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On Fri, Sep 08, 2006 at 01:13:17AM -0700, Andrew Morton wrote: > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm1/ > Lockdep issues the following warning: [ 16.835268] Freeing unused kernel memory: 260k freed [ 16.842715] Write protecting the kernel read-only data: 432k [ 17.796518] BUG: warning at kernel/lockdep.c:2359/check_flags() [ 17.804117] [<c0104436>] dump_trace+0x1f3/0x22a [ 17.811514] [<c0104493>] show_trace_log_lvl+0x26/0x3c [ 17.818984] [<c0104b58>] show_trace+0x1b/0x1d [ 17.826397] [<c0104c43>] dump_stack+0x24/0x26 [ 17.833856] [<c013775e>] check_flags+0x1e4/0x2b1 [ 17.841400] [<c013a9e2>] lock_acquire+0x21/0x7a [ 17.848977] [<c0135a50>] down_write+0x50/0x69 [ 17.856557] [<c01640d4>] sys_brk+0x23/0xe7 [ 17.864105] [<c01031f6>] sysenter_past_esp+0x5f/0x99 [ 17.871556] [<b7faf410>] 0xb7faf410 [ 17.878831] ======================= [ 17.885839] irq event stamp: 8318 [ 17.892746] hardirqs last enabled at (8317): [<c01032c8>] restore_nocheck+0x12/0x15 [ 17.906778] hardirqs last disabled at (8318): [<c0103203>] sysenter_past_esp+0x6c/0x99 [ 17.921481] softirqs last enabled at (7128): [<c0123cd1>] __do_softirq+0xe9/0xfa [ 17.936962] softirqs last disabled at (7121): [<c0123d3e>] do_softirq+0x5c/0x60 I've replaced the DEBUG_LOCKS_WARN_ON by a BUG, and it appears that the user space program calling sys_brk is hotplug. This is 100% reproducible, it happens at (nearly) the same time, at each boot. The lspci, .config and dmesg are available at http://fdeweerdt.free.fr/lockdep_warning I'm going to try to bisect sysenter_past_esp by instering some TRACE_IRQS_ON between the beginning of the routine and the actual syscall to see when the irq enabling is missed. Thanks, Frederik - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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