 8 1 plimitpl 152 39 0 13 2 0 2 2 0 8 1 sigapl 424 456 0 399 8 0 8 8 0 8 0 futexpl 64 773 0 767 1 0 1 1 0 8 0 knotepl 120 156 0 0 6 0 6 6 0 8 1 kqueuepl 224 42 0 27 2 0 2 2 0 8 1 pipepl 336 99 0 71 3 0 3 3 0 8 0 fdescpl 520 437 0 399 4 0 4 4 0 8 0 filepl 160 1650 0 1405 11 0 11 11 0 8 0 lockfpl 104 33 0 30 1 0 1 1 0 8 0 lockfspl 48 13 0 10 1 0 1 1 0 8 0 sessionpl 144 21 0 5 1 0 1 1 0 8 0 pgrppl 48 29 0 5 1 0 1 1 0 8 0 ucredpl 104 168 0 150 1 0 1 1 0 8 0 zombiepl 144 401 0 399 1 0 1 1 0 8 0 processpl 1192 456 0 399 5 0 5 5 0 8 0 procpl 656 542 0 472 7 0 7 7 0 8 1 srpgc 96 1 0 1 1 0 1 1 0 8 1 sockpl 728 226 0 178 5 0 5 5 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 200 0 0 13 0 13 13 0 8 0 bufpl 280 2370 0 117 161 0 161 161 0 8 0 anonpl 32 5409 0 0 44 0 44 44 0 246 0 amapchunkpl 152 9504 0 8914 31 0 31 31 0 158 7 amappl16 200 1799 0 1777 5 0 5 5 0 8 3 amappl15 192 6 0 6 1 0 1 1 0 8 1 amappl14 184 101 0 90 1 0 1 1 0 8 0 amappl13 176 32 0 32 1 0 1 1 0 8 1 amappl12 168 1053 0 1015 2 0 2 2 0 8 0 amappl11 160 44 0 34 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 0 1 1 0 8 1 amappl9 144 244 0 244 1 0 1 1 0 8 1 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 91 0 80 1 0 1 1 0 8 0 amappl6 120 192 0 188 1 0 1 1 0 8 0 amappl5 112 127 0 121 1 0 1 1 0 8 0 amappl4 104 292 0 276 1 0 1 1 0 8 0 amappl3 96 1479 0 1341 4 0 4 4 0 8 0 amappl2 88 594 0 536 2 0 2 2 0 8 0 amappl1 80 7804 0 7196 14 0 14 14 0 8 0 amappl 88 2528 0 2330 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 437 0 399 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 437 0 399 1 0 1 1 0 8 0 vmmpekpl 168 5022 0 4986 2 0 2 2 0 8 0 vmmpepl 168 34018 0 31849 97 0 97 97 0 357 0 vmsppl 480 436 0 399 7 1 6 6 0 8 0 rwobjpl 72 13704 0 11099 48 0 48 48 0 8 0 pdppl 4096 881 0 798 107 16 91 97 0 8 8 pvpl 32 12667 0 0 103 0 103 103 0 265 0 pmappl 256 436 0 399 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 388 0 19 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8380fff0) 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(ffffffff838e3dc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838e3dc0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a258910,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_const_cmp4(1,3) at __sanitizer_cov_trace_const_cmp4+0x2e kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_const_cmp4(1,3) at __sanitizer_cov_trace_const_cmp4+0x2e sys/dev/kcov.c:230 witness_checkorder(ffffffff83a05b10,9,0) at witness_checkorder+0x5a sys/kern/subr_witness.c:776 mtx_enter(ffffffff83a05b00) at mtx_enter+0x47 sys/kern/kern_lock.c:238 msleep(ffffffff83a05974,ffffffff83a05b00,7f,ffffffff8337c8bd,0) at msleep+0x2cf sys/kern/kern_synch.c:237 uvm_pagezero_thread(ffff8000ffffc008) at uvm_pagezero_thread+0xe9 sys/uvm/uvm_pmemrange.c:2210 end trace frame: 0x0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff8380fff0) 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(ffffffff838e3dc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838e3dc0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a258910,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_const_cmp4(1,3) at __sanitizer_cov_trace_const_cmp4+0x2e kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_const_cmp4(1,3) at __sanitizer_cov_trace_const_cmp4+0x2e sys/dev/kcov.c:230 witness_checkorder(ffffffff83a05b10,9,0) at witness_checkorder+0x5a sys/kern/subr_witness.c:776 mtx_enter(ffffffff83a05b00) at mtx_enter+0x47 sys/kern/kern_lock.c:238 msleep(ffffffff83a05974,ffffffff83a05b00,7f,ffffffff8337c8bd,0) at msleep+0x2cf sys/kern/kern_synch.c:237 uvm_pagezero_thread(ffff8000ffffc008) at uvm_pagezero_thread+0xe9 sys/uvm/uvm_pmemrange.c:2210 end trace frame: 0x0, count: -11 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(ffffffff833e0af8) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83a05ac8) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83a05ac8) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80083346d0) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80083346d0) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80083346d0) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8067efd0d8,1000,ffff8000383eb6d8,ffff8000383eb6b4,0,2,6e1cb88f1be7d9ec,ffff8000383eb930) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000383eb8f8,ffff8000383eb930,ffff8000383eb760,ffff8000383eb768) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff8000383eb8f8,ffff8000383eb930,ffff8000383eb870) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806be3ed50,200000001000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000383eba80,2000000011c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000383eba80) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7e8fcc5674c0, count: 2 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833e0af8) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83a05ac8) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83a05ac8) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd80083346d0) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd80083346d0) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd80083346d0) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd8067efd0d8,1000,ffff8000383eb6d8,ffff8000383eb6b4,0,2,6e1cb88f1be7d9ec,ffff8000383eb930) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff8000383eb8f8,ffff8000383eb930,ffff8000383eb760,ffff8000383eb768) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff8000383eb8f8,ffff8000383eb930,ffff8000383eb870) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806be3ed50,200000001000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000383eba80,2000000011c0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000383eba80) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7e8fcc5674c0, count: -13