[Android 5.15] KASAN: use-after-free Read in f2fs_iget
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syzbot
Jan 5, 2026, 8:52:25 PM (2 days ago) Jan 5
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 050dc55b0457 Revert "net/sched: act_connmark: handle errno..
git tree: android13-5.15-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=10072f92580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7c25e09ce0f4abfd
dashboard link: https://syzkaller.appspot.com/bug?extid=4caab9eb365b68860e2e
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12faae9a580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11902074580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/45501ad7c8cb/disk-050dc55b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/008893f41078/vmlinux-050dc55b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c805ce08e8e/bzImage-050dc55b.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7c352555a185/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=16902074580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4caab9...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in sanity_check_inode fs/f2fs/inode.c:287 [inline]
BUG: KASAN: use-after-free in do_read_inode fs/f2fs/inode.c:427 [inline]
BUG: KASAN: use-after-free in f2fs_iget+0x487c/0x5230 fs/f2fs/inode.c:539
Read of size 4 at addr ffff888120a86098 by task syz.5.17/435
CPU: 1 PID: 435 Comm: syz.5.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:427 [inline]
kasan_report+0xf1/0x140 mm/kasan/report.c:444
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
sanity_check_inode fs/f2fs/inode.c:287 [inline]
do_read_inode fs/f2fs/inode.c:427 [inline]
f2fs_iget+0x487c/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
lookup_open fs/namei.c:3448 [inline]
open_last_lookups fs/namei.c:3540 [inline]
path_openat+0xfcf/0x2f10 fs/namei.c:3747
do_filp_open+0x1b3/0x3e0 fs/namei.c:3777
do_sys_openat2+0x14c/0x7b0 fs/open.c:1236
do_sys_open fs/open.c:1252 [inline]
__do_sys_openat fs/open.c:1268 [inline]
__se_sys_openat fs/open.c:1263 [inline]
__x64_sys_openat+0x136/0x160 fs/open.c:1263
x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f76f640c749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f76f625b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f76f6663090 RCX: 00007f76f640c749
RDX: 0000000000101000 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f76f6490f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f76f6663128 R14: 00007f76f6663090 R15: 00007fff917ae288
</TASK>
Allocated by task 422:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
__kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:217 [inline]
slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
slab_alloc_node mm/slub.c:3245 [inline]
slab_alloc mm/slub.c:3255 [inline]
kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
__grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
__f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
f2fs_init_extent_tree+0x4b9/0xc70 fs/f2fs/extent_cache.c:404
do_read_inode fs/f2fs/inode.c:404 [inline]
f2fs_iget+0x13c9/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
user_path_at_empty+0x47/0x1c0 fs/namei.c:2891
user_path_at include/linux/namei.h:57 [inline]
do_sys_truncate+0xa3/0x190 fs/open.c:133
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:145
x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 422:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
slab_free mm/slub.c:3526 [inline]
kmem_cache_free+0x100/0x320 mm/slub.c:3544
f2fs_destroy_extent_tree+0x2c0/0x4b0 fs/f2fs/extent_cache.c:845
f2fs_evict_inode+0x4f0/0x1600 fs/f2fs/inode.c:812
evict+0x485/0x870 fs/inode.c:650
iput_final fs/inode.c:1779 [inline]
iput+0x635/0x7c0 fs/inode.c:1805
iget_failed+0x17a/0x1c0 fs/bad_inode.c:250
f2fs_iget+0x1aeb/0x5230 fs/f2fs/inode.c:600
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
user_path_at_empty+0x47/0x1c0 fs/namei.c:2891
user_path_at include/linux/namei.h:57 [inline]
do_sys_truncate+0xa3/0x190 fs/open.c:133
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:145
x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888120a86070
which belongs to the cache f2fs_extent_tree of size 80
The buggy address is located 40 bytes inside of
80-byte region [ffff888120a86070, ffff888120a860c0)
The buggy address belongs to the page:
page:ffffea000482a180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120a86
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff8881081f8d80
raw: 0000000000000000 0000000080240024 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 422, ts 38544235908, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
__alloc_pages+0x18f/0x440 mm/page_alloc.c:5808
alloc_slab_page mm/slub.c:-1 [inline]
allocate_slab mm/slub.c:1937 [inline]
new_slab+0xa1/0x4d0 mm/slub.c:2000
___slab_alloc+0x381/0x810 mm/slub.c:3033
__slab_alloc+0x49/0x90 mm/slub.c:3120
slab_alloc_node mm/slub.c:3211 [inline]
slab_alloc mm/slub.c:3255 [inline]
kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
__grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
__f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
f2fs_init_extent_tree+0x4b9/0xc70 fs/f2fs/extent_cache.c:404
do_read_inode fs/f2fs/inode.c:404 [inline]
f2fs_iget+0x13c9/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
page_owner free stack trace missing
Memory state around the buggy address:
ffff888120a85f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888120a86000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fa fb
>ffff888120a86080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff888120a86100: fc fc fc fc fc fc fc fc fc fc 00 00 00 00 00 00
ffff888120a86180: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
F2FS-fs (loop5): sanity_check_inode: inode (ino=8) extent info [14338, 0, 2147549187] is incorrect, run fsck to fix
==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3526 [inline]
BUG: KASAN: double-free or invalid-free in kmem_cache_free+0x100/0x320 mm/slub.c:3544
CPU: 1 PID: 435 Comm: syz.5.17 Tainted: G B syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
kasan_report_invalid_free+0x58/0x90 mm/kasan/report.c:370
____kasan_slab_free+0x13d/0x160 mm/kasan/common.c:-1
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
slab_free mm/slub.c:3526 [inline]
kmem_cache_free+0x100/0x320 mm/slub.c:3544
f2fs_destroy_extent_tree+0x2c0/0x4b0 fs/f2fs/extent_cache.c:845
f2fs_evict_inode+0x4f0/0x1600 fs/f2fs/inode.c:812
evict+0x485/0x870 fs/inode.c:650
iput_final fs/inode.c:1779 [inline]
iput+0x635/0x7c0 fs/inode.c:1805
iget_failed+0x17a/0x1c0 fs/bad_inode.c:250
f2fs_iget+0x1aeb/0x5230 fs/f2fs/inode.c:600
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
lookup_open fs/namei.c:3448 [inline]
open_last_lookups fs/namei.c:3540 [inline]
path_openat+0xfcf/0x2f10 fs/namei.c:3747
do_filp_open+0x1b3/0x3e0 fs/namei.c:3777
do_sys_openat2+0x14c/0x7b0 fs/open.c:1236
do_sys_open fs/open.c:1252 [inline]
__do_sys_openat fs/open.c:1268 [inline]
__se_sys_openat fs/open.c:1263 [inline]
__x64_sys_openat+0x136/0x160 fs/open.c:1263
x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f76f640c749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f76f625b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f76f6663090 RCX: 00007f76f640c749
RDX: 0000000000101000 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f76f6490f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f76f6663128 R14: 00007f76f6663090 R15: 00007fff917ae288
</TASK>
Allocated by task 422:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
__kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:217 [inline]
slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
slab_alloc_node mm/slub.c:3245 [inline]
slab_alloc mm/slub.c:3255 [inline]
kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
__grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
__f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
f2fs_init_extent_tree+0x4b9/0xc70 fs/f2fs/extent_cache.c:404
do_read_inode fs/f2fs/inode.c:404 [inline]
f2fs_iget+0x13c9/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
user_path_at_empty+0x47/0x1c0 fs/namei.c:2891
user_path_at include/linux/namei.h:57 [inline]
do_sys_truncate+0xa3/0x190 fs/open.c:133
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:145
x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 422:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
slab_free mm/slub.c:3526 [inline]
kmem_cache_free+0x100/0x320 mm/slub.c:3544
f2fs_destroy_extent_tree+0x2c0/0x4b0 fs/f2fs/extent_cache.c:845
f2fs_evict_inode+0x4f0/0x1600 fs/f2fs/inode.c:812
evict+0x485/0x870 fs/inode.c:650
iput_final fs/inode.c:1779 [inline]
iput+0x635/0x7c0 fs/inode.c:1805
iget_failed+0x17a/0x1c0 fs/bad_inode.c:250
f2fs_iget+0x1aeb/0x5230 fs/f2fs/inode.c:600
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
user_path_at_empty+0x47/0x1c0 fs/namei.c:2891
user_path_at include/linux/namei.h:57 [inline]
do_sys_truncate+0xa3/0x190 fs/open.c:133
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:145
x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888120a86070
which belongs to the cache f2fs_extent_tree of size 80
The buggy address is located 0 bytes inside of
80-byte region [ffff888120a86070, ffff888120a860c0)
The buggy address belongs to the page:
page:ffffea000482a180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120a86
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff8881081f8d80
raw: 0000000000000000 0000000080240024 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 422, ts 38544235908, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
__alloc_pages+0x18f/0x440 mm/page_alloc.c:5808
alloc_slab_page mm/slub.c:-1 [inline]
allocate_slab mm/slub.c:1937 [inline]
new_slab+0xa1/0x4d0 mm/slub.c:2000
___slab_alloc+0x381/0x810 mm/slub.c:3033
__slab_alloc+0x49/0x90 mm/slub.c:3120
slab_alloc_node mm/slub.c:3211 [inline]
slab_alloc mm/slub.c:3255 [inline]
kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
__grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
__f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
f2fs_init_extent_tree+0x4b9/0xc70 fs/f2fs/extent_cache.c:404
do_read_inode fs/f2fs/inode.c:404 [inline]
f2fs_iget+0x13c9/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
page_owner free stack trace missing
Memory state around the buggy address:
ffff888120a85f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888120a85f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888120a86000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fa fb
^
ffff888120a86080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888120a86100: fc fc fc fc fc fc fc fc fc fc fa 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 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.
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: 050dc55b0457 Revert "net/sched: act_connmark: handle errno..
git tree: android13-5.15-lts
console output: https://syzkaller.appspot.com/x/log.txt?x=10072f92580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7c25e09ce0f4abfd
dashboard link: https://syzkaller.appspot.com/bug?extid=4caab9eb365b68860e2e
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12faae9a580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11902074580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/45501ad7c8cb/disk-050dc55b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/008893f41078/vmlinux-050dc55b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c805ce08e8e/bzImage-050dc55b.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7c352555a185/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=16902074580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4caab9...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in sanity_check_inode fs/f2fs/inode.c:287 [inline]
BUG: KASAN: use-after-free in do_read_inode fs/f2fs/inode.c:427 [inline]
BUG: KASAN: use-after-free in f2fs_iget+0x487c/0x5230 fs/f2fs/inode.c:539
Read of size 4 at addr ffff888120a86098 by task syz.5.17/435
CPU: 1 PID: 435 Comm: syz.5.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:427 [inline]
kasan_report+0xf1/0x140 mm/kasan/report.c:444
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
sanity_check_inode fs/f2fs/inode.c:287 [inline]
do_read_inode fs/f2fs/inode.c:427 [inline]
f2fs_iget+0x487c/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
lookup_open fs/namei.c:3448 [inline]
open_last_lookups fs/namei.c:3540 [inline]
path_openat+0xfcf/0x2f10 fs/namei.c:3747
do_filp_open+0x1b3/0x3e0 fs/namei.c:3777
do_sys_openat2+0x14c/0x7b0 fs/open.c:1236
do_sys_open fs/open.c:1252 [inline]
__do_sys_openat fs/open.c:1268 [inline]
__se_sys_openat fs/open.c:1263 [inline]
__x64_sys_openat+0x136/0x160 fs/open.c:1263
x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f76f640c749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f76f625b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f76f6663090 RCX: 00007f76f640c749
RDX: 0000000000101000 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f76f6490f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f76f6663128 R14: 00007f76f6663090 R15: 00007fff917ae288
</TASK>
Allocated by task 422:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
__kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:217 [inline]
slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
slab_alloc_node mm/slub.c:3245 [inline]
slab_alloc mm/slub.c:3255 [inline]
kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
__grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
__f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
f2fs_init_extent_tree+0x4b9/0xc70 fs/f2fs/extent_cache.c:404
do_read_inode fs/f2fs/inode.c:404 [inline]
f2fs_iget+0x13c9/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
user_path_at_empty+0x47/0x1c0 fs/namei.c:2891
user_path_at include/linux/namei.h:57 [inline]
do_sys_truncate+0xa3/0x190 fs/open.c:133
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:145
x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 422:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
slab_free mm/slub.c:3526 [inline]
kmem_cache_free+0x100/0x320 mm/slub.c:3544
f2fs_destroy_extent_tree+0x2c0/0x4b0 fs/f2fs/extent_cache.c:845
f2fs_evict_inode+0x4f0/0x1600 fs/f2fs/inode.c:812
evict+0x485/0x870 fs/inode.c:650
iput_final fs/inode.c:1779 [inline]
iput+0x635/0x7c0 fs/inode.c:1805
iget_failed+0x17a/0x1c0 fs/bad_inode.c:250
f2fs_iget+0x1aeb/0x5230 fs/f2fs/inode.c:600
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
user_path_at_empty+0x47/0x1c0 fs/namei.c:2891
user_path_at include/linux/namei.h:57 [inline]
do_sys_truncate+0xa3/0x190 fs/open.c:133
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:145
x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888120a86070
which belongs to the cache f2fs_extent_tree of size 80
The buggy address is located 40 bytes inside of
80-byte region [ffff888120a86070, ffff888120a860c0)
The buggy address belongs to the page:
page:ffffea000482a180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120a86
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff8881081f8d80
raw: 0000000000000000 0000000080240024 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 422, ts 38544235908, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
__alloc_pages+0x18f/0x440 mm/page_alloc.c:5808
alloc_slab_page mm/slub.c:-1 [inline]
allocate_slab mm/slub.c:1937 [inline]
new_slab+0xa1/0x4d0 mm/slub.c:2000
___slab_alloc+0x381/0x810 mm/slub.c:3033
__slab_alloc+0x49/0x90 mm/slub.c:3120
slab_alloc_node mm/slub.c:3211 [inline]
slab_alloc mm/slub.c:3255 [inline]
kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
__grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
__f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
f2fs_init_extent_tree+0x4b9/0xc70 fs/f2fs/extent_cache.c:404
do_read_inode fs/f2fs/inode.c:404 [inline]
f2fs_iget+0x13c9/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
page_owner free stack trace missing
Memory state around the buggy address:
ffff888120a85f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888120a86000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fa fb
>ffff888120a86080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff888120a86100: fc fc fc fc fc fc fc fc fc fc 00 00 00 00 00 00
ffff888120a86180: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
F2FS-fs (loop5): sanity_check_inode: inode (ino=8) extent info [14338, 0, 2147549187] is incorrect, run fsck to fix
==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3526 [inline]
BUG: KASAN: double-free or invalid-free in kmem_cache_free+0x100/0x320 mm/slub.c:3544
CPU: 1 PID: 435 Comm: syz.5.17 Tainted: G B syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
kasan_report_invalid_free+0x58/0x90 mm/kasan/report.c:370
____kasan_slab_free+0x13d/0x160 mm/kasan/common.c:-1
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
slab_free mm/slub.c:3526 [inline]
kmem_cache_free+0x100/0x320 mm/slub.c:3544
f2fs_destroy_extent_tree+0x2c0/0x4b0 fs/f2fs/extent_cache.c:845
f2fs_evict_inode+0x4f0/0x1600 fs/f2fs/inode.c:812
evict+0x485/0x870 fs/inode.c:650
iput_final fs/inode.c:1779 [inline]
iput+0x635/0x7c0 fs/inode.c:1805
iget_failed+0x17a/0x1c0 fs/bad_inode.c:250
f2fs_iget+0x1aeb/0x5230 fs/f2fs/inode.c:600
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
lookup_open fs/namei.c:3448 [inline]
open_last_lookups fs/namei.c:3540 [inline]
path_openat+0xfcf/0x2f10 fs/namei.c:3747
do_filp_open+0x1b3/0x3e0 fs/namei.c:3777
do_sys_openat2+0x14c/0x7b0 fs/open.c:1236
do_sys_open fs/open.c:1252 [inline]
__do_sys_openat fs/open.c:1268 [inline]
__se_sys_openat fs/open.c:1263 [inline]
__x64_sys_openat+0x136/0x160 fs/open.c:1263
x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f76f640c749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f76f625b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f76f6663090 RCX: 00007f76f640c749
RDX: 0000000000101000 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f76f6490f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f76f6663128 R14: 00007f76f6663090 R15: 00007fff917ae288
</TASK>
Allocated by task 422:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:433 [inline]
__kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466
kasan_slab_alloc include/linux/kasan.h:217 [inline]
slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
slab_alloc_node mm/slub.c:3245 [inline]
slab_alloc mm/slub.c:3255 [inline]
kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
__grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
__f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
f2fs_init_extent_tree+0x4b9/0xc70 fs/f2fs/extent_cache.c:404
do_read_inode fs/f2fs/inode.c:404 [inline]
f2fs_iget+0x13c9/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
user_path_at_empty+0x47/0x1c0 fs/namei.c:2891
user_path_at include/linux/namei.h:57 [inline]
do_sys_truncate+0xa3/0x190 fs/open.c:133
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:145
x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Freed by task 422:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
kasan_slab_free include/linux/kasan.h:193 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
slab_free mm/slub.c:3526 [inline]
kmem_cache_free+0x100/0x320 mm/slub.c:3544
f2fs_destroy_extent_tree+0x2c0/0x4b0 fs/f2fs/extent_cache.c:845
f2fs_evict_inode+0x4f0/0x1600 fs/f2fs/inode.c:812
evict+0x485/0x870 fs/inode.c:650
iput_final fs/inode.c:1779 [inline]
iput+0x635/0x7c0 fs/inode.c:1805
iget_failed+0x17a/0x1c0 fs/bad_inode.c:250
f2fs_iget+0x1aeb/0x5230 fs/f2fs/inode.c:600
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
user_path_at_empty+0x47/0x1c0 fs/namei.c:2891
user_path_at include/linux/namei.h:57 [inline]
do_sys_truncate+0xa3/0x190 fs/open.c:133
__do_sys_truncate fs/open.c:147 [inline]
__se_sys_truncate fs/open.c:145 [inline]
__x64_sys_truncate+0x5b/0x70 fs/open.c:145
x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:77
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888120a86070
which belongs to the cache f2fs_extent_tree of size 80
The buggy address is located 0 bytes inside of
80-byte region [ffff888120a86070, ffff888120a860c0)
The buggy address belongs to the page:
page:ffffea000482a180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120a86
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff8881081f8d80
raw: 0000000000000000 0000000080240024 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 422, ts 38544235908, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
__alloc_pages+0x18f/0x440 mm/page_alloc.c:5808
alloc_slab_page mm/slub.c:-1 [inline]
allocate_slab mm/slub.c:1937 [inline]
new_slab+0xa1/0x4d0 mm/slub.c:2000
___slab_alloc+0x381/0x810 mm/slub.c:3033
__slab_alloc+0x49/0x90 mm/slub.c:3120
slab_alloc_node mm/slub.c:3211 [inline]
slab_alloc mm/slub.c:3255 [inline]
kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:-1 [inline]
__grab_extent_tree fs/f2fs/extent_cache.c:295 [inline]
__f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline]
f2fs_init_extent_tree+0x4b9/0xc70 fs/f2fs/extent_cache.c:404
do_read_inode fs/f2fs/inode.c:404 [inline]
f2fs_iget+0x13c9/0x5230 fs/f2fs/inode.c:539
f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:493
__lookup_slow+0x2aa/0x3e0 fs/namei.c:1671
lookup_slow+0x57/0x70 fs/namei.c:1688
walk_component+0x325/0x460 fs/namei.c:1984
lookup_last fs/namei.c:2439 [inline]
path_lookupat+0x180/0x490 fs/namei.c:2463
filename_lookup+0x1e2/0x4f0 fs/namei.c:2492
page_owner free stack trace missing
Memory state around the buggy address:
ffff888120a85f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888120a85f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888120a86000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fa fb
^
ffff888120a86080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888120a86100: fc fc fc fc fc fc fc fc fc fc fa fb fb fb fb fb
==================================================================
---
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