On Thu, May 23, 2019 at 08:58:58AM +0800, kernel test robot wrote:
> FYI, we noticed the following commit (built with gcc-7):
>
> commit: e52271917f9f5159c791eda8ba748a66d659c27e ("[PATCH v4 5/7] mm: rework non-root kmem_cache lifecycle management")
> url: https://github.com/0day-ci/linux/commits/Roman-Gushchin/mm-reparent-slab-memory-on-cgroup-removal/20190517-173841
>
>
> in testcase: nvml
> with following parameters:
>
> group: obj
> test: non-pmem
>
>
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +------------------------------------------------------------------------------+------------+------------+
> | | ff756a15f3 | e52271917f |
> +------------------------------------------------------------------------------+------------+------------+
> | boot_successes | 5 | 4 |
> | boot_failures | 861 | 852 |
> | BUG:kernel_reboot-without-warning_in_test_stage | 738 | 163 |
> | BUG:kernel_hang_in_boot_stage | 120 | 122 |
> | BUG:soft_lockup-CPU##stuck_for#s | 4 | 1 |
> | RIP:free_unref_page | 1 | |
> | Kernel_panic-not_syncing:softlockup:hung_tasks | 4 | 1 |
> | RIP:free_reserved_area | 3 | 1 |
> | BUG:sleeping_function_called_from_invalid_context_at_mm/slab.h | 0 | 560 |
> | BUG:scheduling_while_atomic | 0 | 561 |
> | WARNING:at_lib/usercopy.c:#_copy_to_user | 0 | 116 |
> | RIP:_copy_to_user | 0 | 116 |
> | WARNING:at_arch/x86/kernel/fpu/signal.c:#copy_fpstate_to_sigframe | 0 | 534 |
> | RIP:copy_fpstate_to_sigframe | 0 | 532 |
> | WARNING:at_arch/x86/kernel/signal.c:#do_signal | 0 | 527 |
> | RIP:do_signal | 0 | 526 |
> | WARNING:at_lib/usercopy.c:#_copy_from_user | 0 | 389 |
> | RIP:_copy_from_user | 0 | 388 |
> | kernel_BUG_at_mm/vmalloc.c | 0 | 304 |
> | invalid_opcode:#[##] | 0 | 304 |
> | RIP:__get_vm_area_node | 0 | 301 |
> | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 294 |
> | Kernel_panic-not_syncing:Aiee,killing_interrupt_handler | 0 | 155 |
> | WARNING:at_fs/read_write.c:#vfs_write | 0 | 15 |
> | RIP:vfs_write | 0 | 15 |
> | BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c | 0 | 101 |
> | BUG:sleeping_function_called_from_invalid_context_at_include/linux/uaccess.h | 0 | 54 |
> | Kernel_panic-not_syncing:Attempted_to_kill_init!exitcode= | 0 | 47 |
> | BUG:sleeping_function_called_from_invalid_context_at_lib/iov_iter.c | 0 | 1 |
> | BUG:sleeping_function_called_from_invalid_context_at_fs/dcache.c | 0 | 57 |
> | BUG:sleeping_function_called_from_invalid_context_at_mm/memory.c | 0 | 1 |
> | BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/mutex.c | 0 | 104 |
> | BUG:kernel_hang_in_test_stage | 0 | 5 |
> | WARNING:at_arch/x86/include/asm/uaccess.h:#strncpy_from_user | 0 | 4 |
> | RIP:strncpy_from_user | 0 | 4 |
> | WARNING:at_fs/read_write.c:#vfs_read | 0 | 4 |
> | RIP:vfs_read | 0 | 4 |
> | BUG:sleeping_function_called_from_invalid_context_at_mm/filemap.c | 0 | 3 |
> | BUG:sleeping_function_called_from_invalid_context_at_mm/page_alloc.c | 0 | 8 |
> | BUG:sleeping_function_called_from_invalid_context_at_mm/gup.c | 0 | 1 |
> | BUG:sleeping_function_called_from_invalid_context_at_include/linux/freezer.h | 0 | 1 |
> | BUG:sleeping_function_called_from_invalid_context_at/kb | 0 | 1 |
> +------------------------------------------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <rong.a.chen@xxxxxxxxx>
Hi!
It seems that it's caused by unbalanced rcu_read_lock(),
which already has been fixed in v5.
Thanks!
