panic: pool_do_get: shmpl free list modified: page 0xfffffd806b010000; item addr 0xfffffd806b010380; offset 0x40=0x67ae55be Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *143682 90234 32767 0x10 0x4000000 0K syz-executor 95337 24794 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a8b32) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839bf400,1,ffff80002a898858) at pool_do_get+0x5da pool_get(ffffffff839bf400,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff6a60,ffff80002a898ab0,d0,ffff80002a898a00) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff6a60,ffff80002a898ab0,ffff80002a898a00) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a898ab0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a898ab0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x191da0363b0, 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 0xfffffd806b010000; item addr 0xfffffd806b010380; offset 0x40=0x67ae55be ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a8b32) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839bf400,1,ffff80002a898858) at pool_do_get+0x5da pool_get(ffffffff839bf400,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff6a60,ffff80002a898ab0,d0,ffff80002a898a00) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff6a60,ffff80002a898ab0,ffff80002a898a00) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a898ab0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a898ab0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x191da0363b0, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a898690 rbx 0xffffffff83864dc7 cpu_info_full_primary+0x2dc7 rdx 0xffff800001437ac0 rcx 0xffff8000ffff6a60 rax 0xffffffff83863ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xf058e535ff49dbeb r11 0xa21f8c7f61cbf123 r12 0xffffffff83864bc8 cpu_info_full_primary+0x2bc8 r13 0 r14 0 r15 0x1 rip 0xffffffff82c3c5a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a898680 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=143682 pid=90234 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff7730,0xffff8000ffff79d0 process=0xffff80003acfe260 user=0xffff80002a893000, vmspace=0xfffffd800bacf1f8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21129 285430 27275 32767 2 0x10 syz-executor 21129 79189 27275 32767 3 0x4000090 fsleep syz-executor 90234 515548 56638 32767 2 0x10 syz-executor *90234 143682 56638 32767 7 0x4000010 syz-executor 82928 112753 3321 32767 3 0x90 nanoslp syz-executor 82928 322702 3321 32767 3 0x4000090 kqsel syz-executor 82928 94019 3321 32767 3 0x4000090 fsleep syz-executor 40338 494583 0 0 3 0x14200 bored sosplice 23183 195989 80230 32767 3 0x90 piperd syz-executor 4920 276747 80694 0 3 0x100082 sbwait arp 80694 139647 44705 0 3 0x10008a sigsusp sh 27275 127865 34904 32767 2 0x490 syz-executor 44705 520915 74677 0 3 0x80 wait syz-executor 56638 426003 39873 32767 2 0x490 syz-executor 3321 101431 21333 32767 3 0x90 nanoslp syz-executor 80230 42304 41257 0 3 0x82 wait syz-executor 39873 151846 41257 0 3 0x82 wait syz-executor 21333 367708 41257 0 3 0x82 wait syz-executor 74677 416104 41257 0 3 0x82 wait syz-executor 21350 743 41257 0 3 0x82 wait syz-executor 34904 178576 41257 0 3 0x82 wait syz-executor 41257 520326 95908 0 3 0x82 nanoslp syz-executor 95908 142475 74526 0 3 0x10008a sigsusp ksh 74526 4048 75271 0 3 0x98 kqread sshd-session 75271 134164 31429 0 3 0x92 kqread sshd-session 19653 470727 1 0 3 0x100083 ttyin getty 31429 54632 1 0 3 0x88 kqread sshd 48394 373556 80805 73 3 0x1100090 kqread syslogd 80805 175372 1 0 3 0x100082 sbwait syslogd 63902 493179 1 0 3 0x100080 kqread resolvd 11782 146667 93417 77 3 0x100092 kqread dhcpleased 502 191666 93417 77 3 0x100092 kqread dhcpleased 93417 195985 1 0 3 0x80 kqread dhcpleased 18018 451242 0 0 3 0x14200 bored smr 92277 253026 0 0 2 0x14200 zerothread 55665 364925 0 0 3 0x14200 aiodoned aiodoned 26728 170727 0 0 3 0x14200 syncer update 11363 320984 0 0 3 0x14200 cleaner cleaner 24794 95337 0 0 7 0x14200 reaper 4150 111467 0 0 3 0x14200 pgdaemon pagedaemon 21182 74990 0 0 3 0x14200 bored viomb 36569 523325 0 0 3 0x40014200 acpi0 acpi0 64562 155788 0 0 3 0x40014200 idle1 23126 379081 0 0 3 0x14200 bored softnet3 53076 408346 0 0 3 0x14200 bored softnet2 72214 379654 0 0 3 0x14200 bored softnet1 17128 446136 0 0 3 0x14200 bored softnet0 80762 340980 0 0 3 0x14200 bored systqmp 21308 431237 0 0 3 0x14200 bored systq 86120 275655 0 0 3 0x14200 tmoslp softclockmp 90395 107739 0 0 3 0x40014200 tmoslp softclock 9210 219036 0 0 3 0x40014200 idle0 1 147969 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 (0xffffffff839bf418) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #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 #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:577 #7 Xsyscall+0x128 Process 90234 (syz-executor) thread 0xffff8000ffff6a60 (143682) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838e8818) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #1 syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff839bf418) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #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 #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:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10184 10950K 10966K 166960K 11269 0 pcb 17 12K 12K 166960K 17 0 rtable 176 5K 6K 166960K 331 0 pf 27 16K 16K 166960K 31 0 ifaddr 32 5K 7K 166960K 42 0 ifgroup 42 1K 2K 166960K 50 0 sysctl 1 1K 1K 166960K 1 0 counters 60 35K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 30 0 iov 0 0K 16K 166960K 17 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1333 84K 84K 166960K 1588 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 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 121K 166960K 369 0 sigio 0 0K 0K 166960K 132 0 proc 58 79K 103K 166960K 481 0 subproc 54 3K 4K 166960K 234 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 30 0 in_multi 67 5K 6K 166960K 91 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 411 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 187 56K 90K 166960K 4357 0 UVM aobj 13 4K 5K 166960K 14 0 pinsyscall 41 82K 112K 166960K 1362 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 9 0K 1K 166960K 25 0 temp 33 8639K 8704K 166960K 4696 0 kqueue 13 20K 24K 166960K 51 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 45 0 41 1 0 1 1 0 8 0 rtentry 112 105 0 24 3 0 3 3 0 8 0 unpcb 144 224 0 209 4 0 4 4 0 8 3 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 136 0 129 4 0 4 4 0 8 3 arp 120 17 0 4 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 2 0 0 1 0 1 1 0 8 0 inpcb 376 273 0 262 5 0 5 5 0 8 3 nd6 136 23 0 7 1 0 1 1 0 8 0 kcovpl 48 26 0 20 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 416 0 90 26 0 26 26 0 8 4 art_table 32 417 0 90 4 0 4 4 0 8 0 art_node 16 104 0 30 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 1 0 1 1 0 8 1 semapl 112 15 0 5 1 0 1 1 0 8 0 shmpl 112 11 0 1 1 0 1 1 0 8 0 pool(0xffffffff839bf400:shmpl): page inconsistency: page 0xfffffd806b010000; 24 on list, 10 missing, 35 items per page dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1866 0 340 96 0 96 96 0 8 0 ffsino 280 1866 0 340 110 0 110 110 0 8 0 nchpl 144 2264 0 570 63 0 63 63 0 8 0 uvmvnodes 80 2109 0 0 44 0 44 44 0 8 0 vnodes 216 2109 0 0 118 0 118 118 0 8 0 namei 1024 7645 0 7645 1 0 1 1 0 8 1 percpumem 16 46 0 2 1 0 1 1 0 8 0 kstatmem 264 22 0 4 2 0 2 2 0 8 0 scxspl 216 7382 0 7382 3 2 1 2 1 8 1 plimitpl 152 93 0 72 2 0 2 2 0 8 1 sigapl 424 606 0 555 7 0 7 7 0 8 0 futexpl 64 2341 0 2339 1 0 1 1 0 8 0 knotepl 120 295 0 0 9 0 9 9 0 8 0 kqueuepl 216 78 0 68 1 0 1 1 0 8 0 pipepl 328 173 0 145 3 0 3 3 0 8 0 fdescpl 504 587 0 556 7 1 6 6 0 8 0 filepl 152 3150 0 2968 14 0 14 14 0 8 5 lockfpl 104 198 0 196 1 0 1 1 0 8 0 lockfspl 48 31 0 29 1 0 1 1 0 8 0 sessionpl 144 41 0 27 1 0 1 1 0 8 0 pgrppl 48 72 0 50 1 0 1 1 0 8 0 ucredpl 104 480 0 464 1 0 1 1 0 8 0 zombiepl 144 557 0 555 1 0 1 1 0 8 0 processpl 1168 606 0 555 5 0 5 5 0 8 0 procpl 656 891 0 836 7 0 7 7 0 8 1 sockpl 688 545 0 515 10 0 10 10 0 8 7 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 221 0 0 14 0 14 14 0 8 0 bufpl 280 2706 0 124 185 0 185 185 0 8 0 anonpl 24 120024 0 117106 44 0 44 44 0 184 17 amapchunkpl 152 13957 0 13570 36 0 36 36 0 158 14 amappl16 200 2318 0 2304 12 2 10 10 0 8 8 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 99 0 88 1 0 1 1 0 8 0 amappl13 176 64 0 64 1 1 0 1 0 8 0 amappl12 168 1178 0 1147 2 0 2 2 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 29 0 29 1 1 0 1 0 8 0 amappl9 144 278 0 278 1 1 0 1 0 8 0 amappl8 136 42 0 41 1 0 1 1 0 8 0 amappl7 128 153 0 142 1 0 1 1 0 8 0 amappl6 120 175 0 170 1 0 1 1 0 8 0 amappl5 112 136 0 130 1 0 1 1 0 8 0 amappl4 104 293 0 276 1 0 1 1 0 8 0 amappl3 96 2359 0 2267 4 0 4 4 0 8 0 amappl2 88 612 0 556 2 0 2 2 0 8 0 amappl1 80 8451 0 7909 14 0 14 14 0 8 0 amappl 88 3988 0 3850 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 13 0 1 1 0 1 1 0 8 0 uaddrrnd 24 587 0 556 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 587 0 556 1 0 1 1 0 8 0 vmmpekpl 168 7015 0 6972 3 0 3 3 0 8 0 vmmpepl 168 42724 0 41025 96 0 96 96 0 357 11 vmsppl 456 586 0 556 7 1 6 6 0 8 0 rwobjpl 64 16795 0 13879 50 0 50 50 0 8 1 pdppl 4096 1182 0 1112 106 32 74 96 0 8 4 pvpl 32 12802 0 0 104 0 104 104 0 265 0 pmappl 248 586 0 556 4 1 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 288 0 35 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(ffffffff833a8b32) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff839bf400,1,ffff80002a898858) at pool_do_get+0x5da pool_get(ffffffff839bf400,1) at pool_get+0x149 shmget_allocate_segment(ffff8000ffff6a60,ffff80002a898ab0,d0,ffff80002a898a00) at shmget_allocate_segment+0x1a7 sys_shmget(ffff8000ffff6a60,ffff80002a898ab0,ffff80002a898a00) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80002a898ab0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a898ab0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x191da0363b0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029aabff0) 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(ffffffff838e8610) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838e8610) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff8000ffffcf68) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029aabff0) 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(ffffffff838e8610) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838e8610) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff8000ffffcf68) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: -5