[syzbot] [fs?] KASAN: slab-use-after-free Read in clone_mnt
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5:01 AM (6 hours ago) 5:01 AM
to bra...@kernel.org, ja...@suse.cz, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, vi...@zeniv.linux.org.uk
Hello,
syzbot found the following issue on:
HEAD commit: c22e26bd0906 Merge tag 'landlock-7.0-rc1' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12c6a6e6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6428d17febdfb14e
dashboard link: https://syzkaller.appspot.com/bug?extid=a89f9434fb5a001ccd58
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b33c549157ca/disk-c22e26bd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/34c7ded19553/vmlinux-c22e26bd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/66faec2158ed/bzImage-c22e26bd.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a89f94...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x4e/0x130 lib/list_debug.c:29
Read of size 8 at addr ffff8880341bcb40 by task syz.6.5169/22925
CPU: 1 UID: 0 PID: 22925 Comm: syz.6.5169 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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
__list_add_valid_or_report+0x4e/0x130 lib/list_debug.c:29
__list_add_valid include/linux/list.h:96 [inline]
__list_add include/linux/list.h:158 [inline]
list_add include/linux/list.h:177 [inline]
clone_mnt+0x447/0x9a0 fs/namespace.c:1275
copy_tree+0xde/0x930 fs/namespace.c:2159
copy_mnt_ns+0x24d/0x990 fs/namespace.c:4246
create_new_namespaces+0xcf/0x6a0 kernel/nsproxy.c:98
unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:226
ksys_unshare+0x4f4/0x900 kernel/fork.c:3174
__do_sys_unshare kernel/fork.c:3245 [inline]
__se_sys_unshare kernel/fork.c:3243 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3243
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: 0033:0x7ff48d79bf79
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:00007ff48b9f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ff48da15fa0 RCX: 00007ff48d79bf79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002a020400
RBP: 00007ff48d8327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff48da16038 R14: 00007ff48da15fa0 R15: 00007ffc92e1ac28
</TASK>
Allocated by task 22855:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4459 [inline]
slab_alloc_node mm/slub.c:4788 [inline]
kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4795
alloc_vfsmnt+0x23/0x420 fs/namespace.c:287
clone_mnt+0x4b/0x9a0 fs/namespace.c:1246
create_new_namespace fs/namespace.c:3098 [inline]
open_new_namespace fs/namespace.c:3168 [inline]
vfs_open_tree+0x507/0x1040 fs/namespace.c:3217
__do_sys_open_tree fs/namespace.c:3227 [inline]
__se_sys_open_tree fs/namespace.c:3225 [inline]
__x64_sys_open_tree+0x96/0x110 fs/namespace.c:3225
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 20:
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:2670 [inline]
slab_free mm/slub.c:6082 [inline]
kmem_cache_free+0x185/0x690 mm/slub.c:6212
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core kernel/rcu/tree.c:2869 [inline]
rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2957
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3131 [inline]
call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
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
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
task_work_add+0xb6/0x440 kernel/task_work.c:70
mntput_no_expire_slowpath+0x70c/0xbd0 fs/namespace.c:1379
create_new_namespace fs/namespace.c:3162 [inline]
open_new_namespace fs/namespace.c:3168 [inline]
vfs_open_tree+0xe17/0x1040 fs/namespace.c:3217
__do_sys_open_tree fs/namespace.c:3227 [inline]
__se_sys_open_tree fs/namespace.c:3225 [inline]
__x64_sys_open_tree+0x96/0x110 fs/namespace.c:3225
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
The buggy address belongs to the object at ffff8880341bca80
which belongs to the cache mnt_cache of size 352
The buggy address is located 192 bytes inside of
freed 352-byte region [ffff8880341bca80, ffff8880341bcbe0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880341bda40 pfn:0x341bc
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880341bc171
flags: 0x80000000000240(workingset|head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000240 ffff888140412780 ffffea0001036010 ffffea000100bc10
raw: ffff8880341bda40 000001c00012000f 00000000f5000000 ffff8880341bc171
head: 0080000000000240 ffff888140412780 ffffea0001036010 ffffea000100bc10
head: ffff8880341bda40 000001c00012000f 00000000f5000000 ffff8880341bc171
head: 0080000000000001 ffffea0000d06f01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 18378, tgid 18375 (syz.6.3692), ts 1535437491766, free_ts 1534179924298
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884
prep_new_page mm/page_alloc.c:1892 [inline]
get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3950
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5245
alloc_slab_page mm/slub.c:3238 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3411
new_slab mm/slub.c:3469 [inline]
refill_objects+0x334/0x3c0 mm/slub.c:7091
refill_sheaf mm/slub.c:2787 [inline]
__pcs_replace_empty_main+0x328/0x5f0 mm/slub.c:4536
alloc_from_pcs mm/slub.c:4639 [inline]
slab_alloc_node mm/slub.c:4773 [inline]
kmem_cache_alloc_noprof+0x433/0x680 mm/slub.c:4795
alloc_vfsmnt+0x23/0x420 fs/namespace.c:287
clone_mnt+0x4b/0x9a0 fs/namespace.c:1246
copy_tree+0x3d4/0x930 fs/namespace.c:2194
get_detached_copy fs/namespace.c:3044 [inline]
open_detached_copy+0x23e/0x5a0 fs/namespace.c:3060
vfs_open_tree+0x490/0x1040 fs/namespace.c:3220
__do_sys_open_tree fs/namespace.c:3227 [inline]
__se_sys_open_tree fs/namespace.c:3225 [inline]
__x64_sys_open_tree+0x96/0x110 fs/namespace.c:3225
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
page last free pid 5166 tgid 5166 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xfd0/0x1160 mm/page_alloc.c:2973
__slab_free+0x24f/0x2a0 mm/slub.c:5490
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:4459 [inline]
slab_alloc_node mm/slub.c:4788 [inline]
kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4795
alloc_filename fs/namei.c:142 [inline]
do_getname+0x2e/0x250 fs/namei.c:182
getname include/linux/fs.h:2512 [inline]
class_filename_constructor include/linux/fs.h:2539 [inline]
do_sys_openat2+0xca/0x200 fs/open.c:1365
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
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:
ffff8880341bca00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880341bca80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880341bcb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880341bcb80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff8880341bcc00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
---
This report is generated by a bot. It may contain errors.
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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:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: c22e26bd0906 Merge tag 'landlock-7.0-rc1' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12c6a6e6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6428d17febdfb14e
dashboard link: https://syzkaller.appspot.com/bug?extid=a89f9434fb5a001ccd58
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b33c549157ca/disk-c22e26bd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/34c7ded19553/vmlinux-c22e26bd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/66faec2158ed/bzImage-c22e26bd.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a89f94...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x4e/0x130 lib/list_debug.c:29
Read of size 8 at addr ffff8880341bcb40 by task syz.6.5169/22925
CPU: 1 UID: 0 PID: 22925 Comm: syz.6.5169 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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
__list_add_valid_or_report+0x4e/0x130 lib/list_debug.c:29
__list_add_valid include/linux/list.h:96 [inline]
__list_add include/linux/list.h:158 [inline]
list_add include/linux/list.h:177 [inline]
clone_mnt+0x447/0x9a0 fs/namespace.c:1275
copy_tree+0xde/0x930 fs/namespace.c:2159
copy_mnt_ns+0x24d/0x990 fs/namespace.c:4246
create_new_namespaces+0xcf/0x6a0 kernel/nsproxy.c:98
unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:226
ksys_unshare+0x4f4/0x900 kernel/fork.c:3174
__do_sys_unshare kernel/fork.c:3245 [inline]
__se_sys_unshare kernel/fork.c:3243 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3243
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: 0033:0x7ff48d79bf79
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:00007ff48b9f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ff48da15fa0 RCX: 00007ff48d79bf79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002a020400
RBP: 00007ff48d8327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff48da16038 R14: 00007ff48da15fa0 R15: 00007ffc92e1ac28
</TASK>
Allocated by task 22855:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4459 [inline]
slab_alloc_node mm/slub.c:4788 [inline]
kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4795
alloc_vfsmnt+0x23/0x420 fs/namespace.c:287
clone_mnt+0x4b/0x9a0 fs/namespace.c:1246
create_new_namespace fs/namespace.c:3098 [inline]
open_new_namespace fs/namespace.c:3168 [inline]
vfs_open_tree+0x507/0x1040 fs/namespace.c:3217
__do_sys_open_tree fs/namespace.c:3227 [inline]
__se_sys_open_tree fs/namespace.c:3225 [inline]
__x64_sys_open_tree+0x96/0x110 fs/namespace.c:3225
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 20:
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:2670 [inline]
slab_free mm/slub.c:6082 [inline]
kmem_cache_free+0x185/0x690 mm/slub.c:6212
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core kernel/rcu/tree.c:2869 [inline]
rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2957
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3131 [inline]
call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
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
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
task_work_add+0xb6/0x440 kernel/task_work.c:70
mntput_no_expire_slowpath+0x70c/0xbd0 fs/namespace.c:1379
create_new_namespace fs/namespace.c:3162 [inline]
open_new_namespace fs/namespace.c:3168 [inline]
vfs_open_tree+0xe17/0x1040 fs/namespace.c:3217
__do_sys_open_tree fs/namespace.c:3227 [inline]
__se_sys_open_tree fs/namespace.c:3225 [inline]
__x64_sys_open_tree+0x96/0x110 fs/namespace.c:3225
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
The buggy address belongs to the object at ffff8880341bca80
which belongs to the cache mnt_cache of size 352
The buggy address is located 192 bytes inside of
freed 352-byte region [ffff8880341bca80, ffff8880341bcbe0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880341bda40 pfn:0x341bc
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880341bc171
flags: 0x80000000000240(workingset|head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000240 ffff888140412780 ffffea0001036010 ffffea000100bc10
raw: ffff8880341bda40 000001c00012000f 00000000f5000000 ffff8880341bc171
head: 0080000000000240 ffff888140412780 ffffea0001036010 ffffea000100bc10
head: ffff8880341bda40 000001c00012000f 00000000f5000000 ffff8880341bc171
head: 0080000000000001 ffffea0000d06f01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 18378, tgid 18375 (syz.6.3692), ts 1535437491766, free_ts 1534179924298
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884
prep_new_page mm/page_alloc.c:1892 [inline]
get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3950
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5245
alloc_slab_page mm/slub.c:3238 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3411
new_slab mm/slub.c:3469 [inline]
refill_objects+0x334/0x3c0 mm/slub.c:7091
refill_sheaf mm/slub.c:2787 [inline]
__pcs_replace_empty_main+0x328/0x5f0 mm/slub.c:4536
alloc_from_pcs mm/slub.c:4639 [inline]
slab_alloc_node mm/slub.c:4773 [inline]
kmem_cache_alloc_noprof+0x433/0x680 mm/slub.c:4795
alloc_vfsmnt+0x23/0x420 fs/namespace.c:287
clone_mnt+0x4b/0x9a0 fs/namespace.c:1246
copy_tree+0x3d4/0x930 fs/namespace.c:2194
get_detached_copy fs/namespace.c:3044 [inline]
open_detached_copy+0x23e/0x5a0 fs/namespace.c:3060
vfs_open_tree+0x490/0x1040 fs/namespace.c:3220
__do_sys_open_tree fs/namespace.c:3227 [inline]
__se_sys_open_tree fs/namespace.c:3225 [inline]
__x64_sys_open_tree+0x96/0x110 fs/namespace.c:3225
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
page last free pid 5166 tgid 5166 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xfd0/0x1160 mm/page_alloc.c:2973
__slab_free+0x24f/0x2a0 mm/slub.c:5490
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:4459 [inline]
slab_alloc_node mm/slub.c:4788 [inline]
kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4795
alloc_filename fs/namei.c:142 [inline]
do_getname+0x2e/0x250 fs/namei.c:182
getname include/linux/fs.h:2512 [inline]
class_filename_constructor include/linux/fs.h:2539 [inline]
do_sys_openat2+0xca/0x200 fs/open.c:1365
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
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:
ffff8880341bca00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880341bca80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880341bcb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880341bcb80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff8880341bcc00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
---
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