panic: pool_do_get: shmpl free list modified: page 0xfffffd806248f000; item addr 0xfffffd806248f540; offset 0x40=0x68745136 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 154448 10382 32767 0x10 0 0 syz-executor * 54875 10382 32767 0x10 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833d6ff0) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398a760,1,ffff80002a2f4208) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff8398a760,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000ffff1210,ffff80002a2f4460,100,ffff80002a2f43b0) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000ffff1210,ffff80002a2f4460,ffff80002a2f43b0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a2f4460) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2f4460) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc70e78674f0, 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 0xfffffd806248f000; item addr 0xfffffd806248f540; offset 0x40=0x68745136 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833d6ff0) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398a760,1,ffff80002a2f4208) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff8398a760,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000ffff1210,ffff80002a2f4460,100,ffff80002a2f43b0) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000ffff1210,ffff80002a2f4460,ffff80002a2f43b0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a2f4460) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2f4460) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc70e78674f0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a2f4040 rbx 0xffff8000299dedd7 rdx 0xffff80000143b980 rcx 0xffff8000ffff1210 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8b0bcb40b3afb16f r11 0x94d17a19b711af44 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff81f73f45 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a2f4030 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=54875 pid=10382 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=63, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff1c50,0xffffffff8393bab8 process=0xffff80003b0104f8 user=0xffff80002a2ef000, vmspace=0xfffffd8069c82990 estcpu=13, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 52596 326806 95932 32767 2 0x10 syz-executor 10382 154448 91387 32767 7 0x10 syz-executor *10382 54875 91387 32767 7 0x4000010 syz-executor 68730 303190 20194 32767 2 0x10 syz-executor 88501 593 30720 32767 2 0x10 syz-executor 89573 406075 76063 0 2 0x2 syz-executor 40597 397005 0 0 3 0x14200 bored sosplice 36551 112457 77721 32767 3 0x90 piperd syz-executor 28526 414025 35619 32767 3 0x90 piperd syz-executor 30720 414388 76421 32767 3 0x90 nanoslp syz-executor 95932 245925 12887 32767 2 0x10 syz-executor 45548 5516 67526 32767 3 0x90 piperd syz-executor 20194 432924 97471 32767 3 0x90 nanoslp syz-executor 91387 450449 53657 32767 3 0x90 nanoslp syz-executor 77721 222027 76063 0 3 0x82 wait syz-executor 35619 365958 76063 0 3 0x82 wait syz-executor 67526 296931 76063 0 3 0x82 wait syz-executor 12887 64730 76063 0 3 0x82 wait syz-executor 53657 269279 76063 0 3 0x82 wait syz-executor 97471 426389 76063 0 3 0x82 wait syz-executor 76421 270948 76063 0 3 0x82 wait syz-executor 76063 259371 40359 0 2 0x2 syz-executor 40359 372889 71205 0 3 0x10008a sigsusp ksh 71205 12949 15847 0 3 0x98 kqread sshd-session 15847 202295 56413 0 3 0x92 kqread sshd-session 31790 225240 1 0 3 0x100083 ttyin getty 56413 280654 1 0 3 0x88 kqread sshd 94068 252279 93564 73 3 0x1100090 kqread syslogd 93564 383591 1 0 3 0x100082 sbwait syslogd 2618 478752 1 0 3 0x100080 kqread resolvd 80584 121838 62882 77 3 0x100092 kqread dhcpleased 11583 18541 62882 77 3 0x100092 kqread dhcpleased 62882 154601 1 0 3 0x80 kqread dhcpleased 24348 432791 0 0 3 0x14200 bored smr 42748 381947 0 0 2 0x14200 zerothread 82912 302751 0 0 3 0x14200 aiodoned aiodoned 23382 232473 0 0 3 0x14200 syncer update 57449 85349 0 0 3 0x14200 cleaner cleaner 19485 80776 0 0 3 0x14200 reaper reaper 43262 415537 0 0 3 0x14200 pgdaemon pagedaemon 98007 394339 0 0 3 0x14200 bored viomb 34005 209616 0 0 3 0x40014200 acpi0 acpi0 17161 167559 0 0 3 0x40014200 idle1 52715 426650 0 0 3 0x14200 bored softnet3 99981 246742 0 0 3 0x14200 bored softnet2 85411 375102 0 0 3 0x14200 bored softnet1 84051 283186 0 0 2 0x14200 softnet0 93927 202577 0 0 3 0x14200 bored systqmp 79271 478303 0 0 3 0x14200 bored systq 73688 48144 0 0 3 0x14200 tmoslp softclockmp 51299 146339 0 0 3 0x40014200 tmoslp softclock 54475 38129 0 0 3 0x40014200 idle0 1 76754 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 (0xffffffff8398a778) #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+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pool_get+0x10b sys/kern/subr_pool.c:578 #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:748 #7 Xsyscall+0x128 Process 10382 (syz-executor) thread 0xffff8000ffff1210 (54875) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a1d2d0) #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:748 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff8398a778) #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+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pool_get+0x10b sys/kern/subr_pool.c:578 #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:748 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10189 10953K 10967K 166960K 11270 0 pcb 17 12K 12K 166960K 17 0 rtable 221 6K 7K 166960K 362 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 3 1K 9K 166960K 11 0 counters 66 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 39 0 iov 0 0K 24K 166960K 30 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1462 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 21 74K 129K 166960K 504 0 sigio 0 0K 0K 166960K 8 0 proc 58 79K 115K 166960K 500 0 subproc 63 3K 4K 166960K 162 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 63 0 in_multi 88 6K 7K 166960K 111 0 ether_multi 1 0K 0K 166960K 3 0 mrt 2 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 409 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 195 150K 186K 166960K 5966 0 UVM aobj 14 3K 3K 166960K 15 0 pinsyscall 42 84K 114K 166960K 1518 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 28 0 NDP 10 0K 2K 166960K 27 0 temp 41 8676K 8742K 166960K 5276 0 kqueue 13 20K 32K 166960K 102 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 53 0 50 1 0 1 1 0 8 0 rtentry 176 115 0 13 6 0 6 6 0 8 0 unpcb 144 543 0 528 6 3 3 6 0 8 2 syncache 336 8 0 7 1 0 1 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 196 0 189 7 2 5 7 0 8 4 arp 128 19 0 2 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 328 506 0 495 7 0 7 7 0 8 5 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 2 0 0 1 0 1 1 0 8 0 nd6 144 27 0 4 1 0 1 1 0 8 0 kcovpl 48 18 0 11 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 458 0 46 29 0 29 29 0 8 1 art_table 40 459 0 46 5 0 5 5 0 8 0 art_node 32 115 0 22 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 12 0 1 1 0 1 1 0 8 0 pool(0xffffffff8398a760:shmpl): page inconsistency: page 0xfffffd806248f000; 23 on list, 11 missing, 35 items per page dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2021 0 502 96 0 96 96 0 8 0 ffsino 288 2021 0 502 109 0 109 109 0 8 0 nchpl 144 2658 0 976 63 0 63 63 0 8 0 uvmvnodes 80 2192 0 0 45 0 45 45 0 8 0 vnodes 216 2192 0 0 122 0 122 122 0 8 0 namei 1024 8240 0 8240 2 1 1 2 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 8648 0 8648 10 3 7 8 1 8 7 plimitpl 152 126 0 103 2 0 2 2 0 8 1 sigapl 424 759 0 707 8 0 8 8 0 8 0 knotepl 120 561 0 0 17 0 17 17 0 8 0 kqueuepl 224 142 0 133 2 0 2 2 0 8 1 pipepl 336 161 0 134 3 0 3 3 0 8 0 fdescpl 520 740 0 707 4 0 4 4 0 8 1 filepl 160 3823 0 3627 16 2 14 16 0 8 5 lockfpl 104 113 0 111 1 0 1 1 0 8 0 lockfspl 48 40 0 38 1 0 1 1 0 8 0 sessionpl 144 35 0 20 1 0 1 1 0 8 0 pgrppl 48 59 0 36 1 0 1 1 0 8 0 ucredpl 104 522 0 504 1 0 1 1 0 8 0 zombiepl 144 707 0 707 1 0 1 1 0 8 1 processpl 1240 759 0 707 5 0 5 5 0 8 0 procpl 656 1312 0 1259 7 1 6 7 0 8 0 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 728 1107 0 1078 16 7 9 16 0 8 5 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 38 0 0 5 0 5 5 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 252 0 0 16 0 16 16 0 8 0 bufpl 280 2756 0 116 189 0 189 189 0 8 0 anonpl 32 10514 0 0 85 0 85 85 0 246 0 amapchunkpl 152 19463 0 19086 40 3 37 40 0 158 19 amappl16 200 1833 0 1817 17 6 11 14 0 8 8 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 108 0 98 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1337 0 1306 2 0 2 2 0 8 0 amappl11 160 42 0 32 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 259 0 259 1 1 0 1 0 8 0 amappl8 136 36 0 35 1 0 1 1 0 8 0 amappl7 128 97 0 87 1 0 1 1 0 8 0 amappl6 120 180 0 177 1 0 1 1 0 8 0 amappl5 112 121 0 115 1 0 1 1 0 8 0 amappl4 104 289 0 274 1 0 1 1 0 8 0 amappl3 96 3434 0 3344 4 0 4 4 0 8 0 amappl2 88 628 0 570 2 0 2 2 0 8 0 amappl1 80 10105 0 9553 15 1 14 14 0 8 1 amappl 88 5258 0 5126 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 14 0 1 1 0 1 1 0 8 0 uaddrrnd 24 740 0 707 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 740 0 707 1 0 1 1 0 8 0 vmmpekpl 168 7864 0 7820 3 0 3 3 0 8 0 vmmpepl 168 52346 0 50513 106 3 103 106 0 357 12 vmsppl 480 739 0 707 7 1 6 6 0 8 0 rwobjpl 72 18229 0 15261 57 0 57 57 0 8 1 pdppl 4096 1487 0 1414 119 38 81 99 0 8 8 pvpl 32 18940 0 0 153 0 153 153 0 265 0 pmappl 256 739 0 707 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 416 0 44 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83867ff0) 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(ffffffff83a1d0c8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a1d0c8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7c5469c9e800, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83867ff0) 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(ffffffff83a1d0c8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a1d0c8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7c5469c9e800, count: -7 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(ffffffff833d6ff0) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398a760,1,ffff80002a2f4208) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff8398a760,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000ffff1210,ffff80002a2f4460,100,ffff80002a2f43b0) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000ffff1210,ffff80002a2f4460,ffff80002a2f43b0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a2f4460) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2f4460) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc70e78674f0, count: 7 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833d6ff0) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff8398a760,1,ffff80002a2f4208) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff8398a760,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff8000ffff1210,ffff80002a2f4460,100,ffff80002a2f43b0) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff8000ffff1210,ffff80002a2f4460,ffff80002a2f43b0) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a2f4460) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2f4460) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc70e78674f0, count: -8