panic: pool_do_get: shmpl free list modified: page 0xfffffd806b693000; item addr 0xfffffd806b6935b0; offset 0x40=0x6890c37c Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 133296 19512 32767 0x10 0 1 syz-executor *148846 19512 32767 0x10 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336b32d) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838ccd70,1,ffff80002f3fb3e8) at pool_do_get+0x5df pool_get(ffffffff838ccd70,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80002a3727f0,ffff80002f3fb640,0,ffff80002f3fb590) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80002a3727f0,ffff80002f3fb640,ffff80002f3fb590) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f3fb640) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f3fb640) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaec20012be0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: pool_do_get: shmpl free list modified: page 0xfffffd806b693000; item addr 0xfffffd806b6935b0; offset 0x40=0x6890c37c ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336b32d) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838ccd70,1,ffff80002f3fb3e8) at pool_do_get+0x5df pool_get(ffffffff838ccd70,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80002a3727f0,ffff80002f3fb640,0,ffff80002f3fb590) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80002a3727f0,ffff80002f3fb640,ffff80002f3fb590) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f3fb640) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f3fb640) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaec20012be0, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002f3fb210 rbx 0xffffffff8384fddf cpu_info_full_primary+0x2ddf rdx 0xffff8000014610c0 rcx 0xffff80002a3727f0 rax 0xffffffff8384eff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x676bc49f974acf66 r11 0x61661e1b6844d364 r12 0xffffffff8384fbe0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff828d3935 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002f3fb200 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=148846 pid=19512 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=0xffff80002a372028,0xffffffff839c5b80 process=0xffff80003c4753b0 user=0xffff80002f3f6000, vmspace=0xfffffd806bcead78 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 19512 133296 62284 32767 7 0x10 syz-executor *19512 148846 62284 32767 7 0x4000010 syz-executor 84430 362617 33686 0 2 0x2 syz-executor 48808 487385 42300 32767 3 0x90 nanoslp syz-executor 48808 322356 42300 32767 3 0x4000090 kqsel syz-executor 48808 321084 42300 32767 3 0x4000090 fsleep syz-executor 58850 62345 70918 32767 3 0x90 nanoslp syz-executor 58850 73474 70918 32767 3 0x4000090 kqread syz-executor 58850 295910 70918 32767 3 0x4000090 fsleep syz-executor 29766 426348 54554 32767 3 0x90 nanoslp syz-executor 29766 108750 54554 32767 3 0x4000090 sbwait syz-executor 29766 363439 54554 32767 3 0x4000090 fsleep syz-executor 53191 361252 0 0 3 0x14200 bored sosplice 47892 78666 39254 32767 3 0x90 nanoslp syz-executor 42300 118729 47699 32767 3 0x90 nanoslp syz-executor 53817 509729 64174 32767 3 0x90 nanoslp syz-executor 80464 243240 59991 32767 3 0x90 nanoslp syz-executor 62284 315617 70093 32767 3 0x90 nanoslp syz-executor 70918 371612 54797 32767 3 0x90 nanoslp syz-executor 54554 488411 86603 32767 2 0x10 syz-executor 64174 222542 33686 0 3 0x82 wait syz-executor 39254 489425 33686 0 3 0x82 wait syz-executor 59991 170549 33686 0 3 0x82 wait syz-executor 70093 146345 33686 0 3 0x82 wait syz-executor 54797 425680 33686 0 3 0x82 wait syz-executor 47699 344022 33686 0 3 0x82 wait syz-executor 86603 298778 33686 0 3 0x82 wait syz-executor 33686 315436 93883 0 3 0x82 kqread syz-executor 93883 264360 36098 0 3 0x10008a sigsusp ksh 36098 204414 89495 0 3 0x98 kqread sshd-session 89495 243966 39538 0 3 0x92 kqread sshd-session 36984 477158 1 0 3 0x100083 ttyin getty 39538 513513 1 0 3 0x88 kqread sshd 41363 238631 9339 73 3 0x1100090 kqread syslogd 9339 6102 1 0 3 0x100082 sbwait syslogd 7573 510034 1 0 3 0x100080 kqread resolvd 24632 117637 94175 77 3 0x100092 kqread dhcpleased 55756 370695 94175 77 3 0x100092 kqread dhcpleased 94175 482321 1 0 3 0x80 kqread dhcpleased 76144 8235 0 0 3 0x14200 bored smr 42788 113988 0 0 2 0x14200 zerothread 23945 20521 0 0 3 0x14200 aiodoned aiodoned 87584 436885 0 0 3 0x14200 syncer update 28934 63046 0 0 3 0x14200 cleaner cleaner 95394 279158 0 0 3 0x14200 reaper reaper 56693 165407 0 0 3 0x14200 pgdaemon pagedaemon 85904 309386 0 0 3 0x14200 bored viomb 23490 262839 0 0 3 0x40014200 acpi0 acpi0 74753 375380 0 0 3 0x40014200 idle1 80518 476433 0 0 3 0x14200 bored softnet7 11507 193978 0 0 3 0x14200 bored softnet6 23192 331713 0 0 3 0x14200 bored softnet5 11854 482135 0 0 3 0x14200 bored softnet4 1430 366861 0 0 3 0x14200 bored softnet3 2132 517495 0 0 3 0x14200 bored softnet2 20933 282991 0 0 3 0x14200 bored softnet1 88988 128890 0 0 3 0x14200 bored softnet0 58871 397433 0 0 3 0x14200 smrbar systqmp 84749 108355 0 0 3 0x14200 bored systq 325 221000 0 0 3 0x14200 tmoslp softclockmp 52981 380696 0 0 3 0x40014200 tmoslp softclock 64588 88909 0 0 3 0x40014200 idle0 1 288784 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex shmpl r = 0 (0xffffffff838ccd88) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pool_get+0x124 sys/kern/subr_pool.c:581 #4 shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 #5 sys_shmget+0x195 sys/kern/sysv_shm.c:482 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 Process 19512 (syz-executor) thread 0xffff80002a3727f0 (148846) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8398e378) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:748 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff838ccd88) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pool_get+0x124 sys/kern/subr_pool.c:581 #4 shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 #5 sys_shmget+0x195 sys/kern/sysv_shm.c:482 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 Process 58871 (systqmp) thread 0xffff8000ffffea60 (397433) shared rwlock systqmp r = 0 (0xffffffff8386cce8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 10955K 10968K 166960K 11276 0 pcb 17 12K 12K 166960K 17 0 rtable 195 5K 6K 166960K 279 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 2 1K 9K 166960K 7 0 counters 66 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 32 0 iov 0 0K 12K 166960K 10 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 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 16 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 17 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 125K 166960K 365 0 sigio 0 0K 0K 166960K 9 0 proc 58 99K 147K 166960K 505 0 subproc 65 4K 4K 166960K 101 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 42 0 in_multi 90 6K 7K 166960K 109 0 ether_multi 1 0K 0K 166960K 2 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 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 363 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 258 160K 175K 166960K 4900 0 UVM aobj 27 5K 5K 166960K 29 0 pinsyscall 45 90K 112K 166960K 1392 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 20 0 NDP 10 0K 2K 166960K 27 0 temp 40 8639K 8766K 166960K 4671 0 kqueue 16 26K 29K 166960K 83 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 46 0 43 1 0 1 1 0 8 0 rtentry 176 102 0 13 5 0 5 5 0 8 0 unpcb 144 307 0 290 6 0 6 6 0 8 5 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 95 0 83 2 0 2 2 0 8 0 arp 128 10 0 1 1 0 1 1 0 8 0 ipq 40 4 0 0 1 0 1 1 0 8 0 ipqe 40 4 0 0 1 0 1 1 0 8 0 inpcb 328 350 0 332 7 0 7 7 0 8 5 nd6 144 23 0 5 1 0 1 1 0 8 0 kcovpl 48 11 0 4 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 465 0 11 29 0 29 29 0 8 0 art_table 40 466 0 11 5 0 5 5 0 8 0 art_node 32 102 0 14 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 1 0 1 1 0 8 1 semupl 112 4 0 4 1 0 1 1 0 8 1 semapl 112 15 0 5 1 0 1 1 0 8 0 shmpl 112 26 0 2 1 0 1 1 0 8 0 pool(0xffffffff838ccd70:shmpl): page inconsistency: page 0xfffffd806b693000; 10 on list, 24 missing, 35 items per page dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 1876 0 360 95 0 95 95 0 8 0 ffsino 296 1876 0 360 117 0 117 117 0 8 0 nchpl 144 2359 0 674 63 0 63 63 0 8 0 uvmvnodes 80 1986 0 0 41 0 41 41 0 8 0 vnodes 216 1986 0 0 111 0 111 111 0 8 0 namei 1024 7379 0 7379 1 0 1 1 0 8 1 percpumem 16 49 0 1 1 0 1 1 0 8 0 kstatmem 264 24 0 2 2 0 2 2 0 8 0 scxspl 216 8353 0 8353 10 2 8 8 1 8 8 plimitpl 152 118 0 93 2 0 2 2 0 8 0 sigapl 424 641 0 582 8 0 8 8 0 8 0 knotepl 120 316 0 0 10 0 10 10 0 8 0 kqueuepl 224 88 0 74 1 0 1 1 0 8 0 pipepl 344 129 0 102 3 0 3 3 0 8 0 fdescpl 528 618 0 582 4 0 4 4 0 8 0 filepl 160 2995 0 2773 18 0 18 18 0 8 8 lockfpl 104 60 0 57 1 0 1 1 0 8 0 lockfspl 48 23 0 20 1 0 1 1 0 8 0 sessionpl 144 27 0 12 1 0 1 1 0 8 0 pgrppl 48 46 0 23 1 0 1 1 0 8 0 ucredpl 104 466 0 448 1 0 1 1 0 8 0 zombiepl 144 585 0 582 1 0 1 1 0 8 0 processpl 1248 641 0 582 7 1 6 6 0 8 0 procpl 664 1001 0 935 7 0 7 7 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 752 720 0 682 23 11 12 23 0 8 8 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 235 0 0 15 0 15 15 0 8 0 bufpl 280 3068 0 116 211 0 211 211 0 8 0 anonpl 32 11681 0 0 95 0 95 95 0 246 0 amapchunkpl 152 28354 0 27774 42 3 39 39 0 158 14 amappl16 200 3028 0 3004 28 18 10 27 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 111 0 101 1 0 1 1 0 8 0 amappl13 176 3 0 2 1 0 1 1 0 8 0 amappl12 168 1227 0 1191 2 0 2 2 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 1 0 1 1 1 0 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 27 0 26 1 0 1 1 0 8 0 amappl7 128 96 0 86 1 0 1 1 0 8 0 amappl6 120 194 0 191 1 0 1 1 0 8 0 amappl5 112 116 0 109 1 0 1 1 0 8 0 amappl4 104 280 0 264 1 0 1 1 0 8 0 amappl3 96 2666 0 2533 4 0 4 4 0 8 0 amappl2 88 619 0 565 2 0 2 2 0 8 0 amappl1 80 9438 0 8861 14 0 14 14 0 8 0 amappl 88 4207 0 4014 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 28 0 2 1 0 1 1 0 8 0 uaddrrnd 24 618 0 582 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 618 0 582 1 0 1 1 0 8 0 vmmpekpl 168 6718 0 6681 2 0 2 2 0 8 0 vmmpepl 168 46517 0 44417 120 0 120 120 0 357 24 vmsppl 488 617 0 582 7 1 6 6 0 8 0 rwobjpl 80 18011 0 15137 66 0 66 66 0 8 4 pdppl 4096 1243 0 1164 111 28 83 97 0 8 4 pvpl 32 20714 0 0 169 1 168 168 0 265 0 pmappl 256 617 0 582 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 287 0 31 8 0 8 8 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(ffffffff8336b32d) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff838ccd70,1,ffff80002f3fb3e8) at pool_do_get+0x5df pool_get(ffffffff838ccd70,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80002a3727f0,ffff80002f3fb640,0,ffff80002f3fb590) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80002a3727f0,ffff80002f3fb640,ffff80002f3fb590) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80002f3fb640) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f3fb640) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaec20012be0, count: -8 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 end of kernel end trace frame: 0x7283eb5f8af0, count: 12 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 end of kernel end trace frame: 0x7283eb5f8af0, count: -3