syzbot
uvm_fault: x86_ipi_db (9)
Status:
upstream: reported on 2025/02/14 23:55
Reported-by: syzbot+a157c6e0d81b4f6b71a4@syzkaller.appspotmail.com
First crash: 531d, last: 52m
Sample crash report:
*cpu1: uvm_fault(0xfffff3006cd28208, 0x98, 0, 1) -> e
ddb{0}> show kasan
No such command
ddb{0}> trace
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x7b52ff27e510, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003c3ff360
rbx 0
rdx 0
rcx 0xffff80003c3bd778
rax 0x2a
r8 0xffff80003c3ff290
r9 0xe79b1602001
r10 0xd4765124a1d1b91d
r11 0xafd1a701f0d3f432
r12 0
r13 0
r14 0
r15 0
rip 0xffffffff819124c7 proc_trampoline+0xc7
cs 0x8
rflags 0x246
rsp 0xffff80003c3ff2e0
ss 0
proc_trampoline+0xc7: movl $0,%gs:0x688
ddb{0}> show proc
PROC (syz-executor) tid=24353 pid=11492 tcnt=1 stat=onproc
flags process=0 proc=0
runpri=50, usrpri=50, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003c3bcd18,0xffff80003c3bd4f0
process=0xffff80003c3d9360 user=0xffff80003c3fa000, vmspace=0xfffff3006cd28020
estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
*11492 24353 25320 0 7 0 0 syz-executor
81314 438542 88429 0 2 0 0 syz-executor
81314 167295 88429 0 7 0 0x4000000 syz-executor
46528 500669 27699 0 2 0 0 syz-executor
46528 14756 27699 0 3 0 0x4000080 kqread syz-executor
93717 444522 19999 60929 3 0x10 0x80 nanoslp syz-executor
93717 180486 19999 60929 3 0x10 0x4000080 msgwait syz-executor
93717 284839 19999 60929 3 0x10 0x4000080 fsleep syz-executor
33908 114158 33080 0 3 0 0x80 nanoslp syz-executor
33908 343345 33080 0 3 0 0x4000080 fifow syz-executor
33908 234683 33080 0 3 0 0x4000080 fsleep syz-executor
63532 354139 5336 0 3 0 0x80 nanoslp syz-executor
63532 311496 5336 0 3 0 0x4000080 ttyin syz-executor
63532 27969 5336 0 3 0 0x4000080 fsleep syz-executor
4477 29666 45789 0 3 0 0x80 nanoslp syz-executor
4477 109258 45789 0 3 0 0x4000080 netcon syz-executor
4477 508369 45789 0 3 0 0x4000080 fsleep syz-executor
30264 95794 78365 0 3 0x100002 0x80 sbwait arp
78365 363438 31183 0 3 0x100002 0x88 sigsusp sh
5336 43814 12489 0 3 0x2 0x80 nanoslp syz-executor
25320 476489 12489 0 3 0x2 0x80 nanoslp syz-executor
19999 339861 12489 0 3 0x2 0x80 nanoslp syz-executor
33080 417415 12489 0 3 0x2 0x80 nanoslp syz-executor
31183 419001 12489 0 3 0x2 0x80 wait syz-executor
27699 361100 12489 0 3 0x2 0x80 nanoslp syz-executor
45789 480535 12489 0 3 0x2 0x80 nanoslp syz-executor
88429 282383 12489 0 3 0x2 0x80 nanoslp syz-executor
12489 35012 962 0 3 0x2 0x80 kqread syz-executor
962 25704 85401 0 3 0x100002 0x88 sigsusp ksh
85401 412807 63973 0 3 0x10 0x88 kqread sshd-session
63973 75384 40193 0 3 0x12 0x80 kqread sshd-session
70778 359826 1 0 3 0x100003 0x80 ttyin getty
40193 92424 1 0 3 0 0x88 kqread sshd
28844 118904 8753 74 3 0x1100012 0x80 bpf pflogd
8753 468071 1 0 3 0 0x80 sbwait pflogd
35240 235731 64496 73 3 0x1100010 0x80 kqread syslogd
64496 510497 1 0 3 0x100002 0x80 sbwait syslogd
15712 135042 1 0 3 0x100000 0x80 kqread resolvd
16066 205027 81968 77 3 0x100012 0x80 kqread dhcpleased
54832 370302 81968 77 3 0x100012 0x80 kqread dhcpleased
81968 378906 1 0 3 0 0x80 kqread dhcpleased
50846 315108 0 0 3 0x14000 0x200 bored smr
75073 346438 0 0 3 0x14000 0x200 pgzero zerothread
71902 12869 0 0 3 0x14000 0x200 aiodoned aiodoned
10263 472235 0 0 3 0x14000 0x200 syncer update
91761 28431 0 0 3 0x14000 0x200 cleaner cleaner
89063 286412 0 0 3 0x14000 0x200 reaper reaper
5250 420591 0 0 3 0x14000 0x200 pgdaemon pagedaemon
4685 136704 0 0 3 0x14000 0x200 bored viomb
69230 453730 0 0 3 0x14000 0x40000200 acpi0 acpi0
30933 428809 0 0 3 0x14000 0x40000200 idle1
54742 344537 0 0 3 0x14000 0x200 bored softnet1
24835 357074 0 0 3 0x14000 0x200 bored softnet0
74304 504183 0 0 3 0x14000 0x200 smrbar systqmp
76076 89 0 0 3 0x14000 0x200 bored systq
25144 192807 0 0 3 0x14000 0x200 tmoslp softclockmp
21449 433979 0 0 3 0x14000 0x40000200 tmoslp softclock
94355 262173 0 0 3 0x14000 0x40000200 idle0
1 38576 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 rwobjpl r = 0 (0xffffffff83abed18)
#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 pool_get+0x124 sys/kern/subr_pool.c:585
#3 _rw_obj_alloc_flags+0x4d sys/kern/kern_rwlock.c:713
#4 amap_alloc+0xd6 sys/uvm/uvm_amap.c:-1
#5 amap_copy+0x6ac sys/uvm/uvm_amap.c:567
#6 uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747
#7 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#8 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#9 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#10 recall_trap+0x8
Process 11492 (syz-executor) thread 0xffff80003c3bd778 (24353)
exclusive rwlock vmmaplk r = 0 (0xfffff3006cd28120)
#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
exclusive mutex rwobjpl r = 0 (0xffffffff83abed18)
#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 pool_get+0x124 sys/kern/subr_pool.c:585
#3 _rw_obj_alloc_flags+0x4d sys/kern/kern_rwlock.c:713
#4 amap_alloc+0xd6 sys/uvm/uvm_amap.c:-1
#5 amap_copy+0x6ac sys/uvm/uvm_amap.c:567
#6 uvm_fault_check+0x473 sys/uvm/uvm_fault.c:747
#7 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#8 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#9 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#10 recall_trap+0x8
Process 81314 (syz-executor) thread 0xffff80003c3bd4e0 (167295)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a114c0)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
#1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
#2 Xsyscall+0x128
Process 74304 (systqmp) thread 0xffff800045ffe298 (504183)
shared rwlock systqmp r = 0 (0xffffffff839acd08)
#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 11062 12151K 12154K 166960K 12183 0
pcb 18 12K 12K 166960K 33 0
rtable 236 7K 7K 166960K 362 0
pf 37 18K 22K 166960K 68 0
ifaddr 42 7K 7K 166960K 48 0
ifgroup 55 2K 2K 166960K 64 0
sysctl 3 1K 9K 166960K 7 0
counters 70 37K 37K 166960K 82 0
ioctlops 0 0K 4K 166960K 1507 0
iov 0 0K 8K 166960K 2 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1296 81K 82K 166960K 1402 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 11 0K 0K 166960K 11 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 19 69K 89K 166960K 180 0
proc 74 131K 163K 166960K 553 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 8 0
in_multi 93 6K 6K 166960K 101 0
ether_multi 1 0K 0K 166960K 3 0
mrt 1 0K 0K 166960K 2 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 73 334K 334K 166960K 73 0
exec 0 0K 1K 166960K 389 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 239 176K 184K 166960K 3519 0
UVM aobj 3 2K 2K 166960K 4 0
pinsyscall 45 90K 104K 166960K 1357 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 2 0
NDP 14 0K 1K 166960K 29 0
temp 39 9115K 9120K 166960K 4023 0
kqueue 14 22K 24K 166960K 39 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 39 0 35 1 0 1 1 0 8 0
rtentry 176 107 0 2 5 0 5 5 0 8 0
unpcb 144 65 0 46 1 0 1 1 0 8 0
syncache 336 5 0 5 1 0 1 1 0 8 1
tcpcb 736 21 0 16 1 0 1 1 0 8 0
arp 136 17 0 0 1 0 1 1 0 8 0
inpcb 328 113 0 102 2 0 2 2 0 8 0
nd6 152 23 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1192 5 0 5 1 0 1 1 0 8 1
pppxif 1576 1 0 1 1 0 1 1 0 8 1
pfstscr 40 5 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
pfsrclim 320 1 0 1 1 0 1 1 0 8 1
pfanchor 1288 1 0 0 1 0 1 1 0 8 0
pftag 88 2 0 0 1 0 1 1 0 8 0
pfstitem 24 29 0 0 1 0 1 1 0 8 0
pfstkey 128 31 0 2 1 0 1 1 0 8 0
pfstate 448 28 0 1 4 0 4 4 0 8 0
pfrule 1360 24 0 17 2 0 2 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 430 0 6 27 0 27 27 0 8 0
art_table 40 431 0 6 5 0 5 5 0 8 0
art_node 32 107 0 10 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 72 9 0 0 1 0 1 1 0 8 0
shmpl 112 1 0 1 1 0 1 1 0 8 1
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1645 0 175 93 0 93 93 0 8 0
ffsino 296 1645 0 175 114 0 114 114 0 8 0
nchpl 144 1900 0 199 64 0 64 64 0 8 0
vnodes 216 1759 0 0 98 0 98 98 0 8 0
namei 1024 5826 0 5826 2 0 2 2 0 8 2
percpumem 16 57 0 6 1 0 1 1 0 8 0
kstatmem 264 33 0 6 3 0 3 3 0 8 1
scxspl 216 6462 0 6462 4 2 2 3 1 8 2
plimitpl 152 36 0 18 1 0 1 1 0 8 0
sigapl 424 506 0 457 7 0 7 7 0 8 0
knotepl 120 64 0 0 2 0 2 2 0 8 0
kqueuepl 224 44 0 34 1 0 1 1 0 8 0
pipepl 344 131 0 104 3 0 3 3 0 8 0
fdescpl 528 490 0 457 3 0 3 3 0 8 0
filepl 160 1836 0 1618 11 0 11 11 0 8 1
lockfpl 104 31 0 29 1 0 1 1 0 8 0
lockfspl 48 16 0 14 1 0 1 1 0 8 0
sessionpl 144 25 0 16 1 0 1 1 0 8 0
pgrppl 48 34 0 17 1 0 1 1 0 8 0
ucredpl 104 148 0 134 1 0 1 1 0 8 0
zombiepl 144 457 0 457 1 0 1 1 0 8 1
processpl 1232 506 0 457 5 0 5 5 0 8 0
procpl 664 568 0 509 6 0 6 6 0 8 0
sockpl 752 218 0 184 5 0 5 5 0 8 0
mcl64k 65536 9 0 0 2 0 2 2 0 8 0
mcl16k 16384 8 0 0 1 0 1 1 0 8 0
mcl12k 12288 5 0 0 1 0 1 1 0 8 0
mcl9k128 9344 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 135 0 0 17 0 17 17 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 20 0 0 3 0 3 3 0 8 0
mextrefs 64 20 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 187 0 0 12 0 12 12 0 8 0
bufpl 272 2354 0 105 150 0 150 150 0 8 0
anonpl 32 5545 0 0 45 0 45 45 0 247 0
amapchunkpl 152 9281 0 8801 26 0 26 26 0 158 7
amappl16 200 665 0 647 3 0 3 3 0 8 2
amappl15 192 25 0 25 1 0 1 1 0 8 1
amappl14 184 446 0 444 1 0 1 1 0 8 0
amappl13 176 133 0 120 1 0 1 1 0 8 0
amappl12 168 746 0 714 2 0 2 2 0 8 0
amappl11 160 38 0 37 1 0 1 1 0 8 0
amappl10 152 62 0 48 1 0 1 1 0 8 0
amappl9 144 291 0 291 1 0 1 1 0 8 1
amappl8 136 110 0 108 1 0 1 1 0 8 0
amappl7 128 146 0 132 1 0 1 1 0 8 0
amappl6 120 153 0 150 1 0 1 1 0 8 0
amappl5 112 95 0 85 1 0 1 1 0 8 0
amappl4 104 297 0 277 1 0 1 1 0 8 0
amappl3 96 1771 0 1655 4 0 4 4 0 8 0
amappl2 88 559 0 494 2 0 2 2 0 8 0
amappl1 80 10648 0 10013 15 0 15 15 0 8 0
amappl 88 2773 0 2611 4 0 4 4 0 92 0
uvmvnodes 80 98 0 0 2 0 2 2 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 1 1 0 1 1 0 8 0
uaddrrnd 24 490 0 457 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 490 0 457 1 0 1 1 0 8 0
vmmpekpl 168 5981 0 5947 2 0 2 2 0 8 0
vmmpepl 168 39463 0 37490 88 0 88 88 0 357 2
vmsppl 488 489 0 457 5 0 5 5 0 8 0
rwobjpl 80 13853 0 12792 24 0 24 24 0 8 1
pdppl 4096 987 0 914 97 22 75 83 0 8 2
pvpl 32 14150 0 0 115 0 115 115 0 265 0
pmappl 256 489 0 457 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 423 0 24 12 0 12 12 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x7b52ff27e510, count: -1
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
x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682
acpitimer_delay(1) at acpitimer_delay+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline]
acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120
comcnputc(800,20) at comcnputc+0x29b sys/dev/ic/com.c:1274
cnputc(20) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(2d) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline]
db_putchar(2d) at db_putchar+0x126 sys/ddb/db_output.c:153
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff8345da5f) at db_printf+0x9b sys/kern/subr_prf.c:-1
fault(ffffffff8351ede8) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161
kpageflttrap(ffff80003c3d5990,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296
kerntrap(ffff80003c3d5990) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
end trace frame: 0xffff80003c3d5b40, count: 0
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
x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682
acpitimer_delay(1) at acpitimer_delay+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline]
acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120
comcnputc(800,20) at comcnputc+0x29b sys/dev/ic/com.c:1274
cnputc(20) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(2d) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline]
db_putchar(2d) at db_putchar+0x126 sys/ddb/db_output.c:153
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff8345da5f) at db_printf+0x9b sys/kern/subr_prf.c:-1
fault(ffffffff8351ede8) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161
kpageflttrap(ffff80003c3d5990,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296
kerntrap(ffff80003c3d5990) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80003c3bd4e0,fffff3006044c1e0,ffff80003c3d5b50) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691
sys_futimens(ffff80003c3bd4e0,ffff80003c3d5ca0,ffff80003c3d5bf0) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767
syscall(ffff80003c3d5ca0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3d5ca0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xeb660215000, count: -18
Struck through repros no longer work on HEAD.