panic: pool_do_get: shmpl free list modified: page 0xfffffd807bfea000; item addr 0xfffffd807bfeaa38; offset 0x2c=0xdead410f
Starting stack trace...
panic(ffffffff830649de) at panic+0x1d0 sys/kern/subr_prf.c:229
pool_do_get(ffffffff835bb610,1,ffff800036fdd4d8) at pool_do_get+0x5e6
pool_get(ffffffff835bb610,1) at pool_get+0x141
shmget_allocate_segment(ffff80002e5842e8,ffff800036fdd730,4,ffff800036fdd680) at shmget_allocate_segment+0x1a7
sys_shmget(ffff80002e5842e8,ffff800036fdd730,ffff800036fdd680) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480
syscall(ffff800036fdd730) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff800036fdd730) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xa60d7e7f660, count: 250
End of stack trace.
syncing disks...panic: kernel diagnostic assertion "rw_write_held(uobj->vmobjlock)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_vnode.c", line 611
Starting stack trace...
panic(ffffffff830e7e1e) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff8309988b,ffffffff82fda117,263,ffffffff83018c96) at __assert+0x29
uvn_flush(fffffd807a6147a0,0,0,31) at uvn_flush+0xdfd sys/uvm/uvm_vnode.c:754
uvm_vnp_sync(ffff800000a5e000) at uvm_vnp_sync+0x1e7 sys/uvm/uvm_vnode.c:1542
sys_sync(ffff80002e5842e8,0,0) at sys_sync+0xd4 sys/kern/vfs_syscalls.c:536
vfs_syncwait(ffff80002e5842e8,1) at vfs_syncwait+0x44
vfs_shutdown(ffff80002e5842e8) at vfs_shutdown+0x97 sys/kern/vfs_subr.c:1791
boot(100) at boot+0x15c sys/arch/amd64/amd64/machdep.c:907
reboot(100) at reboot+0xb1
panic(ffffffff830649de) at panic+0x1f9 sys/kern/subr_prf.c:231
pool_do_get(ffffffff835bb610,1,ffff800036fdd4d8) at pool_do_get+0x5e6
pool_get(ffffffff835bb610,1) at pool_get+0x141
shmget_allocate_segment(ffff80002e5842e8,ffff800036fdd730,4,ffff800036fdd680) at shmget_allocate_segment+0x1a7
sys_shmget(ffff80002e5842e8,ffff800036fdd730,ffff800036fdd680) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480
syscall(ffff800036fdd730) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff800036fdd730) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xa60d7e7f660, count: 241
End of stack trace.

dump to dev 4,1 not possible
rebooting...
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000080000000 = 2048 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID 0d5ef51b-0062-dd1a-a10b-15f17b148763
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f27c0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...
>> OpenBSD/amd64 BOOT 3.67
boot> set $lines = 0
set: syntax error
boot> set $maxwidth = 0
set: syntax error
boot> show panic
boot: illegal argument panic
boot> trace
boot> show registers
boot> show proc
boot> ps
boot> show all locks
boot> show malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace