syzbot
uvm_fault: sys_shmat (3)
Status:
upstream: reported on 2026/06/24 23:01
Reported-by: syzbot+f5d2ec16c4993e11ed9e@syzkaller.appspotmail.com
First crash: 60d, last: 15h15m
Sample crash report:
uvm_fault(0xfffff2806cf10200, 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
*333021 65847 0 0 0x4000000 1 syz-executor
498781 73069 0 0x2 0 0 syz-executor
sys_shmat(ffff800039fa34e8,ffff80003c3e5630,ffff80003c3e5580) at sys_shmat+0x453 sys/kern/sysv_shm.c:290
syscall(ffff80003c3e5630) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3e5630) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6f08a4a7520, 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(0xfffff2806cf10200, 0x0, 0, 1) -> e
ddb{1}> show kasan
No such command
ddb{1}> trace
sys_shmat(ffff800039fa34e8,ffff80003c3e5630,ffff80003c3e5580) at sys_shmat+0x453 sys/kern/sysv_shm.c:290
syscall(ffff80003c3e5630) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3e5630) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6f08a4a7520, count: -3
ddb{1}> show registers
rdi 0xffff800030f87000
rsi 0x210
rbp 0xffff80003c3e5550
rbx 0xfffff2805f077ee0
rdx 0xffff800030f87000
rcx 0
rax 0
r8 0x100
r9 0xfffff280097fd478
r10 0
r11 0x4d23da2e44fb8a92
r12 0xffff800039fa34e8
r13 0xffff80000160e010
r14 0x1
r15 0
rip 0xffffffff82df9f43 sys_shmat+0x453
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80003c3e54c0
ss 0
sys_shmat+0x453: movq 0(%r15),%rdi
ddb{1}> show proc
PROC (syz-executor) tid=333021 pid=65847 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=56, usrpri=57, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800039fa2558,0xffff800045ff34e8
process=0xffff80003c3d3510 user=0xffff80003c3e0000, vmspace=0xfffff2806cf10200
estcpu=7, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
74232 50227 50194 0 2 0 0 syz-executor
74232 299156 50194 0 3 0 0x4000080 ttyout syz-executor
65847 323757 84738 0 2 0 0 syz-executor
*65847 333021 84738 0 7 0 0x4000000 syz-executor
65847 239768 84738 0 2 0 0x4000000 syz-executor
96038 131000 34672 0 2 0 0 syz-executor
96038 154429 34672 0 3 0 0x4000080 fsleep syz-executor
20297 149626 29769 0 2 0 0 syz-executor
20297 95685 29769 0 3 0 0x4000080 fsleep syz-executor
25202 271678 73069 0 2 0 0 syz-executor
25202 312795 73069 0 2 0 0x4000000 syz-executor
35362 169446 93714 0 2 0 0 syz-executor
35362 473603 93714 0 3 0 0x4000080 fsleep syz-executor
2593 473234 88183 0 2 0x2 0 ndp
88183 584 92556 0 3 0x100002 0x88 sigsusp sh
31259 276201 52712 0 2 0x2 0 arp
52712 226323 59407 0 3 0x100002 0x88 sigsusp sh
84738 519182 60072 0 2 0x2 0xc80 syz-executor
34672 399573 60072 0 2 0x2 0xc80 syz-executor
92556 349152 60072 0 3 0x2 0x80 wait syz-executor
73069 498781 60072 0 7 0x2 0 syz-executor
93714 461788 60072 0 2 0x2 0xc80 syz-executor
50194 511270 60072 0 2 0x2 0xc80 syz-executor
29769 183606 60072 0 3 0x2 0x80 nanoslp syz-executor
59407 404392 60072 0 3 0x2 0x80 wait syz-executor
60072 515089 49116 0 3 0x2 0x80 kqread syz-executor
49116 509987 47173 0 3 0x100002 0x88 sigsusp ksh
47173 301033 25899 0 3 0x10 0x88 kqread sshd-session
25899 315180 60394 0 3 0x12 0x80 kqread sshd-session
30584 299727 1 0 3 0x100003 0x80 ttyin getty
60394 141050 1 0 3 0 0x88 kqread sshd
40206 87798 78298 74 3 0x1100012 0x80 bpf pflogd
78298 348430 1 0 3 0 0x80 sbwait pflogd
7248 93871 18564 73 3 0x1100010 0x80 kqread syslogd
18564 119350 1 0 3 0x100002 0x80 sbwait syslogd
3379 431194 1 0 3 0x100000 0x80 kqread resolvd
79177 233292 60847 77 3 0x100012 0x80 kqread dhcpleased
89107 515586 60847 77 3 0x100012 0x80 kqread dhcpleased
60847 69785 1 0 3 0 0x80 kqread dhcpleased
92155 262171 0 0 3 0x14000 0x200 bored smr
18108 43755 0 0 2 0x14000 0x200 zerothread
1873 345671 0 0 3 0x14000 0x200 aiodoned aiodoned
72626 277721 0 0 3 0x14000 0x200 syncer update
80696 172015 0 0 3 0x14000 0x200 cleaner cleaner
17922 138507 0 0 3 0x14000 0x200 reaper reaper
10176 76329 0 0 3 0x14000 0x200 pgdaemon pagedaemon
87091 157025 0 0 3 0x14000 0x200 bored viomb
79605 237549 0 0 3 0x14000 0x40000200 acpi0 acpi0
70031 383447 0 0 3 0x14000 0x40000200 idle1
29846 97124 0 0 3 0x14000 0x200 bored softnet1
97177 232317 0 0 3 0x14000 0x200 bored softnet0
69924 320531 0 0 3 0x14000 0x200 bored systqmp
62386 404449 0 0 3 0x14000 0x200 bored systq
31171 211898 0 0 3 0x14000 0x200 tmoslp softclockmp
17425 34486 0 0 3 0x14000 0x40000200 tmoslp softclock
6258 332563 0 0 3 0x14000 0x40000200 idle0
1 14720 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{1}> show all locks
Process 65847 (syz-executor) thread 0xffff800039fa34e8 (333021)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b3aa80)
#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 25202 (syz-executor) thread 0xffff800045ff34d8 (312795)
exclusive rrwlock inode r = 0 (0xfffff2800b21bb08)
#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 vget+0x2a2 sys/kern/vfs_subr.c:692
#6 cache_lookup+0x351 sys/kern/vfs_cache.c:222
#7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160
#8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#9 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#10 namei+0x7c5 sys/kern/vfs_lookup.c:250
#11 vn_open+0x178 sys/kern/vfs_vnops.c:146
#12 doopenat+0x35b sys/kern/vfs_syscalls.c:1163
#13 sys_openat+0x58 sys/kern/vfs_syscalls.c:1102
#14 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#14 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#15 Xsyscall+0x128
Process 2593 (ndp) thread 0xffff800045feba10 (473234)
exclusive rwlock vmmaplk r = 0 (0xfffff2800dc9de78)
#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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170
#3 uvm_map_extract+0x17c sys/uvm/uvm_map.c:4242
#4 sys_kbind+0x6e4 sys/uvm/uvm_mmap.c:1279
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#6 Xsyscall+0x128
Process 31259 (arp) thread 0xffff800045ff3240 (276201)
exclusive rwlock amaplk r = 0 (0xfffff2806af476c0)
#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 uvm_unmap_kill_entry_withlock+0xce uvm_map_lock_entry sys/uvm/uvm_map.c:464 [inline]
#2 uvm_unmap_kill_entry_withlock+0xce sys/uvm/uvm_map.c:1870
#3 uvm_unmap_remove+0x6c2 sys/uvm/uvm_map.c:2008
#4 sys_kbind+0xa16 sys/uvm/uvm_mmap.c:1303
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#6 Xsyscall+0x128
exclusive rwlock kmmaplk r = 0 (0xffffffff83aeaa18)
#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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170
#3 sys_kbind+0x9df sys/uvm/uvm_mmap.c:1301
#4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#5 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11060 12089K 12098K 166960K 12161 0
pcb 17 12K 12K 166960K 20 0
rtable 220 6K 6K 166960K 332 0
pf 35 17K 18K 166960K 48 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 1521 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1293 81K 81K 166960K 1376 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 3 0K 0K 166960K 3 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 20 73K 89K 166960K 150 0
proc 69 115K 180K 166960K 544 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 2 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 391 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 231 169K 178K 166960K 3367 0
UVM aobj 3 2K 2K 166960K 3 0
pinsyscall 47 94K 102K 166960K 1337 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 9122K 166960K 4011 0
kqueue 14 22K 22K 166960K 27 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 34 0 31 1 0 1 1 0 8 0
rtentry 176 102 0 1 5 0 5 5 0 8 0
unpcb 144 42 0 25 1 0 1 1 0 8 0
syncache 336 4 0 4 1 1 0 1 0 8 0
tcpcb 736 11 0 7 1 0 1 1 0 8 0
arp 136 17 0 0 1 0 1 1 0 8 0
inpcb 328 73 0 66 1 0 1 1 0 8 0
nd6 152 20 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
pfstscr 40 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
pfrktable 1344 1 0 1 1 0 1 1 0 8 1
pftag 88 1 0 1 1 0 1 1 0 8 1
pfstitem 24 18 0 0 1 0 1 1 0 8 0
pfstkey 128 19 0 1 1 0 1 1 0 8 0
pfstate 448 19 0 1 3 0 3 3 0 8 1
pfrule 1360 22 0 16 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 32 102 0 10 1 0 1 1 0 8 0
semapl 72 1 0 0 1 0 1 1 0 8 0
shmpl 112 1 0 0 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 1598 0 131 92 0 92 92 0 8 0
ffsino 296 1598 0 131 114 0 114 114 0 8 0
nchpl 144 1810 0 106 64 0 64 64 0 8 0
vnodes 216 1695 0 0 95 0 95 95 0 8 0
namei 1024 5585 0 5584 2 1 1 2 0 8 0
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 6312 0 6312 4 3 1 3 1 8 1
plimitpl 152 31 0 14 1 0 1 1 0 8 0
sigapl 424 479 0 429 7 0 7 7 0 8 1
knotepl 120 56 0 0 2 0 2 2 0 8 0
kqueuepl 224 27 0 17 1 0 1 1 0 8 0
pipepl 344 130 0 103 3 0 3 3 0 8 0
fdescpl 528 463 0 429 3 0 3 3 0 8 0
filepl 160 1653 0 1441 10 0 10 10 0 8 0
lockfpl 104 14 0 12 1 0 1 1 0 8 0
lockfspl 48 7 0 5 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 97 0 84 1 0 1 1 0 8 0
zombiepl 144 439 0 439 2 1 1 1 0 8 1
processpl 1232 479 0 429 5 0 5 5 0 8 0
procpl 664 525 0 468 6 0 6 6 0 8 0
sockpl 752 150 0 123 5 1 4 4 0 8 1
mcl64k 65536 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 120 0 0 15 0 15 15 0 8 0
mcl2k 2048 14 0 0 2 0 2 2 0 8 0
mextrefs 64 11 0 0 1 0 1 1 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 124 0 0 8 0 8 8 0 8 0
bufpl 272 2301 0 104 147 0 147 147 0 8 0
anonpl 32 3801 0 0 31 0 31 31 0 247 0
amapchunkpl 152 8978 0 8526 20 0 20 20 0 158 2
amappl16 200 1715 0 1696 6 4 2 5 0 8 0
amappl15 192 12 0 11 1 0 1 1 0 8 0
amappl14 184 440 0 437 1 0 1 1 0 8 0
amappl13 176 177 0 163 1 0 1 1 0 8 0
amappl12 168 721 0 690 2 0 2 2 0 8 0
amappl11 160 55 0 55 1 1 0 1 0 8 0
amappl10 152 61 0 46 1 0 1 1 0 8 0
amappl9 144 309 0 309 1 1 0 1 0 8 0
amappl8 136 100 0 98 1 0 1 1 0 8 0
amappl7 128 150 0 134 1 0 1 1 0 8 0
amappl6 120 156 0 153 1 0 1 1 0 8 0
amappl5 112 103 0 93 1 0 1 1 0 8 0
amappl4 104 297 0 276 1 0 1 1 0 8 0
amappl3 96 1550 0 1456 3 0 3 3 0 8 0
amappl2 88 597 0 520 2 0 2 2 0 8 0
amappl1 80 10615 0 9952 16 2 14 15 0 8 0
amappl 88 2619 0 2467 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 0 1 0 1 1 0 8 0
uaddrrnd 24 463 0 429 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 463 0 429 1 0 1 1 0 8 0
vmmpekpl 168 5972 0 5937 2 0 2 2 0 8 0
vmmpepl 168 39445 0 37462 90 3 87 87 0 357 0
vmsppl 488 462 0 429 5 0 5 5 0 8 0
rwobjpl 80 14776 0 13695 24 1 23 24 0 8 0
pdppl 4096 933 0 858 105 30 75 83 0 8 0
pvpl 32 9477 0 0 77 0 77 77 0 265 0
pmappl 256 462 0 429 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 416 0 34 12 0 12 12 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83975ff0) 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(ffffffff83b3a280) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83b3a280) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
syscall(ffff80002a3267d0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a3267d0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x79acdef63b90, count: 8
ddb{0}> trace
x86_ipi_db(ffffffff83975ff0) 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(ffffffff83b3a280) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83b3a280) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
syscall(ffff80002a3267d0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a3267d0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x79acdef63b90, count: -7
ddb{0}> machine ddbcpu 1
Stopped at sys_shmat+0x453: movq 0(%r15),%rdi
sys_shmat(ffff800039fa34e8,ffff80003c3e5630,ffff80003c3e5580) at sys_shmat+0x453 sys/kern/sysv_shm.c:290
syscall(ffff80003c3e5630) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3e5630) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6f08a4a7520, count: 12
ddb{1}> trace
sys_shmat(ffff800039fa34e8,ffff80003c3e5630,ffff80003c3e5580) at sys_shmat+0x453 sys/kern/sysv_shm.c:290
syscall(ffff80003c3e5630) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3e5630) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6f08a4a7520, count: -3
Struck through repros no longer work on HEAD.