On Thu, Apr 23, 2015 at 6:07 PM, Josh Boyer <jwbo...@fedoraproject.org> wrote: > Hi All, > > We've had a user report the following backtrace from the bridge module > with a recent Linus' tree. Has anything like this been reported yet? > If you have any questions on setup, the user is CC'd. >
I too observed similar backtrace once(not able to reproduce it again) while I was trying to check inconsistent lock state[1] with lockdep enabled. Regards, Sudeep [1] https://lkml.org/lkml/2015/4/23/329 --->8 =============================== [ INFO: suspicious RCU usage. ] 4.0.0 #269 Not tainted ------------------------------- include/trace/events/ipi.h:68 suspicious rcu_dereference_check() usage! other info that might help us debug this: RCU used illegally from idle CPU! rcu_scheduler_active = 1, debug_locks = 1 RCU used illegally from extended quiescent state! no locks held by swapper/0/0. stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.0.0 #269 Hardware name: ARM-Versatile Express [<c00151f1>] (unwind_backtrace) from [<c0011971>] (show_stack+0x11/0x14) [<c0011971>] (show_stack) from [<c05627c7>] (dump_stack+0x73/0x8c) [<c05627c7>] (dump_stack) from [<c0013e63>] (handle_IPI+0x257/0x410) [<c0013e63>] (handle_IPI) from [<c000932b>] (gic_handle_irq+0x4f/0x50) [<c000932b>] (gic_handle_irq) from [<c00121ff>] (__irq_svc+0x3f/0x64) Exception stack(0xc083bf30 to 0xc083bf78) bf20: 00000001 00000001 00000000 c0841938 bf40: c083a000 c083d5fc c08ba5c8 c083d598 00000000 00000000 c08b938f c056afc8 bf60: 00000008 c083bf78 c005d157 c000f288 40000133 ffffffff [<c00121ff>] (__irq_svc) from [<c000f288>] (arch_cpu_idle+0x30/0x34) [<c000f288>] (arch_cpu_idle) from [<c00555d5>] (cpu_startup_entry+0x339/0x404) [<c00555d5>] (cpu_startup_entry) from [<c07d1a4f>] (start_kernel+0x32f/0x338) [<c07d1a4f>] (start_kernel) from [<8000807f>] (0x8000807f) =============================== [ INFO: suspicious RCU usage. ] 4.0.0 #269 Not tainted ------------------------------- include/trace/events/ipi.h:84 suspicious rcu_dereference_check() usage! other info that might help us debug this: RCU used illegally from idle CPU! rcu_scheduler_active = 1, debug_locks = 1 RCU used illegally from extended quiescent state! no locks held by swapper/0/0. stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.0.0 #269 Hardware name: ARM-Versatile Express [<c00151f1>] (unwind_backtrace) from [<c0011971>] (show_stack+0x11/0x14) [<c0011971>] (show_stack) from [<c05627c7>] (dump_stack+0x73/0x8c) [<c05627c7>] (dump_stack) from [<c0013f85>] (handle_IPI+0x379/0x410) [<c0013f85>] (handle_IPI) from [<c000932b>] (gic_handle_irq+0x4f/0x50) [<c000932b>] (gic_handle_irq) from [<c00121ff>] (__irq_svc+0x3f/0x64) Exception stack(0xc083bf30 to 0xc083bf78) bf20: 00000001 00000001 00000000 c0841938 bf40: c083a000 c083d5fc c08ba5c8 c083d598 00000000 00000000 c08b938f c056afc8 bf60: 00000008 c083bf78 c005d157 c000f288 40000133 ffffffff [<c00121ff>] (__irq_svc) from [<c000f288>] (arch_cpu_idle+0x30/0x34) [<c000f288>] (arch_cpu_idle) from [<c00555d5>] (cpu_startup_entry+0x339/0x404) [<c00555d5>] (cpu_startup_entry) from [<c07d1a4f>] (start_kernel+0x32f/0x338) [<c07d1a4f>] (start_kernel) from [<8000807f>] (0x8000807f) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
