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Date: Wed, 28 May 2014 10:36:58 +0300 (EEST)
From: Meelis Roos <mroos@...ux.ee>
To: sparclinux@...r.kernel.org,
Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: sparc64: hugetlb-related possible irq lock inversion dependency
detected
I revived my V240 and tried 3.15.0-rc7 on it. Works but got this lockdep
warning during debian update:
[ 427.942320]
[ 427.961785] =========================================================
[ 428.046421] [ INFO: possible irq lock inversion dependency detected ]
[ 428.131065] 3.15.0-rc7 #2 Not tainted
[ 428.179091] ---------------------------------------------------------
[ 428.263738] dpkg-deb/3253 just changed the state of lock:
[ 428.334652] (ctx_alloc_lock){+.....}, at: [<00000000004503e4>] hugetlb_setup+0xc4/0x120
[ 428.441023] but this lock was taken by another, HARDIRQ-safe lock in the past:
[ 428.535963] (&rq->lock){-.-.-.}
[ 428.535963]
[ 428.535963] and interrupts could create inverse lock ordering between them.
[ 428.535963]
[ 428.657213]
[ 428.657213] other info that might help us debug this:
[ 428.743092] Chain exists of:
[ 428.743092] &rq->lock --> &(&mm->context.lock)->rlock --> ctx_alloc_lock
[ 428.743092]
[ 428.856308] Possible interrupt unsafe locking scenario:
[ 428.856308]
[ 428.945538] CPU0 CPU1
[ 429.005005] ---- ----
[ 429.064480] lock(ctx_alloc_lock);
[ 429.110222] local_irq_disable();
[ 429.188012] lock(&rq->lock);
[ 429.261199] lock(&(&mm->context.lock)->rlock);
[ 429.354991] <Interrupt>
[ 429.389308] lock(&rq->lock);
[ 429.431622]
[ 429.431622] *** DEADLOCK ***
[ 429.431622]
[ 429.509426] no locks held by dpkg-deb/3253.
[ 429.564311]
[ 429.564311] the shortest dependencies between 2nd lock and 1st lock:
[ 429.667267] -> (&rq->lock){-.-.-.} ops: 1524679030341632 {
[ 429.741588] IN-HARDIRQ-W at:
[ 429.785053] [<00000000004ad234>] __lock_acquire+0x6d4/0x960
[ 429.885718] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 429.981795] [<000000000083f628>] _raw_spin_lock+0x28/0x40
[ 430.080160] [<000000000048fbec>] scheduler_tick+0x2c/0xc0
[ 430.178523] [<000000000046a748>] update_process_times+0x48/0x60
[ 430.283752] [<00000000004cf65c>] tick_periodic+0xbc/0xe0
[ 430.380971] [<00000000004cf68c>] tick_handle_periodic+0xc/0x80
[ 430.485058] [<000000000042fbf4>] timer_interrupt+0x94/0xc0
[ 430.584564] [<0000000000426b84>] valid_addr_bitmap_patch+0xbc/0x238
[ 430.694368] [<00000000004bbc48>] console_unlock+0x2a8/0x360
[ 430.795020] [<0000000000a2dd4c>] con_init+0x2a0/0x2c0
[ 430.888802] [<0000000000a2d328>] console_init+0x1c/0x38
[ 430.984885] [<0000000000a167d8>] start_kernel+0x268/0x370
[ 431.083252] [<000000000082c50c>] tlb_fixup_done+0xa0/0xb4
[ 431.181616] [< (null)>] (null)
[ 431.270826] IN-SOFTIRQ-W at:
[ 431.314281] [<00000000004ad234>] __lock_acquire+0x6d4/0x960
[ 431.414947] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 431.511025] [<000000000083f700>] _raw_spin_lock_irqsave+0x40/0x60
[ 431.618542] [<00000000004978e4>] update_blocked_averages+0x24/0x180
[ 431.728344] [<000000000049dba4>] rebalance_domains+0x24/0x3a0
[ 431.831283] [<000000000049e0e0>] run_rebalance_domains+0x20/0x40
[ 431.937654] [<0000000000462950>] __do_softirq+0xf0/0x240
[ 432.034875] [<000000000042bc0c>] do_softirq_own_stack+0x2c/0x40
[ 432.140102] [<0000000000462d8c>] irq_exit+0x4c/0xc0
[ 432.231597] [<000000000042fbfc>] timer_interrupt+0x9c/0xc0
[ 432.331113] [<0000000000426b84>] valid_addr_bitmap_patch+0xbc/0x238
[ 432.440917] [<000000000042c60c>] arch_cpu_idle+0x2c/0xe0
[ 432.538137] [<00000000004a5c88>] cpuidle_idle_call+0x48/0xc0
[ 432.639934] [<00000000004a5e10>] cpu_idle_loop+0x110/0x160
[ 432.739442] [<00000000004a5e78>] cpu_startup_entry+0x18/0x40
[ 432.841239] [<000000000082c698>] rest_init+0x178/0x1a0
[ 432.936171] [<0000000000a168d0>] start_kernel+0x360/0x370
[ 433.034536] [<000000000082c50c>] tlb_fixup_done+0xa0/0xb4
[ 433.132901] [< (null)>] (null)
[ 433.222109] IN-RECLAIM_FS-W at:
[ 433.268997] [<00000000004ad234>] __lock_acquire+0x6d4/0x960
[ 433.373094] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 433.472604] [<000000000083f628>] _raw_spin_lock+0x28/0x40
[ 433.574399] [<000000000048ade0>] task_rq_lock+0x40/0xa0
[ 433.673906] [<0000000000492c08>] set_cpus_allowed_ptr+0x8/0x140
[ 433.782568] [<0000000000515630>] kswapd+0x30/0x1c0
[ 433.876350] [<0000000000482610>] kthread+0xb0/0xe0
[ 433.970138] [<00000000004060c4>] ret_from_fork+0x1c/0x2c
[ 434.070800] [< (null)>] (null)
[ 434.163436] INITIAL USE at:
[ 434.205750] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 434.300698] [<000000000083f700>] _raw_spin_lock_irqsave+0x40/0x60
[ 434.407072] [<000000000048bd64>] rq_attach_root+0x4/0x1e0
[ 434.504290] [<0000000000a1ef6c>] sched_init+0x2f4/0x460
[ 434.599223] [<0000000000a166f4>] start_kernel+0x184/0x370
[ 434.696444] [<000000000082c50c>] tlb_fixup_done+0xa0/0xb4
[ 434.793666] [< (null)>] (null)
[ 434.881730] }
[ 434.905746] ... key at: [<0000000001081bac>] __key.43057+0x0/0xc
[ 434.993822] ... acquired at:
[ 435.034994] [<00000000004ac230>] validate_chain.isra.14+0x4d0/0x5e0
[ 435.120782] [<00000000004ad408>] __lock_acquire+0x8a8/0x960
[ 435.197413] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 435.269469] [<000000000083f700>] _raw_spin_lock_irqsave+0x40/0x60
[ 435.352967] [<000000000083b604>] __schedule+0x4e4/0x700
[ 435.425025] [<000000000083b9c0>] schedule+0x60/0x80
[ 435.492507] [<0000000000489c5c>] smpboot_thread_fn+0x21c/0x260
[ 435.572573] [<0000000000482610>] kthread+0xb0/0xe0
[ 435.638909] [<00000000004060c4>] ret_from_fork+0x1c/0x2c
[ 435.712114] [< (null)>] (null)
[ 435.777307]
[ 435.796748] -> (&(&mm->context.lock)->rlock){......} ops: 5660234320183296 {
[ 435.890535] INITIAL USE at:
[ 435.931710] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 436.024365] [<000000000083f700>] _raw_spin_lock_irqsave+0x40/0x60
[ 436.128456] [<000000000044dfb4>] tsb_grow+0xf4/0x240
[ 436.217662] [<000000000044e140>] init_new_context+0x40/0x80
[ 436.314890] [<000000000056311c>] do_execve_common.isra.20+0xfc/0x2e0
[ 436.422406] [<0000000000563314>] do_execve+0x14/0x40
[ 436.511613] [<0000000000426d20>] run_init_process+0x20/0x40
[ 436.608841] [<0000000000426d44>] try_to_run_init_process+0x4/0x60
[ 436.712925] [<000000000082c754>] kernel_init+0x94/0x100
[ 436.805565] [<00000000004060c4>] ret_from_fork+0x1c/0x2c
[ 436.899354] [< (null)>] (null)
[ 436.985137] }
[ 437.008008] ... key at: [<0000000000a5a528>] __key.23586+0x0/0x8
[ 437.094940] ... acquired at:
[ 437.134970] [<00000000004ac230>] validate_chain.isra.14+0x4d0/0x5e0
[ 437.220759] [<00000000004ad408>] __lock_acquire+0x8a8/0x960
[ 437.297389] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 437.369446] [<000000000083f628>] _raw_spin_lock+0x28/0x40
[ 437.443793] [<000000000044fc30>] get_new_mmu_context+0x10/0x160
[ 437.525000] [<0000000000562410>] exec_mmap+0x90/0x260
[ 437.594770] [<0000000000562610>] flush_old_exec+0x30/0xa0
[ 437.669117] [<00000000005b3a10>] load_elf_binary+0x350/0xae0
[ 437.746895] [<0000000000561d4c>] search_binary_handler+0x8c/0x220
[ 437.830391] [<00000000008336fc>] exec_binprm+0x134/0x1a0
[ 437.903589] [<00000000005631fc>] do_execve_common.isra.20+0x1dc/0x2e0
[ 437.991664] [<0000000000563314>] do_execve+0x14/0x40
[ 438.060287] [<0000000000426d20>] run_init_process+0x20/0x40
[ 438.136921] [<0000000000426d44>] try_to_run_init_process+0x4/0x60
[ 438.220419] [<000000000082c754>] kernel_init+0x94/0x100
[ 438.292474] [<00000000004060c4>] ret_from_fork+0x1c/0x2c
[ 438.365677] [< (null)>] (null)
[ 438.430871]
[ 438.450311] -> (ctx_alloc_lock){+.....} ops: 41008347742208 {
[ 438.525799] HARDIRQ-ON-W at:
[ 438.566975] [<00000000004ad234>] __lock_acquire+0x6d4/0x960
[ 438.663064] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 438.754562] [<000000000083f628>] _raw_spin_lock+0x28/0x40
[ 438.848351] [<00000000004503e4>] hugetlb_setup+0xc4/0x120
[ 438.942141] [<000000000044f2a8>] do_sparc64_fault+0x608/0x720
[ 439.040513] [<0000000000407adc>] sparc64_realfault_common+0x10/0x20
[ 439.145740] INITIAL USE at:
[ 439.185759] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 439.276123] [<000000000083f628>] _raw_spin_lock+0x28/0x40
[ 439.368769] [<000000000044fc30>] get_new_mmu_context+0x10/0x160
[ 439.468286] [<0000000000562410>] exec_mmap+0x90/0x260
[ 439.556348] [<0000000000562610>] flush_old_exec+0x30/0xa0
[ 439.648996] [<00000000005b3a10>] load_elf_binary+0x350/0xae0
[ 439.745078] [<0000000000561d4c>] search_binary_handler+0x8c/0x220
[ 439.846876] [<00000000008336fc>] exec_binprm+0x134/0x1a0
[ 439.938372] [<00000000005631fc>] do_execve_common.isra.20+0x1dc/0x2e0
[ 440.044750] [<0000000000563314>] do_execve+0x14/0x40
[ 440.131669] [<0000000000426d20>] run_init_process+0x20/0x40
[ 440.226610] [<0000000000426d44>] try_to_run_init_process+0x4/0x60
[ 440.328408] [<000000000082c754>] kernel_init+0x94/0x100
[ 440.418757] [<00000000004060c4>] ret_from_fork+0x1c/0x2c
[ 440.510260] [< (null)>] (null)
[ 440.593753] }
[ 440.615483] ... key at: [<00000000009d5e38>] ctx_alloc_lock+0x18/0x38
[ 440.706991] ... acquired at:
[ 440.745876] [<000000000083018c>] mark_lock_irq+0x128/0x344
[ 440.821368] [<00000000004ac7f0>] mark_lock+0x3b0/0x500
[ 440.892282] [<00000000004acaa8>] mark_irqflags+0x168/0x220
[ 440.967772] [<00000000004ad234>] __lock_acquire+0x6d4/0x960
[ 441.044403] [<00000000004ada6c>] lock_acquire+0x4c/0x80
[ 441.116460] [<000000000083f628>] _raw_spin_lock+0x28/0x40
[ 441.190806] [<00000000004503e4>] hugetlb_setup+0xc4/0x120
[ 441.265154] [<000000000044f2a8>] do_sparc64_fault+0x608/0x720
[ 441.344074] [<0000000000407adc>] sparc64_realfault_common+0x10/0x20
[ 441.429858]
[ 441.449297]
[ 441.449297] stack backtrace:
[ 441.506502] CPU: 0 PID: 3253 Comm: dpkg-deb Not tainted 3.15.0-rc7 #2
[ 441.591138] Call Trace:
[ 441.623158] [00000000004aa8bc] print_irq_inversion_bug+0x1dc/0x200
[ 441.705518] [00000000004aab00] check_usage_backwards+0x100/0x120
[ 441.785580] [000000000083018c] mark_lock_irq+0x128/0x344
[ 441.856494] [00000000004ac7f0] mark_lock+0x3b0/0x500
[ 441.922832] [00000000004acaa8] mark_irqflags+0x168/0x220
[ 441.993747] [00000000004ad234] __lock_acquire+0x6d4/0x960
[ 442.065805] [00000000004ada6c] lock_acquire+0x4c/0x80
[ 442.133288] [000000000083f628] _raw_spin_lock+0x28/0x40
[ 442.203058] [00000000004503e4] hugetlb_setup+0xc4/0x120
[ 442.272827] [000000000044f2a8] do_sparc64_fault+0x608/0x720
[ 442.347174] [0000000000407adc] sparc64_realfault_common+0x10/0x20
--
Meelis Roos (mroos@...ux.ee)
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