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Date: Thu, 26 Jan 2017 15:36:14 +0100
From: "hch@....de" <hch@....de>
To: Bart Van Assche <Bart.VanAssche@...disk.com>
Cc: linux-scsi@...r.kernel.org, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] qla2xxx: Fix a recently introduced memory leak
On Wed, Jan 25, 2017 at 03:47:20PM +0000, Bart Van Assche wrote:
> =============================================================================
> BUG kmalloc-16 (Not tainted): Redzone overwritten
> -----------------------------------------------------------------------------
>
> Disabling lock debugging due to kernel taint
> INFO: 0xffff880030bacc78-0xffff880030bacc7f. First byte 0xf instead of 0xcc
> INFO: Allocated in irq_create_affinity_masks+0x5f/0x260 age=0 cpu=3 pid=812
> ___slab_alloc.constprop.79+0x482/0x4f0
> __slab_alloc.isra.75.constprop.78+0x55/0xa0
> __kmalloc+0x27c/0x310
> irq_create_affinity_masks+0x5f/0x260
This is the normal affinity mask allocation.
> __pci_enable_msix+0x314/0x4c0
> pci_alloc_irq_vectors_affinity+0xb7/0x140
> qla2x00_request_irqs+0xa6/0x6d0 [qla2xxx]
> qla2x00_probe_one+0xc2e/0x25f0 [qla2xxx]
> pci_device_probe+0x8a/0xf0
> driver_probe_device+0x1f5/0x450
> __driver_attach+0xe3/0xf0
> bus_for_each_dev+0x66/0xa0
> driver_attach+0x1e/0x20
> bus_add_driver+0x200/0x270
> driver_register+0x60/0xe0
> __pci_register_driver+0x5d/0x60
> INFO: Freed in acpi_ns_get_node_unlocked+0x90/0xa4 age=0 cpu=3 pid=812
> __slab_free+0x176/0x310
> kfree+0x25e/0x2d0
> acpi_ns_get_node_unlocked+0x90/0xa4
> acpi_ns_get_node+0x3d/0x52
> acpi_get_handle+0x82/0x96
This on the other hand I don't understand acpi_ns_get_node_unlocked
only frees the object it allocated in the ACPI code using
acpi_ns_internalize_name. I can't really see any relation to the
affinity mask allocation.
> acpi_pci_irq_find_prt_entry+0x26e/0x2ae
> acpi_pci_irq_lookup+0x28/0x135
> acpi_pci_irq_enable+0x60/0x1f8
> pcibios_enable_device+0x2d/0x30
> do_pci_enable_device+0x64/0xf0
> pci_enable_device_flags+0xc5/0x110
> pci_enable_device_mem+0x13/0x20
> qla2x00_probe_one+0x14b/0x25f0 [qla2xxx]
> pci_device_probe+0x8a/0xf0
> driver_probe_device+0x1f5/0x450
> __driver_attach+0xe3/0xf0
> INFO: Slab 0xffffea0000c2eb00 objects=23 used=21 fp=0xffff880030bacdc8 flags=0x4000000000008101
> INFO: Object 0xffff880030bacc68 @offset=3176 fp=0xffff880030bacf28
>
> Redzone ffff880030bacc60: cc cc cc cc cc cc cc cc ........
> Object ffff880030bacc68: ff 00 00 00 00 00 00 00 ff 00 00 00 00 00 00 00 ................
> Redzone ffff880030bacc78: 0f 00 00 00 00 00 00 00 ........
> Padding ffff880030bacdb8: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
> CPU: 3 PID: 812 Comm: modprobe Tainted: G B 4.10.0-rc5-dbg+ #9
> Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
> Call Trace:
> dump_stack+0x85/0xc2
> print_trailer+0x162/0x260
> check_bytes_and_report+0xc5/0x110
> check_object+0x1da/0x2a0
> free_debug_processing+0x161/0x3d0
> ? debug_lockdep_rcu_enabled+0x1d/0x20
> ? __pci_enable_msix+0x41c/0x4c0
> __slab_free+0x176/0x310
> ? __pci_enable_msix+0x41c/0x4c0
> ? call_rcu+0x17/0x20
> ? kfree+0xe7/0x2d0
> ? __pci_enable_msix+0x41c/0x4c0
> ? __pci_enable_msix+0x41c/0x4c0
> kfree+0x25e/0x2d0
> __pci_enable_msix+0x41c/0x4c0
> pci_alloc_irq_vectors_affinity+0xb7/0x140
> qla2x00_request_irqs+0xa6/0x6d0 [qla2xxx]
> qla2x00_probe_one+0xc2e/0x25f0 [qla2xxx]
> ? __pm_runtime_resume+0x40/0x80
> ? trace_hardirqs_on_caller+0x128/0x1b0
> ? trace_hardirqs_on+0xd/0x10
> ? _raw_spin_unlock_irqrestore+0x4a/0x80
> pci_device_probe+0x8a/0xf0
> driver_probe_device+0x1f5/0x450
> __driver_attach+0xe3/0xf0
> ? driver_probe_device+0x450/0x450
> bus_for_each_dev+0x66/0xa0
> driver_attach+0x1e/0x20
> bus_add_driver+0x200/0x270
> ? 0xffffffffa04eb000
> driver_register+0x60/0xe0
> ? 0xffffffffa04eb000
> __pci_register_driver+0x5d/0x60
> qla2x00_module_init+0x1c9/0x217 [qla2xxx]
> do_one_initcall+0x44/0x180
> ? rcu_read_lock_sched_held+0x72/0x80
> ? kmem_cache_alloc_trace+0x25b/0x2c0
> ? do_init_module+0x27/0x1f9
> do_init_module+0x5f/0x1f9
> load_module+0x2582/0x2a00
> ? __symbol_put+0x70/0x70
> ? kernel_read_file+0x10a/0x1a0
> ? kernel_read_file_from_fd+0x49/0x80
> SYSC_finit_module+0xbc/0xf0
> SyS_finit_module+0xe/0x10
> entry_SYSCALL_64_fastpath+0x23/0xc6
> RIP: 0033:0x7f05711388e9
> RSP: 002b:00007fff51d4a0f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f05711388e9
> RDX: 0000000000000000 RSI: 000055c17ab4f720 RDI: 0000000000000004
> RBP: 00007fff51d49100 R08: 0000000000000000 R09: 0000000000000019
> R10: 0000000000000004 R11: 0000000000000246 R12: 000055c17ab4f570
> R13: 00007fff51d490e0 R14: 0000000000000005 R15: 0000000000040000
> FIX kmalloc-16: Restoring 0xffff880030bacc78-0xffff880030bacc7f=0xcc
>
> FIX kmalloc-16: Object at 0xffff880030bacc68 not freed
> scsi host2: qla2xxx
> qla2xxx [0000:00:09.0]-00fb:2: QLogic QLE2460 - QLogic 4GB FC Single-Port PCI-E HBA for IBM System x.
> qla2xxx [0000:00:09.0]-00fc:2: ISP2432: PCIe (2.5GT/s x4) @ 0000:00:09.0 hdma- host#=2 fw=8.03.00 (9496).
> qla2xxx [0000:00:0a.0]-001d: : Found an ISP2432 irq 10 iobase 0xffffc900000ad000.
> =============================================================================
> BUG kmalloc-16 (Tainted: G B ): Redzone overwritten
> -----------------------------------------------------------------------------
>
> INFO: 0xffff88006ff18dd8-0xffff88006ff18ddf. First byte 0xf instead of 0xcc
> INFO: Allocated in irq_create_affinity_masks+0x5f/0x260 age=0 cpu=2 pid=812
> ___slab_alloc.constprop.79+0x482/0x4f0
> __slab_alloc.isra.75.constprop.78+0x55/0xa0
> __kmalloc+0x27c/0x310
> irq_create_affinity_masks+0x5f/0x260
> __pci_enable_msix+0x314/0x4c0
> pci_alloc_irq_vectors_affinity+0xb7/0x140
> qla2x00_request_irqs+0xa6/0x6d0 [qla2xxx]
> qla2x00_probe_one+0xc2e/0x25f0 [qla2xxx]
> pci_device_probe+0x8a/0xf0
> driver_probe_device+0x1f5/0x450
> __driver_attach+0xe3/0xf0
> bus_for_each_dev+0x66/0xa0
> driver_attach+0x1e/0x20
> bus_add_driver+0x200/0x270
> driver_register+0x60/0xe0
> __pci_register_driver+0x5d/0x60
> INFO: Freed in acpi_ns_get_node_unlocked+0x90/0xa4 age=1 cpu=2 pid=812
> __slab_free+0x176/0x310
> kfree+0x25e/0x2d0
> acpi_ns_get_node_unlocked+0x90/0xa4
> acpi_ns_get_node+0x3d/0x52
> acpi_get_handle+0x82/0x96
> acpi_pci_irq_find_prt_entry+0x26e/0x2ae
> acpi_pci_irq_lookup+0x28/0x135
> acpi_pci_irq_enable+0x60/0x1f8
> pcibios_enable_device+0x2d/0x30
> do_pci_enable_device+0x64/0xf0
> pci_enable_device_flags+0xc5/0x110
> pci_enable_device_mem+0x13/0x20
> qla2x00_probe_one+0x14b/0x25f0 [qla2xxx]
> pci_device_probe+0x8a/0xf0
> driver_probe_device+0x1f5/0x450
> __driver_attach+0xe3/0xf0
> INFO: Slab 0xffffea0001bfc600 objects=23 used=22 fp=0xffff88006ff18f28 flags=0x4000000000008101
> INFO: Object 0xffff88006ff18dc8 @offset=3528 fp=0xffff88006ff18f28
>
> Redzone ffff88006ff18dc0: cc cc cc cc cc cc cc cc ........
> Object ffff88006ff18dc8: ff 00 00 00 00 00 00 00 ff 00 00 00 00 00 00 00 ................
> Redzone ffff88006ff18dd8: 0f 00 00 00 00 00 00 00 ........
> Padding ffff88006ff18f18: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
> CPU: 2 PID: 812 Comm: modprobe Tainted: G B 4.10.0-rc5-dbg+ #9
> Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
> Call Trace:
> dump_stack+0x85/0xc2
> print_trailer+0x162/0x260
> check_bytes_and_report+0xc5/0x110
> check_object+0x1da/0x2a0
> free_debug_processing+0x161/0x3d0
> ? __pci_enable_msix+0x41c/0x4c0
> __slab_free+0x176/0x310
> ? __pci_enable_msix+0x41c/0x4c0
> ? call_rcu+0x17/0x20
> ? put_object+0x2d/0x50
> ? __delete_object+0x3d/0x70
> ? __pci_enable_msix+0x41c/0x4c0
> kfree+0x25e/0x2d0
> __pci_enable_msix+0x41c/0x4c0
> pci_alloc_irq_vectors_affinity+0xb7/0x140
> qla2x00_request_irqs+0xa6/0x6d0 [qla2xxx]
> qla2x00_probe_one+0xc2e/0x25f0 [qla2xxx]
> ? __pm_runtime_resume+0x40/0x80
> ? trace_hardirqs_on+0xd/0x10
> ? _raw_spin_unlock_irqrestore+0x4a/0x80
> pci_device_probe+0x8a/0xf0
> driver_probe_device+0x1f5/0x450
> __driver_attach+0xe3/0xf0
> ? driver_probe_device+0x450/0x450
> bus_for_each_dev+0x66/0xa0
> driver_attach+0x1e/0x20
> bus_add_driver+0x200/0x270
> ? 0xffffffffa04eb000
> driver_register+0x60/0xe0
> ? 0xffffffffa04eb000
> __pci_register_driver+0x5d/0x60
> qla2x00_module_init+0x1c9/0x217 [qla2xxx]
> do_one_initcall+0x44/0x180
> ? rcu_read_lock_sched_held+0x72/0x80
> ? kmem_cache_alloc_trace+0x25b/0x2c0
> ? do_init_module+0x27/0x1f9
> do_init_module+0x5f/0x1f9
> load_module+0x2582/0x2a00
> ? __symbol_put+0x70/0x70
> ? kernel_read_file+0x10a/0x1a0
> ? kernel_read_file_from_fd+0x49/0x80
> SYSC_finit_module+0xbc/0xf0
> SyS_finit_module+0xe/0x10
> entry_SYSCALL_64_fastpath+0x23/0xc6
> RIP: 0033:0x7f05711388e9
> RSP: 002b:00007fff51d4a0f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f05711388e9
> RDX: 0000000000000000 RSI: 000055c17ab4f720 RDI: 0000000000000004
> RBP: 00007fff51d49100 R08: 0000000000000000 R09: 0000000000000019
> R10: 0000000000000004 R11: 0000000000000246 R12: 000055c17ab4f570
> R13: 00007fff51d490e0 R14: 0000000000000005 R15: 0000000000040000
> FIX kmalloc-16: Restoring 0xffff88006ff18dd8-0xffff88006ff18ddf=0xcc
>
> FIX kmalloc-16: Object at 0xffff88006ff18dc8 not freed
> scsi host3: qla2xxx
> qla2xxx [0000:00:09.0]-500a:2: LOOP UP detected (4 Gbps).
> qla2xxx [0000:00:0a.0]-500a:3: LOOP UP detected (4 Gbps).
>
>
> (gdb) list *(__pci_enable_msix+0x314)
> 0xffffffff8131aa74 is in __pci_enable_msix (drivers/pci/msi.c:702).
> 697 struct msi_desc *entry;
> 698 int ret, i;
> 699
> 700 if (affd) {
> 701 masks = irq_create_affinity_masks(nvec, affd);
> 702 if (!masks)
> 703 pr_err("Unable to allocate affinity masks, ignoring\n");
> 704 }
> 705
> 706 for (i = 0, curmsk = masks; i < nvec; i++) {
> (gdb) list *(__pci_enable_msix+0x41c)
> 0xffffffff8131ab7c is in __pci_enable_msix (drivers/pci/msi.c:783).
> 778
> 779 ret = msix_setup_entries(dev, base, entries, nvec, affd);
> 780 if (ret)
> 781 return ret;
> 782
> 783 ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
> 784 if (ret)
> 785 goto out_avail;
> 786
> 787 /* Check if all MSI entries honor device restrictions */
> (gdb) quit---end quoted text---
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