Warning: Permanently added '10.128.15.224' (ECDSA) to the list of known hosts.
executing program
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex pipe mutex (pipe mutex) r = 0 (0xfffff80004c19eb0) locked @ /syzkaller/managers/main/kernel/sys/kern/sys_pipe.c:964
stack backtrace:
#0 0xffffffff8110b9fe at witness_debugger+0x8e
#1 0xffffffff8110d080 at witness_warn+0x640
#2 0xffffffff817166a0 at trap_pfault+0x80
#3 0xffffffff8171560d at trap+0x44d
#4 0xffffffff816de505 at calltrap+0x8
#5 0xffffffff81118298 at pipe_write+0x16d8
#6 0xffffffff8111271d at dofilewrite+0xfd
#7 0xffffffff81112116 at kern_writev+0x66
#8 0xffffffff81112600 at sys_writev+0x50
#9 0xffffffff81717806 at amd64_syscall+0x436
#10 0xffffffff816deded at fast_syscall_common+0x101


Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address	= 0x30
fault code		= supervisor read data  , page not present
instruction pointer	= 0x20:0xffffffff8156d5fa
stack pointer	        = 0x28:0xfffffe00212317a0
frame pointer	        = 0x28:0xfffffe00212317e0
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 759 (syz-executor7892514)
trap number		= 12
panic: page fault
cpuid = 1
time = 1553056409
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0021231400
vpanic() at vpanic+0x1e0/frame 0xfffffe0021231460
panic() at panic+0x43/frame 0xfffffe00212314c0
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe0021231540
trap_pfault() at trap_pfault+0x9f/frame 0xfffffe00212315b0
trap() at trap+0x44d/frame 0xfffffe00212316d0
calltrap() at calltrap+0x8/frame 0xfffffe00212316d0
--- trap 0xc, rip = 0xffffffff8156d5fa, rsp = 0xfffffe00212317a0, rbp = 0xfffffe00212317e0 ---
vm_page_unhold_pages() at vm_page_unhold_pages+0x5a/frame 0xfffffe00212317e0
pipe_write() at pipe_write+0x16d8/frame 0xfffffe00212318b0
dofilewrite() at dofilewrite+0xfd/frame 0xfffffe0021231910
kern_writev() at kern_writev+0x66/frame 0xfffffe0021231950
sys_writev() at sys_writev+0x50/frame 0xfffffe0021231980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0021231ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0021231ab0
--- syscall (0, FreeBSD ELF64, nosys), rip = 0x4576ca, rsp = 0x7fffdfffdf88, rbp = 0x6b5c08 ---
KDB: enter: panic
[ thread pid 759 tid 100103 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why