[v6.6] KASAN: slab-use-after-free Read in ext4_read_inline_data
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syzbot
Jun 21, 2026, 1:23:29 AM (yesterday) Jun 21
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: d1cfde2d5d15 Linux 6.6.143
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=147b43ee580000
kernel config: https://syzkaller.appspot.com/x/.config?x=441765643cbfb8d
dashboard link: https://syzkaller.appspot.com/bug?extid=ac7795594cbc0754046a
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4e37bcd98892/disk-d1cfde2d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/64b2ed856057/vmlinux-d1cfde2d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0a6949479d66/bzImage-d1cfde2d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ac7795...@syzkaller.appspotmail.com
Zero length message leads to an empty skb
==================================================================
BUG: KASAN: slab-use-after-free in ext4_read_inline_data+0x1c0/0x2a0 fs/ext4/inline.c:209
Read of size 68 at addr ffff88805eb7ac80 by task syz.0.174/6620
CPU: 0 PID: 6620 Comm: syz.0.174 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x241/0x290 mm/kasan/generic.c:187
__asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
ext4_read_inline_data+0x1c0/0x2a0 fs/ext4/inline.c:209
ext4_convert_inline_data_nolock+0x138/0x730 fs/ext4/inline.c:1214
ext4_try_add_inline_entry+0x73c/0xa70 fs/ext4/inline.c:1340
ext4_add_entry+0x5cc/0xd90 fs/ext4/namei.c:2458
ext4_mkdir+0x524/0xc90 fs/ext4/namei.c:3081
vfs_mkdir+0x2a5/0x470 fs/namei.c:4121
do_mkdirat+0x1dc/0x450 fs/namei.c:4144
__do_sys_mkdirat fs/namei.c:4159 [inline]
__se_sys_mkdirat fs/namei.c:4157 [inline]
__x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4157
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa33b19bcc7
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007fa3393f5e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fa3393f5ee0 RCX: 00007fa33b19bcc7
RDX: 00000000000001ff RSI: 0000200000000080 RDI: 00000000ffffff9c
RBP: 0000200000000140 R08: 0000200000000080 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000246 R12: 0000200000000080
R13: 00007fa3393f5ea0 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 4519:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
skb_clone+0x1eb/0x370 net/core/skbuff.c:1912
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:381 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:414 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x5b6/0x7d0 net/batman-adv/bat_iv_ogm.c:1783
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Freed by task 4519:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x290 mm/slub.c:3852
__netif_receive_skb_core+0x348e/0x3ab0 net/core/dev.c:5620
__netif_receive_skb_one_core net/core/dev.c:5644 [inline]
__netif_receive_skb+0x74/0x290 net/core/dev.c:5760
process_backlog+0x380/0x710 net/core/dev.c:6088
__napi_poll+0xbb/0x460 net/core/dev.c:6650
napi_poll net/core/dev.c:6717 [inline]
net_rx_action+0x65f/0xcc0 net/core/dev.c:6853
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
do_softirq+0xfa/0x1a0 kernel/softirq.c:479
__local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:406
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:856 [inline]
__dev_queue_xmit+0x1bc2/0x3630 net/core/dev.c:4490
dev_queue_xmit include/linux/netdevice.h:3113 [inline]
batadv_send_skb_packet+0x3dd/0x660 net/batman-adv/send.c:108
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:386 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:414 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x62d/0x7d0 net/batman-adv/bat_iv_ogm.c:1783
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88805eb7ac80
which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 0 bytes inside of
freed 240-byte region [ffff88805eb7ac80, ffff88805eb7ad70)
The buggy address belongs to the physical page:
page:ffffea00017ade80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5eb7a
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff88801ea5f280 dead000000000122 0000000000000000
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 4519, tgid 4519 (kworker/u4:10), ts 226566225687, free_ts 226468523707
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x109/0x2c0 mm/slub.c:3519
__build_skb net/core/skbuff.c:451 [inline]
__netdev_alloc_skb+0x213/0x500 net/core/skbuff.c:743
__netdev_alloc_skb_ip_align include/linux/skbuff.h:3324 [inline]
netdev_alloc_skb_ip_align include/linux/skbuff.h:3334 [inline]
batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:557 [inline]
batadv_iv_ogm_queue_add+0x833/0xdb0 net/batman-adv/bat_iv_ogm.c:673
batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:866 [inline]
batadv_iv_ogm_schedule+0xba1/0x1080 net/batman-adv/bat_iv_ogm.c:898
batadv_iv_send_outstanding_bat_ogm_packet+0x6bf/0x7d0 net/batman-adv/bat_iv_ogm.c:1795
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
tlb_batch_list_free mm/mmu_gather.c:115 [inline]
tlb_finish_mmu+0x13e/0x220 mm/mmu_gather.c:428
exit_mmap+0x428/0xb90 mm/mmap.c:3315
__mmput+0x118/0x3a0 kernel/fork.c:1357
exit_mm+0x23f/0x340 kernel/exit.c:570
do_exit+0x909/0x2530 kernel/exit.c:871
do_group_exit+0x22d/0x2f0 kernel/exit.c:1026
get_signal+0x12a6/0x1390 kernel/signal.c:2903
arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
Memory state around the buggy address:
ffff88805eb7ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805eb7ac00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>ffff88805eb7ac80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805eb7ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
ffff88805eb7ad80: 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: d1cfde2d5d15 Linux 6.6.143
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=147b43ee580000
kernel config: https://syzkaller.appspot.com/x/.config?x=441765643cbfb8d
dashboard link: https://syzkaller.appspot.com/bug?extid=ac7795594cbc0754046a
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4e37bcd98892/disk-d1cfde2d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/64b2ed856057/vmlinux-d1cfde2d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0a6949479d66/bzImage-d1cfde2d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ac7795...@syzkaller.appspotmail.com
Zero length message leads to an empty skb
==================================================================
BUG: KASAN: slab-use-after-free in ext4_read_inline_data+0x1c0/0x2a0 fs/ext4/inline.c:209
Read of size 68 at addr ffff88805eb7ac80 by task syz.0.174/6620
CPU: 0 PID: 6620 Comm: syz.0.174 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x241/0x290 mm/kasan/generic.c:187
__asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
ext4_read_inline_data+0x1c0/0x2a0 fs/ext4/inline.c:209
ext4_convert_inline_data_nolock+0x138/0x730 fs/ext4/inline.c:1214
ext4_try_add_inline_entry+0x73c/0xa70 fs/ext4/inline.c:1340
ext4_add_entry+0x5cc/0xd90 fs/ext4/namei.c:2458
ext4_mkdir+0x524/0xc90 fs/ext4/namei.c:3081
vfs_mkdir+0x2a5/0x470 fs/namei.c:4121
do_mkdirat+0x1dc/0x450 fs/namei.c:4144
__do_sys_mkdirat fs/namei.c:4159 [inline]
__se_sys_mkdirat fs/namei.c:4157 [inline]
__x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4157
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa33b19bcc7
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007fa3393f5e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fa3393f5ee0 RCX: 00007fa33b19bcc7
RDX: 00000000000001ff RSI: 0000200000000080 RDI: 00000000ffffff9c
RBP: 0000200000000140 R08: 0000200000000080 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000246 R12: 0000200000000080
R13: 00007fa3393f5ea0 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 4519:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
skb_clone+0x1eb/0x370 net/core/skbuff.c:1912
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:381 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:414 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x5b6/0x7d0 net/batman-adv/bat_iv_ogm.c:1783
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Freed by task 4519:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x290 mm/slub.c:3852
__netif_receive_skb_core+0x348e/0x3ab0 net/core/dev.c:5620
__netif_receive_skb_one_core net/core/dev.c:5644 [inline]
__netif_receive_skb+0x74/0x290 net/core/dev.c:5760
process_backlog+0x380/0x710 net/core/dev.c:6088
__napi_poll+0xbb/0x460 net/core/dev.c:6650
napi_poll net/core/dev.c:6717 [inline]
net_rx_action+0x65f/0xcc0 net/core/dev.c:6853
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
do_softirq+0xfa/0x1a0 kernel/softirq.c:479
__local_bh_enable_ip+0x184/0x1c0 kernel/softirq.c:406
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:856 [inline]
__dev_queue_xmit+0x1bc2/0x3630 net/core/dev.c:4490
dev_queue_xmit include/linux/netdevice.h:3113 [inline]
batadv_send_skb_packet+0x3dd/0x660 net/batman-adv/send.c:108
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:386 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:414 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x62d/0x7d0 net/batman-adv/bat_iv_ogm.c:1783
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88805eb7ac80
which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 0 bytes inside of
freed 240-byte region [ffff88805eb7ac80, ffff88805eb7ad70)
The buggy address belongs to the physical page:
page:ffffea00017ade80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5eb7a
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff88801ea5f280 dead000000000122 0000000000000000
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 4519, tgid 4519 (kworker/u4:10), ts 226566225687, free_ts 226468523707
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x109/0x2c0 mm/slub.c:3519
__build_skb net/core/skbuff.c:451 [inline]
__netdev_alloc_skb+0x213/0x500 net/core/skbuff.c:743
__netdev_alloc_skb_ip_align include/linux/skbuff.h:3324 [inline]
netdev_alloc_skb_ip_align include/linux/skbuff.h:3334 [inline]
batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:557 [inline]
batadv_iv_ogm_queue_add+0x833/0xdb0 net/batman-adv/bat_iv_ogm.c:673
batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:866 [inline]
batadv_iv_ogm_schedule+0xba1/0x1080 net/batman-adv/bat_iv_ogm.c:898
batadv_iv_send_outstanding_bat_ogm_packet+0x6bf/0x7d0 net/batman-adv/bat_iv_ogm.c:1795
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
tlb_batch_list_free mm/mmu_gather.c:115 [inline]
tlb_finish_mmu+0x13e/0x220 mm/mmu_gather.c:428
exit_mmap+0x428/0xb90 mm/mmap.c:3315
__mmput+0x118/0x3a0 kernel/fork.c:1357
exit_mm+0x23f/0x340 kernel/exit.c:570
do_exit+0x909/0x2530 kernel/exit.c:871
do_group_exit+0x22d/0x2f0 kernel/exit.c:1026
get_signal+0x12a6/0x1390 kernel/signal.c:2903
arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
Memory state around the buggy address:
ffff88805eb7ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805eb7ac00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>ffff88805eb7ac80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805eb7ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
ffff88805eb7ad80: 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
Jun 21, 2026, 2:16:25 AM (yesterday) Jun 21
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: d1cfde2d5d15 Linux 6.6.143
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=121b06ae580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11226bee580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4e37bcd98892/disk-d1cfde2d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/64b2ed856057/vmlinux-d1cfde2d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0a6949479d66/bzImage-d1cfde2d.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/ff1cfb20bf24/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=16226bee580000)
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/1afa511cb84e/mount_8.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=10bad7b6580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ac7795...@syzkaller.appspotmail.com
EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support!
EXT4-fs (loop0): encrypted files will use data=ordered instead of data journaling mode
EXT4-fs (loop0): 1 truncate cleaned up
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_read_inline_data+0x1c0/0x2a0 fs/ext4/inline.c:209
Read of size 68 at addr ffff88801fbf1c80 by task syz.0.17/5937
CPU: 0 PID: 5937 Comm: syz.0.17 Not tainted syzkaller #0
RAX: ffffffffffffffda RBX: 00007fffc00ce170 RCX: 00007fbf7839bcc7
</TASK>
Allocated by task 5877:
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
tipc_link_create+0x124/0xdf0 net/tipc/link.c:512
tipc_link_bc_create+0xee/0x4a0 net/tipc/link.c:586
tipc_bcast_init+0x198/0x330 net/tipc/bcast.c:701
tipc_init_net+0x270/0x330 net/tipc/core.c:84
ops_init+0x391/0x640 net/core/net_namespace.c:139
setup_net+0x3b6/0xa20 net/core/net_namespace.c:343
copy_net_ns+0x35e/0x5d0 net/core/net_namespace.c:520
create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:228
ksys_unshare+0x4fa/0x8f0 kernel/fork.c:3442
__do_sys_unshare kernel/fork.c:3516 [inline]
__se_sys_unshare kernel/fork.c:3514 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3514
tipc_exit_net+0x51/0x130 net/tipc/core.c:115
ops_exit_list net/core/net_namespace.c:173 [inline]
cleanup_net+0x707/0xbb0 net/core/net_namespace.c:652
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 128 bytes to the right of
allocated 1024-byte region [ffff88801fbf1800, ffff88801fbf1c00)
The buggy address belongs to the physical page:
page:ffffea00007efc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fbf0
head:ffffea00007efc00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017c41dc0 0000000000000000 0000000000000001
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa7/0x240 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
load_elf_phdrs+0x136/0x240 fs/binfmt_elf.c:512
load_elf_binary+0x9aa/0x2850 fs/binfmt_elf.c:986
search_binary_handler fs/exec.c:1775 [inline]
exec_binprm fs/exec.c:1817 [inline]
bprm_execve+0xb0b/0x1730 fs/exec.c:1892
do_execveat_common+0x501/0x6b0 fs/exec.c:1998
do_execve fs/exec.c:2072 [inline]
__do_sys_execve fs/exec.c:2148 [inline]
__se_sys_execve fs/exec.c:2143 [inline]
__x64_sys_execve+0x92/0xa0 fs/exec.c:2143
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
put_cpu_partial+0x17c/0x250 mm/slub.c:2743
__slab_free+0x319/0x400 mm/slub.c:3700
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
do_sys_openat2+0xda/0x1d0 fs/open.c:1415
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1447
ffff88801fbf1c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801fbf1c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88801fbf1d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801fbf1d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: d1cfde2d5d15 Linux 6.6.143
git tree: linux-6.6.y
kernel config: https://syzkaller.appspot.com/x/.config?x=441765643cbfb8d
dashboard link: https://syzkaller.appspot.com/bug?extid=ac7795594cbc0754046a
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11817986580000
dashboard link: https://syzkaller.appspot.com/bug?extid=ac7795594cbc0754046a
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11226bee580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4e37bcd98892/disk-d1cfde2d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/64b2ed856057/vmlinux-d1cfde2d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0a6949479d66/bzImage-d1cfde2d.xz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=16226bee580000)
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/1afa511cb84e/mount_8.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=10bad7b6580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ac7795...@syzkaller.appspotmail.com
EXT4-fs (loop0): encrypted files will use data=ordered instead of data journaling mode
EXT4-fs (loop0): 1 truncate cleaned up
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_read_inline_data+0x1c0/0x2a0 fs/ext4/inline.c:209
Read of size 68 at addr ffff88801fbf1c80 by task syz.0.17/5937
CPU: 0 PID: 5937 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x241/0x290 mm/kasan/generic.c:187
__asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
ext4_read_inline_data+0x1c0/0x2a0 fs/ext4/inline.c:209
ext4_convert_inline_data_nolock+0x138/0x730 fs/ext4/inline.c:1214
ext4_try_add_inline_entry+0x73c/0xa70 fs/ext4/inline.c:1340
ext4_add_entry+0x5cc/0xd90 fs/ext4/namei.c:2458
ext4_mkdir+0x524/0xc90 fs/ext4/namei.c:3081
vfs_mkdir+0x2a5/0x470 fs/namei.c:4121
do_mkdirat+0x1dc/0x450 fs/namei.c:4144
__do_sys_mkdirat fs/namei.c:4159 [inline]
__se_sys_mkdirat fs/namei.c:4157 [inline]
__x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4157
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fbf7839bcc7
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x241/0x290 mm/kasan/generic.c:187
__asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
ext4_read_inline_data+0x1c0/0x2a0 fs/ext4/inline.c:209
ext4_convert_inline_data_nolock+0x138/0x730 fs/ext4/inline.c:1214
ext4_try_add_inline_entry+0x73c/0xa70 fs/ext4/inline.c:1340
ext4_add_entry+0x5cc/0xd90 fs/ext4/namei.c:2458
ext4_mkdir+0x524/0xc90 fs/ext4/namei.c:3081
vfs_mkdir+0x2a5/0x470 fs/namei.c:4121
do_mkdirat+0x1dc/0x450 fs/namei.c:4144
__do_sys_mkdirat fs/namei.c:4159 [inline]
__se_sys_mkdirat fs/namei.c:4157 [inline]
__x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4157
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007fffc00ce0e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fffc00ce170 RCX: 00007fbf7839bcc7
RDX: 00000000000001ff RSI: 0000200000000080 RDI: 00000000ffffff9c
RBP: 0000200000000140 R08: 0000200000000080 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000246 R12: 0000200000000080
R13: 00007fffc00ce130 R14: 0000000000000000 R15: 0000000000000000
RBP: 0000200000000140 R08: 0000200000000080 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000246 R12: 0000200000000080
</TASK>
Allocated by task 5877:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
tipc_link_create+0x124/0xdf0 net/tipc/link.c:512
tipc_link_bc_create+0xee/0x4a0 net/tipc/link.c:586
tipc_bcast_init+0x198/0x330 net/tipc/bcast.c:701
tipc_init_net+0x270/0x330 net/tipc/core.c:84
ops_init+0x391/0x640 net/core/net_namespace.c:139
setup_net+0x3b6/0xa20 net/core/net_namespace.c:343
copy_net_ns+0x35e/0x5d0 net/core/net_namespace.c:520
create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:228
ksys_unshare+0x4fa/0x8f0 kernel/fork.c:3442
__do_sys_unshare kernel/fork.c:3516 [inline]
__se_sys_unshare kernel/fork.c:3514 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3514
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 49:
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
__kmem_cache_free+0xba/0x1f0 mm/slub.c:3843
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
tipc_exit_net+0x51/0x130 net/tipc/core.c:115
ops_exit_list net/core/net_namespace.c:173 [inline]
cleanup_net+0x707/0xbb0 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88801fbf1800
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 128 bytes to the right of
allocated 1024-byte region [ffff88801fbf1800, ffff88801fbf1c00)
The buggy address belongs to the physical page:
head:ffffea00007efc00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017c41dc0 0000000000000000 0000000000000001
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
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 5515, tgid 5515 (S50sshd), ts 47661433465, free_ts 47628305882
page_owner tracks the page as allocated
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0xa7/0x240 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
load_elf_phdrs+0x136/0x240 fs/binfmt_elf.c:512
load_elf_binary+0x9aa/0x2850 fs/binfmt_elf.c:986
search_binary_handler fs/exec.c:1775 [inline]
exec_binprm fs/exec.c:1817 [inline]
bprm_execve+0xb0b/0x1730 fs/exec.c:1892
do_execveat_common+0x501/0x6b0 fs/exec.c:1998
do_execve fs/exec.c:2072 [inline]
__do_sys_execve fs/exec.c:2148 [inline]
__se_sys_execve fs/exec.c:2143 [inline]
__x64_sys_execve+0x92/0xa0 fs/exec.c:2143
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
discard_slab mm/slub.c:2127 [inline]
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
put_cpu_partial+0x17c/0x250 mm/slub.c:2743
__slab_free+0x319/0x400 mm/slub.c:3700
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
getname_flags+0xbb/0x500 fs/namei.c:140
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
do_sys_openat2+0xda/0x1d0 fs/open.c:1415
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1447
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff88801fbf1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801fbf1c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801fbf1c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88801fbf1d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801fbf1d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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