Messages in this thread | | | Date | Fri, 18 Sep 2015 12:02:15 -0400 | From | Murali Karicheri <> | Subject | possible reason: unannotated irqs-off |
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All,
While chasing a fix for a deadlock in netcp driver with debug options enabled, i bumped on another warning shown below.. Looks like I need to enable CONFIG_IRQSOFF_TRACER as well to get rid of this. Have anyone seen this? My google search showed me some connection with this option and I enabled it as well and I don't see the warning anymore. Any idea if this is a false alarm or a real bug? Looks like I need to enable CONFIG_IRQSOFF_TRACER as well. If so, I can send a patch. Either way let me know.
Murali
[ 17.401337] ------------[ cut here ]------------ [ 17.405991] WARNING: CPU: 2 PID: 1201 at kernel/locking/lockdep.c:3557 check_flags.part.37+0x224/0x228() [ 17.415508] DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled) [ 17.420836] Modules linked in: [ 17.424087] CPU: 2 PID: 1201 Comm: udevd Tainted: G W 4.1.6-01270-gcdac6fd #1 [ 17.432379] Hardware name: Keystone [ 17.435894] [<c00178e4>] (unwind_backtrace) from [<c0013cbc>] (show_stack+0x10/0x14) [ 17.443673] [<c0013cbc>] (show_stack) from [<c05ff398>] (dump_stack+0x84/0xc4) [ 17.450926] [<c05ff398>] (dump_stack) from [<c0028990>] (warn_slowpath_common+0x84/0xb4) [ 17.459048] [<c0028990>] (warn_slowpath_common) from [<c00289f0>] (warn_slowpath_fmt+0x30/0x40) [ 17.467781] [<c00289f0>] (warn_slowpath_fmt) from [<c006c37c>] (check_flags.part.37+0x224/0x228) [ 17.476601] [<c006c37c>] (check_flags.part.37) from [<c006ce48>] (lock_is_held+0x88/0x94) [ 17.484811] [<c006ce48>] (lock_is_held) from [<c008eb9c>] (rcu_note_context_switch+0x854/0x8c0) [ 17.493545] [<c008eb9c>] (rcu_note_context_switch) from [<c0600b54>] (__schedule+0x40/0x844) [ 17.502017] [<c0600b54>] (__schedule) from [<c0601398>] (schedule+0x40/0x98) [ 17.509097] [<c0601398>] (schedule) from [<c001364c>] (do_work_pending+0x24/0xb0) [ 17.516610] [<c001364c>] (do_work_pending) from [<c000ffc4>] (work_pending+0xc/0x20) [ 17.524380] ---[ end trace fe0042166f5d3227 ]--- [ 17.529009] possible reason: unannotated irqs-off. [ 17.533813] irq event stamp: 331979 [ 17.537308] hardirqs last enabled at (331979): [<c000fffc>] no_work_pending+0x8/0x30 [ 17.545172] hardirqs last disabled at (331978): [<c000ffe4>] ret_slow_syscall+0xc/0x10 [ 17.553123] softirqs last enabled at (327182): [<c002ca90>] __do_softirq+0x4dc/0x6cc [ 17.560987] softirqs last disabled at (327177): [<c002cf88>] irq_exit+0x98/0xcc
-- Murali Karicheri Linux Kernel, Keystone
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