loop9: detected capacity change from 0 to 512
==================================================================
BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:-1 [inline]
BUG: KASAN: use-after-free in __ext4_iget+0x2bb/0x3e50 fs/ext4/inode.c:4722
Read of size 8 at addr ffff88810994c1a8 by task syz.9.2550/8525
CPU: 0 PID: 8525 Comm: syz.9.2550 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 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_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
check_igot_inode fs/ext4/inode.c:-1 [inline]
__ext4_iget+0x2bb/0x3e50 fs/ext4/inode.c:4722
ext4_quota_enable fs/ext4/super.c:6435 [inline]
ext4_enable_quotas+0x33c/0x6d0 fs/ext4/super.c:6471
ext4_fill_super+0x8301/0x8bd0 fs/ext4/super.c:4982
mount_bdev+0x2ae/0x3e0 fs/super.c:1400
ext4_mount+0x34/0x40 fs/ext4/super.c:6650
legacy_get_tree+0xed/0x190 fs/fs_context.c:611
vfs_get_tree+0x89/0x260 fs/super.c:1530
do_new_mount+0x25a/0xa20 fs/namespace.c:3034
path_mount+0x659/0xff0 fs/namespace.c:3364
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x320/0x390 fs/namespace.c:3562
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3562
x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
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: 0033:0x7f4f23a610ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 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:00007f4f224b9e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4f224b9ee0 RCX: 00007f4f23a610ca
RDX: 0000200000000000 RSI: 00002000000000c0 RDI: 00007f4f224b9ea0
RBP: 0000200000000000 R08: 00007f4f224b9ee0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007f4f224b9ea0 R14: 00000000000004fd R15: 0000200000000100
Allocated by task 8415:
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:2817 [inline]
f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1459
alloc_inode fs/inode.c:264 [inline]
iget_locked+0x16c/0x7e0 fs/inode.c:1318
f2fs_iget+0x55/0x5060 fs/f2fs/inode.c:517
f2fs_fill_super+0x3d0e/0x6dc0 fs/f2fs/super.c:4347
mount_bdev+0x2ae/0x3e0 fs/super.c:1400
f2fs_mount+0x34/0x40 fs/f2fs/super.c:4708
legacy_get_tree+0xed/0x190 fs/fs_context.c:611
vfs_get_tree+0x89/0x260 fs/super.c:1530
do_new_mount+0x25a/0xa20 fs/namespace.c:3034
path_mount+0x659/0xff0 fs/namespace.c:3364
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x320/0x390 fs/namespace.c:3562
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3562
x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
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 0:
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_free_inode+0x24/0x30 fs/f2fs/super.c:1607
i_callback+0x4c/0x70 fs/inode.c:253
rcu_do_batch+0x532/0xbe0 kernel/rcu/tree.c:2523
rcu_core+0x5ee/0xf80 kernel/rcu/tree.c:2763
rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776
handle_softirqs+0x250/0x560 kernel/softirq.c:583
__do_softirq kernel/softirq.c:621 [inline]
invoke_softirq kernel/softirq.c:443 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
__kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
__call_rcu_common kernel/rcu/tree.c:3011 [inline]
call_rcu+0x10b/0xf80 kernel/rcu/tree.c:3129
destroy_inode fs/inode.c:319 [inline]
evict+0x834/0x8d0 fs/inode.c:665
iput_final fs/inode.c:1779 [inline]
iput+0x635/0x7c0 fs/inode.c:1805
f2fs_put_super+0x6a2/0xc10 fs/f2fs/super.c:1693
generic_shutdown_super+0x151/0x330 fs/super.c:475
kill_block_super+0x7f/0xf0 fs/super.c:1427
kill_f2fs_super+0x303/0x3b0 fs/f2fs/super.c:4740
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x45b/0x510 fs/namespace.c:1148
__cleanup_mnt+0x19/0x20 fs/namespace.c:1155
task_work_run+0x127/0x190 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
__kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
__call_rcu_common kernel/rcu/tree.c:3011 [inline]
call_rcu+0x10b/0xf80 kernel/rcu/tree.c:3129
destroy_inode fs/inode.c:319 [inline]
evict+0x834/0x8d0 fs/inode.c:665
iput_final fs/inode.c:1779 [inline]
iput+0x635/0x7c0 fs/inode.c:1805
f2fs_put_super+0x6a2/0xc10 fs/f2fs/super.c:1693
generic_shutdown_super+0x151/0x330 fs/super.c:475
kill_block_super+0x7f/0xf0 fs/super.c:1427
kill_f2fs_super+0x303/0x3b0 fs/f2fs/super.c:4740
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x45b/0x510 fs/namespace.c:1148
__cleanup_mnt+0x19/0x20 fs/namespace.c:1155
task_work_run+0x127/0x190 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff88810994bca0
which belongs to the cache f2fs_inode_cache of size 1424
The buggy address is located 1288 bytes inside of
1424-byte region [ffff88810994bca0, ffff88810994c230)
The buggy address belongs to the page:
page:ffffea0004265200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109948
head:ffffea0004265200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea0004ced800 0000000200000002 ffff8881081f4900
raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 320, ts 26526778468, 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+0x2d3a/0x2dc0 mm/page_alloc.c:4485
__alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822
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:2817 [inline]
f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1459
alloc_inode fs/inode.c:264 [inline]
iget_locked+0x16c/0x7e0 fs/inode.c:1318
f2fs_iget+0x55/0x5060 fs/f2fs/inode.c:517
f2fs_fill_super+0x3d0e/0x6dc0 fs/f2fs/super.c:4347
mount_bdev+0x2ae/0x3e0 fs/super.c:1400
f2fs_mount+0x34/0x40 fs/f2fs/super.c:4708
legacy_get_tree+0xed/0x190 fs/fs_context.c:611
vfs_get_tree+0x89/0x260 fs/super.c:1530
page_owner free stack trace missing
Memory state around the buggy address:
ffff88810994c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88810994c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810994c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88810994c200: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
ffff88810994c280: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs warning (device loop9): ext4_enable_quotas:6479: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.
EXT4-fs (loop9): mount failed
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 8525 Comm: syz.9.2550 Tainted: G B syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
dump_stack+0x15/0x20 lib/dump_stack.c:113
fail_dump lib/fault-inject.c:52 [inline]
should_fail+0x3c1/0x510 lib/fault-inject.c:146
should_fail_usercopy+0x1a/0x20 lib/fault-inject-usercopy.c:37
_copy_from_user+0x20/0xd0 lib/usercopy.c:15
copy_from_user include/linux/uaccess.h:192 [inline]
memdup_user mm/util.c:181 [inline]
strndup_user+0xb1/0x150 mm/util.c:236
copy_mount_string fs/namespace.c:3272 [inline]
__do_sys_mount fs/namespace.c:3570 [inline]
__se_sys_mount+0x9c/0x390 fs/namespace.c:3562
__x64_sys_mount+0xbf/0xd0 fs/namespace.c:3562
x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
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: 0033:0x7f4f23a5fe59
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:00007f4f224ba028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4f23cd8fa0 RCX: 00007f4f23a5fe59
RDX: 0000200000000440 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f4f224ba090 R08: 0000200000000040 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f4f23cd9038 R14: 00007f4f23cd8fa0 R15: 00007ffe8ccc5618