From: Ingo Molnar improved the print-fatal-signals debug output: hotplug/825: potentially unexpected fatal signal 11. code at ffffe400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 vDSO at b7f41000 Pid: 825, comm: hotplug EIP: 0073:[] CPU: 0 EIP is at 0xffffe400 ESP: 007b:bff52910 EFLAGS: 00010246 Not tainted (2.6.17-rc4 #91) EAX: 000000af EBX: 00000000 ECX: 00000000 EDX: 080f341c ESI: 00000008 EDI: 41c9eff4 EBP: bff529ac DS: 007b ES: 007b CR0: 8005003b CR2: ffffe40f CR3: 372a3000 CR4: 00000680 [] show_trace+0xd/0x10 [] show_regs+0x177/0x180 [] get_signal_to_deliver+0x3f3/0x7d0 [] do_notify_resume+0x1bc/0x750 [] work_notifysig+0x13/0x19 08047000-080e9000 r-xp 00000000 03:01 3547392 /bin/bash 080e9000-080ef000 rw-p 000a1000 03:01 3547392 /bin/bash 080ef000-080f4000 rw-p 080ef000 00:00 0 [heap] 41b5a000-41b73000 r-xp 00000000 03:01 846154 /lib/ld-2.3.90.so 41b73000-41b74000 r--p 00018000 03:01 846154 /lib/ld-2.3.90.so 41b74000-41b75000 rw-p 00019000 03:01 846154 /lib/ld-2.3.90.so 41b77000-41c9d000 r-xp 00000000 03:01 846155 /lib/libc-2.3.90.so 41c9d000-41c9f000 r--p 00125000 03:01 846155 /lib/libc-2.3.90.so 41c9f000-41ca1000 rw-p 00127000 03:01 846155 /lib/libc-2.3.90.so 41ca1000-41ca3000 rw-p 41ca1000 00:00 0 41ccc000-41cce000 r-xp 00000000 03:01 846157 /lib/libdl-2.3.90.so 41cce000-41ccf000 r--p 00001000 03:01 846157 /lib/libdl-2.3.90.so 41ccf000-41cd0000 rw-p 00002000 03:01 846157 /lib/libdl-2.3.90.so 41dce000-41dd1000 r-xp 00000000 03:01 846175 /lib/libtermcap.so.2.0.8 41dd1000-41dd2000 rw-p 00002000 03:01 846175 /lib/libtermcap.so.2.0.8 b7f29000-b7f2a000 rw-p b7f29000 00:00 0 b7f40000-b7f41000 rw-p b7f40000 00:00 0 b7f41000-b7f42000 r-xp b7f41000 00:00 0 [vdso] bff3e000-bff53000 rw-p bff3e000 00:00 0 [stack] Signed-off-by: Ingo Molnar Signed-off-by: Arjan van de Ven Signed-off-by: Andrew Morton --- kernel/signal.c | 97 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 95 insertions(+), 2 deletions(-) diff -puN kernel/signal.c~vdso-improve-print_fatal_signals-support-by-adding-memory-maps kernel/signal.c --- a/kernel/signal.c~vdso-improve-print_fatal_signals-support-by-adding-memory-maps +++ a/kernel/signal.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -771,7 +772,95 @@ out_set: #define LEGACY_QUEUE(sigptr, sig) \ (((sig) < SIGRTMIN) && sigismember(&(sigptr)->signal, (sig))) -int print_fatal_signals = 0; +int print_fatal_signals; + +static void pad_len_spaces(int len) +{ + len = 25 + sizeof(void*) * 6 - len; + + if (len < 1) + len = 1; + + printk("%*c", len, ' '); +} + +static int print_vma(struct vm_area_struct *vma) +{ + struct mm_struct *mm = vma->vm_mm; + struct file *file = vma->vm_file; + int flags = vma->vm_flags; + unsigned long ino = 0; + dev_t dev = 0; + int len; + + if (file) { + struct inode *inode = vma->vm_file->f_dentry->d_inode; + dev = inode->i_sb->s_dev; + ino = inode->i_ino; + } + + printk("%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n", + vma->vm_start, + vma->vm_end, + flags & VM_READ ? 'r' : '-', + flags & VM_WRITE ? 'w' : '-', + flags & VM_EXEC ? 'x' : '-', + flags & VM_MAYSHARE ? 's' : 'p', + vma->vm_pgoff << PAGE_SHIFT, + MAJOR(dev), MINOR(dev), ino, &len); + + /* + * Print the dentry name for named mappings, and a + * special [heap] marker for the heap: + */ + if (file) { +#define SIZE 128 + char tmp[SIZE], *str; + + str = d_path(file->f_dentry, file->f_vfsmnt, tmp, SIZE); + while (str[0] && (str[0] == ' ')) + str++; + + pad_len_spaces(len); + printk("%s", str); + } else { + const char *name = arch_vma_name(vma); + if (!name) { + if (mm) { + if (vma->vm_start <= mm->start_brk && + vma->vm_end >= mm->brk) { + name = "[heap]"; + } else if (vma->vm_start <= mm->start_stack && + vma->vm_end >= mm->start_stack) { + name = "[stack]"; + } + } else { + name = "[vdso]"; + } + } + if (name) { + pad_len_spaces(len); + printk(name); + } + } + printk("\n"); + + return 0; +} + +static void print_vmas(void) +{ + struct vm_area_struct *vma; + struct mm_struct *mm = current->mm; + + if (!mm) + return; + + down_read(&mm->mmap_sem); + for (vma = mm->mmap; vma; vma = vma->vm_next) + print_vma(vma); + up_read(&mm->mmap_sem); +} static void print_fatal_signal(struct pt_regs *regs, int signr) { @@ -789,9 +878,13 @@ static void print_fatal_signal(struct pt printk("%02x ", insn); } } -#endif printk("\n"); + if (current->mm) + printk("vDSO at %p\n", current->mm->context.vdso); +#endif show_regs(regs); + printk("\n"); + print_vmas(); } static int __init setup_print_fatal_signals(char *str) _