login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f308800+16 0x0!=0xb720f97935595239 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 266899 82844 0 0x2 0x4000480 1 syz-execprog *370340 87699 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fee48) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828b7640) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828b7640) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828b7640,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copyback(fffffd806f308600,80,20,ffff800000ac5dc0,2) at m_copyback+0x4d7 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copyback(fffffd806f308600,80,20,ffff800000ac5dc0,2) at m_copyback+0x4d7 sys/kern/uipc_mbuf.c:790 rtm_msg1(14,ffff800020d972d8) at rtm_msg1+0x1b2 sys/net/rtsock.c:1552 rtm_addr(14,ffff800000aa2e00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000aa2e00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000af2130) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000af2130) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d88c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: 5 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 0xfffffd806f308800+16 0x0!=0xb720f97935595239 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fee48) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828b7640) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828b7640) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828b7640,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copyback(fffffd806f308600,80,20,ffff800000ac5dc0,2) at m_copyback+0x4d7 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copyback(fffffd806f308600,80,20,ffff800000ac5dc0,2) at m_copyback+0x4d7 sys/kern/uipc_mbuf.c:790 rtm_msg1(14,ffff800020d972d8) at rtm_msg1+0x1b2 sys/net/rtsock.c:1552 rtm_addr(14,ffff800000aa2e00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000aa2e00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000af2130) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000af2130) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d88c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -10 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020d96fb0 rbx 0xffff800020d97060 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81cf234f kprintf+0x16f r9 0x1 r10 0x2 r11 0xd94fef7912ec3cdc r12 0x3000000008 r13 0xffff800020d96fc0 r14 0x100 r15 0x1 rip 0xffffffff81df9468 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020d96fa0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=370340 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020d895f0,0xffff800020d889d0 process=0xffff800020d8a3e0 user=0xffff800020d92000, vmspace=0xffffffff828dbec0 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38162 127823 82844 0 2 0x482 syz-executor.0 82844 132970 34220 0 3 0x82 thrsleep syz-execprog 82844 296766 34220 0 2 0x4000482 syz-execprog 82844 204786 34220 0 3 0x4000082 thrsleep syz-execprog 82844 128418 34220 0 3 0x4000082 kqread syz-execprog 82844 10141 34220 0 3 0x4000082 thrsleep syz-execprog 82844 7174 34220 0 3 0x4000082 thrsleep syz-execprog 82844 288667 34220 0 3 0x4000082 thrsleep syz-execprog 82844 266899 34220 0 7 0x4000482 syz-execprog 82844 77776 34220 0 3 0x4000082 thrsleep syz-execprog 34220 382925 87990 0 3 0x10008a pause ksh 87990 271346 21211 0 3 0x92 select sshd 50654 62874 1 0 3 0x100083 ttyin getty 21211 396441 1 0 3 0x80 select sshd 4487 451340 25903 74 3 0x100092 bpf pflogd 25903 323370 1 0 3 0x80 netio pflogd 93070 329733 98387 73 3 0x100090 kqread syslogd 98387 284376 1 0 3 0x100082 netio syslogd 14312 341422 1 77 3 0x100090 poll dhclient 790 433325 1 0 3 0x80 poll dhclient 78358 389053 0 0 3 0x14200 bored smr 80272 149638 0 0 3 0x14200 pgzero zerothread 66598 257194 0 0 3 0x14200 aiodoned aiodoned 81001 18308 0 0 3 0x14200 syncer update 88750 269607 0 0 3 0x14200 cleaner cleaner 4872 16902 0 0 3 0x14200 reaper reaper 60200 492593 0 0 3 0x14200 pgdaemon pagedaemon 17066 160793 0 0 3 0x14200 bored crynlk 27691 87289 0 0 3 0x14200 bored crypto 89349 473954 0 0 3 0x40014200 acpi0 acpi0 61485 455430 0 0 3 0x40014200 idle1 42969 474945 0 0 3 0x14200 bored softnet 26735 332620 0 0 3 0x14200 bored systqmp 6934 380464 0 0 3 0x14200 bored systq *87699 370340 0 0 7 0x40014200 softclock 11372 337162 0 0 3 0x40014200 idle0 1 455367 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 87699 (softclock) thread 0xffff800020d88c30 (370340) exclusive rwlock netlock r = 0 (0xffffffff82773eb8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 nd6_dad_timer+0x34 sys/netinet6/nd6_nbr.c:1170 #2 timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] #2 timeout_run+0xc4 sys/kern/kern_timeout.c:490 #3 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #4 proc_trampoline+0x1c shared rwlock timeout r = 0 (0xffffffff826f68c8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 timeout_run+0xb9 sys/kern/kern_timeout.c:489 #2 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #3 proc_trampoline+0x1c exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829156c0) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:435 #3 sleep_finish+0x113 sys/kern/kern_synch.c:418 #4 softclock_thread+0x103 sys/kern/kern_timeout.c:575 #5 proc_trampoline+0x1c 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 37 9K 9K 78643K 81 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 2 4K 12K 78643K 60 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 74 12K 12K 78643K 990 0 UVM aobj 3 2K 2K 78643K 3 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 3853K 3917K 78643K 1954 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 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 296 76 0 70 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 2 1 0 1 1 0 8 0 pfstkey 112 11 0 2 1 0 1 1 0 8 0 pfstate 328 11 0 2 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 256 145 0 0 10 0 10 10 0 8 0 art_table 32 146 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 1466 0 64 88 0 88 88 0 8 0 ffsino 272 1466 0 64 94 0 94 94 0 8 0 nchpl 144 1727 0 123 60 0 60 60 0 8 0 uvmvnodes 72 1476 0 0 27 0 27 27 0 8 0 vnodes 208 1476 0 0 78 0 78 78 0 8 0 namei 1024 4398 0 4398 2 1 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4852 0 4852 9 8 1 7 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 283 0 254 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 pipepl 304 77 0 70 2 1 1 1 0 8 0 fdescpl 496 268 0 254 3 0 3 3 0 8 0 filepl 152 1200 0 1142 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 144 254 0 253 2 1 1 1 0 8 0 processpl 992 283 0 253 5 0 5 5 0 8 1 procpl 624 291 0 253 3 0 3 3 0 8 0 sockpl 400 122 0 104 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 74 0 0 10 0 10 10 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 114 0 0 6 0 6 6 0 8 0 mbufpl: pool(0xffffffff828b7640:mbufpl): free list modified: page 0xfffffd806f2d2000; item ordinal 1; addr 0xfffffd806f2d2c00 (p 0xfffffd806f2d3000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806f2d2000; item ordinal 1; addr 0xfffffd806f2d2c00 (p 0xfffffd806f2d3000); offset 0x0=0x0 mbufpl: pool(0xffffffff828b7640:mbufpl): page inconsistency: page 0xfffffd806f2d2000; item ordinal 2; addr 0xa3303b1fb5bf18a9 bufpl 280 3091 0 133 212 0 212 212 0 8 0 anonpl 16 23484 0 21822 14 2 12 12 0 124 4 amapchunkpl 152 847 0 781 5 0 5 5 0 158 1 amappl16 192 357 0 322 3 0 3 3 0 8 1 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 30 0 25 1 0 1 1 0 8 0 amappl13 168 22 0 20 2 1 1 1 0 8 0 amappl12 160 5 0 3 2 1 1 1 0 8 0 amappl11 152 53 0 38 1 0 1 1 0 8 0 amappl10 144 20 0 16 1 0 1 1 0 8 0 amappl9 136 231 0 230 1 0 1 1 0 8 0 amappl8 128 276 0 267 1 0 1 1 0 8 0 amappl7 120 125 0 112 1 0 1 1 0 8 0 amappl6 112 20 0 19 2 1 1 1 0 8 0 amappl5 104 172 0 157 1 0 1 1 0 8 0 amappl4 96 494 0 468 1 0 1 1 0 8 0 amappl3 88 105 0 100 1 0 1 1 0 8 0 amappl2 80 998 0 938 3 1 2 2 0 8 0 amappl1 72 16084 0 15664 23 5 18 18 0 8 8 amappl 80 516 0 488 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 268 0 254 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 268 0 254 1 0 1 1 0 8 0 vmmpekpl 168 6482 0 6454 2 0 2 2 0 8 0 vmmpepl 168 35059 0 34117 82 9 73 73 0 357 28 vmsppl 368 267 0 254 2 0 2 2 0 8 0 pdppl 4096 543 0 508 6 0 6 6 0 8 1 pvpl 32 118596 0 114556 110 6 104 104 0 265 70 pmappl 232 267 0 254 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 233 0 4 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(ffffffff823fee48) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828b7640) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828b7640) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828b7640,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copyback(fffffd806f308600,80,20,ffff800000ac5dc0,2) at m_copyback+0x4d7 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copyback(fffffd806f308600,80,20,ffff800000ac5dc0,2) at m_copyback+0x4d7 sys/kern/uipc_mbuf.c:790 rtm_msg1(14,ffff800020d972d8) at rtm_msg1+0x1b2 sys/net/rtsock.c:1552 rtm_addr(14,ffff800000aa2e00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000aa2e00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000af2130) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000af2130) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d88c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d70ff0) 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(ffffffff829154b8) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829154b8) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff829154b8,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020eb09c0,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020eb09c0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020eb09c0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(ffffffff827b0188,120,ffffffff823ed3d3,2) at tsleep+0x1cc sys/kern/kern_synch.c:155 sys_nanosleep(ffff800020ddc758,ffff800020eb0af0,ffff800020eb0b40) at sys_nanosleep+0x205 sys/kern/kern_time.c:297 syscall(ffff800020eb0bc0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020eb0bc0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000159e40, count: 3 ddb{1}> trace x86_ipi_db(ffff800020d70ff0) 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(ffffffff829154b8) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829154b8) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff829154b8,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020eb09c0,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020eb09c0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020eb09c0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(ffffffff827b0188,120,ffffffff823ed3d3,2) at tsleep+0x1cc sys/kern/kern_synch.c:155 sys_nanosleep(ffff800020ddc758,ffff800020eb0af0,ffff800020eb0b40) at sys_nanosleep+0x205 sys/kern/kern_time.c:297 syscall(ffff800020eb0bc0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020eb0bc0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000159e40, count: -12 ddb{1}>