fd9f30d103
Guenter Roeck reported this kernel crash on his emulated B160L machine: Starting network: udhcpc: started, v1.36.1 Backtrace: [<104320d4>] unwind_once+0x1c/0x5c [<10434a00>] walk_stackframe.isra.0+0x74/0xb8 [<10434a6c>] arch_stack_walk+0x28/0x38 [<104e5efc>] stack_trace_save+0x48/0x5c [<105d1bdc>] set_track_prepare+0x44/0x6c [<105d9c80>] ___slab_alloc+0xfc4/0x1024 [<105d9d38>] __slab_alloc.isra.0+0x58/0x90 [<105dc80c>] kmem_cache_alloc_noprof+0x2ac/0x4a0 [<105b8e54>] __anon_vma_prepare+0x60/0x280 [<105a823c>] __vmf_anon_prepare+0x68/0x94 [<105a8b34>] do_wp_page+0x8cc/0xf10 [<105aad88>] handle_mm_fault+0x6c0/0xf08 [<10425568>] do_page_fault+0x110/0x440 [<10427938>] handle_interruption+0x184/0x748 [<11178398>] schedule+0x4c/0x190 BUG: spinlock recursion on CPU#0, ifconfig/2420 lock: terminate_lock.2+0x0/0x1c, .magic: dead4ead, .owner: ifconfig/2420, .owner_cpu: 0 While creating the stack trace, the unwinder uses the stack pointer to guess the previous frame to read the previous stack pointer from memory. The crash happens, because the unwinder tries to read from unaligned memory and as such triggers the unalignment trap handler which then leads to the spinlock recursion and finally to a deadlock. Fix it by checking the alignment before accessing the memory. Reported-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Helge Deller <deller@gmx.de> Tested-by: Guenter Roeck <linux@roeck-us.net> Cc: stable@vger.kernel.org # v6.12+ |
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| .. | ||
| syscalls | ||
| vdso32 | ||
| vdso64 | ||
| .gitignore | ||
| Makefile | ||
| alternative.c | ||
| asm-offsets.c | ||
| audit.c | ||
| cache.c | ||
| compat_audit.c | ||
| drivers.c | ||
| entry.S | ||
| firmware.c | ||
| ftrace.c | ||
| hardware.c | ||
| head.S | ||
| hpmc.S | ||
| inventory.c | ||
| irq.c | ||
| jump_label.c | ||
| kexec.c | ||
| kexec_file.c | ||
| kgdb.c | ||
| kprobes.c | ||
| module.c | ||
| pacache.S | ||
| parisc_ksyms.c | ||
| patch.c | ||
| pci-dma.c | ||
| pci.c | ||
| pdc_chassis.c | ||
| pdc_cons.c | ||
| pdt.c | ||
| perf.c | ||
| perf_asm.S | ||
| perf_event.c | ||
| perf_images.h | ||
| perf_regs.c | ||
| process.c | ||
| processor.c | ||
| ptrace.c | ||
| real2.S | ||
| relocate_kernel.S | ||
| setup.c | ||
| signal.c | ||
| signal32.c | ||
| signal32.h | ||
| smp.c | ||
| stacktrace.c | ||
| sys_parisc.c | ||
| sys_parisc32.c | ||
| syscall.S | ||
| time.c | ||
| toc.c | ||
| toc_asm.S | ||
| topology.c | ||
| traps.c | ||
| unaligned.c | ||
| unaligned.h | ||
| unwind.c | ||
| vdso.c | ||
| vmlinux.lds.S | ||