Re: INFO: rcu detected stall in blkdev_ioctl

2018-05-05 Thread Tetsuo Handa
If various stall reports regarding loop_set_fd() are hitting below sequence, a patch was proposed at https://groups.google.com/d/msg/syzkaller-bugs/5pzXJ8yQFR0/vWeRytaQBAAJ . -- #include #include #include #include #include int main(int argc, char *argv[]) { const int fd =

Re: INFO: rcu detected stall in blkdev_ioctl

2018-05-05 Thread Tetsuo Handa
If various stall reports regarding loop_set_fd() are hitting below sequence, a patch was proposed at https://groups.google.com/d/msg/syzkaller-bugs/5pzXJ8yQFR0/vWeRytaQBAAJ . -- #include #include #include #include #include int main(int argc, char *argv[]) { const int fd =

Re: INFO: rcu detected stall in blkdev_ioctl

2018-04-28 Thread Tetsuo Handa
Like I noted in a patch at https://groups.google.com/d/msg/syzkaller-bugs/2Rw8-OM6IbM/PzdobV8kAgAJ loop module is not thread safe. Can we use more global lock?

Re: INFO: rcu detected stall in blkdev_ioctl

2018-04-28 Thread Tetsuo Handa
Like I noted in a patch at https://groups.google.com/d/msg/syzkaller-bugs/2Rw8-OM6IbM/PzdobV8kAgAJ loop module is not thread safe. Can we use more global lock?

Re: INFO: rcu detected stall in blkdev_ioctl

2018-04-27 Thread syzbot
syzbot has found reproducer for the following crash on upstream commit d8a332730e757129e70675679f2b2a03f1ecf65e (Fri Apr 27 17:39:38 2018 +) Merge tag 'char-misc-4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc syzbot dashboard link:

Re: INFO: rcu detected stall in blkdev_ioctl

2018-04-27 Thread syzbot
syzbot has found reproducer for the following crash on upstream commit d8a332730e757129e70675679f2b2a03f1ecf65e (Fri Apr 27 17:39:38 2018 +) Merge tag 'char-misc-4.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc syzbot dashboard link: