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Subject[RFC PATCH] iommu/amd: fix a race in increase_address_space()
Date
When the system is under some memory pressure, it could cause disks on
the "smartpqi" driver going offline below. From the UBSAN report, it
indicates that "domain->mode" becomes 7. Further investigation indicates
that the only place that would increase "domain->mode" is
increase_address_space() but it has this check before actually
increasing it,

if (domain->mode == PAGE_MODE_6_LEVEL)
/* address space already 64 bit large */
return false;

This gives a clue that there must be a race between multiple concurrent
threads in increase_address_space().

In amd_iommu_map() and amd_iommu_unmap(), there is
mutex_lock() and mutex_unlock() around a iommu_map_page(). There are
several places that could call iommu_map_page() with interrupt enabled.
One for sure is alloc_coherent() which call __map_single() that had a
comment said that it needs to hold a lock but not so. I am not sure
about the map_page() and map_sg() where my investigation so far
indicating that many call sites there are in the atomic context.

smartpqi 0000:23:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0000
address=0xff702a00 flags=0x0010]
UBSAN: Undefined behaviour in drivers/iommu/amd_iommu.c:1464:29
shift exponent 66 is too large for 64-bit type 'long unsigned int'
CPU: 39 PID: 821 Comm: kswapd4 Tainted: G O
5.3.0-rc7-next-20190903+ #4
Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40
07/10/2019
Call Trace:
dump_stack+0x62/0x9a
ubsan_epilogue+0xd/0x3a
smartpqi 0000:23:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0000
address=0xff702c80 flags=0x0010]
__ubsan_handle_shift_out_of_bounds.cold.12+0x21/0x68
iommu_map_page.cold.39+0x7f/0x84
map_sg+0x1ce/0x2f0
scsi_dma_map+0xc6/0x160
pqi_raid_submit_scsi_cmd_with_io_request+0x1c3/0x470 [smartpqi]
smartpqi 0000:23:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0000
address=0xff702900 flags=0x0010]
pqi_scsi_queue_command+0x7d6/0xeb0 [smartpqi]
scsi_queue_rq+0x7ee/0x12b0
__blk_mq_try_issue_directly+0x295/0x3f0
blk_mq_try_issue_directly+0xad/0x130
blk_mq_make_request+0xb12/0xee0
generic_make_request+0x179/0x4a0
submit_bio+0xaa/0x270
__swap_writepage+0x8f5/0xba0
swap_writepage+0x65/0xb0
pageout.isra.3+0x3e5/0xa00
shrink_page_list+0x15a0/0x2660
shrink_inactive_list+0x373/0x770
shrink_node_memcg+0x4ff/0x1550
shrink_node+0x123/0x800
balance_pgdat+0x493/0x9b0
kswapd+0x39b/0x7f0
kthread+0x1df/0x200
ret_from_fork+0x22/0x40
========================================================================
smartpqi 0000:23:00.0: resetting scsi 0:1:0:0
INFO: task khugepaged:797 blocked for more than 122 seconds.
Tainted: G O 5.3.0-rc7-next-20190903+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
khugepaged D22656 797 2 0x80004000
Call Trace:
__schedule+0x4bb/0xc20
schedule+0x6c/0x140
io_schedule+0x21/0x50
rq_qos_wait+0x18e/0x2b0
wbt_wait+0x12b/0x1b0
__rq_qos_throttle+0x3b/0x60
blk_mq_make_request+0x217/0xee0
generic_make_request+0x179/0x4a0
submit_bio+0xaa/0x270
__swap_writepage+0x8f5/0xba0
swap_writepage+0x65/0xb0
pageout.isra.3+0x3e5/0xa00
shrink_page_list+0x15a0/0x2660
shrink_inactive_list+0x373/0x770
shrink_node_memcg+0x4ff/0x1550
shrink_node+0x123/0x800
do_try_to_free_pages+0x22f/0x820
try_to_free_pages+0x242/0x4d0
__alloc_pages_nodemask+0x9f6/0x1bb0
khugepaged_alloc_page+0x6f/0xf0
collapse_huge_page+0x103/0x1060
khugepaged_scan_pmd+0x840/0xa70
khugepaged+0x1571/0x18d0
kthread+0x1df/0x200
ret_from_fork+0x22/0x40
INFO: task systemd-journal:3112 blocked for more than 123 seconds.
Tainted: G O 5.3.0-rc7-next-20190903+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
systemd-journal D20744 3112 1 0x00004120
Call Trace:
__do_page_cache_readahead+0x149/0x3a0
filemap_fault+0x9da/0x1050
__xfs_filemap_fault+0x167/0x450 [xfs]
xfs_filemap_fault+0x68/0x70 [xfs]
__do_fault+0x83/0x220
__handle_mm_fault+0x1034/0x1a50
handle_mm_fault+0x17f/0x37e
__do_page_fault+0x369/0x630
do_page_fault+0x50/0x2d3
page_fault+0x2f/0x40
RIP: 0033:0x56088e81faa0
Code: Bad RIP value.
RSP: 002b:00007ffdc2158ba8 EFLAGS: 000102_iter+0x135/0x850
shrink_node+0x123/0x800
do_try_to_free_pages+0x22f/0x820
try_to_free_pages+0x242/0x4d0
__alloc_pages_nodemask+0x9f6/0x1bb0
[11967.13967 __swap_writepage+0x8f5/0xba0
swap_writepage+0x65/0xb0
pageout.isra.3+0x3e5/0xa00
shrink_page_list+0x15a0/0x2660
io_schedule+0x21/0x50
rq_qos_wait+0x18e/0x2b0
wbt_wait+0x12b/0x1b0
__rq_qos_throttle+0x3b/0x60
blk_mq_make_request+0x217/0xee0
schedule+0x6c/0x140
io_schedule+0x21/0x50
rq_qos_wait+0x18e/0x2b0
wbt_wait+0x12b/0x1b0
__rq_qos_throttle+0x3b/0x60
blk_mq_make_request+0x217/0xee0
[11968.69198.0+0x60/0x60
swap_writepage+0x65/0xb0
pageout.isra.3+0x3e5/0xa00
shrink_page_list+0x15a0/0x2660
generic_make_request+0x179/0x4a0
submit_bio+0xaa/0x270
__swap_writepage+0x8f5/0xba0
swap_writepage+0x65/0xb0
pageout.isra.3+0x3e5/0xa00
__swap_writepage+0x8f5/0xba0
swap_writepage+0x65/0xb0
pageout.isra.3+0x3e5/0xa00
shrink_page_list+0x15a0/0x2660
wbt_wait+0x12b/0x1b0
__rq_qos_throttle+0x3b/0x60
blk_mq_make_request+0x217/0xee0
generic_make_request+0x179/0x4a0
submit_bio+0xaa/0x270
__swap_writepage+0x8f5/0xba0
1 lock held by khungtaskd/791:
#0: ffffffffa1b8b360 (rcu_read_lock){....}, at:
debug_show_all_locks+0x33/0x16a
1 lock held by khugepaged/797:
#0: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by kswapd0/820:
#0: ffffffffa1cc55c0 (fs_reclaim){....}, at:
__fs_reclaim_acquire+0x5/0x30
#1: ffff88846fa43538 (&md->io_barrier){....}, at:
dm_get_live_table+0x5/0x70 [dm_mod]
2 locks held by kswapd4/821:
#0: ffffffffa1cc55c0 (fs_reclaim){....}, at:
__fs_reclaim_acquire+0x5/0x30
#1: ffff88846fa43538 (&md->io_barrier){....}, at:
dm_get_live_table+0x5/0x70 [dm_mod]
1 lock held by scsi_eh_0/1577:
#0: ffff8884cb52cca0 (&ctrl_info->lun_reset_mutex){....}, at:
pqi_eh_device_reset_handler+0x313/0x970 [smartpqi]
[11acquire.part.15+0x5/0x30
2 locks held by oom01/121253:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121254:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121255:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121256:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
[11971.6650x5/0x30
2 locks held by oom01/121278:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121279:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121280:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121281:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acqfffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121299:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121300:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121301:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121302:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, 2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121320:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121321:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121322:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121323:
#0: ffff888338118840 (&om01/121340:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121341:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121342:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121343:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121366:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121367:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121368:
#0: ffff888338118840 (&mm->mmap_sem#2){....}, at:
__do_page_fault+0x18e/0x630
#1: ffffffffa1cc55c0 (fs_reclaim){....}, at:
fs_reclaim_acquire.part.15+0x5/0x30
2 locks held by oom01/121369:
smartpqi 0000:23:00.0: no heartbeat detected - last heartbeat count:
11794
smartpqi 0000:23:00.0: controller offline
smartpqi 0000:23:00.0: reset of scsi 0:1:0:0: FAILED
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
========================================================================
sd 0:1:0:0: Device offlined - not ready after error recovery
UBSAN: Undefined behaviour in drivers/iommu/amd_iommu.c:1526:28
shift exponent 66 is too large for 64-bit type 'long unsigned int'
CPU: 8 PID: 49038 Comm: kworker/8:0 Tainted: G O
5.3.0-rc7-next-20190903+ #4
Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40
07/10/2019
sd 0:1:0:0: Device offlined - not ready after error recovery
Workqueue: events pqi_ctrl_offline_worker [smartpqi]
sd 0:1:0:0: Device offlined - not ready after error recovery
Call Trace:
dump_stack+0x62/0x9a
ubsan_epilogue+0xd/0x3a
sd 0:1:0:0: Device offlined - not ready after error recovery
__ubsan_handle_shift_out_of_bounds.cold.12+0x21/0x68
fetch_pte.cold.23+0x9c/0xcf
iommu_unmap_page+0xcd/0x180
sd 0:1:0:0: Device offlined - not ready after error recovery
__unmap_single.isra.18+0x6a/0x120
unmap_sg+0x74/0x90
scsi_dma_unmap+0xdc/0x140
sd 0:1:0:0: Device offlined - not ready after error recovery
pqi_raid_io_complete+0x2d/0x60 [smartpqi]
pqi_ctrl_offline_worker+0x128/0x270 [smartpqi]
sd 0:1:0:0: Device offlined - not ready after error recovery
process_one_work+0x53b/0xa70
worker_thread+0x63/0x5b0
kthread+0x1df/0x200
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
ret_from_fork+0x22/0x40
sd 0:1:0:0: Device offlined - not ready after error recovery
========================================================================
sd 0:1:0:0: Device offlined - not ready after error recovery
========================================================================
sd 0:1:0:0: Device offlined - not ready after error recovery
UBSAN: Undefined behaviour in drivers/iommu/amd_iommu.c:1527:16
shift exponent 66 is too large for 64-bit type 'long long unsigned int'
CPU: 8 PID: 49038 Comm: kworker/8:0 Tainted: G O
5.3.0-rc7-next-20190903+ #4
sd 0:1:0:0: Device offlined - not ready after error recovery
Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40
07/10/2019
Workqueue: events pqi_ctrl_offline_worker [smartpqi]
Call Trace:
dump_stack+0x62/0x9a
sd 0:1:0:0: Device offlined - not ready after error recovery
ubsan_epilogue+0xd/0x3a
sd 0:1:0:0: Device offlined - not ready after error recovery
__ubsan_handle_shift_out_of_bounds.cold.12+0x21/0x68
sd 0:1:0:0: Device offlined - not ready after error recovery
fetch_pte.cold.23+0xca/0xcf
iommu_unmap_page+0xcd/0x180
__unmap_single.isra.18+0x6a/0x120
sd 0:1:0:0: Device offlined - not ready after error recovery
unmap_sg+0x74/0x90
sd 0:1:0:0: Device offlined - not ready after error recovery
scsi_dma_unmap+0xdc/0x140
pqi_raid_io_complete+0x2d/0x60 [smartpqi]
pqi_ctrl_offline_worker+0x128/0x270 [smartpqi]
sd 0:1:0:0: Device offlined - not ready after error recovery
process_one_work+0x53b/0xa70
worker_thread+0x63/0x5b0
kthread+0x1df/0x200
sd 0:1:0:0: Device offlined - not ready after error recovery
sd 0:1:0:0: Device offlined - not ready after error recovery
ret_from_fork+0x22/0x40
========================================================================
sd 0:1:0:0: rejecting I/O to offline device
sd 0:1:0:0: Device offlined - not ready after error recovery
blk_update_request: I/O error, dev sda, 43208)
Write-error on swap-device (254:1:29843216)
Write-error on swap-device (254:1:29843224)
Write-error on swap-device (254:1:29843232)
Write-error on swap-device (254:1:29843240)
---
drivers/iommu/amd_iommu.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b607a92791d3..3874a0f5e197 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2660,8 +2660,10 @@ static void *alloc_coherent(struct device *dev, size_t size,
if (!dma_mask)
dma_mask = *dev->dma_mask;

+ mutex_lock(&domain->api_lock);
*dma_addr = __map_single(dev, dma_dom, page_to_phys(page),
size, DMA_BIDIRECTIONAL, dma_mask);
+ mutex_unlock(&domain->api_lock);

if (*dma_addr == DMA_MAPPING_ERROR)
goto out_free;
@@ -2696,7 +2698,9 @@ static void free_coherent(struct device *dev, size_t size,

dma_dom = to_dma_ops_domain(domain);

+ mutex_lock(&domain->api_lock);
__unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL);
+ mutex_unlock(&domain->api_lock);

free_mem:
if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
--
1.8.3.1
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