syzbot

bash-4.3$ kernel panic at kern/drivers/dev/mnt.c:1106, from core 2: rpc tags
Stack Backtrace on Core 2:
#01 [<0xffffffffc200a3b7>] in backtrace at src/kdebug.c:219
#02 [<0xffffffffc2009b7c>] in _panic at src/init.c:266
#03 [<0xffffffffc207db68>] in mntralloc at drivers/dev/mnt.c:1106
#04 [<0xffffffffc207dc13>] in mntflushalloc at drivers/dev/mnt.c:1033
#05 [<0xffffffffc207e06a>] in mountio at drivers/dev/mnt.c:831
#06 [<0xffffffffc207e195>] in mountrpc at drivers/dev/mnt.c:770
#07 [<0xffffffffc207f139>] in mntrdwr at drivers/dev/mnt.c:740
#08 [<0xffffffffc207f24d>] in mntread at drivers/dev/mnt.c:687
#09 [<0xffffffffc203f733>] in rread at src/ns/sysfile.c:763
#10 [<0xffffffffc203f8db>] in sysread at src/ns/sysfile.c:821
#11 [<0xffffffffc2055ca1>] in sys_read at src/syscall.c:1779
#12 [<0xffffffffc2059149>] in syscall at src/syscall.c:2528
#13 [<0xffffffffc2059304>] in run_local_syscall at src/syscall.c:2563
#14 [<0xffffffffc2059839>] in prep_syscalls at src/syscall.c:2583
#15 [<0xffffffffc20aaf1a>] in sysenter_callwrapper at arch/x86/trap.c:859
kernel panic at kern/drivers/dev/mnt.c:1106, from core 0: rpc tags
Stack Backtrace on Core 0:
#01 [<0xffffffffc200a3b7>] in backtrace at src/kdebug.c:219
#02 [<0xffffffffc2009b7c>] in _panic at src/init.c:266
#03 [<0xffffffffc207db68>] in mntralloc at drivers/dev/mnt.c:1106
#04 [<0xffffffffc207ed98>] in mntwalk at drivers/dev/mnt.c:441
#05 [<0xffffffffc2032dcd>] in walk at src/ns/chan.c:809
#06 [<0xffffffffc20334d9>] in __namec_from at src/ns/chan.c:1131
#07 [<0xffffffffc20340af>] in namec at src/ns/chan.c:1509
#08 [<0xffffffffc2041566>] in sysopenat at src/ns/sysfile.c:590
#09 [<0xffffffffc205859f>] in sys_openat at src/syscall.c:1805
#10 [<0xffffffffc2059149>] in syscall at src/syscall.c:2528
#11 [<0xffffffffc2059304>] in run_local_syscall at src/syscall.c:2563
#12 [<0xffffffffc2059839>] in prep_syscalls at src/syscall.c:2583
#13 [<0xffffffffc20aaf1a>] in sysenter_callwrapper at arch/x86/trap.c:859