[moderation] [media?] [dri?] KASAN: slab-use-after-free Read in dma_buf_fd
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syzbot
3:29 AM (4 hours ago) 3:29 AM
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Hello,
syzbot found the following issue on:
HEAD commit: 5ee8dbf54602 Merge tag 'fsverity-for-linus' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=143e4a02580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2a019678b1a3a692
dashboard link: https://syzkaller.appspot.com/bug?extid=575feff40f8d7647d0e1
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [christia...@amd.com dri-...@lists.freedesktop.org linaro...@lists.linaro.org linux-...@vger.kernel.org linux...@vger.kernel.org sumit....@linaro.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8f3ca4731c70/disk-5ee8dbf5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9e6d67fcdf59/vmlinux-5ee8dbf5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dd6699ad586c/bzImage-5ee8dbf5.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+575fef...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
Read of size 1 at addr ffff888034d9c068 by task syz.6.794/10028
CPU: 1 UID: 0 PID: 10028 Comm: syz.6.794 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x79/0x2e0 kernel/locking/lockdep.c:5842
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
rt_mutex_slowunlock+0xbf/0x8b0 kernel/locking/rtmutex.c:1417
spin_unlock include/linux/spinlock_rt.h:109 [inline]
class_spinlock_destructor include/linux/spinlock.h:586 [inline]
dma_buf_fd+0x189/0x370 drivers/dma-buf/dma-buf.c:796
vb2_core_expbuf+0x37e/0x620 drivers/media/common/videobuf2/videobuf2-core.c:2471
__video_do_ioctl+0x88c/0xc50 drivers/media/v4l2-core/v4l2-ioctl.c:3132
video_usercopy+0x876/0x14b0 drivers/media/v4l2-core/v4l2-ioctl.c:3474
v4l2_ioctl+0x190/0x1e0 drivers/media/v4l2-core/v4l2-dev.c:366
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa4633cc799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa46161e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa463645fa0 RCX: 00007fa4633cc799
RDX: 0000200000000040 RSI: 00000000c0405610 RDI: 0000000000000004
RBP: 00007fa463462bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa463646038 R14: 00007fa463645fa0 R15: 00007ffe4429d3d8
</TASK>
Allocated by task 10028:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5238 [inline]
__kmalloc_noprof+0x3e7/0x7b0 mm/slub.c:5250
kmalloc_noprof include/linux/slab.h:954 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
dma_buf_export+0x3ba/0xb10 drivers/dma-buf/dma-buf.c:739
vb2_vmalloc_get_dmabuf+0x10e/0x210 drivers/media/common/videobuf2/videobuf2-vmalloc.c:352
vb2_core_expbuf+0x314/0x620 drivers/media/common/videobuf2/videobuf2-core.c:2461
__video_do_ioctl+0x88c/0xc50 drivers/media/v4l2-core/v4l2-ioctl.c:3132
video_usercopy+0x876/0x14b0 drivers/media/v4l2-core/v4l2-ioctl.c:3474
v4l2_ioctl+0x190/0x1e0 drivers/media/v4l2-core/v4l2-dev.c:366
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 10031:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2692 [inline]
slab_free mm/slub.c:6143 [inline]
kfree+0x1c1/0x6c0 mm/slub.c:6461
__dentry_kill+0x211/0x5e0 fs/dcache.c:675
finish_dput+0xc9/0x480 fs/dcache.c:879
__fput+0x6a3/0xa90 fs/file_table.c:477
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888034d9c000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 104 bytes inside of
freed 1024-byte region [ffff888034d9c000, ffff888034d9c400)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34d98
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88813fe1cdc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 0080000000000040 ffff88813fe1cdc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 0080000000000003 ffffea0000d36601 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6221, tgid 6216 (syz.3.71), ts 173025510293, free_ts 172769017733
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3269 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3458
new_slab mm/slub.c:3516 [inline]
refill_objects+0x334/0x3c0 mm/slub.c:7153
refill_sheaf mm/slub.c:2818 [inline]
__pcs_replace_empty_main+0x328/0x5f0 mm/slub.c:4592
alloc_from_pcs mm/slub.c:4695 [inline]
slab_alloc_node mm/slub.c:4829 [inline]
__kmalloc_cache_noprof+0x44e/0x690 mm/slub.c:5353
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
snd_seq_oss_open+0x125/0xfc0 sound/core/seq/oss/seq_oss_init.c:171
odev_open+0x67/0xd0 sound/core/seq/oss/seq_oss.c:128
chrdev_open+0x4d0/0x5f0 fs/char_dev.c:411
do_dentry_open+0x83d/0x13e0 fs/open.c:949
vfs_open+0x3b/0x350 fs/open.c:1081
do_open fs/namei.c:4671 [inline]
path_openat+0x2e43/0x38a0 fs/namei.c:4830
do_file_open+0x23e/0x4a0 fs/namei.c:4859
do_sys_openat2+0x113/0x200 fs/open.c:1366
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1383
page last free pid 6219 tgid 6219 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xfe3/0x1170 mm/page_alloc.c:2978
__slab_free+0x24f/0x2a0 mm/slub.c:5551
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4515 [inline]
slab_alloc_node mm/slub.c:4844 [inline]
kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4851
vm_area_dup+0x2b/0x670 mm/vma_init.c:123
__split_vma+0x1e4/0xa30 mm/vma.c:513
split_vma mm/vma.c:596 [inline]
vma_modify+0x94b/0x1f00 mm/vma.c:1672
vma_modify_flags+0x24b/0x330 mm/vma.c:1700
mprotect_fixup+0x47a/0xa80 mm/mprotect.c:756
do_mprotect_pkey+0x8ab/0xcd0 mm/mprotect.c:930
__do_sys_mprotect mm/mprotect.c:951 [inline]
__se_sys_mprotect mm/mprotect.c:948 [inline]
__x64_sys_mprotect+0x80/0x90 mm/mprotect.c:948
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888034d9bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888034d9bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888034d9c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888034d9c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888034d9c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
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syzbot found the following issue on:
HEAD commit: 5ee8dbf54602 Merge tag 'fsverity-for-linus' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=143e4a02580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2a019678b1a3a692
dashboard link: https://syzkaller.appspot.com/bug?extid=575feff40f8d7647d0e1
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [christia...@amd.com dri-...@lists.freedesktop.org linaro...@lists.linaro.org linux-...@vger.kernel.org linux...@vger.kernel.org sumit....@linaro.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8f3ca4731c70/disk-5ee8dbf5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9e6d67fcdf59/vmlinux-5ee8dbf5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dd6699ad586c/bzImage-5ee8dbf5.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+575fef...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
Read of size 1 at addr ffff888034d9c068 by task syz.6.794/10028
CPU: 1 UID: 0 PID: 10028 Comm: syz.6.794 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x79/0x2e0 kernel/locking/lockdep.c:5842
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162
rt_mutex_slowunlock+0xbf/0x8b0 kernel/locking/rtmutex.c:1417
spin_unlock include/linux/spinlock_rt.h:109 [inline]
class_spinlock_destructor include/linux/spinlock.h:586 [inline]
dma_buf_fd+0x189/0x370 drivers/dma-buf/dma-buf.c:796
vb2_core_expbuf+0x37e/0x620 drivers/media/common/videobuf2/videobuf2-core.c:2471
__video_do_ioctl+0x88c/0xc50 drivers/media/v4l2-core/v4l2-ioctl.c:3132
video_usercopy+0x876/0x14b0 drivers/media/v4l2-core/v4l2-ioctl.c:3474
v4l2_ioctl+0x190/0x1e0 drivers/media/v4l2-core/v4l2-dev.c:366
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa4633cc799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa46161e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa463645fa0 RCX: 00007fa4633cc799
RDX: 0000200000000040 RSI: 00000000c0405610 RDI: 0000000000000004
RBP: 00007fa463462bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa463646038 R14: 00007fa463645fa0 R15: 00007ffe4429d3d8
</TASK>
Allocated by task 10028:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5238 [inline]
__kmalloc_noprof+0x3e7/0x7b0 mm/slub.c:5250
kmalloc_noprof include/linux/slab.h:954 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
dma_buf_export+0x3ba/0xb10 drivers/dma-buf/dma-buf.c:739
vb2_vmalloc_get_dmabuf+0x10e/0x210 drivers/media/common/videobuf2/videobuf2-vmalloc.c:352
vb2_core_expbuf+0x314/0x620 drivers/media/common/videobuf2/videobuf2-core.c:2461
__video_do_ioctl+0x88c/0xc50 drivers/media/v4l2-core/v4l2-ioctl.c:3132
video_usercopy+0x876/0x14b0 drivers/media/v4l2-core/v4l2-ioctl.c:3474
v4l2_ioctl+0x190/0x1e0 drivers/media/v4l2-core/v4l2-dev.c:366
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 10031:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2692 [inline]
slab_free mm/slub.c:6143 [inline]
kfree+0x1c1/0x6c0 mm/slub.c:6461
__dentry_kill+0x211/0x5e0 fs/dcache.c:675
finish_dput+0xc9/0x480 fs/dcache.c:879
__fput+0x6a3/0xa90 fs/file_table.c:477
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888034d9c000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 104 bytes inside of
freed 1024-byte region [ffff888034d9c000, ffff888034d9c400)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34d98
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88813fe1cdc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 0080000000000040 ffff88813fe1cdc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 0080000000000003 ffffea0000d36601 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6221, tgid 6216 (syz.3.71), ts 173025510293, free_ts 172769017733
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3269 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3458
new_slab mm/slub.c:3516 [inline]
refill_objects+0x334/0x3c0 mm/slub.c:7153
refill_sheaf mm/slub.c:2818 [inline]
__pcs_replace_empty_main+0x328/0x5f0 mm/slub.c:4592
alloc_from_pcs mm/slub.c:4695 [inline]
slab_alloc_node mm/slub.c:4829 [inline]
__kmalloc_cache_noprof+0x44e/0x690 mm/slub.c:5353
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
snd_seq_oss_open+0x125/0xfc0 sound/core/seq/oss/seq_oss_init.c:171
odev_open+0x67/0xd0 sound/core/seq/oss/seq_oss.c:128
chrdev_open+0x4d0/0x5f0 fs/char_dev.c:411
do_dentry_open+0x83d/0x13e0 fs/open.c:949
vfs_open+0x3b/0x350 fs/open.c:1081
do_open fs/namei.c:4671 [inline]
path_openat+0x2e43/0x38a0 fs/namei.c:4830
do_file_open+0x23e/0x4a0 fs/namei.c:4859
do_sys_openat2+0x113/0x200 fs/open.c:1366
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1383
page last free pid 6219 tgid 6219 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xfe3/0x1170 mm/page_alloc.c:2978
__slab_free+0x24f/0x2a0 mm/slub.c:5551
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4515 [inline]
slab_alloc_node mm/slub.c:4844 [inline]
kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4851
vm_area_dup+0x2b/0x670 mm/vma_init.c:123
__split_vma+0x1e4/0xa30 mm/vma.c:513
split_vma mm/vma.c:596 [inline]
vma_modify+0x94b/0x1f00 mm/vma.c:1672
vma_modify_flags+0x24b/0x330 mm/vma.c:1700
mprotect_fixup+0x47a/0xa80 mm/mprotect.c:756
do_mprotect_pkey+0x8ab/0xcd0 mm/mprotect.c:930
__do_sys_mprotect mm/mprotect.c:951 [inline]
__se_sys_mprotect mm/mprotect.c:948 [inline]
__x64_sys_mprotect+0x80/0x90 mm/mprotect.c:948
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888034d9bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888034d9bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888034d9c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888034d9c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888034d9c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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