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linux-6.15.y
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Jinjiang Tu 09fc018f48 mm/smaps: fix race between smaps_hugetlb_range and migration 
[ Upstream commit 45d19b4b6c ]

smaps_hugetlb_range() handles the pte without holdling ptl, and may be
concurrenct with migration, leaing to BUG_ON in pfn_swap_entry_to_page().
The race is as follows.

smaps_hugetlb_range              migrate_pages
  huge_ptep_get
                                   remove_migration_ptes
				   folio_unlock
  pfn_swap_entry_folio
    BUG_ON

To fix it, hold ptl lock in smaps_hugetlb_range().

Link: https://lkml.kernel.org/r/20250724090958.455887-1-tujinjiang@huawei.com
Link: https://lkml.kernel.org/r/20250724090958.455887-2-tujinjiang@huawei.com
Fixes: 25ee01a2fc ("mm: hugetlb: proc: add hugetlb-related fields to /proc/PID/smaps")
Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andrei Vagin <avagin@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Brahmajit Das <brahmajit.xyz@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Rientjes <rientjes@google.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Joern Engel <joern@logfs.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-08-20 18:35:47 +02:00
..
array.c
fs/proc: do_task_stat: Fix ESP not readable during coredump
2025-01-04 10:12:18 +01:00
base.c
Merge tag 'mm-nonmm-stable-2025-03-30-18-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-04-01 10:06:52 -07:00
bootconfig.c
fs/proc: Skip bootloader comment if no embedded kernel parameters
2024-04-09 23:36:18 +09:00
cmdline.c
proc: mark /proc/cmdline as permanent
2023-02-02 22:50:02 -08:00
consoles.c
proc: Add nbcon support for /proc/consoles
2024-09-04 15:56:33 +02:00
cpuinfo.c
…
devices.c
…
fd.c
Pass parent directory inode and expected name to ->d_revalidate()
2025-01-27 19:25:23 -05:00
fd.h
fs: port ->permission() to pass mnt_idmap
2023-01-19 09:24:28 +01:00
generic.c
proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al
2025-08-15 12:16:44 +02:00
inode.c
proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al
2025-08-15 12:16:44 +02:00
internal.h
proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al
2025-08-15 12:16:44 +02:00
interrupts.c
fs/procfs: Switch to irq_get_nr_irqs()
2024-10-16 21:56:59 +02:00
Kconfig
virtio-mem: support CONFIG_PROC_VMCORE_DEVICE_RAM
2025-01-27 09:39:25 -05:00
kcore.c
crash: Use note name macros
2025-02-10 16:56:58 -08:00
kmsg.c
…
loadavg.c
…
Makefile
kbuild: make -Woverride-init warnings more consistent
2024-03-31 11:32:26 +09:00
meminfo.c
meminfo: add a per node counter for balloon drivers
2025-03-21 22:03:13 -07:00
namespaces.c
vfs: support caching symlink lengths in inodes
2024-12-22 11:29:50 +01:00
nommu.c
fs: create helper file_user_path() for user displayed mapped file path
2023-10-19 11:03:15 +02:00
page.c
fs/proc/page: remove per-page mapcount dependency for /proc/kpagecount (CONFIG_NO_PAGE_MAPCOUNT)
2025-03-17 22:06:47 -07:00
proc_net.c
fs: Add kernel-doc comments to proc_create_net_data_write()
2024-03-26 09:01:18 +01:00
proc_sysctl.c
fix proc_sys_compare() handling of in-lookup dentries
2025-07-17 18:43:39 +02:00
proc_tty.c
…
root.c
procfs: make freeing proc_fs_info rcu-delayed
2024-02-25 02:10:32 -05:00
self.c
proc: convert to new timestamp accessors
2023-10-18 14:08:26 +02:00
softirqs.c
proc/softirqs: replace seq_printf with seq_put_decimal_ull_width
2024-11-07 07:40:14 -10:00
stat.c
fs/procfs: Switch to irq_get_nr_irqs()
2024-10-16 21:56:59 +02:00
task_mmu.c
mm/smaps: fix race between smaps_hugetlb_range and migration
2025-08-20 18:35:47 +02:00
task_nommu.c
Merge tag 'vfs-6.7.misc' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs
2023-10-30 09:14:19 -10:00
thread_self.c
proc: convert to new timestamp accessors
2023-10-18 14:08:26 +02:00
uptime.c
…
util.c
…
version.c
…
vmcore.c
procfs: fix a locking bug in a vmcore_add_device_dump() error path
2025-02-17 22:40:00 -08:00