uvm_fault(0xfffff8806cf5eb98, 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 170818 583 0 0 0 0 syz-executor * 69760 10879 0 0 0x4000000 1K syz-executor sys_shmat(ffff800045ffd4c8,ffff80002a2b2e40,ffff80002a2b2d90) at sys_shmat+0x453 sys/kern/sysv_shm.c:290 syscall(ffff80002a2b2e40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2b2e40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe637ad81c10, 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(0xfffff8806cf5eb98, 0x0, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace sys_shmat(ffff800045ffd4c8,ffff80002a2b2e40,ffff80002a2b2d90) at sys_shmat+0x453 sys/kern/sysv_shm.c:290 syscall(ffff80002a2b2e40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2b2e40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe637ad81c10, count: -3 ddb{1}> show registers rdi 0 rsi 0x2000 __ALIGN_SIZE+0x1000 rbp 0xffff80002a2b2d60 rbx 0xfffff8807ca75ee8 rdx 0 rcx 0 rax 0 r8 0x100 r9 0xfffff880097fd208 r10 0 r11 0xe8842df077c790ff r12 0xffff800045ffd4c8 r13 0xffff800001602010 r14 0x1 r15 0 rip 0xffffffff832350f3 sys_shmat+0x453 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a2b2cd0 ss 0x10 sys_shmat+0x453: movq 0(%r15),%rdi ddb{1}> show proc PROC (syz-executor) tid=69760 pid=10879 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=0xffff800045ffc008,0xffff800045ffdca0 process=0xffff800045fef508 user=0xffff80002a2ad000, vmspace=0xfffff8806cf5eb98 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 92061 476834 33842 0 2 0x100002 0 sh 583 170818 67592 0 7 0 0 syz-executor 583 30937 67592 0 3 0 0x4000080 fsleep syz-executor 583 267988 67592 0 2 0 0x4000000 syz-executor 43825 241339 37195 0 2 0 0 syz-executor 43825 95669 37195 0 3 0 0x4000080 fsleep syz-executor 85316 437336 30265 0 2 0 0 syz-executor 85316 243643 30265 0 3 0 0x4000080 fsleep syz-executor 85316 411392 30265 0 3 0 0x4000080 fsleep syz-executor 85316 353464 30265 0 3 0 0x4000080 fsleep syz-executor 10879 160550 41758 0 2 0 0 syz-executor 10879 352231 41758 0 2 0 0x4000000 syz-executor *10879 69760 41758 0 7 0 0x4000000 syz-executor 10879 50462 41758 0 2 0 0x4000000 syz-executor 33842 135338 74166 0 3 0x2 0x80 wait syz-executor 56685 522480 74166 0 2 0x2 0 syz-executor 53884 199567 22526 0 3 0x100002 0x80 sbwait arp 22526 27891 99716 0 3 0x100002 0x88 sigsusp sh 99716 42533 74166 0 3 0x2 0x80 wait syz-executor 67592 492195 74166 0 3 0x2 0x80 nanoslp syz-executor 10003 391354 74166 0 2 0x2 0x1 syz-executor 37195 373066 74166 0 3 0x2 0x80 nanoslp syz-executor 41758 199055 74166 0 3 0x2 0x80 nanoslp syz-executor 30265 513271 74166 0 3 0x2 0x80 nanoslp syz-executor 74166 99433 94345 0 3 0x2 0x80 kqread syz-executor 94345 202655 92798 0 3 0x100002 0x88 sigsusp ksh 92798 226594 69391 0 3 0x10 0x88 kqread sshd-session 69391 162258 67383 0 3 0x12 0x80 kqread sshd-session 72235 498250 1 0 3 0x100003 0x80 ttyin getty 67383 352518 1 0 3 0 0x88 kqread sshd 45710 236505 98320 74 3 0x1100012 0x80 bpf pflogd 98320 267668 1 0 3 0 0x80 sbwait pflogd 42677 183117 41245 73 3 0x1100010 0x80 kqread syslogd 41245 170066 1 0 3 0x100002 0x80 sbwait syslogd 94118 508350 1 0 3 0x100000 0x80 kqread resolvd 15136 204614 17987 77 3 0x100012 0x80 kqread dhcpleased 86746 311879 17987 77 3 0x100012 0x80 kqread dhcpleased 17987 412936 1 0 3 0 0x80 kqread dhcpleased 49419 90673 0 0 3 0x14000 0x200 bored smr 93368 503510 0 0 2 0x14000 0x200 zerothread 79216 19058 0 0 3 0x14000 0x200 aiodoned aiodoned 57239 246226 0 0 3 0x14000 0x200 syncer update 39305 110275 0 0 3 0x14000 0x200 cleaner cleaner 19207 331374 0 0 3 0x14000 0x200 reaper reaper 53838 165911 0 0 3 0x14000 0x200 pgdaemon pagedaemon 36229 253111 0 0 3 0x14000 0x200 bored viomb 36360 317574 0 0 3 0x14000 0x40000200 acpi0 acpi0 76812 523262 0 0 3 0x14000 0x40000200 idle1 43313 67319 0 0 3 0x14000 0x200 bored softnet1 13788 256719 0 0 3 0x14000 0x200 bored softnet0 90097 64508 0 0 3 0x14000 0x200 smrbar systqmp 59042 401551 0 0 3 0x14000 0x200 bored systq 48342 333644 0 0 3 0x14000 0x200 tmoslp softclockmp 84251 506578 0 0 3 0x14000 0x40000200 tmoslp softclock 25736 24292 0 0 3 0x14000 0x40000200 idle0 1 24195 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks Process 583 (syz-executor) thread 0xffff800045fead18 (267988) exclusive rwlock vmmaplk r = 0 (0xfffff8806cf5e4f8) #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:194 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:648 #7 recall_trap+0x8 Process 10879 (syz-executor) thread 0xffff800045ffd4c8 (69760) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83ad7b00) #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:791 #5 Xsyscall+0x128 Process 56685 (syz-executor) thread 0xffff800045fea020 (522480) exclusive rrwlock inode r = 0 (0xfffff8806bb7f318) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3048 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 Process 90097 (systqmp) thread 0xffff800045ffe000 (64508) shared rwlock systqmp r = 0 (0xffffffff83961388) #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 11054 12085K 12093K 166960K 12157 0 pcb 17 12K 12K 166960K 23 0 rtable 225 8K 8K 166960K 406 0 pf 34 17K 24K 166960K 71 0 ifaddr 41 7K 7K 166960K 51 0 ifgroup 55 2K 2K 166960K 63 0 sysctl 3 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1487 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1290 81K 81K 166960K 1391 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 186 0 proc 70 115K 180K 166960K 602 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 5 0 in_multi 89 6K 6K 166960K 111 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 417 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 224 170K 176K 166960K 3497 0 UVM aobj 4 2K 2K 166960K 5 0 pinsyscall 43 86K 102K 166960K 1412 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 16 0K 1K 166960K 32 0 temp 38 9114K 9135K 166960K 5656 0 kqueue 13 20K 24K 166960K 31 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 176 124 0 23 5 0 5 5 0 8 0 unpcb 144 56 0 37 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 78 0 74 7 6 1 7 0 8 0 arp 136 21 0 4 1 0 1 1 0 8 0 inpcb 328 159 0 152 7 5 2 6 0 8 1 nd6 152 26 0 6 1 0 1 1 0 8 0 kcovpl 48 10 0 2 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 pfanchor 1288 4 0 4 1 0 1 1 0 8 1 pfstitem 24 28 0 0 1 0 1 1 0 8 0 pfstkey 128 28 0 0 1 0 1 1 0 8 0 pfstate 448 28 0 0 4 0 4 4 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 256 499 0 88 26 0 26 26 0 8 0 art_table 40 500 0 88 5 0 5 5 0 8 0 art_node 32 124 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 1 2 1 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1610 0 139 93 0 93 93 0 8 0 ffsino 296 1610 0 139 114 0 114 114 0 8 0 nchpl 144 1846 0 139 64 0 64 64 0 8 0 vnodes 216 1722 0 0 96 0 96 96 0 8 0 namei 1024 6661 0 6660 5 3 2 2 0 8 1 percpumem 16 53 0 2 1 0 1 1 0 8 0 kstatmem 264 31 0 4 2 0 2 2 0 8 0 scxspl 216 6364 0 6364 4 3 1 3 1 8 1 plimitpl 152 37 0 20 1 0 1 1 0 8 0 sigapl 424 508 0 461 7 1 6 7 0 8 0 knotepl 120 57 0 0 2 0 2 2 0 8 0 kqueuepl 224 29 0 20 1 0 1 1 0 8 0 pipepl 344 138 0 111 3 0 3 3 0 8 0 fdescpl 528 492 0 461 3 0 3 3 0 8 0 filepl 160 1831 0 1618 12 2 10 12 0 8 0 lockfpl 104 14 0 11 1 0 1 1 0 8 0 lockfspl 48 8 0 5 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 116 0 103 1 0 1 1 0 8 0 zombiepl 144 471 0 471 1 0 1 1 0 8 1 processpl 1232 508 0 461 5 0 5 5 0 8 0 procpl 664 569 0 512 6 1 5 6 0 8 0 sockpl 752 258 0 228 10 6 4 10 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 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 2333 0 105 149 0 149 149 0 8 0 anonpl 32 3834 0 0 31 0 31 31 0 247 0 amapchunkpl 152 9470 0 9040 20 1 19 19 0 158 1 amappl16 200 1881 0 1865 5 4 1 5 0 8 0 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 461 0 458 1 0 1 1 0 8 0 amappl13 176 127 0 114 1 0 1 1 0 8 0 amappl12 168 760 0 730 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 276 0 275 1 0 1 1 0 8 0 amappl8 136 113 0 111 1 0 1 1 0 8 0 amappl7 128 154 0 139 1 0 1 1 0 8 0 amappl6 120 175 0 172 1 0 1 1 0 8 0 amappl5 112 103 0 93 1 0 1 1 0 8 0 amappl4 104 304 0 284 1 0 1 1 0 8 0 amappl3 96 1627 0 1541 3 0 3 3 0 8 0 amappl2 88 612 0 534 2 0 2 2 0 8 0 amappl1 80 10886 0 10259 15 1 14 15 0 8 0 amappl 88 2732 0 2585 4 0 4 4 0 92 0 uvmvnodes 80 99 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 4 0 1 1 0 1 1 0 8 0 uaddrrnd 24 493 0 462 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 493 0 462 1 0 1 1 0 8 0 vmmpekpl 168 6017 0 5970 3 0 3 3 0 8 0 vmmpepl 168 41247 0 39395 88 2 86 88 0 357 1 vmsppl 488 492 0 462 6 1 5 5 0 8 0 rwobjpl 80 15423 0 14373 24 1 23 24 0 8 0 pdppl 4096 993 0 924 105 30 75 83 0 8 6 pvpl 32 10035 0 0 84 3 81 82 0 265 0 pmappl 256 492 0 462 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 437 0 43 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83925ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83ad7300) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ad7300) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x742812258550, count: 7 ddb{0}> trace x86_ipi_db(ffffffff83925ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83ad7300) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ad7300) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x742812258550, count: -8 ddb{0}> machine ddbcpu 1 Stopped at sys_shmat+0x453: movq 0(%r15),%rdi sys_shmat(ffff800045ffd4c8,ffff80002a2b2e40,ffff80002a2b2d90) at sys_shmat+0x453 sys/kern/sysv_shm.c:290 syscall(ffff80002a2b2e40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2b2e40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe637ad81c10, count: 12 ddb{1}> trace sys_shmat(ffff800045ffd4c8,ffff80002a2b2e40,ffff80002a2b2d90) at sys_shmat+0x453 sys/kern/sysv_shm.c:290 syscall(ffff80002a2b2e40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2b2e40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe637ad81c10, count: -3