panic: pool_p_free: shmpl free list modified: page 0xfffffd8073105000; item addr 0xfffffd8073105ef0; offset 0x30=0x69ec97aa Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 256436 96400 32767 0x10 0 0 syz-executor *146011 19103 0 0x14000 0x200 1 systqmp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344a196) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_p_free(ffffffff83997940,fffffd8073105f90) at pool_p_free+0x2d1 sys/kern/subr_pool.c:990 pool_gc_pages(0) at pool_gc_pages+0x357 sys/kern/subr_pool.c:1591 taskq_thread(ffffffff838b0710) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: 10 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_p_free: shmpl free list modified: page 0xfffffd8073105000; item addr 0xfffffd8073105ef0; offset 0x30=0x69ec97aa ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344a196) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_p_free(ffffffff83997940,fffffd8073105f90) at pool_p_free+0x2d1 sys/kern/subr_pool.c:990 pool_gc_pages(0) at pool_gc_pages+0x357 sys/kern/subr_pool.c:1591 taskq_thread(ffffffff838b0710) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -5 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a1eab90 rbx 0xffff8000299bee07 rdx 0 rcx 0xffff8000ffffe000 rax 0xffff8000299bdff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8d0501f32d1c9e8e r11 0x48211ed31c81a923 r12 0xffff8000299bec08 r13 0 r14 0 r15 0x1 rip 0xffffffff82b4a795 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a1eab80 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (systqmp) tid=146011 pid=19103 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffe298,0xffff8000ffffe7d8 process=0xffff8000ffff89a0 user=0xffff80002a1e5000, vmspace=0xffffffff83a45818 estcpu=0, cpticks=3, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43593 111791 87127 32767 2 0x10 syz-executor 43593 87423 87127 32767 3 0x4000090 fsleep syz-executor 43593 180057 87127 32767 3 0x4000090 fsleep syz-executor 71104 395968 15373 32767 2 0x81010 syz-executor 71104 438997 15373 32767 3 0x4003010 suspend syz-executor 76373 49883 30429 32767 2 0x81010 syz-executor 76373 514810 30429 32767 3 0x4003010 suspend syz-executor 96400 256436 75912 32767 7 0x10 syz-executor 32720 358541 53823 32767 2 0x3010 syz-executor 26603 438619 55528 32767 4 0x82010 syz-executor 26603 451046 55528 32767 2 0x4082010 syz-executor 26603 499728 55528 32767 3 0x4002010 suspend syz-executor 30429 229953 69186 32767 3 0x90 wait syz-executor 69186 112604 91545 0 3 0x82 wait syz-executor 42035 289708 21238 32767 3 0x10 biowait syz-executor 53823 6668 70635 32767 3 0x90 wait syz-executor 15373 360545 2815 32767 3 0x90 wait syz-executor 87127 67675 33990 32767 2 0xc90 syz-executor 44941 272661 66519 32767 3 0x90 piperd syz-executor 75912 184318 32917 32767 2 0x10 syz-executor 55528 302373 1 32767 3 0x90 wait syz-executor 70635 174524 91545 0 3 0x82 wait syz-executor 2815 188232 91545 0 3 0x82 wait syz-executor 21238 424343 91545 0 3 0x82 wait syz-executor 33990 427319 91545 0 3 0x82 wait syz-executor 66519 483083 91545 0 3 0x82 wait syz-executor 32917 75116 91545 0 3 0x82 wait syz-executor 91545 416633 71154 0 3 0x82 wait syz-executor 71154 43826 45069 0 3 0x10008a sigsusp ksh 45069 521748 44955 0 3 0x98 kqread sshd-session 44955 493326 97459 0 3 0x92 kqread sshd-session 24655 511970 1 0 3 0x100083 ttyin getty 97459 481956 1 0 3 0x88 kqread sshd 5573 348441 97153 73 3 0x1100090 kqread syslogd 97153 264245 1 0 3 0x100082 sbwait syslogd 11733 445088 1 0 3 0x100080 kqread resolvd 58120 167965 94379 77 3 0x100092 kqread dhcpleased 60075 406613 94379 77 3 0x100092 kqread dhcpleased 94379 400085 1 0 3 0x80 kqread dhcpleased 6329 420895 0 0 3 0x14200 bored smr 57965 250428 0 0 2 0x14200 zerothread 66128 239341 0 0 3 0x14200 aiodoned aiodoned 74436 444760 0 0 2 0x14e00 update 54774 45025 0 0 3 0x14200 cleaner cleaner 53382 120206 0 0 2 0x14200 reaper 7594 268561 0 0 3 0x14200 pgdaemon pagedaemon 68855 278097 0 0 3 0x14200 bored viomb 51395 476586 0 0 3 0x40014200 acpi0 acpi0 96548 193181 0 0 3 0x40014200 idle1 10885 369748 0 0 3 0x14200 bored softnet1 23444 358760 0 0 3 0x14200 bored softnet0 *19103 146011 0 0 7 0x14200 systqmp 53211 190122 0 0 3 0x14200 bored systq 21433 281149 0 0 3 0x14200 tmoslp softclockmp 97146 447358 0 0 3 0x40014200 tmoslp softclock 71170 288394 0 0 3 0x40014200 idle0 1 515851 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &pr->ps_mtx r = 0 (0xffff8000397c8138) #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+0x4b4 sys/kern/kern_lock.c:487 #2 exit1+0x202 sys/kern/kern_exit.c:162 #3 proc_suspend_check_locked+0x31d sys/kern/kern_sig.c:2235 #4 userret+0x8c proc_suspend_check sys/kern/kern_sig.c:-1 [inline] #4 userret+0x8c sys/kern/kern_sig.c:2194 #5 Xsyscall+0x156 Process 42035 (syz-executor) thread 0xffff8000fffe6550 (289708) exclusive rrwlock inode r = 0 (0xfffffd806a59a318) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x98a sys/kern/vfs_lookup.c:567 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cdfed68) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 19103 (systqmp) thread 0xffff8000ffffe000 (146011) shared rwlock pools r = 0 (0xffffffff83932498) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 pool_gc_pages+0x2e sys/kern/subr_pool.c:1568 #3 taskq_thread+0x157 sys/kern/kern_task.c:446 #4 proc_trampoline+0x10 shared rwlock systqmp r = 0 (0xffffffff838b0788) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11061 12019K 12034K 166960K 12155 0 pcb 17 12K 12K 166960K 17 0 rtable 241 6K 7K 166960K 414 0 pf 31 16K 16K 166960K 33 0 ifaddr 42 7K 7K 166960K 48 0 ifgroup 50 2K 2K 166960K 54 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 37 0 iov 0 0K 16K 166960K 84 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1296 82K 82K 166960K 1517 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 21 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 23 85K 117K 166960K 582 0 sigio 0 0K 0K 166960K 17 0 proc 58 99K 147K 166960K 566 0 subproc 72 4K 5K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 89 0 in_multi 99 7K 7K 166960K 131 0 ether_multi 1 0K 0K 166960K 6 0 mrt 2 0K 0K 166960K 19 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 439 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 243 192K 207K 166960K 7196 0 UVM aobj 73 3K 3K 166960K 79 0 pinsyscall 44 88K 108K 166960K 1762 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 17 0 NDP 11 0K 2K 166960K 30 0 temp 58 9083K 9148K 166960K 6090 0 kqueue 13 20K 29K 166960K 123 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 120 106 0 103 2 1 1 2 0 8 0 rtentry 176 130 0 18 6 0 6 6 0 8 0 unpcb 144 325 0 308 2 1 1 2 0 8 0 syncache 336 11 0 11 1 1 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 314 0 306 7 6 1 7 0 8 0 arp 136 21 0 2 1 0 1 1 0 8 0 ipq 40 7 0 2 1 0 1 1 0 8 0 ipqe 40 13 0 8 1 0 1 1 0 8 0 inpcb 328 611 0 598 7 5 2 7 0 8 0 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 152 34 0 9 2 0 2 2 0 8 0 kcovpl 48 13 0 5 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 542 0 86 32 0 32 32 0 8 0 art_table 40 543 0 86 6 0 6 6 0 8 0 art_node 32 130 0 28 1 0 1 1 0 8 0 sysvmsgpl 40 45 0 5 1 0 1 1 0 8 0 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 76 0 6 3 1 2 3 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2263 0 798 92 0 92 92 0 8 0 ffsino 296 2263 0 798 114 0 114 114 0 8 0 nchpl 144 3065 0 1375 64 1 63 64 0 8 0 vnodes 216 2389 0 0 133 0 133 133 0 8 0 namei 1024 10295 0 10295 1 0 1 1 0 8 1 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 27 0 2 2 0 2 2 0 8 0 scxspl 216 10421 0 10420 10 9 1 8 1 8 0 plimitpl 152 141 0 116 2 0 2 2 0 8 0 sigapl 424 880 0 828 7 0 7 7 0 8 0 knotepl 120 501 0 0 16 0 16 16 0 8 1 kqueuepl 224 296 0 287 5 4 1 5 0 8 0 pipepl 344 179 0 148 4 0 4 4 0 8 0 fdescpl 528 864 0 829 3 0 3 3 0 8 0 filepl 160 5282 0 5069 15 5 10 15 0 8 0 lockfpl 104 286 0 284 2 1 1 2 0 8 0 lockfspl 48 54 0 52 1 0 1 1 0 8 0 sessionpl 144 86 0 70 1 0 1 1 0 8 0 pgrppl 48 104 0 80 1 0 1 1 0 8 0 ucredpl 104 936 0 917 1 0 1 1 0 8 0 zombiepl 144 830 0 828 1 0 1 1 0 8 0 processpl 1232 880 0 828 5 0 5 5 0 8 0 procpl 664 1611 0 1552 7 0 7 7 0 8 0 sosppl 176 1 0 1 1 1 0 1 0 8 0 sockpl 752 1046 0 1013 11 6 5 11 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k128 9344 3 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 mcl2k2 2112 1 0 0 1 0 1 1 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 256 393 0 0 25 0 25 25 0 8 0 bufpl 280 3327 0 102 231 0 231 231 0 8 0 anonpl 32 7550 0 0 61 0 61 61 0 246 0 amapchunkpl 152 22356 0 21845 31 7 24 31 0 158 1 amappl16 200 2916 0 2889 15 8 7 15 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 422 0 421 1 0 1 1 0 8 0 amappl13 176 133 0 123 1 0 1 1 0 8 0 amappl12 168 1110 0 1076 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 59 0 49 1 0 1 1 0 8 0 amappl9 144 261 0 261 1 1 0 1 0 8 0 amappl8 136 122 0 121 1 0 1 1 0 8 0 amappl7 128 153 0 141 1 0 1 1 0 8 0 amappl6 120 179 0 176 1 0 1 1 0 8 0 amappl5 112 114 0 106 1 0 1 1 0 8 0 amappl4 104 298 0 283 1 0 1 1 0 8 0 amappl3 96 4349 0 4230 5 1 4 4 0 8 0 amappl2 88 633 0 579 2 0 2 2 0 8 0 amappl1 80 14186 0 13613 16 2 14 16 0 8 0 amappl 88 6341 0 6165 6 0 6 6 0 92 0 uvmvnodes 80 112 0 0 3 0 3 3 0 8 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 78 0 6 2 0 2 2 0 8 0 uaddrrnd 24 864 0 828 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 864 0 828 1 0 1 1 0 8 0 vmmpekpl 168 9631 0 9587 3 0 3 3 0 8 0 vmmpepl 168 67002 0 65006 106 10 96 106 0 357 1 vmsppl 488 863 0 828 7 1 6 6 0 8 0 rwobjpl 80 22350 0 21314 27 1 26 27 0 8 0 pdppl 4096 1735 0 1656 121 36 85 93 0 8 6 pvpl 32 14835 0 0 120 0 120 120 0 265 0 pmappl 256 863 0 828 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 310 0 46 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83959ff0) 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(ffffffff83a6e080) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a6e080) at __mp_lock+0x192 sys/kern/kern_lock.c:173 postsig(ffff8000ffffcd00,9,ffff80003c448e38) at postsig+0x677 sys/kern/kern_sig.c:1769 userret(ffff8000ffffcd00) at userret+0x23e sys/kern/kern_sig.c:2207 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x775ba26ffb40, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83959ff0) 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(ffffffff83a6e080) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a6e080) at __mp_lock+0x192 sys/kern/kern_lock.c:173 postsig(ffff8000ffffcd00,9,ffff80003c448e38) at postsig+0x677 sys/kern/kern_sig.c:1769 userret(ffff8000ffffcd00) at userret+0x23e sys/kern/kern_sig.c:2207 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x775ba26ffb40, 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(ffffffff8344a196) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_p_free(ffffffff83997940,fffffd8073105f90) at pool_p_free+0x2d1 sys/kern/subr_pool.c:990 pool_gc_pages(0) at pool_gc_pages+0x357 sys/kern/subr_pool.c:1591 taskq_thread(ffffffff838b0710) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: 10 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344a196) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_p_free(ffffffff83997940,fffffd8073105f90) at pool_p_free+0x2d1 sys/kern/subr_pool.c:990 pool_gc_pages(0) at pool_gc_pages+0x357 sys/kern/subr_pool.c:1591 taskq_thread(ffffffff838b0710) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -5