On Sun, Oct 6, 2019 at 3:25 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote: > this patch causes all my sparc64 emulations to stall during boot. It causes > all alpha emulations to crash with [1a] and [1b] when booting from a virtual > disk, and one of the xtensa emulations to crash with [2]. [...] > [2] > > Unable to handle kernel paging request at virtual address 0000000000000004 > reboot(50): Oops -1 > pc = [<0000000000000004>] ra = [<fffffc00004512e4>] ps = 0000 Tainted: G D > pc is at 0x4 > ra is at filldir64+0x64/0x320 > v0 = 0000000000000000 t0 = 0000000067736d6b t1 = 000000012011445b > t2 = 0000000000000000 t3 = 0000000000000000 t4 = 0000000000007ef8 > t5 = 0000000120114448 t6 = 0000000000000000 t7 = fffffc0007eec000 > s0 = fffffc000792b5c3 s1 = 0000000000000004 s2 = 0000000000000018 > s3 = fffffc0007eefec8 s4 = 0000000000000008 s5 = 00000000f00000a3 > s6 = 000000000000000b > a0 = fffffc000792b5c3 a1 = 2f2f2f2f2f2f2f2f a2 = 0000000000000004 > a3 = 000000000000000b a4 = 00000000f00000a3 a5 = 0000000000000008 > t8 = 0000000000000018 t9 = 0000000000000000 t10= 0000000022e1d02a > t11= 000000011fd6f3b8 pv = fffffc0000b9a810 at = 0000000022e1ccf8 > gp = fffffc0000f03930 sp = (____ptrval____) > Trace: > [<fffffc00004ccba0>] proc_readdir_de+0x170/0x300 > [<fffffc0000451280>] filldir64+0x0/0x320 > [<fffffc00004c565c>] proc_root_readdir+0x3c/0x80 > [<fffffc0000450c68>] iterate_dir+0x198/0x240 > [<fffffc00004518b8>] ksys_getdents64+0xa8/0x160 > [<fffffc0000451990>] sys_getdents64+0x20/0x40 > [<fffffc0000451280>] filldir64+0x0/0x320 > [<fffffc0000311634>] entSys+0xa4/0xc0 This doesn't look like a dump from xtensa core. v5.4-rc2 kernel doesn't crash for me on xtensa, but the userspace doesn't work well, because all directories appear to be empty. __put_user/__get_user don't do unaligned access on xtensa, they check address alignment and return -EFAULT if it's bad. -- Thanks. -- Max
