syzbot

==================================================================
BUG: KASAN: use-after-free in __up_write kernel/locking/rwsem.c:1366 [inline]
BUG: KASAN: use-after-free in up_write+0x80/0x5c0 kernel/locking/rwsem.c:1626
Read of size 8 at addr ffff0000f8424b30 by task gfs2_quotad/4639

CPU: 1 PID: 4639 Comm: gfs2_quotad Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0x100 mm/kasan/report.c:524
 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 __up_write kernel/locking/rwsem.c:1366 [inline]
 up_write+0x80/0x5c0 kernel/locking/rwsem.c:1626
 inode_unlock include/linux/fs.h:763 [inline]
 do_sync+0x840/0xa94 fs/gfs2/quota.c:984
 gfs2_quota_sync+0x2e0/0x528 fs/gfs2/quota.c:1329
 quotad_check_timeo fs/gfs2/quota.c:1519 [inline]
 gfs2_quotad+0x2d8/0x4fc fs/gfs2/quota.c:1566
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Allocated by task 4631:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x43c mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc_lru+0x1b0/0x298 mm/slub.c:3390
 alloc_inode_sb include/linux/fs.h:3245 [inline]
 gfs2_alloc_inode+0x58/0x110 fs/gfs2/super.c:1543
 alloc_inode fs/inode.c:261 [inline]
 iget5_locked+0xa4/0x228 fs/inode.c:1328
 gfs2_inode_lookup+0xe0/0xab0 fs/gfs2/inode.c:124
 gfs2_dir_search+0x148/0x204 fs/gfs2/dir.c:1664
 gfs2_lookupi+0x3bc/0x58c fs/gfs2/inode.c:323
 gfs2_lookup_simple+0xb0/0x100 fs/gfs2/inode.c:264
 init_inodes+0x178/0x2d4 fs/gfs2/ops_fstype.c:904
 gfs2_fill_super+0x122c/0x19ec fs/gfs2/ops_fstype.c:1246
 get_tree_bdev+0x358/0x544 fs/super.c:1366
 gfs2_get_tree+0x54/0x1b4 fs/gfs2/ops_fstype.c:1327
 vfs_get_tree+0x90/0x274 fs/super.c:1573
 do_new_mount+0x228/0x810 fs/namespace.c:3078
 path_mount+0x5b4/0xe78 fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Freed by task 4641:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516
 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 kmem_cache_free+0x11c/0x324 mm/slub.c:3709
 gfs2_free_inode+0x50/0x60 fs/gfs2/super.c:1557
 i_callback+0x50/0x78 fs/inode.c:250
 rcu_do_batch kernel/rcu/tree.c:2297 [inline]
 rcu_core+0x81c/0x18ac kernel/rcu/tree.c:2557
 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2574
 handle_softirqs+0x318/0xc6c kernel/softirq.c:596
 __do_softirq+0x14/0x20 kernel/softirq.c:630

Last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 call_rcu+0x100/0x954 kernel/rcu/tree.c:2849
 destroy_inode fs/inode.c:316 [inline]
 evict+0x748/0x810 fs/inode.c:720
 iput_final fs/inode.c:1834 [inline]
 iput+0x764/0x7f4 fs/inode.c:1860
 gfs2_put_super+0x330/0x764 fs/gfs2/super.c:616
 generic_shutdown_super+0x130/0x324 fs/super.c:501
 kill_block_super+0x70/0xdc fs/super.c:1470
 gfs2_kill_sb+0xc0/0xd4 fs/gfs2/ops_fstype.c:-1
 deactivate_locked_super+0xac/0x124 fs/super.c:332
 deactivate_super+0xe8/0x108 fs/super.c:363
 cleanup_mnt+0x37c/0x404 fs/namespace.c:1191
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198
 task_work_run+0x1ec/0x270 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x2038/0x2b28 arch/arm64/kernel/signal.c:1137
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000f84249e8
 which belongs to the cache gfs2_inode of size 1592
The buggy address is located 328 bytes inside of
 1592-byte region [ffff0000f84249e8, ffff0000f8425020)

The buggy address belongs to the physical page:
page:00000000e3dcef6e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x138420
head:00000000e3dcef6e order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff0000c3b8fa01
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c4bc8000
raw: 0000000000000000 0000000080130013 00000001ffffffff ffff0000c3b8fa01
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f8424a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000f8424a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000f8424b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff0000f8424b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000f8424c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Unable to handle kernel paging request at virtual address dfff800000000002
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000002] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4639 Comm: gfs2_quotad Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 02400005 (nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : do_sync+0x86c/0xa94 fs/gfs2/quota.c:986
lr : do_sync+0x860/0xa94 fs/gfs2/quota.c:986
sp : ffff8000219c7ac0
x29: ffff8000219c7c10 x28: ffff0000f84249e8 x27: ffff80000a1debc4
x26: 00000000fffffffb x25: ffff700004338f64 x24: dfff800000000000
x23: 0000000000000000 x22: ffff0000d54dfa00 x21: ffff0000d54dfa00
x20: 0000000000000000 x19: 0000000000000000 x18: ffff800011abbcc0
x17: 1fffe00033edbb7e x16: ffff800008042d90 x15: 0000000040000000
x14: 00000000ffff8000 x13: 00000000f21d0cde x12: 0000000000ff0100
x11: ff0080000804801c x10: 0000000000000000 x9 : ffff80001c326a90
x8 : 0000000000000002 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000001 x3 : ffff80000a1dcf98
x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000010
Call trace:
 do_sync+0x86c/0xa94 fs/gfs2/quota.c:986
 gfs2_quota_sync+0x2e0/0x528 fs/gfs2/quota.c:1329
 quotad_check_timeo fs/gfs2/quota.c:1519 [inline]
 gfs2_quotad+0x2d8/0x4fc fs/gfs2/quota.c:1566
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: 979be98a f9400294 91004280 d343fc08 (38786908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	979be98a 	bl	0xfffffffffe6fa628
   4:	f9400294 	ldr	x20, [x20]
   8:	91004280 	add	x0, x20, #0x10
   c:	d343fc08 	lsr	x8, x0, #3
* 10:	38786908 	ldrb	w8, [x8, x24] <-- trapping instruction