On Sat, Sep 9, 2017 at 8:58 PM, Guenter Roeck <[email protected]> wrote: > Hi, > > I noticed that nios2 images crash in mainline. Bisect points to commit > 33d72f3822d7 ("init/main.c: extract early boot entropy from the passed > cmdline"). Bisect log is attached. > > As far as I can see, the problem is seen because add_device_randomness() > calls random_get_entropy(). However, the underlying timer function > used by the nios2 architecture (nios2_timer_read) is not yet initialized, > causing a NULL pointer access and crash. A sample crash log is at > > http://kerneltests.org/builders/qemu-nios2-master/builds/175/steps/qemubuildcommand/logs/stdio
Oh, yikes. Do you have a full call trace? (Does this come through get_cycles() or via the It seems like we could either initialize the timer earlier or allow it to fall back when not initialized... -Kees > > Guenter > > --- > # bad: [4dfc2788033d30dfccfd4268e06dd73ce2c654ed] Merge tag > 'iommu-updates-v4.14' of > git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu > # good: [5969d1bb3082b41eba8fd2c826559abe38ccb6df] Merge branch > 'gperf-removal' > git bisect start 'HEAD' '5969d1bb3082' > # bad: [fbd01410e89a66f346ba1b3c0161e1198449b746] Merge > git://git.kernel.org/pub/scm/linux/kernel/git/davem/net > git bisect bad fbd01410e89a66f346ba1b3c0161e1198449b746 > # good: [0d519f2d1ed1f11e49abc88cfcf6cf13b83ba14c] Merge tag > 'pci-v4.14-changes' of > git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci > git bisect good 0d519f2d1ed1f11e49abc88cfcf6cf13b83ba14c > # bad: [229cf16d3c8ac2e9b082c223fd0e619dc8f62cc1] sh: defconfig: cleanup from > old Kconfig options > git bisect bad 229cf16d3c8ac2e9b082c223fd0e619dc8f62cc1 > # good: [1caffba9db4aa27c3e7ebc05668afca1f991ab8d] > drivers/scsi/sym53c8xx_2/sym_hipd.c: convert to use memset32 > git bisect good 1caffba9db4aa27c3e7ebc05668afca1f991ab8d > # good: [7c61bd6983b185272315722787cceacf5f5d2e7d] lib/cmdline.c: remove > meaningless comment > git bisect good 7c61bd6983b185272315722787cceacf5f5d2e7d > # bad: [718b303b49893d8f9dd469f710d76f77673bd35d] autofs: use > AUTOFS_DEV_IOCTL_SIZE > git bisect bad 718b303b49893d8f9dd469f710d76f77673bd35d > # good: [9367bb730e4d9d85a8911a08a3542ec2aa873d37] binfmt_flat: delete two > error messages for a failed memory allocation in decompress_exec() > git bisect good 9367bb730e4d9d85a8911a08a3542ec2aa873d37 > # bad: [e54c7bcbf14a25dc3a913b4c808b52121c522e9b] autofs: make disc device > user accessible > git bisect bad e54c7bcbf14a25dc3a913b4c808b52121c522e9b > # bad: [33d72f3822d7ff8a9e45bd7413c811085cb87aa5] init/main.c: extract early > boot entropy from the passed cmdline > git bisect bad 33d72f3822d7ff8a9e45bd7413c811085cb87aa5 > # good: [121388a31362b0d3176dc1190ac8064b98a61b20] init: move stack canary > initialization after setup_arch > git bisect good 121388a31362b0d3176dc1190ac8064b98a61b20 > # first bad commit: [33d72f3822d7ff8a9e45bd7413c811085cb87aa5] init/main.c: > extract early boot entropy from the passed cmdline -- Kees Cook Pixel Security
