uvm_fault(0xfffff50069c859a8, 0x0, 0, 1) -> e kernel: page fault trap, code=0 Stopped at sys_shmat+0x453: movq 0(%r15),%rdi TID PID UID PRFLAGS PFLAGS CPU COMMAND 90393 27822 0 0 0 0 syz-executor *379098 86586 0 0 0x4000000 1K syz-executor sys_shmat(ffff800045fefca0,ffff80003a3a3b70,ffff80003a3a3ac0) at sys_shmat+0x453 sys/kern/sysv_shm.c:290 syscall(ffff80003a3a3b70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a3a3b70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1222a96e0, count: 12 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 *cpu1: uvm_fault(0xfffff50069c859a8, 0x0, 0, 1) -> e ddb{1}> trace sys_shmat(ffff800045fefca0,ffff80003a3a3b70,ffff80003a3a3ac0) at sys_shmat+0x453 sys/kern/sysv_shm.c:290 syscall(ffff80003a3a3b70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a3a3b70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1222a96e0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003a3a3a90 rbx 0xfffff5006ca4fee0 rdx 0 rcx 0x1 rax 0x1 r8 0x180 r9 0xfffff500097fd3a8 r10 0 r11 0x98c2606492d2da0c r12 0xffff800045fefca0 r13 0xffff800001600010 r14 0x3 r15 0 rip 0xffffffff81bdaee3 sys_shmat+0x453 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003a3a3a00 ss 0x10 sys_shmat+0x453: movq 0(%r15),%rdi ddb{1}> show proc PROC (syz-executor) tid=379098 pid=86586 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fef4d8,0xffff80003c3b8560 process=0xffff80003c3d79e0 user=0xffff80003a39e000, vmspace=0xfffff50069c859a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 52239 199691 25446 0 2 0 syz-executor 52239 174266 25446 0 2 0x4000000 syz-executor 27822 90393 39716 0 7 0 syz-executor 27822 307074 39716 0 3 0x4000080 fsleep syz-executor 27822 449835 39716 0 2 0x4000000 syz-executor 38130 155594 1 0 3 0x82 nanoslp getty 78613 275995 77650 0 2 0 syz-executor 78613 310499 77650 0 2 0x4000000 syz-executor 78613 59325 77650 0 3 0x4000080 kqpoll syz-executor 78613 466460 77650 0 3 0x4000080 fsleep syz-executor 96156 229075 72249 0 3 0 kmmaplk syz-executor 96156 239201 72249 0 3 0x4000080 fsleep syz-executor 86586 184350 99440 0 2 0 syz-executor 86586 515482 99440 0 2 0x4000000 syz-executor *86586 379098 99440 0 7 0x4000000 syz-executor 86586 224586 99440 0 2 0x4000000 syz-executor 3972 301473 85862 0 3 0x100082 sbwait ndp 85862 157144 11388 0 3 0x10008a sigsusp sh 96258 89274 82012 0 3 0x82 nanoslp syz-executor 25446 405212 82012 0 3 0x82 nanoslp syz-executor 77650 387818 82012 0 3 0x82 nanoslp syz-executor 39716 496106 82012 0 3 0x82 nanoslp syz-executor 99440 268308 82012 0 3 0x82 nanoslp syz-executor 72249 442276 82012 0 3 0x82 nanoslp syz-executor 11388 329609 82012 0 3 0x82 wait syz-executor 82012 93288 13875 0 3 0x82 wait syz-executor 13875 243829 9268 0 3 0x10008a sigsusp ksh 9268 377727 41297 0 3 0x98 kqread sshd-session 41297 222788 65801 0 3 0x92 kqread sshd-session 65801 336056 1 0 3 0x88 kqread sshd 50218 14011 78438 74 3 0x1100092 bpf pflogd 78438 417805 1 0 3 0x80 sbwait pflogd 32231 143101 40520 73 3 0x1100090 kqread syslogd 40520 250119 1 0 3 0x100082 sbwait syslogd 2351 291334 1 0 3 0x100080 kqread resolvd 50896 443996 8641 77 3 0x100092 kqread dhcpleased 54355 257019 8641 77 3 0x100092 kqread dhcpleased 8641 225251 1 0 3 0x80 kqread dhcpleased 83983 215016 0 0 3 0x14200 bored smr 50800 325550 0 0 2 0x14200 zerothread 13801 512873 0 0 3 0x14200 aiodoned aiodoned 76029 408977 0 0 3 0x14200 syncer update 45686 524245 0 0 3 0x14200 cleaner cleaner 68137 248319 0 0 3 0x14200 reaper reaper 26593 126966 0 0 3 0x14200 pgdaemon pagedaemon 47986 159915 0 0 3 0x14200 bored viomb 27959 395547 0 0 3 0x40014200 acpi0 acpi0 9261 253974 0 0 3 0x40014200 idle1 99841 108436 0 0 3 0x14200 bored softnet1 59651 247491 0 0 3 0x14200 bored softnet0 15789 249342 0 0 3 0x14200 smrbar systqmp 58882 341318 0 0 3 0x14200 bored systq 42396 159498 0 0 3 0x14200 tmoslp softclockmp 45108 165226 0 0 3 0x40014200 tmoslp softclock 42412 229966 0 0 3 0x40014200 idle0 1 143670 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 27822 (syz-executor) thread 0xffff80003c3b6558 (449835) exclusive rwlock vmmaplk r = 0 (0xfffff5006cbee6d0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 78613 (syz-executor) thread 0xffff800045fee018 (310499) exclusive rwlock fdlock r = 0 (0xffff80003b7abb40) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 ptmioctl+0x13c sys/kern/tty_pty.c:1094 #3 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #4 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537 #5 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 Process 86586 (syz-executor) thread 0xffff800045fefca0 (379098) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83acc800) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 malloc+0xe3 sys/kern/kern_malloc.c:175 #3 sys_shmat+0x9f sys/kern/sysv_shm.c:-1 #4 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 Process 15789 (systqmp) thread 0xffff800045ffe298 (249342) shared rwlock systqmp r = 0 (0xffffffff83944c58) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11056 12211K 12214K 166960K 12239 0 pcb 20 14K 16K 166960K 107 0 rtable 219 7K 7K 166960K 375 0 pf 32 17K 18K 166960K 50 0 ifaddr 39 6K 7K 166960K 47 0 ifgroup 51 2K 2K 166960K 62 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1617 0 iov 0 0K 0K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1416 89K 89K 166960K 1511 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 9 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 168 0 proc 72 115K 180K 166960K 564 0 subproc 67 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 1 0 in_multi 88 6K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 395 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 236 161K 168K 166960K 3575 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 44 88K 103K 166960K 1358 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 25 1K 2K 166960K 30 0 temp 33 9114K 9121K 166960K 4197 0 kqueue 13 20K 24K 166960K 29 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 42 0 38 1 0 1 1 0 8 0 rtentry 176 112 0 14 5 0 5 5 0 8 0 unpcb 144 54 0 37 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 14 0 10 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 226 0 216 12 0 12 12 0 8 10 nd6 152 23 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 1 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 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 448 17 0 0 2 0 2 2 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 256 451 0 0 29 0 29 29 0 8 0 art_table 40 452 0 0 5 0 5 5 0 8 0 art_node 32 110 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 72 5 0 1 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1623 0 155 92 0 92 92 0 8 0 ffsino 296 1623 0 155 114 0 114 114 0 8 0 nchpl 144 1863 0 159 64 0 64 64 0 8 0 vnodes 216 1854 0 0 103 0 103 103 0 8 0 namei 1024 5950 0 5950 3 1 2 2 0 8 2 percpumem 16 53 0 3 1 0 1 1 0 8 0 kstatmem 264 31 0 6 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 6316 0 6316 4 3 1 3 1 8 1 plimitpl 152 33 0 16 1 0 1 1 0 8 0 sigapl 424 495 0 447 7 0 7 7 0 8 0 knotepl 120 295 0 0 9 0 9 9 0 8 0 kqueuepl 224 32 0 22 1 0 1 1 0 8 0 pipepl 344 129 0 102 3 0 3 3 0 8 0 fdescpl 528 479 0 447 3 0 3 3 0 8 0 filepl 160 2090 0 1879 18 0 18 18 0 8 8 lockfpl 104 14 0 12 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 25 0 17 1 0 1 1 0 8 0 pgrppl 48 34 0 18 1 0 1 1 0 8 0 ucredpl 104 116 0 103 1 0 1 1 0 8 0 zombiepl 144 472 0 470 2 1 1 1 0 8 0 processpl 1232 495 0 447 5 0 5 5 0 8 0 procpl 664 563 0 505 6 0 6 6 0 8 0 sockpl 752 322 0 291 18 1 17 17 0 8 13 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 136 0 0 17 0 17 17 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mextrefs 64 20 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 218 0 0 14 0 14 14 0 8 0 bufpl 272 2322 0 105 148 0 148 148 0 8 0 anonpl 32 3726 0 0 31 0 31 31 0 247 0 amapchunkpl 152 9457 0 8990 21 0 21 21 0 158 1 amappl16 200 1623 0 1604 6 4 2 5 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 442 0 440 1 0 1 1 0 8 0 amappl13 176 128 0 114 1 0 1 1 0 8 0 amappl12 168 764 0 733 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 69 0 54 1 0 1 1 0 8 0 amappl9 144 278 0 278 1 1 0 1 0 8 0 amappl8 136 113 0 111 1 0 1 1 0 8 0 amappl7 128 152 0 138 1 0 1 1 0 8 0 amappl6 120 158 0 155 1 0 1 1 0 8 0 amappl5 112 103 0 93 1 0 1 1 0 8 0 amappl4 104 302 0 281 1 0 1 1 0 8 0 amappl3 96 1707 0 1596 4 0 4 4 0 8 0 amappl2 88 560 0 498 2 0 2 2 0 8 0 amappl1 80 10714 0 10084 16 1 15 15 0 8 0 amappl 88 2814 0 2656 4 0 4 4 0 92 0 uvmvnodes 80 102 0 0 3 0 3 3 0 8 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 479 0 447 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 479 0 447 1 0 1 1 0 8 0 vmmpekpl 168 5997 0 5956 2 0 2 2 0 8 0 vmmpepl 168 40150 0 38208 89 1 88 88 0 357 0 vmsppl 488 478 0 447 5 0 5 5 0 8 0 rwobjpl 80 14920 0 13853 25 0 25 25 0 8 1 pdppl 4096 965 0 894 103 22 81 83 0 8 10 pvpl 32 9803 0 0 81 1 80 80 0 265 0 pmappl 256 478 0 447 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 427 0 27 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff839c4ff0) 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 end of kernel end trace frame: 0x7b8e089cb680, count: 12 ddb{0}> trace x86_ipi_db(ffffffff839c4ff0) 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 end of kernel end trace frame: 0x7b8e089cb680, count: -3 ddb{0}> machine ddbcpu 1 Stopped at sys_shmat+0x453: movq 0(%r15),%rdi sys_shmat(ffff800045fefca0,ffff80003a3a3b70,ffff80003a3a3ac0) at sys_shmat+0x453 sys/kern/sysv_shm.c:290 syscall(ffff80003a3a3b70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a3a3b70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1222a96e0, count: 12 ddb{1}> trace sys_shmat(ffff800045fefca0,ffff80003a3a3b70,ffff80003a3a3ac0) at sys_shmat+0x453 sys/kern/sysv_shm.c:290 syscall(ffff80003a3a3b70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a3a3b70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1222a96e0, count: -3