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: 583d, last: 42d
Sample crash report:
*cpu1: uvm_fault(0xfffffb806cee99a0, 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: 0x7d1e102cbed0, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003c407000
rbx 0
rdx 0
rcx 0xffff80003aba6d20
rax 0x2a
r8 0xffff80003c406f30
r9 0x4
r10 0x2571cd2c67e7e93b
r11 0x7cda26a7cfe0bc1c
r12 0
r13 0
r14 0
r15 0
rip 0xffffffff826b94c7 proc_trampoline+0xc7
cs 0x8
rflags 0x246
rsp 0xffff80003c406f80
ss 0
proc_trampoline+0xc7: movl $0,%gs:0x688
ddb{0}> show proc
PROC (sh) tid=264066 pid=23907 tcnt=1 stat=onproc
flags process=100000<PLEDGE> proc=0
runpri=86, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003aba7780,0xffffffff83a54c08
process=0xffff80003aba8e90 user=0xffff80003c402000, vmspace=0xfffffb806cd165d8
estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
*23907 264066 58490 0 7 0x100000 0 sh
58490 57754 79004 0 3 0x100002 0x88 sigsusp sh
38609 75207 92311 0 2 0x100000 0 sh
92311 251505 98809 0 3 0x100002 0x88 sigsusp sh
83893 247131 27002 0 2 0 0 syz-executor
83893 416090 27002 0 3 0 0x4000080 lockf syz-executor
83893 23881 27002 0 3 0 0x4000080 fsleep syz-executor
83893 523689 27002 0 3 0 0x4000080 fsleep syz-executor
84464 415044 79970 60929 2 0x10 0 syz-executor
84464 282256 79970 60929 3 0x10 0x4000080 fsleep syz-executor
83626 337652 1646 0 2 0x100002 0 ndp
1646 426018 93556 0 3 0x100002 0x88 sigsusp sh
28594 106203 8329 0 2 0 0 syz-executor
28594 160008 8329 0 7 0 0x4000000 syz-executor
28594 64451 8329 0 3 0 0x4000080 fsleep syz-executor
43019 82751 59251 0 2 0 0 syz-executor
43019 364614 59251 0 3 0 0x4000080 fsleep syz-executor
73141 53205 71115 -1 3 0x10 0x80 nanoslp syz-executor
73141 11261 71115 -1 3 0x10 0x4000080 lockf syz-executor
73141 283437 71115 -1 3 0x10 0x4000080 lockf syz-executor
73141 442564 71115 -1 3 0x10 0x4000080 fsleep syz-executor
79970 203811 53904 0 3 0x2 0x80 nanoslp syz-executor
79004 206938 53904 0 3 0x2 0x80 wait syz-executor
93556 383903 53904 0 3 0x2 0x80 wait syz-executor
27002 146593 53904 0 3 0x2 0x80 nanoslp syz-executor
8329 88743 53904 0 3 0x2 0x80 nanoslp syz-executor
71115 114142 53904 0 3 0x2 0x80 nanoslp syz-executor
98809 203978 53904 0 3 0x2 0x80 wait syz-executor
59251 27823 53904 0 3 0x2 0x80 nanoslp syz-executor
53904 187721 68032 0 3 0x2 0x80 kqread syz-executor
68032 253697 58446 0 3 0x100002 0x88 sigsusp ksh
58446 163008 35581 0 3 0x10 0x88 kqread sshd-session
35581 329884 51010 0 3 0x12 0x80 kqread sshd-session
7529 201097 1 0 3 0x100003 0x80 ttyin getty
51010 241466 1 0 3 0 0x88 kqread sshd
32881 228570 19045 74 3 0x1100012 0x80 bpf pflogd
19045 505971 1 0 3 0 0x80 sbwait pflogd
8762 279743 33485 73 3 0x1100010 0x80 kqread syslogd
33485 394609 1 0 3 0x100002 0x80 sbwait syslogd
37655 277886 1 0 3 0x100000 0x80 kqread resolvd
16767 62823 99379 77 3 0x100012 0x80 kqread dhcpleased
91617 93298 99379 77 3 0x100012 0x80 kqread dhcpleased
99379 18247 1 0 3 0 0x80 kqread dhcpleased
93300 453592 0 0 3 0x14000 0x200 bored smr
53851 203996 0 0 2 0x14000 0x200 zerothread
41410 317121 0 0 3 0x14000 0x200 aiodoned aiodoned
31462 415765 0 0 3 0x14000 0x200 syncer update
77578 24778 0 0 3 0x14000 0x200 cleaner cleaner
79280 453851 0 0 3 0x14000 0x200 reaper reaper
46738 512239 0 0 3 0x14000 0x200 pgdaemon pagedaemon
69880 358571 0 0 3 0x14000 0x200 bored viomb
19975 341151 0 0 3 0x14000 0x40000200 acpi0 acpi0
34596 504220 0 0 3 0x14000 0x40000200 idle1
18165 10153 0 0 3 0x14000 0x200 bored softnet1
91770 78688 0 0 3 0x14000 0x200 bored softnet0
87112 356465 0 0 3 0x14000 0x200 smrbar systqmp
48032 163919 0 0 3 0x14000 0x200 bored systq
68264 108763 0 0 3 0x14000 0x200 tmoslp softclockmp
60732 84841 0 0 3 0x14000 0x40000200 tmoslp softclock
35774 478555 0 0 3 0x14000 0x40000200 idle0
1 132028 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 (0xfffffb806cd15b10)
#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_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2777
#3 uvm_fault_lower_lookup+0x369 sys/uvm/uvm_fault.c:-1
#4 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#5 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#7 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#8 recall_trap+0x8
Process 23907 (sh) thread 0xffff80003aba6d20 (264066)
shared rwlock uobjlk r = 0 (0xfffffb80789ef518)
#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 (0xfffffb806cd166d8)
#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 &pmap->pm_mtx r = 0 (0xfffffb806cd15b10)
#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_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2777
#3 uvm_fault_lower_lookup+0x369 sys/uvm/uvm_fault.c:-1
#4 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#5 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#7 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#8 recall_trap+0x8
Process 28594 (syz-executor) thread 0xffff80003bfb9778 (160008)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a7a440)
#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 87112 (systqmp) thread 0xffff800045ffe7c8 (356465)
shared rwlock systqmp r = 0 (0xffffffff839acfd8)
#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 11053 12093K 12098K 166960K 12145 0
pcb 19 12K 13K 166960K 28 0
rtable 217 6K 6K 166960K 321 0
pf 34 17K 18K 166960K 45 0
ifaddr 41 7K 7K 166960K 43 0
ifgroup 55 2K 2K 166960K 55 0
sysctl 1 1K 9K 166960K 5 0
counters 70 37K 37K 166960K 70 0
ioctlops 0 0K 4K 166960K 1482 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1290 81K 81K 166960K 1358 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 1K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 3 0K 0K 166960K 3 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 21 77K 85K 166960K 134 0
proc 71 115K 164K 166960K 546 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
in_multi 89 6K 6K 166960K 89 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 31 148K 148K 166960K 31 0
exec 0 0K 1K 166960K 385 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 245 178K 183K 166960K 3133 0
UVM aobj 3 2K 2K 166960K 3 0
pinsyscall 47 94K 100K 166960K 1305 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 26 1K 1K 166960K 26 0
temp 34 9114K 9120K 166960K 3860 0
kqueue 20 29K 29K 166960K 32 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 33 0 29 1 0 1 1 0 8 0
rtentry 176 101 0 1 5 0 5 5 0 8 0
unpcb 144 47 0 24 1 0 1 1 0 8 0
syncache 336 4 0 4 1 0 1 1 0 8 1
tcpcb 736 9 0 5 1 0 1 1 0 8 0
arp 136 17 0 0 1 0 1 1 0 8 0
inpcb 328 72 0 60 2 0 2 2 0 8 1
nd6 152 19 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 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
pfstitem 24 18 0 0 1 0 1 1 0 8 0
pfstkey 128 18 0 0 1 0 1 1 0 8 0
pfstate 448 18 0 0 2 0 2 2 0 8 0
pfrule 1360 21 0 15 2 0 2 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 410 0 0 26 0 26 26 0 8 0
art_table 40 411 0 0 5 0 5 5 0 8 0
art_node 32 101 0 9 1 0 1 1 0 8 0
semapl 72 1 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1565 0 99 92 0 92 92 0 8 0
ffsino 296 1565 0 99 113 0 113 113 0 8 0
nchpl 144 1766 0 68 64 0 64 64 0 8 0
vnodes 216 1652 0 0 92 0 92 92 0 8 0
namei 1024 5430 0 5430 1 0 1 1 0 8 1
percpumem 16 51 0 0 1 0 1 1 0 8 0
kstatmem 264 27 0 0 2 0 2 2 0 8 0
scxspl 216 6143 0 6143 4 1 3 3 1 8 3
plimitpl 152 29 0 12 1 0 1 1 0 8 0
sigapl 424 460 0 409 6 0 6 6 0 8 0
knotepl 120 248 0 0 8 0 8 8 0 8 0
kqueuepl 224 25 0 12 1 0 1 1 0 8 0
pipepl 344 129 0 102 3 0 3 3 0 8 0
fdescpl 528 444 0 409 3 0 3 3 0 8 0
filepl 160 1594 0 1366 10 0 10 10 0 8 0
lockfpl 104 11 0 4 1 0 1 1 0 8 0
lockfspl 48 6 0 2 1 0 1 1 0 8 0
sessionpl 144 24 0 15 1 0 1 1 0 8 0
pgrppl 48 32 0 15 1 0 1 1 0 8 0
ucredpl 104 89 0 73 1 0 1 1 0 8 0
zombiepl 144 409 0 409 1 0 1 1 0 8 1
processpl 1232 460 0 409 5 0 5 5 0 8 0
procpl 664 476 0 415 6 0 6 6 0 8 0
sockpl 752 160 0 121 5 0 5 5 0 8 1
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 124 0 0 16 0 16 16 0 8 0
mcl2k 2048 19 0 0 3 0 3 3 0 8 0
mextrefs 64 15 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 123 0 0 8 0 8 8 0 8 0
bufpl 272 2279 0 105 145 0 145 145 0 8 0
anonpl 32 3705 0 0 30 0 30 30 0 247 0
amapchunkpl 152 8332 0 7848 19 0 19 19 0 158 0
amappl16 200 1521 0 1507 5 0 5 5 0 8 4
amappl15 192 3 0 3 1 0 1 1 0 8 1
amappl14 184 434 0 429 1 0 1 1 0 8 0
amappl13 176 125 0 112 1 0 1 1 0 8 0
amappl12 168 692 0 661 2 0 2 2 0 8 0
amappl11 160 2 0 2 1 0 1 1 0 8 1
amappl10 152 64 0 49 1 0 1 1 0 8 0
amappl9 144 273 0 273 1 0 1 1 0 8 1
amappl8 136 99 0 98 1 0 1 1 0 8 0
amappl7 128 148 0 134 1 0 1 1 0 8 0
amappl6 120 155 0 150 1 0 1 1 0 8 0
amappl5 112 100 0 90 1 0 1 1 0 8 0
amappl4 104 313 0 294 1 0 1 1 0 8 0
amappl3 96 1436 0 1339 3 0 3 3 0 8 0
amappl2 88 635 0 562 2 0 2 2 0 8 0
amappl1 80 10444 0 9800 15 0 15 15 0 8 1
amappl 88 2403 0 2239 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 444 0 409 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 444 0 409 1 0 1 1 0 8 0
vmmpekpl 168 5692 0 5663 2 0 2 2 0 8 0
vmmpepl 168 37636 0 35670 86 0 86 86 0 357 0
vmsppl 488 443 0 409 5 0 5 5 0 8 0
rwobjpl 80 14256 0 13191 23 0 23 23 0 8 1
pdppl 4096 895 0 818 97 16 81 81 0 8 4
pvpl 32 9987 0 0 81 0 81 81 0 265 0
pmappl 256 443 0 409 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 405 0 18 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: 0x7d1e102cbed0, 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670
comcnputc(800,20) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline]
comcnputc(800,20) at comcnputc+0x250 sys/dev/ic/com.c:1274
cnputc(20) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(65) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline]
db_putchar(65) at db_putchar+0x126 sys/ddb/db_output.c:153
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83462089) at db_printf+0x9b sys/kern/subr_prf.c:-1
fault(ffffffff83523e11) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161
kpageflttrap(ffff80003c3d1710,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296
kerntrap(ffff80003c3d1710) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80003bfb9778,fffffb806cdcd5e8,ffff80003c3d18d0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691
end trace frame: 0xffff80003c3d1940, 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670
comcnputc(800,20) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline]
comcnputc(800,20) at comcnputc+0x250 sys/dev/ic/com.c:1274
cnputc(20) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(65) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline]
db_putchar(65) at db_putchar+0x126 sys/ddb/db_output.c:153
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83462089) at db_printf+0x9b sys/kern/subr_prf.c:-1
fault(ffffffff83523e11) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161
kpageflttrap(ffff80003c3d1710,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296
kerntrap(ffff80003c3d1710) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80003bfb9778,fffffb806cdcd5e8,ffff80003c3d18d0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691
sys_futimens(ffff80003bfb9778,ffff80003c3d1a20,ffff80003c3d1970) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767
syscall(ffff80003c3d1a20) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3d1a20) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x571cac64630, count: -17
Struck through repros no longer work on HEAD.