Messages in this thread | | | Date | Tue, 16 Oct 2007 14:55:21 +0400 | From | Alexey Dobriyan <> | Subject | sparse breakage triggered by rcu_read_lock() lockdep annotations |
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FWIW, commit 851a67b825540a8e00c0be3ee25e4627ba8b133b aka "lockdep: annotate rcu_read_{,un}lock{,_bh}" causes sparse to trigger internal assertion in quite a few places over allyesconfig run.
sparse: flow.c:805: rewrite_parent_branch: Assertion `changed' failed.
Trimmed down testcase:
void f(unsigned long ip); static void g(void) { if (1) { f(({ __label__ x; x: (unsigned long)&&x; })); } f(({ __label__ x; x: (unsigned long)&&x; })); }
#0 0x4001c410 in __kernel_vsyscall () (gdb) bt #0 0x4001c410 in __kernel_vsyscall () #1 0x40050701 in raise () from /lib/libc.so.6 #2 0x40051e38 in abort () from /lib/libc.so.6 #3 0x40049fcc in __assert_fail () from /lib/libc.so.6 #4 0x08064947 in pack_basic_blocks (ep=0x411a1c6c) at flow.c:812 #5 0x0805ffbf in linearize_symbol (sym=0x4103ec8c) at linearize.c:2154 #6 0x080492a3 in main (argc=Cannot access memory at address 0x274d) at sparse.c:266
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