On Fri, 15 Sep 2023 20:20:12 +0200, Mark Hills wrote: > > On Fri, 15 Sep 2023, Takashi Iwai wrote: > > > On Fri, 15 Sep 2023 19:30:51 +0200, Takashi Iwai wrote: > > > > > > On Fri, 15 Sep 2023 18:04:35 +0200, Mark Hills wrote: > [...] > > > > I upgraded from 6.1.0 to 6.5.3 and Reaper now crashes or hangs on startup > > > > with the trace below in dmesg. > > > > > > > > The newer kernel already includes a fix very similar to below, so I think > > > > an issue remains. > > > > > > > > I did not dig deeper than capturing information and finding this related > > > > thread. > > > (snip) > > > > [ 72.601440] BUG: kernel NULL pointer dereference, address: 0000000000000020 > > > (snip) > > > > [ 72.601455] RIP: 0010:snd_rawmidi_proc_info_read+0x35/0x220 [snd_rawmidi] > > > (snip) > > > > [ 72.601477] Call Trace: > > > > [ 72.601478] <TASK> > > > > [ 72.601479] ? __die+0x1b/0x60 > > > > [ 72.601482] ? page_fault_oops+0x154/0x420 > > > > [ 72.601485] ? mas_update_gap.part.0+0xac/0x1f0 > > > > [ 72.601488] ? sched_clock_cpu+0xb/0x190 > > > > [ 72.601491] ? __smp_call_single_queue+0x2f/0x50 > > > > [ 72.601493] ? exc_page_fault+0x37a/0x560 > > > > [ 72.601495] ? seq_open+0x4b/0x70 > > > > [ 72.601497] ? asm_exc_page_fault+0x22/0x30 > > > > [ 72.601501] ? snd_rawmidi_proc_info_read+0x35/0x220 [snd_rawmidi] > > > > [ 72.601505] snd_info_seq_show+0x21/0x40 [snd] > > > > [ 72.601511] seq_read_iter+0x105/0x4a0 > > > > [ 72.601514] seq_read+0x9e/0xd0 > > > > [ 72.601516] proc_reg_read+0x50/0xa0 > > > > [ 72.601518] vfs_read+0xa4/0x300 > > > > [ 72.601521] ? __do_sys_newfstatat+0x35/0x60 > > > > [ 72.601524] ksys_read+0x5a/0xe0 > > > > [ 72.601526] do_syscall_64+0x38/0x90 > > > > [ 72.601528] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 > > > > > > It must be a completely different bug. It comes from the proc fs > > > read, not the read over sequencer device itself. > > > > Does the change below fix the problem? > > It does! At least it passes my initial test. Reaper starts up now. Good to hear. I'll submit the proper fix patch. thanks, Takashi
