On Fri, 10 Mar 2017 10:19:13 +0100, Dmitry Vyukov wrote: > > On Sat, Mar 4, 2017 at 5:31 PM, Dmitry Vyukov <dvyu...@google.com> wrote: > > Hello, > > > > The following program creates processes deadlocked in snd_seq_pool_done: > > > > https://gist.githubusercontent.com/dvyukov/97efc9cb6d63b1b2c7b737b82cc8b0d6/raw/3546b133ae0b2d3e1190ae7c1f4e240ce7ce132e/gistfile1.txt > > > > After few seconds I get: > > > > # ps afxu | grep a.out > > root 8660 2.0 0.0 0 0 pts/0 Zl 16:27 0:00 > > [a.out] <defunct> > > > > # kill -9 8660 > > > > # cat /proc/8660/status > > Name: a.out > > State: Z (zombie) > > Tgid: 8660 > > Ngid: 0 > > Pid: 8660 > > PPid: 1 > > TracerPid: 0 > > Uid: 0 0 0 0 > > Gid: 0 0 0 0 > > FDSize: 0 > > Groups: 0 > > NStgid: 8660 > > NSpid: 8660 > > NSpgid: 8660 > > NSsid: 2971 > > Threads: 2 > > SigQ: 1/3304 > > SigPnd: 0000000000000000 > > ShdPnd: 0000000000000100 > > SigBlk: 0000000000000000 > > SigIgn: 0000000180000000 > > SigCgt: 0000000000000440 > > CapInh: 0000000000000000 > > CapPrm: 0000003fffffffff > > CapEff: 0000003fffffffff > > CapBnd: 0000003fffffffff > > CapAmb: 0000000000000000 > > NoNewPrivs: 0 > > Seccomp: 0 > > Cpus_allowed: f > > Cpus_allowed_list: 0-3 > > Mems_allowed: 00000000,00000001 > > Mems_allowed_list: 0 > > voluntary_ctxt_switches: 12 > > nonvoluntary_ctxt_switches: 0 > > > > # cat /proc/8660/task/*/stack > > [<ffffffff835406db>] snd_seq_pool_done+0x31b/0x620 > > sound/core/seq/seq_memory.c:436 > > [<ffffffff8353a11e>] snd_seq_ioctl_set_client_pool+0x1ae/0x600 > > sound/core/seq/seq_clientmgr.c:1836 > > [<ffffffff835382ba>] snd_seq_ioctl+0x2da/0x4d0 > > sound/core/seq/seq_clientmgr.c:2130 > > [<ffffffff81aced2f>] vfs_ioctl fs/ioctl.c:45 [inline] > > [<ffffffff81aced2f>] do_vfs_ioctl+0x1bf/0x1790 fs/ioctl.c:685 > > [<ffffffff81ad038f>] SYSC_ioctl fs/ioctl.c:700 [inline] > > [<ffffffff81ad038f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 > > [<ffffffff8457dc41>] entry_SYSCALL_64_fastpath+0x1f/0xc2 > > > A friendly ping.
Sorry for the delay, I've been on vacation for over the last two weeks. (And I have a deja vu feeing, as if I so often receive your syzkaller bug reports during or just before my vacation in the past, too... :) Will take a look at this soon after digesting the pending mails. thanks, Takashi
