panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd807f01f400+16 0x0!=0x56f0d7f9bf0c1eeb Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 3066 51841 0 0 0 1K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f6e76) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82684288) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82684288) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82684288,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 rt_ifa_del(ffff800000a0d700,800100,ffff800000a0d740,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000a0d700,ffff8000009d6000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff8000009d6000,ffff800020f5f1d0,0) at in6_update_ifa+0x13f7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020f5f1d0,ffff8000009d6000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806f6df960,8080691a,ffff800020f5f1d0,ffff800020e6dd48) at ifioctl+0xe70 sys/net/if.c:2289 soo_ioctl(fffffd806d0c8860,8080691a,ffff800020f5f1d0,ffff800020e6dd48) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020e6dd48,ffff800020f5f2e8,ffff800020f5f330) at sys_ioctl+0x4a5 syscall(ffff800020f5f3b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020f5f3b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffed140, count: 1 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 pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd807f01f400+16 0x0!=0x56f0d7f9bf0c1eeb ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f6e76) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82684288) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82684288) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82684288,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 rt_ifa_del(ffff800000a0d700,800100,ffff800000a0d740,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000a0d700,ffff8000009d6000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff8000009d6000,ffff800020f5f1d0,0) at in6_update_ifa+0x13f7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020f5f1d0,ffff8000009d6000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806f6df960,8080691a,ffff800020f5f1d0,ffff800020e6dd48) at ifioctl+0xe70 sys/net/if.c:2289 soo_ioctl(fffffd806d0c8860,8080691a,ffff800020f5f1d0,ffff800020e6dd48) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020e6dd48,ffff800020f5f2e8,ffff800020f5f330) at sys_ioctl+0x4a5 syscall(ffff800020f5f3b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020f5f3b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffed140, count: -14 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020f5ea40 rbx 0xffff800020f5eaf0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff818760ff kprintf+0x16f r9 0x1 r10 0xa939cea7ef8b12a9 r11 0x75a5e38a06d228da r12 0x3000000008 r13 0xffff800020f5ea50 r14 0x100 r15 0x1 rip 0xffffffff81b84248 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020f5ea30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=3066 stat=onproc flags process=0 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020e6c4e8,0xffffffff826798e0 process=0xffff800020e81720 user=0xffff800020f5a000, vmspace=0xfffffd807f000a10 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *51841 3066 53557 0 7 0 syz-executor.0 53557 221550 7805 0 3 0x82 nanosleep syz-executor.0 7805 23269 879 0 3 0x82 thrsleep syz-execprog 7805 500988 879 0 3 0x4000082 nanosleep syz-execprog 7805 77731 879 0 3 0x4000082 thrsleep syz-execprog 7805 242434 879 0 3 0x4000082 thrsleep syz-execprog 7805 144456 879 0 3 0x4000082 thrsleep syz-execprog 7805 462818 879 0 3 0x4000082 thrsleep syz-execprog 7805 398730 879 0 3 0x4000082 nanosleep syz-execprog 7805 361704 879 0 3 0x4000082 thrsleep syz-execprog 7805 218724 879 0 3 0x4000082 kqread syz-execprog 879 359382 14023 0 3 0x10008a pause ksh 14023 108347 34678 0 3 0x92 select sshd 86893 131655 1 0 3 0x100083 ttyin getty 34678 61587 1 0 3 0x80 select sshd 78031 378372 65580 74 3 0x100092 bpf pflogd 65580 352490 1 0 3 0x80 netio pflogd 76963 189851 98175 73 3 0x100090 kqread syslogd 98175 238044 1 0 3 0x100082 netio syslogd 40284 361152 1 77 3 0x100090 poll dhclient 73486 163834 1 0 3 0x80 poll dhclient 94231 509749 0 0 3 0x14200 bored smr 7038 447761 0 0 3 0x14200 pgzero zerothread 74937 334905 0 0 3 0x14200 aiodoned aiodoned 18741 289402 0 0 3 0x14200 syncer update 77255 412550 0 0 3 0x14200 cleaner cleaner 38385 109269 0 0 3 0x14200 reaper reaper 12922 489323 0 0 3 0x14200 pgdaemon pagedaemon 93258 515732 0 0 3 0x14200 bored crynlk 40930 321166 0 0 3 0x14200 bored crypto 89521 202599 0 0 3 0x40014200 acpi0 acpi0 27512 79094 0 0 3 0x40014200 idle1 26514 339902 0 0 3 0x14200 bored softnet 40198 482819 0 0 3 0x14200 bored systqmp 85194 371002 0 0 3 0x14200 bored systq 90471 36401 0 0 3 0x40014200 bored softclock 2524 495734 0 0 7 0x40014200 idle0 1 170261 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 51841 (syz-executor.0) thread 0xffff800020e6dd48 (3066) exclusive rwlock netlock r = 0 (0xffffffff825147c8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 in6_ioctl_change_ifaddr+0x155 sys/netinet6/in6.c:295 #2 ifioctl+0xe70 sys/net/if.c:2289 #3 soo_ioctl+0x27c sys/kern/sys_socket.c:138 #4 sys_ioctl+0x4a5 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8268ffa8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 soo_ioctl+0x26a sys/kern/sys_socket.c:138 #2 sys_ioctl+0x4a5 #3 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #4 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9466 6395K 6395K 78643K 10557 0 pcb 13 8K 8K 78643K 13 0 rtable 83 2K 2K 78643K 163 0 ifaddr 38 9K 9K 78643K 40 0 counters 41 33K 33K 78643K 41 0 ioctlops 0 0K 4K 78643K 1468 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1823 197K 290K 78643K 12980 0 file desc 3 8K 12K 78643K 19 0 proc 59 63K 83K 78643K 398 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 22 1K 1K 78643K 22 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 197 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 75 12K 12K 78643K 954 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 7 0K 0K 78643K 7 0 temp 29 3033K 3097K 78643K 1869 0 kqueue 3 4K 4K 78643K 3 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 17 0 15 1 0 1 1 0 8 0 rtentry 112 34 0 1 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 35 0 28 1 0 1 1 0 8 0 nd6 48 3 0 0 1 0 1 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 10 0 0 1 0 1 1 0 8 0 pfstkey 112 10 0 0 1 0 1 1 0 8 0 pfstate 328 10 0 0 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 144 0 0 9 0 9 9 0 8 0 art_table 32 145 0 0 2 0 2 2 0 8 0 art_node 16 33 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1425 0 23 88 0 88 88 0 8 0 ffsino 272 1425 0 23 94 0 94 94 0 8 0 nchpl 144 1642 0 41 60 0 60 60 0 8 0 uvmvnodes 72 1435 0 0 27 0 27 27 0 8 0 vnodes 208 1435 0 0 76 0 76 76 0 8 0 namei 1024 4210 0 4210 1 0 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 3818 0 3818 2 1 1 2 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 242 0 212 4 0 4 4 0 8 0 knotepl 112 47 0 36 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 48 77 0 70 1 0 1 1 0 8 0 pipepl 120 154 0 141 1 0 1 1 0 8 0 fdescpl 496 227 0 212 3 0 3 3 0 8 0 filepl 152 1113 0 1054 3 0 3 3 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 112 19 0 9 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 62 0 53 1 0 1 1 0 8 0 zombiepl 144 212 0 212 1 0 1 1 0 8 1 processpl 984 242 0 212 5 0 5 5 0 8 1 procpl 624 250 0 212 4 0 4 4 0 8 1 sockpl 400 81 0 62 2 0 2 2 0 8 0 mcl4k 4096 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 72 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 88 0 0 6 0 6 6 0 8 0 bufpl 280 2982 0 133 204 0 204 204 0 8 0 anonpl 16 22154 0 20494 13 1 12 12 0 124 4 amapchunkpl 152 867 0 801 4 0 4 4 0 158 1 amappl16 192 150 0 117 2 0 2 2 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 38 0 30 1 0 1 1 0 8 0 amappl13 168 24 0 21 1 0 1 1 0 8 0 amappl12 160 8 0 7 2 1 1 1 0 8 0 amappl11 152 48 0 33 1 0 1 1 0 8 0 amappl10 144 19 0 15 1 0 1 1 0 8 0 amappl9 136 231 0 229 1 0 1 1 0 8 0 amappl8 128 272 0 264 1 0 1 1 0 8 0 amappl7 120 114 0 103 1 0 1 1 0 8 0 amappl6 112 24 0 21 1 0 1 1 0 8 0 amappl5 104 128 0 114 1 0 1 1 0 8 0 amappl4 96 497 0 469 1 0 1 1 0 8 0 amappl3 88 108 0 101 1 0 1 1 0 8 0 amappl2 80 918 0 858 2 0 2 2 0 8 0 amappl1 72 15235 0 14805 24 6 18 18 0 8 8 amappl 80 479 0 450 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 227 0 212 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 227 0 212 1 0 1 1 0 8 0 vmmpekpl 168 6335 0 6312 2 0 2 2 0 8 0 vmmpepl 168 32462 0 31499 84 12 72 72 0 357 30 vmsppl 368 226 0 212 2 0 2 2 0 8 0 pdppl 4096 462 0 424 6 0 6 6 0 8 0 pvpl 32 113474 0 109398 104 0 104 104 0 265 70 pmappl 232 226 0 212 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 231 0 3 7 0 7 7 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82508ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff8268fda0) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8268fda0) at __mp_lock+0x127 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:89 Xsoftclock() at Xsoftclock+0x1f acpicpu_idle() at acpicpu_idle+0x331 sys/dev/acpi/acpicpu.c:1187 sched_idle(ffffffff82508ff0) at sched_idle+0x3f7 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff82508ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff8268fda0) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8268fda0) at __mp_lock+0x127 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:89 Xsoftclock() at Xsoftclock+0x1f acpicpu_idle() at acpicpu_idle+0x331 sys/dev/acpi/acpicpu.c:1187 sched_idle(ffffffff82508ff0) at sched_idle+0x3f7 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f6e76) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82684288) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82684288) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82684288,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 rt_ifa_del(ffff800000a0d700,800100,ffff800000a0d740,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000a0d700,ffff8000009d6000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff8000009d6000,ffff800020f5f1d0,0) at in6_update_ifa+0x13f7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020f5f1d0,ffff8000009d6000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806f6df960,8080691a,ffff800020f5f1d0,ffff800020e6dd48) at ifioctl+0xe70 sys/net/if.c:2289 soo_ioctl(fffffd806d0c8860,8080691a,ffff800020f5f1d0,ffff800020e6dd48) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020e6dd48,ffff800020f5f2e8,ffff800020f5f330) at sys_ioctl+0x4a5 syscall(ffff800020f5f3b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020f5f3b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffed140, count: 1 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f6e76) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82684288) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82684288) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82684288,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 rt_ifa_del(ffff800000a0d700,800100,ffff800000a0d740,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000a0d700,ffff8000009d6000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff8000009d6000,ffff800020f5f1d0,0) at in6_update_ifa+0x13f7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020f5f1d0,ffff8000009d6000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806f6df960,8080691a,ffff800020f5f1d0,ffff800020e6dd48) at ifioctl+0xe70 sys/net/if.c:2289 soo_ioctl(fffffd806d0c8860,8080691a,ffff800020f5f1d0,ffff800020e6dd48) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020e6dd48,ffff800020f5f2e8,ffff800020f5f330) at sys_ioctl+0x4a5 syscall(ffff800020f5f3b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020f5f3b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffed140, count: -14 ddb{1}>