kernel: protection fault trap, code=0 Stopped at memcmp+0x16: repe cmpsq (%rsi),%es:(%rdi) ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace memcmp() at memcmp+0x16 pipex_unlink_session_locked(ffff80003c440000) at pipex_unlink_session_locked+0x11f sys/net/pipex.c:-1 pipex_destroy_all_sessions(ffff80000148c000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff80000148c000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:154 pppacclose(637e,41,2000,ffff80003c4262c0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c413500) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806b5592b0,41,fffffd80097fb478,ffff80003c4262c0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069421b88,ffff80003c4262c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069421b88,ffff80003c4262c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069421b88,ffff80003c4262c0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8069421b88,ffff80003c4262c0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c4262c0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c4262c0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c4262c0,ffff80003c413870,ffff80003c4137c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c413870) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c413870) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76d15293ea40, count: -14 ddb{0}> show registers rdi 0xffff80003c440104 rsi 0xdeafbeaddeafbeb1 rbp 0xffff80003c4133a0 rbx 0xc rdx 0xc rcx 0x1 rax 0xffffffff837bdff0 cpu_info_full_primary+0x1ff0 r8 0xffffffffffffffff r9 0 r10 0x5af7fb8026a51ff6 r11 0x401cd069cd1b8810 r12 0xffff80003c440104 r13 0 r14 0xffff80003c4412d0 r15 0x4 rip 0xffffffff810b2d36 memcmp+0x16 cs 0x8 rflags 0x10203 __ALIGN_SIZE+0xf203 rsp 0xffff80003c413338 ss 0 memcmp+0x16: repe cmpsq (%rsi),%es:(%rdi) ddb{0}> show proc PROC (syz-executor) tid=518307 pid=53593 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c4262c0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c426fb8,0xffff80003c426038 process=0xffff80002a3d04e8 user=0xffff80003c40e000, vmspace=0xfffffd806b7ce7c0 estcpu=36, cpticks=6, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 98805 522641 17389 0 2 0 syz-executor 98805 453070 17389 0 3 0x4000080 msgwait syz-executor 98805 155887 17389 0 3 0x4000080 msgwait syz-executor 48258 445441 13451 0 3 0x80 nanoslp syz-executor 48258 251327 13451 0 2 0x4000000 syz-executor 48258 37172 13451 0 3 0x4000080 fsleep syz-executor 74178 148700 20105 0 2 0 syz-executor 74178 76693 20105 0 3 0x4000080 fsleep syz-executor 14264 132885 93339 0 3 0x80 nanoslp syz-executor 14264 169879 93339 0 3 0x4000080 bell syz-executor 14264 484674 93339 0 3 0x4000080 fsleep syz-executor 79578 230845 42842 0 3 0x80 nanoslp syz-executor 79578 118951 42842 0 3 0x4000080 fsleep syz-executor 79578 283103 42842 0 3 0x4000080 ttyin syz-executor 79578 310904 42842 0 3 0x4000080 fsleep syz-executor 17389 516112 56005 0 2 0x2 syz-executor 42842 257604 56005 0 3 0x82 nanoslp syz-executor 13451 182020 56005 0 3 0x82 nanoslp syz-executor 93339 118583 56005 0 3 0x82 nanoslp syz-executor 81150 208474 56005 0 3 0x82 nanoslp syz-executor 14294 386944 56005 0 7 0x2 syz-executor 20105 466786 56005 0 3 0x82 nanoslp syz-executor 12753 296000 56005 0 3 0x82 nanoslp syz-executor 56005 141560 22407 0 3 0x82 kqread syz-executor 22407 152354 14603 0 3 0x10008a sigsusp ksh 14603 84991 15313 0 3 0x98 kqread sshd-session 15313 260458 99281 0 3 0x92 kqread sshd-session 94395 359026 1 0 3 0x100083 ttyin getty 99281 511537 1 0 3 0x88 kqread sshd 37300 159863 88687 74 3 0x1100092 bpf pflogd 88687 325192 1 0 3 0x80 sbwait pflogd 71033 241073 99343 73 3 0x1100090 kqread syslogd 99343 454731 1 0 3 0x100082 sbwait syslogd 71546 417218 1 0 3 0x100080 kqread resolvd 59948 506728 64116 77 2 0x100012 dhcpleased 16189 468382 64116 77 3 0x100092 kqread dhcpleased 64116 353442 1 0 3 0x80 kqread dhcpleased 84232 458773 0 0 3 0x14200 bored smr 52422 198248 0 0 3 0x14200 pgzero zerothread 51848 432225 0 0 3 0x14200 aiodoned aiodoned 82051 413180 0 0 3 0x14200 syncer update 59221 473483 0 0 3 0x14200 cleaner cleaner 48722 460689 0 0 3 0x14200 reaper reaper 11947 96590 0 0 3 0x14200 pgdaemon pagedaemon 86316 400537 0 0 3 0x14200 bored viomb 20805 134499 0 0 3 0x40014200 acpi0 acpi0 19305 19496 0 0 3 0x40014200 idle1 39450 87163 0 0 3 0x14200 bored softnet1 56334 521377 0 0 2 0x14200 softnet0 43677 402400 0 0 3 0x14200 bored systqmp 76737 505129 0 0 3 0x14200 bored systq 24471 126428 0 0 3 0x14200 tmoslp softclockmp 22182 257703 0 0 3 0x40014200 tmoslp softclock 21263 302905 0 0 3 0x40014200 idle0 1 439821 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/net/pipex.c:78 r = 0 (0xffffffff837db5d0) #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_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pipex_destroy_all_sessions+0x2f sys/net/pipex.c:147 #4 pppacclose+0x16f sys/net/if_pppx.c:1335 #5 spec_close+0x417 sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #7 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #7 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #8 fdrop+0x121 sys/kern/kern_descrip.c:1280 #9 closef+0x192 sys/kern/kern_descrip.c:1264 #10 fdfree+0x116 sys/kern/kern_descrip.c:1195 #11 exit1+0x576 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #14 Xsyscall+0x128 Process 56334 (softnet0) thread 0xffff8000ffffe530 (521377) shared rwlock softnet0 r = 0 (0xffff80000002c078) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10205 11153K 11264K 166960K 11340 0 pcb 17 12K 12K 166960K 29 0 rtable 210 7K 7K 166960K 272 0 pf 34 17K 19K 166960K 57 0 ifaddr 43 7K 7K 166960K 51 0 ifgroup 55 2K 2K 166960K 63 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 38K 166960K 84 0 ioctlops 0 0K 4K 166960K 1495 0 iov 0 0K 2K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1347 85K 85K 166960K 1401 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 181 0 proc 71 115K 180K 166960K 533 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 13 0 in_multi 99 7K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 377 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 255 160K 169K 166960K 3454 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 43 86K 107K 166960K 1292 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 8 0 NDP 14 0K 1K 166960K 32 0 temp 37 8638K 8702K 166960K 4776 0 kqueue 13 20K 28K 166960K 31 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 42 0 39 1 0 1 1 0 8 0 rtentry 176 95 0 1 5 0 5 5 0 8 0 unpcb 144 41 0 24 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 22 0 16 1 0 1 1 0 8 0 arp 136 10 0 0 1 0 1 1 0 8 0 inpcb 328 109 0 98 2 0 2 2 0 8 1 nd6 144 16 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 8 0 7 1 0 1 1 0 8 0 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 4 0 1 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pftag 88 1 0 1 1 0 1 1 0 8 1 pfstitem 24 17 0 0 1 0 1 1 0 8 0 pfstkey 128 17 0 0 1 0 1 1 0 8 0 pfstate 384 17 0 0 2 0 2 2 0 8 0 pfrule 1344 24 0 18 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 437 0 0 28 0 28 28 0 8 0 art_table 40 438 0 0 5 0 5 5 0 8 0 art_node 32 95 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 7 0 2 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1648 0 134 96 0 96 96 0 8 0 ffsino 296 1648 0 134 117 0 117 117 0 8 0 nchpl 144 1890 0 195 63 0 63 63 0 8 0 rtmask 32 2 0 1 1 0 1 1 0 8 0 uvmvnodes 80 1757 0 0 36 0 36 36 0 8 0 vnodes 216 1757 0 0 98 0 98 98 0 8 0 namei 1024 5794 0 5794 1 0 1 1 0 8 1 percpumem 16 57 0 7 1 0 1 1 0 8 0 kstatmem 264 34 0 8 3 0 3 3 0 8 1 scxspl 216 6763 0 6763 3 1 2 2 1 8 2 plimitpl 152 34 0 17 1 0 1 1 0 8 0 sigapl 424 487 0 439 7 0 7 7 0 8 1 knotepl 120 312 0 0 10 0 10 10 0 8 0 kqueuepl 224 38 0 28 2 0 2 2 0 8 1 pipepl 344 107 0 80 3 0 3 3 0 8 0 fdescpl 528 471 0 439 3 0 3 3 0 8 0 filepl 160 1670 0 1436 10 0 10 10 0 8 0 lockfpl 104 25 0 22 1 0 1 1 0 8 0 lockfspl 48 13 0 10 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 30 0 13 1 0 1 1 0 8 0 ucredpl 104 125 0 111 1 0 1 1 0 8 0 zombiepl 144 442 0 439 1 0 1 1 0 8 0 processpl 1232 487 0 439 5 0 5 5 0 8 1 procpl 664 581 0 523 6 0 6 6 0 8 1 sockpl 752 193 0 162 4 0 4 4 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 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 140 0 0 9 0 9 9 0 8 0 bufpl 280 3017 0 122 207 0 207 207 0 8 0 anonpl 32 3960 0 0 32 0 32 32 0 246 0 amapchunkpl 152 9789 0 9244 22 1 21 21 0 158 0 amappl16 200 2008 0 1981 5 1 4 5 0 8 2 amappl15 192 10 0 10 2 1 1 1 0 8 1 amappl14 184 115 0 103 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1127 0 1095 4 1 3 3 0 8 1 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 12 0 12 1 1 0 1 0 8 0 amappl9 144 251 0 250 1 0 1 1 0 8 0 amappl8 136 27 0 25 1 0 1 1 0 8 0 amappl7 128 107 0 95 1 0 1 1 0 8 0 amappl6 120 183 0 180 1 0 1 1 0 8 0 amappl5 112 125 0 116 1 0 1 1 0 8 0 amappl4 104 314 0 293 1 0 1 1 0 8 0 amappl3 96 1507 0 1398 4 1 3 3 0 8 0 amappl2 88 701 0 624 2 0 2 2 0 8 0 amappl1 80 8470 0 7859 15 0 15 15 0 8 2 amappl 88 2758 0 2575 5 0 5 5 0 92 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 471 0 439 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 471 0 439 1 0 1 1 0 8 0 vmmpekpl 168 5438 0 5406 2 0 2 2 0 8 0 vmmpepl 168 36933 0 34897 89 0 89 89 0 357 0 vmsppl 488 470 0 439 5 0 5 5 0 8 1 rwobjpl 80 14832 0 12121 56 0 56 56 0 8 0 pdppl 4096 950 0 878 108 32 76 88 0 8 4 pvpl 32 10556 0 0 86 0 86 86 0 265 0 pmappl 256 470 0 439 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 276 0 34 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace memcmp() at memcmp+0x16 pipex_unlink_session_locked(ffff80003c440000) at pipex_unlink_session_locked+0x11f sys/net/pipex.c:-1 pipex_destroy_all_sessions(ffff80000148c000) at pipex_destroy_all_sessions+0xd9 pipex_rele_session sys/net/pipex.c:-1 [inline] pipex_destroy_all_sessions(ffff80000148c000) at pipex_destroy_all_sessions+0xd9 sys/net/pipex.c:154 pppacclose(637e,41,2000,ffff80003c4262c0) at pppacclose+0x16f sys/net/if_pppx.c:1335 spec_close(ffff80003c413500) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806b5592b0,41,fffffd80097fb478,ffff80003c4262c0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069421b88,ffff80003c4262c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069421b88,ffff80003c4262c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069421b88,ffff80003c4262c0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8069421b88,ffff80003c4262c0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c4262c0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c4262c0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c4262c0,ffff80003c413870,ffff80003c4137c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c413870) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c413870) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76d15293ea40, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(ffffffff839678b8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839678b8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80002a3387e0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a3387e0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x771551d67d30, count: -6