panic: pool_do_get: shmpl free list modified: page 0xfffffd800dc03000; item addr 0xfffffd800dc03770; offset 0x40=0x6828b876 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 30482 99296 32767 0x10 0x4000000 1K syz-executor 453011 92226 32767 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833cd671) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83946fc0,1,ffff80003ac1f6c8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff83946fc0,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c45b220,ffff80003ac1f920,5d,ffff80003ac1f870) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c45b220,ffff80003ac1f920,ffff80003ac1f870) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003ac1f920) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac1f920) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc004dc24b10, 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: pool_do_get: shmpl free list modified: page 0xfffffd800dc03000; item addr 0xfffffd800dc03770; offset 0x40=0x6828b876 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833cd671) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83946fc0,1,ffff80003ac1f6c8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff83946fc0,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c45b220,ffff80003ac1f920,5d,ffff80003ac1f870) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c45b220,ffff80003ac1f920,ffff80003ac1f870) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003ac1f920) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac1f920) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc004dc24b10, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003ac1f500 rbx 0xffff8000299dedd7 rdx 0xffff800001465a40 rcx 0xffff80003c45b220 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x7101134f885e6bd r11 0x306f69d22e365e59 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff818009f5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003ac1f4f0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=30482 pid=99296 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c45a550,0xffffffff83989550 process=0xffff800039413408 user=0xffff80003ac1a000, vmspace=0xfffffd806c171020 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 99296 285352 68234 32767 2 0x10 syz-executor *99296 30482 68234 32767 7 0x4000010 syz-executor 92226 45044 58035 32767 2 0x10 syz-executor 92226 453011 58035 32767 7 0x4000010 syz-executor 55781 167841 63156 32767 2 0xc90 syz-executor 55781 467720 63156 32767 3 0x4000090 fsleep syz-executor 55781 48956 63156 32767 3 0x4000090 ttyout syz-executor 55781 351729 63156 32767 3 0x4000090 fsleep syz-executor 99428 45573 48488 32767 2 0xc90 syz-executor 99428 218243 48488 32767 3 0x4000090 kqsel syz-executor 99428 48943 48488 32767 3 0x4000090 fsleep syz-executor 99428 284323 48488 32767 3 0x4000090 fsleep syz-executor 22845 356437 0 0 3 0x14200 bored sosplice 68234 182142 75865 32767 3 0x90 nanoslp syz-executor 48488 235639 18598 32767 2 0xc90 syz-executor 58035 164482 63088 32767 2 0xc90 syz-executor 3641 524022 66213 32767 2 0x10 syz-executor 92212 291218 15491 32767 2 0xc90 syz-executor 63156 179172 8695 32767 2 0xc90 syz-executor 65223 272620 51501 0 3 0x82 wait syz-executor 18598 280675 51501 0 3 0x82 wait syz-executor 75865 358014 51501 0 3 0x82 wait syz-executor 66213 201920 51501 0 3 0x82 wait syz-executor 15491 290154 51501 0 3 0x82 wait syz-executor 8695 206311 51501 0 3 0x82 wait syz-executor 63088 183221 51501 0 3 0x82 wait syz-executor 1514 211443 51501 0 3 0x82 wait syz-executor 51501 258716 28312 0 3 0x82 kqread syz-executor 28312 516719 84244 0 3 0x10008a sigsusp ksh 84244 216558 86033 0 3 0x98 kqread sshd-session 86033 411625 89526 0 3 0x92 kqread sshd-session 54062 398330 1 0 3 0x100083 ttyin getty 89526 340771 1 0 3 0x88 kqread sshd 78938 186610 49437 73 3 0x1100090 kqread syslogd 49437 92475 1 0 3 0x100082 sbwait syslogd 37310 523050 1 0 3 0x100080 kqread resolvd 18779 422370 82820 77 3 0x100092 kqread dhcpleased 38372 346764 82820 77 3 0x100092 kqread dhcpleased 82820 504511 1 0 3 0x80 kqread dhcpleased 73420 501309 0 0 2 0x40014200 smr 62837 498546 0 0 2 0x14200 zerothread 10700 267519 0 0 3 0x14200 aiodoned aiodoned 47623 143135 0 0 3 0x14200 syncer update 82627 201919 0 0 3 0x14200 cleaner cleaner 17404 10038 0 0 3 0x14200 reaper reaper 28876 463331 0 0 3 0x14200 pgdaemon pagedaemon 43678 253598 0 0 3 0x14200 bored viomb 43925 94550 0 0 3 0x40014200 acpi0 acpi0 50913 272013 0 0 3 0x40014200 idle1 50394 215574 0 0 3 0x14200 bored softnet3 53037 3160 0 0 3 0x14200 bored softnet2 73489 468172 0 0 3 0x14200 bored softnet1 25407 222563 0 0 3 0x14200 bored softnet0 28875 208418 0 0 3 0x14200 bored systqmp 85565 208955 0 0 3 0x14200 bored systq 15980 220093 0 0 3 0x14200 tmoslp softclockmp 54346 318190 0 0 3 0x40014200 tmoslp softclock 96454 469444 0 0 3 0x40014200 idle0 1 454967 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex shmpl r = 0 (0xffffffff83946fd8) #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 pool_get+0x10b sys/kern/subr_pool.c:583 #4 shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 #5 sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #7 Xsyscall+0x128 Process 99296 (syz-executor) thread 0xffff80003c45b220 (30482) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83923170) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #1 syscall+0xae6 sys/arch/amd64/amd64/trap.c:579 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff83946fd8) #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 pool_get+0x10b sys/kern/subr_pool.c:583 #4 shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 #5 sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #7 Xsyscall+0x128 Process 3641 (syz-executor) thread 0xffff80002a286a58 (524022) exclusive rrwlock inode r = 0 (0xfffffd806bf8bd40) #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:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #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:3109 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807cee0e50) #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:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #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:3094 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10221 10959K 10966K 166960K 11300 0 pcb 17 12K 12K 166960K 17 0 rtable 240 6K 7K 166960K 364 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 3 1K 9K 166960K 8 0 counters 66 36K 36K 166960K 66 0 ioctlops 0 0K 2K 166960K 32 0 iov 0 0K 16K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1395 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 23 85K 117K 166960K 335 0 sigio 1 0K 0K 166960K 8 0 proc 58 79K 115K 166960K 493 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 28 0 in_multi 99 7K 7K 166960K 103 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 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 432 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 252 184K 217K 166960K 4613 0 UVM aobj 12 2K 2K 166960K 13 0 pinsyscall 44 88K 108K 166960K 1365 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 27 0 NDP 11 0K 2K 166960K 27 0 temp 43 8672K 8737K 166960K 5369 0 kqueue 13 20K 31K 166960K 63 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 56 0 53 1 0 1 1 0 8 0 rtentry 176 114 0 1 6 0 6 6 0 8 0 unpcb 144 272 0 252 2 0 2 2 0 8 1 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 136 0 131 7 0 7 7 0 8 6 arp 128 19 0 0 1 0 1 1 0 8 0 ipq 40 3 0 1 1 0 1 1 0 8 0 ipqe 40 5 0 2 1 0 1 1 0 8 0 inpcb 384 274 0 262 8 0 8 8 0 8 6 nd6 144 26 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 256 471 0 0 30 0 30 30 0 8 0 art_table 32 472 0 0 4 0 4 4 0 8 0 art_node 16 113 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semapl 112 14 0 4 1 0 1 1 0 8 0 shmpl 112 10 0 1 1 0 1 1 0 8 0 pool(0xffffffff83946fc0:shmpl): page inconsistency: page 0xfffffd800dc03000; 25 on list, 9 missing, 35 items per page dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1859 0 349 95 0 95 95 0 8 0 ffsino 288 1859 0 349 108 0 108 108 0 8 0 nchpl 144 2327 0 646 63 0 63 63 0 8 0 uvmvnodes 80 1940 0 0 40 0 40 40 0 8 0 vnodes 216 1940 0 0 108 0 108 108 0 8 0 namei 1024 9614 0 9613 1 0 1 1 0 8 0 percpumem 16 48 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 7519 0 7519 9 1 8 8 1 8 8 plimitpl 152 127 0 102 2 0 2 2 0 8 0 sigapl 424 617 0 563 7 0 7 7 0 8 0 knotepl 120 547 0 0 17 0 17 17 0 8 0 kqueuepl 224 86 0 74 1 0 1 1 0 8 0 pipepl 336 126 0 97 3 0 3 3 0 8 0 fdescpl 520 598 0 563 3 0 3 3 0 8 0 filepl 160 2752 0 2528 13 0 13 13 0 8 2 lockfpl 104 61 0 59 1 0 1 1 0 8 0 lockfspl 48 22 0 20 1 0 1 1 0 8 0 sessionpl 144 22 0 6 1 0 1 1 0 8 0 pgrppl 48 32 0 8 1 0 1 1 0 8 0 ucredpl 104 480 0 461 1 0 1 1 0 8 0 zombiepl 144 566 0 563 1 0 1 1 0 8 0 processpl 1208 617 0 563 5 0 5 5 0 8 0 procpl 656 973 0 911 7 0 7 7 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 728 603 0 569 9 0 9 9 0 8 5 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 220 0 0 14 0 14 14 0 8 0 bufpl 280 2514 0 117 172 0 172 172 0 8 0 anonpl 32 5337 0 0 44 0 44 44 0 246 0 amapchunkpl 152 14532 0 13986 40 0 40 40 0 158 13 amappl16 200 2173 0 2072 8 2 6 6 0 8 0 amappl15 192 6 0 6 2 1 1 1 0 8 1 amappl14 184 103 0 93 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 1 1 1 0 8 1 amappl12 168 1209 0 1174 2 0 2 2 0 8 0 amappl11 160 42 0 32 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 255 0 253 1 0 1 1 0 8 0 amappl8 136 24 0 22 1 0 1 1 0 8 0 amappl7 128 93 0 83 1 0 1 1 0 8 0 amappl6 120 185 0 182 1 0 1 1 0 8 0 amappl5 112 123 0 117 1 0 1 1 0 8 0 amappl4 104 281 0 265 1 0 1 1 0 8 0 amappl3 96 2476 0 2357 4 0 4 4 0 8 0 amappl2 88 611 0 557 2 0 2 2 0 8 0 amappl1 80 8900 0 8331 14 0 14 14 0 8 0 amappl 88 3931 0 3747 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 12 0 1 1 0 1 1 0 8 0 uaddrrnd 24 598 0 563 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 598 0 563 1 0 1 1 0 8 0 vmmpekpl 168 6397 0 6359 3 0 3 3 0 8 0 vmmpepl 168 44016 0 41916 97 0 97 97 0 357 1 vmsppl 480 597 0 563 7 1 6 6 0 8 1 rwobjpl 72 16276 0 13408 53 0 53 53 0 8 0 pdppl 4096 1203 0 1126 111 28 83 93 0 8 6 pvpl 32 11387 0 0 92 0 92 92 0 265 0 pmappl 256 597 0 563 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 400 0 31 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838b0ff0) 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(ffffffff83922f68) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83922f68) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:840 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x54 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x54 sys/dev/kcov.c:153 witness_lock(fffffd806c171e40,1) at witness_lock+0xcb sys/kern/subr_witness.c:1164 rw_do_enter_read(fffffd806c171e28,0) at rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 uvmfault_lookup(ffff80003c448d90,0) at uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 uvm_fault_check(ffff80003c448d90,ffff80003c448dc8,ffff80003c448e00,0) at uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 uvm_fault(fffffd806c171d40,4b6000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:677 kpageflttrap(ffff80003c448f40,4b6e40) at kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 end trace frame: 0xffff80003c448f30, count: 0 ddb{0}> trace x86_ipi_db(ffffffff838b0ff0) 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(ffffffff83922f68) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83922f68) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:840 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x54 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x54 sys/dev/kcov.c:153 witness_lock(fffffd806c171e40,1) at witness_lock+0xcb sys/kern/subr_witness.c:1164 rw_do_enter_read(fffffd806c171e28,0) at rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 uvmfault_lookup(ffff80003c448d90,0) at uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 uvm_fault_check(ffff80003c448d90,ffff80003c448dc8,ffff80003c448e00,0) at uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 uvm_fault(fffffd806c171d40,4b6000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:677 kpageflttrap(ffff80003c448f40,4b6e40) at kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 kerntrap(ffff80003c448f40) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80003c449390) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c449390) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x259b2af5b40, count: -19 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(ffffffff833cd671) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83946fc0,1,ffff80003ac1f6c8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff83946fc0,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c45b220,ffff80003ac1f920,5d,ffff80003ac1f870) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c45b220,ffff80003ac1f920,ffff80003ac1f870) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003ac1f920) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac1f920) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc004dc24b10, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833cd671) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83946fc0,1,ffff80003ac1f6c8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff83946fc0,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c45b220,ffff80003ac1f920,5d,ffff80003ac1f870) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c45b220,ffff80003ac1f920,ffff80003ac1f870) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003ac1f920) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003ac1f920) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc004dc24b10, count: -8