panic:WA RpNoIoNlG_:ca ScPheL_ NitOTe m_LOmWaEgRiEcD_ cOhNe cSkY:S mCAbuLfL pl2 -c1pu8 43f9r5ee68 5l2i sEtX ImTo d0i fai e d:Stopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *115844 47006 0 0x2 0 0 syz-executor.0 342029 14255 0 0x14000 0x200 1 softnet savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc1890, count: 14 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 0xfffffd806d808400+16 0x0!=0xd4ee3057f6d04cad ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc1890, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800020f57120 rbx 0 rdx 0x8b rcx 0x2 rax 0x3b r8 0xffffffff818e80df kprintf+0x16f r9 0x1 r10 0x2 r11 0xae02a5c2c5db4ea2 r12 0 r13 0 r14 0xffff800020ec7d58 r15 0 rip 0xffffffff81a603f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800020f570a0 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.0) pid=115844 stat=onproc flags process=2 proc=0 pri=16, usrpri=60, nice=20 forw=0xffffffffffffffff, list=0xffff800020ec6c48,0xffff800020ec6508 process=0xffff800020e803e8 user=0xffff800020f52000, vmspace=0xfffffd807f0008a0 estcpu=36, cpticks=1, pctcpu=0.1 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48517 295268 47006 0 2 0 syz-executor.0 40087 370601 51015 0 2 0 syz-executor.1 *47006 115844 60651 0 7 0x2 syz-executor.0 53428 418312 0 0 3 0x14200 bored sosplice 51015 453290 60651 0 3 0x82 nanosleep syz-executor.1 60651 44461 55717 0 3 0x82 thrsleep syz-fuzzer 60651 72712 55717 0 2 0x4000002 syz-fuzzer 60651 186759 55717 0 3 0x4000082 thrsleep syz-fuzzer 60651 93199 55717 0 2 0x4000002 syz-fuzzer 60651 210182 55717 0 3 0x4000082 thrsleep syz-fuzzer 60651 481338 55717 0 3 0x4000082 thrsleep syz-fuzzer 60651 200640 55717 0 2 0x4000002 syz-fuzzer 60651 243711 55717 0 3 0x4000082 thrsleep syz-fuzzer 60651 394884 55717 0 3 0x4000082 thrsleep syz-fuzzer 60651 482480 55717 0 3 0x4000082 thrsleep syz-fuzzer 55717 315529 58654 0 3 0x10008a pause ksh 58654 81308 45461 0 2 0x12 sshd 36598 171863 1 0 3 0x100083 ttyin getty 45461 266332 1 0 3 0x80 select sshd 64432 302821 867 74 3 0x100092 bpf pflogd 867 512881 1 0 3 0x80 netio pflogd 33277 9004 2059 73 3 0x100090 kqread syslogd 2059 444293 1 0 3 0x100082 netio syslogd 39594 187132 1 77 3 0x100090 poll dhclient 13078 524003 1 0 3 0x80 poll dhclient 35595 342043 0 0 3 0x14200 bored smr 27880 480835 0 0 2 0x14200 zerothread 64018 42412 0 0 3 0x14200 aiodoned aiodoned 33201 355625 0 0 3 0x14200 syncer update 77619 380613 0 0 3 0x14200 cleaner cleaner 12581 111379 0 0 3 0x14200 reaper reaper 92466 222225 0 0 3 0x14200 pgdaemon pagedaemon 3116 96963 0 0 3 0x14200 bored crynlk 60458 282001 0 0 3 0x14200 bored crypto 85966 305481 0 0 3 0x40014200 acpi0 acpi0 39261 169623 0 0 3 0x40014200 idle1 14255 342029 0 0 7 0x14200 softnet 77975 198125 0 0 3 0x14200 bored systqmp 41733 331117 0 0 3 0x14200 bored systq 69621 59415 0 0 3 0x40014200 bored softclock 91087 343397 0 0 3 0x40014200 idle0 1 351799 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &map->flags_lock r = 0 (0xffffffff82544700) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 vm_map_lock_ln+0x7d sys/uvm/uvm_map.c:5437 #4 uvm_map+0x2d0 sys/uvm/uvm_map.c:1236 #5 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335 #6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #7 fork1+0x271 sys/kern/kern_fork.c:365 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #9 Xsyscall+0x128 Process 47006 (syz-executor.0) thread 0xffff800020ec7d58 (115844) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82644b58) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570 #2 Xsyscall+0x128 exclusive mutex &map->flags_lock r = 0 (0xffffffff82544700) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 vm_map_lock_ln+0x7d sys/uvm/uvm_map.c:5437 #4 uvm_map+0x2d0 sys/uvm/uvm_map.c:1236 #5 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335 #6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274 #7 fork1+0x271 sys/kern/kern_fork.c:365 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #9 Xsyscall+0x128 Process 14255 (softnet) thread 0xffff800020e18750 (342029) exclusive rwlock netlock r = 0 (0xffffffff824b2b58) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 if_input_process+0x85 sys/net/if.c:941 #2 ifiq_process+0x80 sys/net/ifq.c:646 #3 taskq_thread+0x9c sys/kern/kern_task.c:369 #4 proc_trampoline+0x1c shared rwlock softnet r = 0 (0xffff80000002b0e0) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 taskq_thread+0x8f sys/kern/kern_task.c:368 #2 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9529 6427K 6681K 78643K 11058 0 pcb 13 8K 8K 78643K 71 0 rtable 79 3K 4K 78643K 342 0 ifaddr 74 14K 14K 78643K 130 0 counters 43 33K 34K 78643K 63 0 ioctlops 0 0K 4K 78643K 1496 0 iov 0 0K 16K 78643K 48 0 mount 1 1K 1K 78643K 1 0 vnodes 1224 77K 77K 78643K 1405 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 29 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 6 17K 25K 78643K 468 0 sigio 0 0K 0K 78643K 2 0 proc 61 63K 83K 78643K 516 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 31 0 in_multi 29 1K 2K 78643K 71 0 ether_multi 1 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 237 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 116 38K 38K 78643K 2278 0 UVM aobj 16 2K 2K 78643K 18 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 42 0 NDP 13 0K 0K 78643K 29 0 temp 108 3035K 3099K 78643K 6011 0 kqueue 3 4K 12K 78643K 19 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 8 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 46 0 44 1 0 1 1 0 8 0 rtentry 112 61 0 33 2 0 2 2 0 8 0 unpcb 120 173 0 163 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 985 0 985 1 1 0 1 0 8 0 tcpcb 544 100 0 96 1 0 1 1 0 8 0 inpcb 280 1057 0 1050 2 1 1 2 0 8 0 nd6 48 9 0 6 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 ppxss 1128 2 0 2 2 1 1 1 0 8 1 pffrag 232 3 0 3 1 1 0 1 0 482 0 pffrnode 88 3 0 3 1 1 0 1 0 8 0 pffrent 40 93 0 93 1 1 0 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 34 0 9 1 0 1 1 0 8 0 pfstkey 112 34 0 9 1 0 1 1 0 8 0 pfstate 328 34 0 9 3 0 3 3 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 256 247 0 137 14 4 10 13 0 8 0 art_table 32 248 0 137 2 0 2 2 0 8 0 art_node 16 59 0 36 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 16 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2004 0 599 89 0 89 89 0 8 0 ffsino 272 2004 0 599 95 0 95 95 0 8 0 nchpl 144 2804 0 1211 60 0 60 60 0 8 0 uvmvnodes 72 2179 0 0 40 0 40 40 0 8 0 vnodes 208 2179 0 0 115 0 115 115 0 8 0 namei 1024 7470 0 7470 2 1 1 1 0 8 1 percpumem 16 42 0 10 1 0 1 1 0 8 0 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 560 4 0 2 1 0 1 1 0 8 0 scxspl 192 8890 0 8890 8 7 1 7 0 8 1 plimitpl 152 48 0 40 1 0 1 1 0 8 0 sigapl 424 681 0 648 4 0 4 4 0 8 0 futexpl 56 5237 0 5237 2 1 1 1 0 8 1 knotepl 112 91 0 72 1 0 1 1 0 8 0 kqueuepl 144 37 0 35 1 0 1 1 0 8 0 pipelkpl 48 119 0 109 1 0 1 1 0 8 0 pipepl 120 238 0 219 1 0 1 1 0 8 0 fdescpl 496 665 0 648 3 0 3 3 0 8 0 filepl 152 3636 0 3536 5 0 5 5 0 8 1 lockfpl 104 84 0 83 1 0 1 1 0 8 0 lockfspl 48 23 0 22 1 0 1 1 0 8 0 sessionpl 112 19 0 8 1 0 1 1 0 8 0 pgrppl 48 19 0 8 1 0 1 1 0 8 0 ucredpl 96 235 0 226 1 0 1 1 0 8 0 zombiepl 144 648 0 648 1 0 1 1 0 8 1 processpl 984 681 0 648 5 0 5 5 0 8 0 procpl 624 1467 0 1425 4 0 4 4 0 8 0 srpgc 64 2 0 2 1 1 0 1 0 8 0 sosppl 128 4 0 4 1 1 0 1 0 8 0 sockpl 400 1281 0 1262 4 1 3 4 0 8 1 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 202 0 0 25 0 25 25 0 8 0 mtagpl 80 21 0 0 1 0 1 1 0 8 0 mbufpl 256 468 0 0 29 0 29 29 0 8 0 bufpl 280 4852 0 141 337 0 337 337 0 8 0 anonpl 16 80644 0 66144 70 9 61 69 0 124 0 amapchunkpl 152 3051 0 2922 9 3 6 8 0 158 0 amappl16 192 3372 0 2563 53 11 42 53 0 8 0 amappl15 184 2 0 1 2 1 1 1 0 8 0 amappl14 176 23 0 18 1 0 1 1 0 8 0 amappl13 168 44 0 40 1 0 1 1 0 8 0 amappl12 160 374 0 371 1 0 1 1 0 8 0 amappl11 152 78 0 62 1 0 1 1 0 8 0 amappl10 144 71 0 65 1 0 1 1 0 8 0 amappl9 136 391 0 389 1 0 1 1 0 8 0 amappl8 128 357 0 328 2 0 2 2 0 8 0 amappl7 120 174 0 162 1 0 1 1 0 8 0 amappl6 112 25 0 20 1 0 1 1 0 8 0 amappl5 104 784 0 769 1 0 1 1 0 8 0 amappl4 96 503 0 474 1 0 1 1 0 8 0 amappl3 88 120 0 114 1 0 1 1 0 8 0 amappl2 80 3740 0 3675 2 0 2 2 0 8 0 amappl1 72 22728 0 22300 23 13 10 18 0 8 0 amappl 80 1732 0 1689 2 0 2 2 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 17 0 2 1 0 1 1 0 8 0 uaddrrnd 24 669 0 650 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 669 0 650 1 0 1 1 0 8 0 vmmpekpl 168 8236 0 8196 2 0 2 2 0 8 0 vmmpepl 168 87006 0 85003 127 20 107 117 0 357 16 vmsppl 368 668 0 650 2 0 2 2 0 8 0 pdppl 4096 1346 0 1302 6 0 6 6 0 8 0 pvpl 32 261772 0 244193 171 8 163 171 0 265 16 pmappl 232 668 0 650 3 1 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 283 0 9 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffc1890, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020e00ff0) 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 x86_bus_space_io_write_1(3f8,0,3a) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759 comcnputc(800,3a) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline] comcnputc(800,3a) at comcnputc+0x131 sys/dev/ic/com.c:1254 cnputc(3a) at cnputc+0x4c sys/dev/cons.c:239 kputchar(3a,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343 kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700 panic(ffffffff821fac58) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline] panic(ffffffff821fac58) at panic+0xf3 sys/kern/subr_prf.c:197 pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff826919c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000a0aee0) at tcp_output+0x14e6 tcp_input(ffff800020e398e8,ffff800020e398f4,6,2) at tcp_input+0x2356 end trace frame: 0xffff800020e397a0, count: 0 ddb{1}> trace x86_ipi_db(ffff800020e00ff0) 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 x86_bus_space_io_write_1(3f8,0,3a) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759 comcnputc(800,3a) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline] comcnputc(800,3a) at comcnputc+0x131 sys/dev/ic/com.c:1254 cnputc(3a) at cnputc+0x4c sys/dev/cons.c:239 kputchar(3a,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343 kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700 panic(ffffffff821fac58) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline] panic(ffffffff821fac58) at panic+0xf3 sys/kern/subr_prf.c:197 pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff826919c8,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000a0aee0) at tcp_output+0x14e6 tcp_input(ffff800020e398e8,ffff800020e398f4,6,2) at tcp_input+0x2356 ip_deliver(ffff800020e398e8,ffff800020e398f4,6,2) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip_ours(ffff800020e398e8,ffff800020e398f4,ffff800020e18750,0) at ip_ours+0x412 ip_input_if(ffff800020e398e8,ffff800020e398f4,4,0,ffff80000017b2a8) at ip_input_if+0x6ce ipv4_input(ffff80000017b2a8,fffffd8064c1f400) at ipv4_input+0x48 sys/netinet/ip_input.c:215 ether_input(ffff80000017b2a8,fffffd8064c1f400,0) at ether_input+0x345 sys/net/if_ethersubr.c:461 if_input_process(ffff80000017b2a8,ffff800020e39a18) at if_input_process+0x10b if_ih_input sys/net/if.c:908 [inline] if_input_process(ffff80000017b2a8,ffff800020e39a18) at if_input_process+0x10b sys/net/if.c:942 ifiq_process(ffff80000017b6a0) at ifiq_process+0x80 sys/net/ifq.c:646 taskq_thread(ffff80000002b080) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: -22