panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d5d9400+16 0x0!=0xf0af241b38efbec4 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 65343 56831 0 0 0 0K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fdf6d) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff8291f248,2) 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(ffff800000aa1b00,800100,ffff800000aa1b40,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000aa1b00,ffff800000ac5000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff800000ac5000,ffff800020ec6eb0,0) at in6_update_ifa+0x13e7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020ec6eb0,ffff800000ac5000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806f685c80,8080691a,ffff800020ec6eb0,ffff800020ddcc38) at ifioctl+0xe70 sys/net/if.c:2282 soo_ioctl(fffffd806cf79c88,8080691a,ffff800020ec6eb0,ffff800020ddcc38) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020ddcc38,ffff800020ec6fc8,ffff800020ec7010) at sys_ioctl+0x4a5 syscall(ffff800020ec7090) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ec7090) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd6d30, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d5d9400+16 0x0!=0xf0af241b38efbec4 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fdf6d) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff8291f248,2) 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(ffff800000aa1b00,800100,ffff800000aa1b40,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000aa1b00,ffff800000ac5000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff800000ac5000,ffff800020ec6eb0,0) at in6_update_ifa+0x13e7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020ec6eb0,ffff800000ac5000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806f685c80,8080691a,ffff800020ec6eb0,ffff800020ddcc38) at ifioctl+0xe70 sys/net/if.c:2282 soo_ioctl(fffffd806cf79c88,8080691a,ffff800020ec6eb0,ffff800020ddcc38) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020ddcc38,ffff800020ec6fc8,ffff800020ec7010) at sys_ioctl+0x4a5 syscall(ffff800020ec7090) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ec7090) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd6d30, count: -14 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020ec6720 rbx 0xffff800020ec67d0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff817e707f kprintf+0x16f r9 0x1 r10 0x2 r11 0xdd523f2d965ceab5 r12 0x3000000008 r13 0xffff800020ec6730 r14 0x100 r15 0x1 rip 0xffffffff81354558 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020ec6710 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=65343 stat=onproc flags process=0 proc=0 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020dddad8,0xffffffff8291a7b0 process=0xffff800020df1af8 user=0xffff800020ec2000, vmspace=0xfffffd807f000170 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *56831 65343 14180 0 7 0 syz-executor.0 14180 178443 12433 0 3 0x82 nanosleep syz-executor.0 12433 24153 40301 0 3 0x82 thrsleep syz-execprog 12433 173517 40301 0 3 0x4000082 nanosleep syz-execprog 12433 474537 40301 0 3 0x4000082 thrsleep syz-execprog 12433 175947 40301 0 3 0x4000082 thrsleep syz-execprog 12433 512921 40301 0 3 0x4000082 nanosleep syz-execprog 12433 329410 40301 0 3 0x4000082 thrsleep syz-execprog 12433 291206 40301 0 3 0x4000082 thrsleep syz-execprog 12433 382427 40301 0 3 0x4000082 thrsleep syz-execprog 12433 111901 40301 0 3 0x4000082 kqread syz-execprog 40301 15747 99023 0 3 0x10008a pause ksh 99023 307726 39922 0 3 0x92 select sshd 40412 496712 1 0 3 0x100083 ttyin getty 39922 406223 1 0 3 0x80 select sshd 33316 508741 9227 74 3 0x100092 bpf pflogd 9227 473529 1 0 3 0x80 netio pflogd 79184 514036 62633 73 3 0x100090 kqread syslogd 62633 148394 1 0 3 0x100082 netio syslogd 33895 469335 1 77 3 0x100090 poll dhclient 23670 280561 1 0 3 0x80 poll dhclient 30338 17059 0 0 3 0x14200 bored smr 54301 65125 0 0 3 0x14200 pgzero zerothread 23391 474281 0 0 3 0x14200 aiodoned aiodoned 41777 324447 0 0 3 0x14200 syncer update 96040 480580 0 0 3 0x14200 cleaner cleaner 8609 330203 0 0 3 0x14200 reaper reaper 8326 29798 0 0 3 0x14200 pgdaemon pagedaemon 44350 262753 0 0 3 0x14200 bored crynlk 95553 231720 0 0 3 0x14200 bored crypto 90857 5036 0 0 3 0x40014200 acpi0 acpi0 31901 224320 0 0 7 0x40014200 idle1 45582 84677 0 0 3 0x14200 bored softnet 91513 223235 0 0 3 0x14200 bored systqmp 22893 279376 0 0 3 0x14200 bored systq 10689 96550 0 0 3 0x40014200 bored softclock 6511 519987 0 0 3 0x40014200 idle0 1 20983 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 56831 (syz-executor.0) thread 0xffff800020ddcc38 (65343) exclusive rwlock netlock r = 0 (0xffffffff826fbc18) #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:2282 #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 (0xffffffff828cb930) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9467 6396K 6396K 78643K 10560 0 pcb 13 8K 8K 78643K 13 0 rtable 83 2K 2K 78643K 163 0 ifaddr 38 9K 9K 78643K 222 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 1824 197K 290K 78643K 13058 0 file desc 3 8K 12K 78643K 201 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 1133 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 5 0K 0K 78643K 7 0 temp 29 3849K 3913K 78643K 2235 0 kqueue 3 4K 4K 78643K 3 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> 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 1 0 1 0 8 0 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 296 217 0 210 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 11 0 0 1 0 1 1 0 8 0 pfstkey 112 11 0 0 1 0 1 1 0 8 0 pfstate 328 11 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 256 143 0 0 9 0 9 9 0 8 0 art_table 32 144 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 1607 0 205 88 0 88 88 0 8 0 ffsino 272 1607 0 205 94 0 94 94 0 8 0 nchpl 144 2009 0 405 60 0 60 60 0 8 0 uvmvnodes 72 1617 0 0 30 0 30 30 0 8 0 vnodes 208 1617 0 0 86 0 86 86 0 8 0 namei 1024 4962 0 4962 1 0 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 5701 0 5701 8 1 7 7 0 8 7 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 424 0 394 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 496 409 0 394 3 0 3 3 0 8 0 filepl 152 1482 0 1423 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 144 394 0 394 1 0 1 1 0 8 1 processpl 984 424 0 394 5 0 5 5 0 8 1 procpl 624 432 0 394 4 0 4 4 0 8 1 sockpl 400 263 0 244 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 79 0 0 10 0 10 10 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 113 0 0 7 0 7 7 0 8 0 mbufpl: pool(0xffffffff8291f248:mbufpl): free list modified: page 0xfffffd806d5d9000; item ordinal 5; addr 0xfffffd806d5d9c00 (p 0xfffffd806ddec000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806d5d9000; item ordinal 5; addr 0xfffffd806d5d9c00 (p 0xfffffd806ddec000); offset 0x0=0x0 mbufpl: pool(0xffffffff8291f248:mbufpl): page inconsistency: page 0xfffffd806d5d9000; item ordinal 6; addr 0x8f82eb14ff0c95e5 mbufpl: pool(0xffffffff8291f248:mbufpl): free list modified: page 0xfffffd806d6b0000; item ordinal 3; addr 0xfffffd806d6b0c00 (p 0xfffffd806ddec000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806d6b0000; item ordinal 3; addr 0xfffffd806d6b0c00 (p 0xfffffd806ddec000); offset 0x0=0x0 mbufpl: pool(0xffffffff8291f248:mbufpl): page inconsistency: page 0xfffffd806d6b0000; item ordinal 4; addr 0xa39c7bd583b6e5cb bufpl 280 3231 0 132 222 0 222 222 0 8 0 anonpl 16 26917 0 25139 13 1 12 12 0 124 4 amapchunkpl 152 1035 0 968 5 0 5 5 0 158 1 amappl16 192 878 0 834 3 0 3 3 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 29 0 24 1 0 1 1 0 8 0 amappl13 168 22 0 20 1 0 1 1 0 8 0 amappl12 160 19 0 17 2 1 1 1 0 8 0 amappl11 152 239 0 222 1 0 1 1 0 8 0 amappl10 144 14 0 12 1 0 1 1 0 8 0 amappl9 136 233 0 232 1 0 1 1 0 8 0 amappl8 128 270 0 262 1 0 1 1 0 8 0 amappl7 120 114 0 103 1 0 1 1 0 8 0 amappl6 112 206 0 203 2 1 1 1 0 8 0 amappl5 104 305 0 289 1 0 1 1 0 8 0 amappl4 96 496 0 469 1 0 1 1 0 8 0 amappl3 88 107 0 101 1 0 1 1 0 8 0 amappl2 80 1247 0 1184 2 0 2 2 0 8 0 amappl1 72 16914 0 16485 23 5 18 18 0 8 8 amappl 80 659 0 630 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 24 409 0 394 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 409 0 394 1 0 1 1 0 8 0 vmmpekpl 168 6745 0 6720 2 0 2 2 0 8 0 vmmpepl 168 40378 0 39400 80 8 72 72 0 357 29 vmsppl 368 408 0 394 2 0 2 2 0 8 0 pdppl 4096 825 0 788 6 0 6 6 0 8 1 pvpl 32 133473 0 129258 104 0 104 104 0 265 69 pmappl 232 408 0 394 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 233 0 3 7 0 7 7 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fdf6d) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff8291f248,2) 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(ffff800000aa1b00,800100,ffff800000aa1b40,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000aa1b00,ffff800000ac5000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff800000ac5000,ffff800020ec6eb0,0) at in6_update_ifa+0x13e7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020ec6eb0,ffff800000ac5000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806f685c80,8080691a,ffff800020ec6eb0,ffff800020ddcc38) at ifioctl+0xe70 sys/net/if.c:2282 soo_ioctl(fffffd806cf79c88,8080691a,ffff800020ec6eb0,ffff800020ddcc38) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020ddcc38,ffff800020ec6fc8,ffff800020ec7010) at sys_ioctl+0x4a5 syscall(ffff800020ec7090) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ec7090) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd6d30, count: -14 ddb{0}>