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f15c21a3deAdd arch_trigger_cpumask_backtrace() which is a generic infrastructure for sampling other CPUs' backtrace using IPI. The feature is used when lockups are detected or in case of oops/panic if parameters are set accordingly. Below is the case of oops with the oops_all_cpu_backtrace enabled. $ sysctl kernel.oops_all_cpu_backtrace=1 triggering oops shows: [ 212.214237] NMI backtrace for cpu 1 [ 212.214390] CPU: 1 PID: 610 Comm: in:imklog Tainted: G OE 6.10.0-rc6 #1 [ 212.214570] Hardware name: riscv-virtio,qemu (DT) [ 212.214690] epc : fallback_scalar_usercopy+0x8/0xdc [ 212.214809] ra : _copy_to_user+0x20/0x40 [ 212.214913] epc : ffffffff80c3a930 ra : ffffffff8059ba7e sp : ff20000000eabb50 [ 212.215061] gp : ffffffff82066f90 tp : ff6000008e958000 t0 : 3463303866660000 [ 212.215210] t1 : 000000000000005b t2 : 3463303866666666 s0 : ff20000000eabb60 [ 212.215358] s1 : 0000000000000386 a0 : 00007ff6e81df926 a1 : ff600000824df800 [ 212.215505] a2 : 000000000000003f a3 : 7fffffffffffffc0 a4 : 0000000000000000 [ 212.215651] a5 : 000000000000003f a6 : 0000000000000000 a7 : 0000000000000000 [ 212.215857] s2 : ff600000824df800 s3 : ffffffff82066cc0 s4 : 0000000000001c1a [ 212.216074] s5 : ffffffff8206a5a8 s6 : 00007ff6e81df926 s7 : ffffffff8206a5a0 [ 212.216278] s8 : ff600000824df800 s9 : ffffffff81e25de0 s10: 000000000000003f [ 212.216471] s11: ffffffff8206a59d t3 : ff600000824df812 t4 : ff600000824df812 [ 212.216651] t5 : ff600000824df818 t6 : 0000000000040000 [ 212.216796] status: 0000000000040120 badaddr: 0000000000000000 cause: 8000000000000001 [ 212.217035] [<ffffffff80c3a930>] fallback_scalar_usercopy+0x8/0xdc [ 212.217207] [<ffffffff80095f56>] syslog_print+0x1f4/0x2b2 [ 212.217362] [<ffffffff80096e5c>] do_syslog.part.0+0x94/0x2d8 [ 212.217502] [<ffffffff800979e8>] do_syslog+0x66/0x88 [ 212.217636] [<ffffffff803a5dda>] kmsg_read+0x44/0x5c [ 212.217764] [<ffffffff80392dbe>] proc_reg_read+0x7a/0xa8 [ 212.217952] [<ffffffff802ff726>] vfs_read+0xb0/0x24e [ 212.218090] [<ffffffff803001ba>] ksys_read+0x64/0xe4 [ 212.218264] [<ffffffff8030025a>] __riscv_sys_read+0x20/0x2c [ 212.218453] [<ffffffff80c4af9a>] do_trap_ecall_u+0x60/0x1d4 [ 212.218664] [<ffffffff80c56998>] ret_from_exception+0x0/0x64 Signed-off-by: Ryo Takakura <takakura@valinux.co.jp> Link: https://lore.kernel.org/r/20240718093659.158912-1-takakura@valinux.co.jp Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> |
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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 reStructuredText 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.