7ecdadf7f8
The current walk_stackframe with FRAME_POINTER would stop unwinding at ret_from_exception: BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1518 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1, name: init CPU: 0 PID: 1 Comm: init Not tainted 5.10.113-00021-g15c15974895c-dirty #192 Call Trace: [<ffffffe0002038c8>] walk_stackframe+0x0/0xee [<ffffffe000aecf48>] show_stack+0x32/0x4a [<ffffffe000af1618>] dump_stack_lvl+0x72/0x8e [<ffffffe000af1648>] dump_stack+0x14/0x1c [<ffffffe000239ad2>] ___might_sleep+0x12e/0x138 [<ffffffe000239aec>] __might_sleep+0x10/0x18 [<ffffffe000afe3fe>] down_read+0x22/0xa4 [<ffffffe000207588>] do_page_fault+0xb0/0x2fe [<ffffffe000201b80>] ret_from_exception+0x0/0xc The optimization would help walk_stackframe cross the pt_regs frame and get more backtrace of debug info: BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1518 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1, name: init CPU: 0 PID: 1 Comm: init Not tainted 5.10.113-00021-g15c15974895c-dirty #192 Call Trace: [<ffffffe0002038c8>] walk_stackframe+0x0/0xee [<ffffffe000aecf48>] show_stack+0x32/0x4a [<ffffffe000af1618>] dump_stack_lvl+0x72/0x8e [<ffffffe000af1648>] dump_stack+0x14/0x1c [<ffffffe000239ad2>] ___might_sleep+0x12e/0x138 [<ffffffe000239aec>] __might_sleep+0x10/0x18 [<ffffffe000afe3fe>] down_read+0x22/0xa4 [<ffffffe000207588>] do_page_fault+0xb0/0x2fe [<ffffffe000201b80>] ret_from_exception+0x0/0xc [<ffffffe000613c06>] riscv_intc_irq+0x1a/0x72 [<ffffffe000201b80>] ret_from_exception+0x0/0xc [<ffffffe00033f44a>] vma_link+0x54/0x160 [<ffffffe000341d7a>] mmap_region+0x2cc/0x4d0 [<ffffffe000342256>] do_mmap+0x2d8/0x3ac [<ffffffe000326318>] vm_mmap_pgoff+0x70/0xb8 [<ffffffe00032638a>] vm_mmap+0x2a/0x36 [<ffffffe0003cfdde>] elf_map+0x72/0x84 [<ffffffe0003d05f8>] load_elf_binary+0x69a/0xec8 [<ffffffe000376240>] bprm_execve+0x246/0x53a [<ffffffe00037786c>] kernel_execve+0xe8/0x124 [<ffffffe000aecdf2>] run_init_process+0xfa/0x10c [<ffffffe000aece16>] try_to_run_init_process+0x12/0x3c [<ffffffe000afa920>] kernel_init+0xb4/0xf8 [<ffffffe000201b80>] ret_from_exception+0x0/0xc Here is the error injection test code for the above output: drivers/irqchip/irq-riscv-intc.c: static asmlinkage void riscv_intc_irq(struct pt_regs *regs) { unsigned long cause = regs->cause & ~CAUSE_IRQ_FLAG; + u32 tmp; __get_user(tmp, (u32 *)0); Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Link: https://lore.kernel.org/r/20221109064937.3643993-3-guoren@kernel.org [Palmer: use SYM_CODE_*] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> |
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.