uvm_fault: pmap_page_remove (8)
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syzbot
Aug 10, 2026, 5:58:29 PM (7 days ago) Aug 10
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: b56428e2942e limits.h: bump _POSIX_THREAD_THREADS_MAX to 64
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=157fd079580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=d1a7c2f053cf70b7120e
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c599fd2a78ed/disk-b56428e2.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/8961c52b02d7/bsd-b56428e2.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/50ca66f613de/kernel-b56428e2.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d1a7c2...@syzkaller.appspotmail.com
uvm_fault(0xfffff8806d052028, 0x7f87dd85b2e0, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
294792 10232 32767 0x10 0x4000000 1 syz-executor
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2024
uvm_anfree(fffff8806d518720) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffff880668c4a50) at amap_wipeout+0x1d6 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c3eb120,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1359
uvm_map_teardown(fffff8806d052028) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
exit1(ffff800045fe74e0,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260
sys_exit(ffff800045fe74e0,ffff80003c3eb2f0,ffff80003c3eb240) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c3eb2f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3eb2f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x72ed37c8bf80, count: 6
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
*cpu0: uvm_fault(0xfffff8806d052028, 0x7f87dd85b2e0, 0, 2) -> e
ddb{0}> show kasan
No such command
ddb{0}> trace
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2024
uvm_anfree(fffff8806d518720) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffff880668c4a50) at amap_wipeout+0x1d6 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c3eb120,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1359
uvm_map_teardown(fffff8806d052028) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
exit1(ffff800045fe74e0,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260
sys_exit(ffff800045fe74e0,ffff80003c3eb2f0,ffff80003c3eb240) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c3eb2f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3eb2f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x72ed37c8bf80, count: -9
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003c3eb020
rbx 0xfffff880616b1770
rdx 0
rcx 0x7f8000000000
rax 0
r8 0
r9 0xffff80003c3eb010
r10 0x3777bd85e42e3551
r11 0xf733982456ea8e8c
r12 0
r13 0
r14 0x7dd85b2e0
r15 0xfffff88008259020
rip 0xffffffff81d9c7ad pmap_page_remove+0x45d
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80003c3eafa0
ss 0x10
pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
ddb{0}> show proc
PROC (syz-executor) tid=203538 pid=95045 tcnt=0 stat=onproc
flags process=a<EXEC,EXITING> proc=2000<WEXIT>
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=1
forw=0xffffffffffffffff, list=0xffff800045fe67e8,0xffff800045fe7cb8
process=0xffff80003bfcc4f0 user=0xffff80003c3e6000, vmspace=0xfffff8806d052028
estcpu=36, cpticks=7, pctcpu=0.0, user=0, sys=2, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
26649 334119 79470 32767 2 0x10 0 syz-executor
57127 358902 77744 0 2 0 0 syz-executor
77744 443125 24639 0 3 0x2 0x80 wait syz-executor
10232 49014 39905 32767 2 0x10 0 syz-executor
10232 294792 39905 32767 7 0x10 0x4000000 syz-executor
74311 165128 57475 32767 2 0x10 0 syz-executor
74311 136823 57475 32767 2 0x10 0x4000000 syz-executor
47702 228369 78959 32767 3 0x10 0x80 nanoslp syz-executor
47702 403916 78959 32767 3 0x10 0x4000080 kqread syz-executor
47702 250497 78959 32767 3 0x10 0x4000080 fsleep syz-executor
39905 204638 10475 32767 2 0x10 0xc80 syz-executor
79470 13061 59285 32767 3 0x10 0x80 nanoslp syz-executor
57475 314064 6388 32767 3 0x10 0x80 nanoslp syz-executor
1222 361885 35016 32767 3 0x10 0 biowait syz-executor
78959 155463 37974 32767 3 0x10 0x80 nanoslp syz-executor
35881 413920 77725 32767 3 0x10 0 biowait syz-executor
35016 300113 24639 0 3 0x2 0x80 wait syz-executor
37974 109879 24639 0 3 0x2 0x80 wait syz-executor
77725 261068 24639 0 3 0x2 0x80 wait syz-executor
6388 13708 24639 0 3 0x2 0x80 wait syz-executor
59285 100846 24639 0 3 0x2 0x80 wait syz-executor
10475 358413 24639 0 3 0x2 0x80 wait syz-executor
24639 99576 52444 0 3 0x2 0x80 wait syz-executor
52444 414467 85587 0 3 0x100002 0x88 sigsusp ksh
85587 181177 45850 0 3 0x10 0x88 kqread sshd-session
45850 423245 92072 0 3 0x12 0x80 kqread sshd-session
39319 47902 1 0 3 0x100003 0x80 ttyin getty
92072 272968 1 0 3 0 0x88 kqread sshd
71443 349824 45430 73 3 0x1100010 0x80 kqread syslogd
45430 264619 1 0 3 0x100002 0x80 sbwait syslogd
24361 51929 1 0 3 0x100000 0x80 kqread resolvd
50044 26266 70812 77 3 0x100012 0x80 kqread dhcpleased
58297 261126 70812 77 3 0x100012 0x80 kqread dhcpleased
70812 248114 1 0 3 0 0x80 kqread dhcpleased
2026 277535 0 0 3 0x14000 0x200 bored smr
77710 169769 0 0 2 0x14000 0x200 zerothread
96997 162010 0 0 3 0x14000 0x200 aiodoned aiodoned
97811 254877 0 0 3 0x14000 0x200 syncer update
95056 339244 0 0 3 0x14000 0x200 cleaner cleaner
36935 81309 0 0 3 0x14000 0x200 reaper reaper
71476 524043 0 0 3 0x14000 0x200 pgdaemon pagedaemon
71020 414925 0 0 3 0x14000 0x200 bored viomb
79971 171614 0 0 3 0x14000 0x40000200 acpi0 acpi0
12437 298328 0 0 3 0x14000 0x40000200 idle1
41666 132449 0 0 3 0x14000 0x200 bored softnet1
52066 247024 0 0 3 0x14000 0x200 bored softnet0
14552 388787 0 0 3 0x14000 0x200 bored systqmp
83821 342565 0 0 3 0x14000 0x200 bored systq
65134 12983 0 0 3 0x14000 0x200 tmoslp softclockmp
54074 354315 0 0 3 0x14000 0x40000200 tmoslp softclock
29116 502892 0 0 3 0x14000 0x40000200 idle0
1 133722 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff8806d051110)
#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+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_page_remove+0xca rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_page_remove+0xca pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_page_remove+0xca sys/arch/amd64/amd64/pmap.c:1984
#3 uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
#4 amap_wipeout+0x1d6 sys/uvm/uvm_amap.c:-1
#5 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1359
#6 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
#7 exit1+0x71b sys/kern/kern_exit.c:260
#8 sys_exit+0x1a sys/kern/kern_exit.c:-1
#9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#10 Xsyscall+0x128
Process 10232 (syz-executor) thread 0xffff800045fe6d18 (49014)
shared rwlock uobjlk r = 0 (0xfffff8806e0a15e8)
#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 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1204
#3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffff8806d18cc90)
#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 1222 (syz-executor) thread 0xffff800045fee2b0 (361885)
exclusive rrwlock inode r = 0 (0xfffff8806f0ff488)
#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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3063
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff8806d739430)
#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:783
#9 Xsyscall+0x128
Process 35881 (syz-executor) thread 0xffff800045fef770 (413920)
exclusive rrwlock inode r = 0 (0xfffff8806f0ff800)
#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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3063
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff8806d98c1d8)
#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:783
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11054 12015K 12034K 166960K 12151 0
pcb 17 12K 12K 166960K 17 0
rtable 197 5K 7K 166960K 368 0
pf 27 16K 16K 166960K 31 0
ifaddr 34 6K 7K 166960K 44 0
ifgroup 42 1K 2K 166960K 50 0
sysctl 4 1K 9K 166960K 8 0
counters 66 36K 37K 166960K 70 0
ioctlops 0 0K 4K 166960K 44 0
iov 0 0K 8K 166960K 10 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1296 82K 82K 166960K 1607 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 33 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 15 0
dirhash 12 2K 2K 166960K 21 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 20 73K 129K 166960K 539 0
sigio 0 0K 0K 166960K 4 0
proc 58 99K 147K 166960K 568 0
subproc 63 3K 5K 166960K 243 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 46 0
in_multi 77 5K 7K 166960K 114 0
ether_multi 1 0K 0K 166960K 4 0
mrt 2 0K 0K 166960K 18 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 121 546K 546K 166960K 121 0
exec 0 0K 1K 166960K 415 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 216 175K 192K 166960K 6147 0
UVM aobj 30 4K 6K 166960K 45 0
pinsyscall 41 82K 112K 166960K 1639 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 17 0
NDP 9 0K 2K 166960K 27 0
temp 50 9122K 9130K 166960K 4824 0
kqueue 14 22K 24K 166960K 82 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 28 0 0 1 0 1 1 0 8 0
rtpcb 120 92 0 89 2 1 1 2 0 8 0
rtentry 176 115 0 25 6 0 6 6 0 8 0
unpcb 144 272 0 257 3 0 3 3 0 8 2
syncache 336 9 0 9 1 0 1 1 0 8 1
tcpcb 736 105 0 100 1 0 1 1 0 8 0
arp 136 18 0 4 1 0 1 1 0 8 0
ipq 40 1 0 0 1 0 1 1 0 8 0
ipqe 40 1 0 0 1 0 1 1 0 8 0
inpcb 328 313 0 303 2 0 2 2 0 8 1
nd6 152 28 0 8 1 0 1 1 0 8 0
kcovpl 48 27 0 20 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 497 0 105 30 2 28 30 0 8 1
art_table 40 498 0 105 5 0 5 5 0 8 0
art_node 32 115 0 33 1 0 1 1 0 8 0
sysvmsgpl 40 15 0 5 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 72 13 0 3 1 0 1 1 0 8 0
shmpl 112 42 0 15 1 0 1 1 0 8 0
dirhash 1024 23 0 6 3 0 3 3 0 8 0
dino2pl 256 2084 0 600 93 0 93 93 0 8 0
ffsino 296 2084 0 600 115 0 115 115 0 8 0
nchpl 144 2712 0 1001 64 0 64 64 0 8 0
vnodes 216 2336 0 0 130 0 130 130 0 8 0
namei 1024 8736 0 8734 1 0 1 1 0 8 0
percpumem 16 51 0 2 1 0 1 1 0 8 0
kstatmem 264 25 0 4 2 0 2 2 0 8 0
scxspl 216 9133 0 9131 6 3 3 3 1 8 2
plimitpl 152 184 0 161 2 1 1 2 0 8 0
sigapl 424 796 0 747 7 0 7 7 0 8 1
knotepl 120 325 0 0 10 0 10 10 0 8 0
kqueuepl 224 129 0 119 3 2 1 3 0 8 0
pipepl 344 213 0 186 4 0 4 4 0 8 1
fdescpl 528 780 0 748 4 1 3 4 0 8 0
filepl 160 3763 0 3569 14 3 11 13 0 8 2
lockfpl 104 88 0 85 1 0 1 1 0 8 0
lockfspl 48 37 0 34 1 0 1 1 0 8 0
sessionpl 144 66 0 51 1 0 1 1 0 8 0
pgrppl 48 95 0 72 1 0 1 1 0 8 0
ucredpl 104 728 0 711 1 0 1 1 0 8 0
zombiepl 144 748 0 747 1 0 1 1 0 8 0
processpl 1232 796 0 747 5 0 5 5 0 8 0
procpl 664 1315 0 1262 6 0 6 6 0 8 0
sosppl 176 2 0 2 2 1 1 1 0 8 1
sockpl 752 678 0 650 11 1 10 10 0 8 7
mcl64k 65536 6 0 0 1 0 1 1 0 8 0
mcl16k 16384 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 3 0 0 1 0 1 1 0 8 0
mcl9k128 9344 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 6 0 0 1 0 1 1 0 8 0
mcl4k 4096 130 0 0 17 0 17 17 0 8 0
mcl2k 2048 21 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 1200 0 0 75 0 75 75 0 8 0
bufpl 272 2848 0 104 183 0 183 183 0 8 0
anonpl 32 7770 0 0 63 0 63 63 0 247 0
amapchunkpl 152 20799 0 20375 38 7 31 38 0 158 10
amappl16 200 2957 0 2940 22 11 11 14 0 8 8
amappl15 192 10 0 10 1 1 0 1 0 8 0
amappl14 184 399 0 398 1 0 1 1 0 8 0
amappl13 176 124 0 114 1 0 1 1 0 8 0
amappl12 168 1014 0 985 2 0 2 2 0 8 0
amappl11 160 5 0 5 1 1 0 1 0 8 0
amappl10 152 67 0 57 1 0 1 1 0 8 0
amappl9 144 276 0 276 1 1 0 1 0 8 0
amappl8 136 95 0 94 1 0 1 1 0 8 0
amappl7 128 142 0 130 1 0 1 1 0 8 0
amappl6 120 147 0 145 1 0 1 1 0 8 0
amappl5 112 104 0 97 1 0 1 1 0 8 0
amappl4 104 275 0 257 1 0 1 1 0 8 0
amappl3 96 3283 0 3202 5 1 4 4 0 8 0
amappl2 88 928 0 856 2 0 2 2 0 8 0
amappl1 80 12901 0 12350 16 0 16 16 0 8 3
amappl 88 5359 0 5210 5 0 5 5 0 92 0
uvmvnodes 80 113 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 44 0 15 1 0 1 1 0 8 0
uaddrrnd 24 780 0 748 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 780 0 748 1 0 1 1 0 8 0
vmmpekpl 168 8981 0 8942 3 0 3 3 0 8 0
vmmpepl 168 59938 0 58115 105 5 100 105 0 357 11
vmsppl 488 779 0 747 7 2 5 6 0 8 0
rwobjpl 80 20096 0 19155 25 0 25 25 0 8 0
pdppl 4096 1567 0 1494 127 48 79 99 0 8 6
pvpl 32 17493 0 0 143 1 142 142 0 265 0
pmappl 256 779 0 747 4 1 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 545 0 53 15 0 15 15 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2024
uvm_anfree(fffff8806d518720) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffff880668c4a50) at amap_wipeout+0x1d6 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c3eb120,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1359
uvm_map_teardown(fffff8806d052028) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
exit1(ffff800045fe74e0,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260
sys_exit(ffff800045fe74e0,ffff80003c3eb2f0,ffff80003c3eb240) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c3eb2f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3eb2f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x72ed37c8bf80, count: -9
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff80002999dff0) 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(ffffffff83ab4500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83ab4500) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80002a33eef0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a33eef0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x921ee59cfe0, count: 9
ddb{1}> trace
x86_ipi_db(ffff80002999dff0) 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(ffffffff83ab4500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83ab4500) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80002a33eef0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a33eef0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x921ee59cfe0, count: -6
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: b56428e2942e limits.h: bump _POSIX_THREAD_THREADS_MAX to 64
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=157fd079580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=d1a7c2f053cf70b7120e
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c599fd2a78ed/disk-b56428e2.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/8961c52b02d7/bsd-b56428e2.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/50ca66f613de/kernel-b56428e2.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d1a7c2...@syzkaller.appspotmail.com
uvm_fault(0xfffff8806d052028, 0x7f87dd85b2e0, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
294792 10232 32767 0x10 0x4000000 1 syz-executor
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2024
uvm_anfree(fffff8806d518720) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffff880668c4a50) at amap_wipeout+0x1d6 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c3eb120,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1359
uvm_map_teardown(fffff8806d052028) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
exit1(ffff800045fe74e0,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260
sys_exit(ffff800045fe74e0,ffff80003c3eb2f0,ffff80003c3eb240) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c3eb2f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3eb2f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x72ed37c8bf80, count: 6
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
*cpu0: uvm_fault(0xfffff8806d052028, 0x7f87dd85b2e0, 0, 2) -> e
ddb{0}> show kasan
No such command
ddb{0}> trace
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2024
uvm_anfree(fffff8806d518720) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffff880668c4a50) at amap_wipeout+0x1d6 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c3eb120,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1359
uvm_map_teardown(fffff8806d052028) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
exit1(ffff800045fe74e0,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260
sys_exit(ffff800045fe74e0,ffff80003c3eb2f0,ffff80003c3eb240) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c3eb2f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3eb2f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x72ed37c8bf80, count: -9
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003c3eb020
rbx 0xfffff880616b1770
rdx 0
rcx 0x7f8000000000
rax 0
r8 0
r9 0xffff80003c3eb010
r10 0x3777bd85e42e3551
r11 0xf733982456ea8e8c
r12 0
r13 0
r14 0x7dd85b2e0
r15 0xfffff88008259020
rip 0xffffffff81d9c7ad pmap_page_remove+0x45d
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80003c3eafa0
ss 0x10
pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
ddb{0}> show proc
PROC (syz-executor) tid=203538 pid=95045 tcnt=0 stat=onproc
flags process=a<EXEC,EXITING> proc=2000<WEXIT>
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=1
forw=0xffffffffffffffff, list=0xffff800045fe67e8,0xffff800045fe7cb8
process=0xffff80003bfcc4f0 user=0xffff80003c3e6000, vmspace=0xfffff8806d052028
estcpu=36, cpticks=7, pctcpu=0.0, user=0, sys=2, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
26649 334119 79470 32767 2 0x10 0 syz-executor
57127 358902 77744 0 2 0 0 syz-executor
77744 443125 24639 0 3 0x2 0x80 wait syz-executor
10232 49014 39905 32767 2 0x10 0 syz-executor
10232 294792 39905 32767 7 0x10 0x4000000 syz-executor
74311 165128 57475 32767 2 0x10 0 syz-executor
74311 136823 57475 32767 2 0x10 0x4000000 syz-executor
47702 228369 78959 32767 3 0x10 0x80 nanoslp syz-executor
47702 403916 78959 32767 3 0x10 0x4000080 kqread syz-executor
47702 250497 78959 32767 3 0x10 0x4000080 fsleep syz-executor
39905 204638 10475 32767 2 0x10 0xc80 syz-executor
79470 13061 59285 32767 3 0x10 0x80 nanoslp syz-executor
57475 314064 6388 32767 3 0x10 0x80 nanoslp syz-executor
1222 361885 35016 32767 3 0x10 0 biowait syz-executor
78959 155463 37974 32767 3 0x10 0x80 nanoslp syz-executor
35881 413920 77725 32767 3 0x10 0 biowait syz-executor
35016 300113 24639 0 3 0x2 0x80 wait syz-executor
37974 109879 24639 0 3 0x2 0x80 wait syz-executor
77725 261068 24639 0 3 0x2 0x80 wait syz-executor
6388 13708 24639 0 3 0x2 0x80 wait syz-executor
59285 100846 24639 0 3 0x2 0x80 wait syz-executor
10475 358413 24639 0 3 0x2 0x80 wait syz-executor
24639 99576 52444 0 3 0x2 0x80 wait syz-executor
52444 414467 85587 0 3 0x100002 0x88 sigsusp ksh
85587 181177 45850 0 3 0x10 0x88 kqread sshd-session
45850 423245 92072 0 3 0x12 0x80 kqread sshd-session
39319 47902 1 0 3 0x100003 0x80 ttyin getty
92072 272968 1 0 3 0 0x88 kqread sshd
71443 349824 45430 73 3 0x1100010 0x80 kqread syslogd
45430 264619 1 0 3 0x100002 0x80 sbwait syslogd
24361 51929 1 0 3 0x100000 0x80 kqread resolvd
50044 26266 70812 77 3 0x100012 0x80 kqread dhcpleased
58297 261126 70812 77 3 0x100012 0x80 kqread dhcpleased
70812 248114 1 0 3 0 0x80 kqread dhcpleased
2026 277535 0 0 3 0x14000 0x200 bored smr
77710 169769 0 0 2 0x14000 0x200 zerothread
96997 162010 0 0 3 0x14000 0x200 aiodoned aiodoned
97811 254877 0 0 3 0x14000 0x200 syncer update
95056 339244 0 0 3 0x14000 0x200 cleaner cleaner
36935 81309 0 0 3 0x14000 0x200 reaper reaper
71476 524043 0 0 3 0x14000 0x200 pgdaemon pagedaemon
71020 414925 0 0 3 0x14000 0x200 bored viomb
79971 171614 0 0 3 0x14000 0x40000200 acpi0 acpi0
12437 298328 0 0 3 0x14000 0x40000200 idle1
41666 132449 0 0 3 0x14000 0x200 bored softnet1
52066 247024 0 0 3 0x14000 0x200 bored softnet0
14552 388787 0 0 3 0x14000 0x200 bored systqmp
83821 342565 0 0 3 0x14000 0x200 bored systq
65134 12983 0 0 3 0x14000 0x200 tmoslp softclockmp
54074 354315 0 0 3 0x14000 0x40000200 tmoslp softclock
29116 502892 0 0 3 0x14000 0x40000200 idle0
1 133722 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff8806d051110)
#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+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_page_remove+0xca rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_page_remove+0xca pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_page_remove+0xca sys/arch/amd64/amd64/pmap.c:1984
#3 uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
#4 amap_wipeout+0x1d6 sys/uvm/uvm_amap.c:-1
#5 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1359
#6 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
#7 exit1+0x71b sys/kern/kern_exit.c:260
#8 sys_exit+0x1a sys/kern/kern_exit.c:-1
#9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#10 Xsyscall+0x128
Process 10232 (syz-executor) thread 0xffff800045fe6d18 (49014)
shared rwlock uobjlk r = 0 (0xfffff8806e0a15e8)
#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 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1204
#3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffff8806d18cc90)
#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 1222 (syz-executor) thread 0xffff800045fee2b0 (361885)
exclusive rrwlock inode r = 0 (0xfffff8806f0ff488)
#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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3063
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff8806d739430)
#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:783
#9 Xsyscall+0x128
Process 35881 (syz-executor) thread 0xffff800045fef770 (413920)
exclusive rrwlock inode r = 0 (0xfffff8806f0ff800)
#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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3063
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff8806d98c1d8)
#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:783
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11054 12015K 12034K 166960K 12151 0
pcb 17 12K 12K 166960K 17 0
rtable 197 5K 7K 166960K 368 0
pf 27 16K 16K 166960K 31 0
ifaddr 34 6K 7K 166960K 44 0
ifgroup 42 1K 2K 166960K 50 0
sysctl 4 1K 9K 166960K 8 0
counters 66 36K 37K 166960K 70 0
ioctlops 0 0K 4K 166960K 44 0
iov 0 0K 8K 166960K 10 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1296 82K 82K 166960K 1607 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 33 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 15 0
dirhash 12 2K 2K 166960K 21 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 20 73K 129K 166960K 539 0
sigio 0 0K 0K 166960K 4 0
proc 58 99K 147K 166960K 568 0
subproc 63 3K 5K 166960K 243 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 46 0
in_multi 77 5K 7K 166960K 114 0
ether_multi 1 0K 0K 166960K 4 0
mrt 2 0K 0K 166960K 18 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 121 546K 546K 166960K 121 0
exec 0 0K 1K 166960K 415 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 216 175K 192K 166960K 6147 0
UVM aobj 30 4K 6K 166960K 45 0
pinsyscall 41 82K 112K 166960K 1639 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 17 0
NDP 9 0K 2K 166960K 27 0
temp 50 9122K 9130K 166960K 4824 0
kqueue 14 22K 24K 166960K 82 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 28 0 0 1 0 1 1 0 8 0
rtpcb 120 92 0 89 2 1 1 2 0 8 0
rtentry 176 115 0 25 6 0 6 6 0 8 0
unpcb 144 272 0 257 3 0 3 3 0 8 2
syncache 336 9 0 9 1 0 1 1 0 8 1
tcpcb 736 105 0 100 1 0 1 1 0 8 0
arp 136 18 0 4 1 0 1 1 0 8 0
ipq 40 1 0 0 1 0 1 1 0 8 0
ipqe 40 1 0 0 1 0 1 1 0 8 0
inpcb 328 313 0 303 2 0 2 2 0 8 1
nd6 152 28 0 8 1 0 1 1 0 8 0
kcovpl 48 27 0 20 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 497 0 105 30 2 28 30 0 8 1
art_table 40 498 0 105 5 0 5 5 0 8 0
art_node 32 115 0 33 1 0 1 1 0 8 0
sysvmsgpl 40 15 0 5 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 72 13 0 3 1 0 1 1 0 8 0
shmpl 112 42 0 15 1 0 1 1 0 8 0
dirhash 1024 23 0 6 3 0 3 3 0 8 0
dino2pl 256 2084 0 600 93 0 93 93 0 8 0
ffsino 296 2084 0 600 115 0 115 115 0 8 0
nchpl 144 2712 0 1001 64 0 64 64 0 8 0
vnodes 216 2336 0 0 130 0 130 130 0 8 0
namei 1024 8736 0 8734 1 0 1 1 0 8 0
percpumem 16 51 0 2 1 0 1 1 0 8 0
kstatmem 264 25 0 4 2 0 2 2 0 8 0
scxspl 216 9133 0 9131 6 3 3 3 1 8 2
plimitpl 152 184 0 161 2 1 1 2 0 8 0
sigapl 424 796 0 747 7 0 7 7 0 8 1
knotepl 120 325 0 0 10 0 10 10 0 8 0
kqueuepl 224 129 0 119 3 2 1 3 0 8 0
pipepl 344 213 0 186 4 0 4 4 0 8 1
fdescpl 528 780 0 748 4 1 3 4 0 8 0
filepl 160 3763 0 3569 14 3 11 13 0 8 2
lockfpl 104 88 0 85 1 0 1 1 0 8 0
lockfspl 48 37 0 34 1 0 1 1 0 8 0
sessionpl 144 66 0 51 1 0 1 1 0 8 0
pgrppl 48 95 0 72 1 0 1 1 0 8 0
ucredpl 104 728 0 711 1 0 1 1 0 8 0
zombiepl 144 748 0 747 1 0 1 1 0 8 0
processpl 1232 796 0 747 5 0 5 5 0 8 0
procpl 664 1315 0 1262 6 0 6 6 0 8 0
sosppl 176 2 0 2 2 1 1 1 0 8 1
sockpl 752 678 0 650 11 1 10 10 0 8 7
mcl64k 65536 6 0 0 1 0 1 1 0 8 0
mcl16k 16384 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 3 0 0 1 0 1 1 0 8 0
mcl9k128 9344 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 6 0 0 1 0 1 1 0 8 0
mcl4k 4096 130 0 0 17 0 17 17 0 8 0
mcl2k 2048 21 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 1200 0 0 75 0 75 75 0 8 0
bufpl 272 2848 0 104 183 0 183 183 0 8 0
anonpl 32 7770 0 0 63 0 63 63 0 247 0
amapchunkpl 152 20799 0 20375 38 7 31 38 0 158 10
amappl16 200 2957 0 2940 22 11 11 14 0 8 8
amappl15 192 10 0 10 1 1 0 1 0 8 0
amappl14 184 399 0 398 1 0 1 1 0 8 0
amappl13 176 124 0 114 1 0 1 1 0 8 0
amappl12 168 1014 0 985 2 0 2 2 0 8 0
amappl11 160 5 0 5 1 1 0 1 0 8 0
amappl10 152 67 0 57 1 0 1 1 0 8 0
amappl9 144 276 0 276 1 1 0 1 0 8 0
amappl8 136 95 0 94 1 0 1 1 0 8 0
amappl7 128 142 0 130 1 0 1 1 0 8 0
amappl6 120 147 0 145 1 0 1 1 0 8 0
amappl5 112 104 0 97 1 0 1 1 0 8 0
amappl4 104 275 0 257 1 0 1 1 0 8 0
amappl3 96 3283 0 3202 5 1 4 4 0 8 0
amappl2 88 928 0 856 2 0 2 2 0 8 0
amappl1 80 12901 0 12350 16 0 16 16 0 8 3
amappl 88 5359 0 5210 5 0 5 5 0 92 0
uvmvnodes 80 113 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 44 0 15 1 0 1 1 0 8 0
uaddrrnd 24 780 0 748 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 780 0 748 1 0 1 1 0 8 0
vmmpekpl 168 8981 0 8942 3 0 3 3 0 8 0
vmmpepl 168 59938 0 58115 105 5 100 105 0 357 11
vmsppl 488 779 0 747 7 2 5 6 0 8 0
rwobjpl 80 20096 0 19155 25 0 25 25 0 8 0
pdppl 4096 1567 0 1494 127 48 79 99 0 8 6
pvpl 32 17493 0 0 143 1 142 142 0 265 0
pmappl 256 779 0 747 4 1 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 545 0 53 15 0 15 15 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffff88008258fb8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2024
uvm_anfree(fffff8806d518720) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffff880668c4a50) at amap_wipeout+0x1d6 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c3eb120,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1359
uvm_map_teardown(fffff8806d052028) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
exit1(ffff800045fe74e0,43,0,1) at exit1+0x71b sys/kern/kern_exit.c:260
sys_exit(ffff800045fe74e0,ffff80003c3eb2f0,ffff80003c3eb240) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c3eb2f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3eb2f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x72ed37c8bf80, count: -9
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff80002999dff0) 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(ffffffff83ab4500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83ab4500) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80002a33eef0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a33eef0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x921ee59cfe0, count: 9
ddb{1}> trace
x86_ipi_db(ffff80002999dff0) 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(ffffffff83ab4500) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83ab4500) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80002a33eef0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a33eef0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x921ee59cfe0, count: -6
---
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