[moderation] [fs?] KASAN: slab-use-after-free Read in change_mnt_propagation
1 view
Skip to first unread message
syzbot
1:38 AM (6 hours ago) 1:38 AM
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 8bf22c33e7a1 Merge tag 'net-7.0-rc1' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15c37ffa580000
kernel config: https://syzkaller.appspot.com/x/.config?x=665cbf0979cda6c5
dashboard link: https://syzkaller.appspot.com/bug?extid=244d89581a31bb90ee50
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [bra...@kernel.org ja...@suse.cz linux-...@vger.kernel.org linux-...@vger.kernel.org vi...@zeniv.linux.org.uk]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/720745129545/disk-8bf22c33.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5610cbcaea43/vmlinux-8bf22c33.xz
kernel image: https://storage.googleapis.com/syzbot-assets/390f106a526e/bzImage-8bf22c33.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+244d89...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62
Read of size 8 at addr ffff888062884b38 by task syz.6.4289/20574
CPU: 0 UID: 0 PID: 20574 Comm: syz.6.4289 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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
__list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62
__list_del_entry_valid include/linux/list.h:132 [inline]
__list_del_entry include/linux/list.h:223 [inline]
list_del_init include/linux/list.h:295 [inline]
change_mnt_propagation+0x11c/0x7a0 fs/pnode.c:106
mount_setattr_commit fs/namespace.c:4867 [inline]
do_mount_setattr+0xdac/0x1560 fs/namespace.c:4919
__do_sys_mount_setattr fs/namespace.c:5125 [inline]
__se_sys_mount_setattr+0x1d7/0x280 fs/namespace.c:5091
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: 0033:0x7f00a9d9c629
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:00007f00aacd6028 EFLAGS: 00000246 ORIG_RAX: 00000000000001ba
RAX: ffffffffffffffda RBX: 00007f00aa015fa0 RCX: 00007f00a9d9c629
RDX: 0000000000000000 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f00a9e32b39 R08: 0000000000000020 R09: 0000000000000000
R10: 0000200000001dc0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00aa016038 R14: 00007f00aa015fa0 R15: 00007ffcbac744f8
</TASK>
Allocated by task 20228:
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:4501 [inline]
slab_alloc_node mm/slub.c:4830 [inline]
kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4837
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 23:
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:2687 [inline]
slab_free mm/slub.c:6124 [inline]
kmem_cache_free+0x187/0x630 mm/slub.c:6254
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063
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 ffff888062884a80
which belongs to the cache mnt_cache of size 352
The buggy address is located 184 bytes inside of
freed 352-byte region [ffff888062884a80, ffff888062884be0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880628841c0 pfn:0x62884
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888062884171
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801babd8c0 ffffea0001e94410 ffffea0000d6f510
raw: ffff8880628841c0 000001c00012000e 00000000f5000000 ffff888062884171
head: 00fff00000000240 ffff88801babd8c0 ffffea0001e94410 ffffea0000d6f510
head: ffff8880628841c0 000001c00012000e 00000000f5000000 ffff888062884171
head: 00fff00000000001 ffffea00018a2101 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 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 19052, tgid 19049 (syz.5.3934), ts 707415879604, free_ts 695807241879
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+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3255 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3444
new_slab mm/slub.c:3502 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7134
refill_sheaf mm/slub.c:2804 [inline]
__pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4578
alloc_from_pcs mm/slub.c:4681 [inline]
slab_alloc_node mm/slub.c:4815 [inline]
kmem_cache_alloc_noprof+0x37d/0x650 mm/slub.c:4837
alloc_vfsmnt+0x23/0x420 fs/namespace.c:287
clone_mnt+0x4b/0x9a0 fs/namespace.c:1246
copy_tree+0x3d4/0x930 fs/namespace.c:2194
copy_mnt_ns+0x24d/0x990 fs/namespace.c:4246
create_new_namespaces+0xcf/0x6a0 kernel/nsproxy.c:98
copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:195
copy_process+0x18e2/0x3cf0 kernel/fork.c:2226
kernel_clone+0x248/0x8e0 kernel/fork.c:2654
__do_sys_clone kernel/fork.c:2795 [inline]
__se_sys_clone kernel/fork.c:2779 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2779
page last free pid 18910 tgid 18910 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
__folio_put+0x414/0x4f0 mm/swap.c:112
pipe_buf_release include/linux/pipe_fs_i.h:273 [inline]
free_pipe_info+0x1f5/0x3a0 fs/pipe.c:855
put_pipe_info fs/pipe.c:721 [inline]
pipe_release+0x242/0x330 fs/pipe.c:744
__fput+0x44f/0xa70 fs/file_table.c:469
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
Memory state around the buggy address:
ffff888062884a00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
ffff888062884a80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888062884b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888062884b80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888062884c00: fc fc fc fc fc fc fc fc fa 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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
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: 8bf22c33e7a1 Merge tag 'net-7.0-rc1' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15c37ffa580000
kernel config: https://syzkaller.appspot.com/x/.config?x=665cbf0979cda6c5
dashboard link: https://syzkaller.appspot.com/bug?extid=244d89581a31bb90ee50
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [bra...@kernel.org ja...@suse.cz linux-...@vger.kernel.org linux-...@vger.kernel.org vi...@zeniv.linux.org.uk]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/720745129545/disk-8bf22c33.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5610cbcaea43/vmlinux-8bf22c33.xz
kernel image: https://storage.googleapis.com/syzbot-assets/390f106a526e/bzImage-8bf22c33.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+244d89...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62
Read of size 8 at addr ffff888062884b38 by task syz.6.4289/20574
CPU: 0 UID: 0 PID: 20574 Comm: syz.6.4289 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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
__list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62
__list_del_entry_valid include/linux/list.h:132 [inline]
__list_del_entry include/linux/list.h:223 [inline]
list_del_init include/linux/list.h:295 [inline]
change_mnt_propagation+0x11c/0x7a0 fs/pnode.c:106
mount_setattr_commit fs/namespace.c:4867 [inline]
do_mount_setattr+0xdac/0x1560 fs/namespace.c:4919
__do_sys_mount_setattr fs/namespace.c:5125 [inline]
__se_sys_mount_setattr+0x1d7/0x280 fs/namespace.c:5091
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: 0033:0x7f00a9d9c629
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:00007f00aacd6028 EFLAGS: 00000246 ORIG_RAX: 00000000000001ba
RAX: ffffffffffffffda RBX: 00007f00aa015fa0 RCX: 00007f00a9d9c629
RDX: 0000000000000000 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f00a9e32b39 R08: 0000000000000020 R09: 0000000000000000
R10: 0000200000001dc0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00aa016038 R14: 00007f00aa015fa0 R15: 00007ffcbac744f8
</TASK>
Allocated by task 20228:
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:4501 [inline]
slab_alloc_node mm/slub.c:4830 [inline]
kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4837
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 23:
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:2687 [inline]
slab_free mm/slub.c:6124 [inline]
kmem_cache_free+0x187/0x630 mm/slub.c:6254
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063
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 ffff888062884a80
which belongs to the cache mnt_cache of size 352
The buggy address is located 184 bytes inside of
freed 352-byte region [ffff888062884a80, ffff888062884be0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880628841c0 pfn:0x62884
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888062884171
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801babd8c0 ffffea0001e94410 ffffea0000d6f510
raw: ffff8880628841c0 000001c00012000e 00000000f5000000 ffff888062884171
head: 00fff00000000240 ffff88801babd8c0 ffffea0001e94410 ffffea0000d6f510
head: ffff8880628841c0 000001c00012000e 00000000f5000000 ffff888062884171
head: 00fff00000000001 ffffea00018a2101 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 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 19052, tgid 19049 (syz.5.3934), ts 707415879604, free_ts 695807241879
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+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3255 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3444
new_slab mm/slub.c:3502 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7134
refill_sheaf mm/slub.c:2804 [inline]
__pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4578
alloc_from_pcs mm/slub.c:4681 [inline]
slab_alloc_node mm/slub.c:4815 [inline]
kmem_cache_alloc_noprof+0x37d/0x650 mm/slub.c:4837
alloc_vfsmnt+0x23/0x420 fs/namespace.c:287
clone_mnt+0x4b/0x9a0 fs/namespace.c:1246
copy_tree+0x3d4/0x930 fs/namespace.c:2194
copy_mnt_ns+0x24d/0x990 fs/namespace.c:4246
create_new_namespaces+0xcf/0x6a0 kernel/nsproxy.c:98
copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:195
copy_process+0x18e2/0x3cf0 kernel/fork.c:2226
kernel_clone+0x248/0x8e0 kernel/fork.c:2654
__do_sys_clone kernel/fork.c:2795 [inline]
__se_sys_clone kernel/fork.c:2779 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2779
page last free pid 18910 tgid 18910 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
__folio_put+0x414/0x4f0 mm/swap.c:112
pipe_buf_release include/linux/pipe_fs_i.h:273 [inline]
free_pipe_info+0x1f5/0x3a0 fs/pipe.c:855
put_pipe_info fs/pipe.c:721 [inline]
pipe_release+0x242/0x330 fs/pipe.c:744
__fput+0x44f/0xa70 fs/file_table.c:469
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
Memory state around the buggy address:
ffff888062884a00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
ffff888062884a80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888062884b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888062884b80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888062884c00: fc fc fc fc fc fc fc fc fa 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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
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
Reply all
Reply to author
Forward
0 new messages