On Tuesday, 4 of December 2007, Andrew Morton wrote: > On Mon, 3 Dec 2007 23:34:26 +0100 "Rafael J. Wysocki" <[EMAIL PROTECTED]> > wrote: > > > On Monday, 3 of December 2007, Andrew Morton wrote: > > > On Sun, 2 Dec 2007 21:33:23 +0100 "Rafael J. Wysocki" <[EMAIL PROTECTED]> > > > wrote: > > > > > > > On Saturday, 1 of December 2007, Pavel Machek wrote: > > > > > Hi! > > > > > > > > > > > 2.6.24-rc3-mm2 (which will be released if it boots on two more > > > > > > machines and > > > > > > if I stay awake) will say this during suspend-to-RAM on the Vaio: > > > > > > > > > > > > [ 91.876445] Syncing filesystems ... done. > > > > > > [ 92.382595] Freezing user space processes ... WARNING: at > > > > > > kernel/lockdep.c:2662 check_flags() > > > > > > [ 92.384000] Pid: 1925, comm: dbus-daemon Not tainted > > > > > > 2.6.24-rc3-mm2 #32 > > > > > > [ 92.384177] [<c0104a74>] show_trace_log_lvl+0x12/0x25 > > > > > > [ 92.384335] [<c01052ff>] show_trace+0xd/0x10 > > > > > > [ 92.384469] [<c01059be>] dump_stack+0x55/0x5d > > > > > > [ 92.384605] [<c0136a29>] check_flags+0x7f/0x11a > > > > > > [ 92.384746] [<c0139cfb>] lock_acquire+0x3a/0x86 > > > > > > [ 92.384886] [<c031f4de>] _spin_lock+0x26/0x53 > > > > > > [ 92.385023] [<c0141d3b>] refrigerator+0x13/0xc8 > > > > > > [ 92.385163] [<c01274c8>] get_signal_to_deliver+0x32/0x3fb > > > > > > [ 92.385326] [<c01030f4>] do_notify_resume+0x8c/0x699 > > > > > > [ 92.385476] [<c0103c18>] work_notifysig+0x13/0x1b > > > > > > [ 92.385620] ======================= > > > > > > [ 92.385719] irq event stamp: 309 > > > > > > [ 92.385809] hardirqs last enabled at (309): [<c0103c79>] > > > > > > syscall_exit_work+0x11/0x26 > > > > > > [ 92.386045] hardirqs last disabled at (308): [<c0103b42>] > > > > > > syscall_exit+0x14/0x25 > > > > > > [ 92.386265] softirqs last enabled at (0): [<c011bea5>] > > > > > > copy_process+0x374/0x130e > > > > > > [ 92.386491] softirqs last disabled at (0): [<00000000>] 0x0 > > > > > > [ 92.392457] (elapsed 0.00 seconds) done. > > > > > > [ 92.392581] Freezing remaining freezable tasks ... (elapsed 0.00 > > > > > > seconds) done. > > > > > > [ 92.392882] PM: Entering mem sleep > > > > > > [ 92.392974] Suspending console(s) > > > > > > > > > > > > this has been happening for quite some time and might even be > > > > > > happening in > > > > > > mainline. > > > > > > > > > > Is it complaining that we entered refrigerator with irqs disabled? > > > > > > > > Or that someone else called task_lock() with irqs disabled at one point > > > > ... > > > > > > > > Hm, perhaps it's related to kernel preemption. Andrew, I guess the > > > > kernel is > > > > preemptible? > > > > > > > > > > yup. http://userweb.kernel.org/~akpm/config-sony.txt > > > > Is this reproducible with kernel preemption off? > > yes. Current -mm lineup: > > [ 34.455096] ipw2200: Failed to send WEP_KEY: Command timed out. > [ 34.911876] Syncing filesystems ... done. > [ 34.934526] Freezing user space processes ... WARNING: at > kernel/lockdep.c:2662 check_flags() > [ 34.934917] Pid: 1922, comm: dbus-daemon Not tainted 2.6.24-rc3-mm3 #2 > [ 34.935036] [<c0104853>] show_trace_log_lvl+0x12/0x25 > [ 34.935142] [<c010506c>] show_trace+0xd/0x10 > [ 34.935231] [<c0105850>] dump_stack+0x55/0x5d > [ 34.935322] [<c0136125>] check_flags+0x7f/0x11a > [ 34.935417] [<c0139210>] lock_acquire+0x3a/0x86 > [ 34.935511] [<c0318faf>] _spin_lock+0x1c/0x49 > [ 34.935603] [<c0140fc7>] refrigerator+0x13/0xc8 > [ 34.935697] [<c01270ac>] get_signal_to_deliver+0x34/0x2e8 > [ 34.935807] [<c0102edc>] do_notify_resume+0x8c/0x6fe > [ 34.935907] [<c0103a2c>] work_notifysig+0x13/0x1b > [ 34.936004] ======================= > [ 34.936072] irq event stamp: 253 > [ 34.936133] hardirqs last enabled at (253): [<c0103a8d>] > syscall_exit_work+0x11/0x26 > [ 34.936294] hardirqs last disabled at (252): [<c0103956>] > syscall_exit+0x14/0x25 > [ 34.936446] softirqs last enabled at (0): [<c011baf9>] > copy_process+0x300/0x1246 > [ 34.936599] softirqs last disabled at (0): [<00000000>] 0x0 > [ 34.954308] (elapsed 0.01 seconds) done. > [ 34.954389] Freezing remaining freezable tasks ... (elapsed 0.00 seconds) > done.
Hmm, do I understand correctly that lockdep expects us to disable interrupts before acquiring the task lock in refrigerator()? That would be strange. Ingo, can you have a look at this, please? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/