On 4/3/19 5:11 AM, Will Deacon wrote: > Hi Michael, > > On Wed, Apr 03, 2019 at 01:47:50PM +1100, Michael Ellerman wrote: >> Arnd Bergmann <arnd@xxxxxxxx> writes: >>> diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl >>> index b18abb0c3dae..00f5a63c8d9a 100644 >>> --- a/arch/powerpc/kernel/syscalls/syscall.tbl >>> +++ b/arch/powerpc/kernel/syscalls/syscall.tbl >>> @@ -505,3 +505,7 @@ >>> 421 32 rt_sigtimedwait_time64 sys_rt_sigtimedwait compat_sys_rt_sigtimedwait_time64 >>> 422 32 futex_time64 sys_futex sys_futex >>> 423 32 sched_rr_get_interval_time64 sys_sched_rr_get_interval sys_sched_rr_get_interval >>> +424 common pidfd_send_signal sys_pidfd_send_signal >>> +425 common io_uring_setup sys_io_uring_setup >>> +426 common io_uring_enter sys_io_uring_enter >>> +427 common io_uring_register sys_io_uring_register >> >> Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> (powerpc) >> >> Lightly tested. >> >> The pidfd_test selftest passes. > > That reports pass for me too, although it fails to unshare the pid ns, which I > assume is benign. > >> Ran the io_uring example from fio, which prints lots of: > > How did you invoke that? I had a play with the tests in: It's t/io_uring from the fio repo: git://git.kernel.dk/fio and you just run it ala: # make t/io_uring # t/io_uring /dev/some_device > git://git.kernel.dk/liburing > > but I quickly ran into the kernel oops below. > > Will > > --->8 > > will@autoplooker:~/liburing/test$ ./io_uring_register > RELIMIT_MEMLOCK: 67108864 (67108864) > [ 35.477875] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000070 > [ 35.478969] Mem abort info: > [ 35.479296] ESR = 0x96000004 > [ 35.479785] Exception class = DABT (current EL), IL = 32 bits > [ 35.480528] SET = 0, FnV = 0 > [ 35.480980] EA = 0, S1PTW = 0 > [ 35.481345] Data abort info: > [ 35.481680] ISV = 0, ISS = 0x00000004 > [ 35.482267] CM = 0, WnR = 0 > [ 35.482618] user pgtable: 4k pages, 48-bit VAs, pgdp = (____ptrval____) > [ 35.483486] [0000000000000070] pgd=0000000000000000 > [ 35.484041] Internal error: Oops: 96000004 [#1] PREEMPT SMP > [ 35.484788] Modules linked in: > [ 35.485311] CPU: 113 PID: 3973 Comm: io_uring_regist Not tainted 5.1.0-rc3-00012-g40b114779944 #1 > [ 35.486712] Hardware name: linux,dummy-virt (DT) > [ 35.487450] pstate: 20400005 (nzCv daif +PAN -UAO) > [ 35.488228] pc : link_pwq+0x10/0x60 > [ 35.488794] lr : apply_wqattrs_commit+0xe0/0x118 > [ 35.489550] sp : ffff000017e2bbc0 Huh, this looks odd, it's crashing inside the wq setup. -- Jens Axboe
