gfs2: fsid=syz:syz.0: first mount done, others may mount
gfs2: fsid=syz:syz.0: found 1 quota changes
==================================================================
BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x151/0x190 lib/list_debug.c:32
Read of size 8 at addr ffff888051ac41c8 by task syz.3.1975/14599

CPU: 0 UID: 0 PID: 14599 Comm: syz.3.1975 Not tainted 6.16.0-rc3-syzkaller-00116-ge34a79b96ab9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xcd/0x680 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 __list_add_valid_or_report+0x151/0x190 lib/list_debug.c:32
 __list_add_valid include/linux/list.h:88 [inline]
 __list_add include/linux/list.h:150 [inline]
 list_add_tail include/linux/list.h:183 [inline]
 list_lru_add+0xf6/0x2e0 mm/list_lru.c:167
 list_lru_add_obj+0x1ad/0x320 mm/list_lru.c:189
 qd_put+0x119/0x190 fs/gfs2/quota.c:342
 gfs2_quota_sync+0x358/0x570 fs/gfs2/quota.c:1361
 gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:660
 sync_filesystem+0x111/0x290 fs/sync.c:56
 gfs2_reconfigure+0xca/0xf10 fs/gfs2/ops_fstype.c:1555
 reconfigure_super+0x450/0xb60 fs/super.c:1077
 do_remount fs/namespace.c:3386 [inline]
 path_mount+0x17cb/0x2020 fs/namespace.c:4218
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount fs/namespace.c:4427 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d039900ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6d04870e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6d04870ef0 RCX: 00007f6d039900ca
RDX: 0000200000000f40 RSI: 0000200000000f00 RDI: 0000000000000000
RBP: 0000200000000f40 R08: 00007f6d04870ef0 R09: 0000000001a4ec39
R10: 0000000001a4ec39 R11: 0000000000000246 R12: 0000200000000f00
R13: 00007f6d04870eb0 R14: 0000000000000000 R15: 0000200000000100
 </TASK>

Allocated by task 14486:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4148 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4204
 qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
 gfs2_quota_init+0x66d/0x13f0 fs/gfs2/quota.c:1448
 gfs2_make_fs_rw+0x1ce/0x380 fs/gfs2/super.c:149
 gfs2_fill_super+0x2d08/0x2d60 fs/gfs2/ops_fstype.c:1278
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1681
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1335
 vfs_get_tree+0x8e/0x340 fs/super.c:1804
 do_new_mount fs/namespace.c:3902 [inline]
 path_mount+0x1414/0x2020 fs/namespace.c:4226
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount fs/namespace.c:4427 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 23:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2381 [inline]
 slab_free mm/slub.c:4643 [inline]
 kmem_cache_free+0x2d1/0x4d0 mm/slub.c:4745
 gfs2_qd_dealloc+0x69/0xf0 fs/gfs2/quota.c:111
 rcu_do_batch kernel/rcu/tree.c:2576 [inline]
 rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2832
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 run_ksoftirqd kernel/softirq.c:968 [inline]
 run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960
 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:164
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548
 __call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3094
 qd_put+0x153/0x190 fs/gfs2/quota.c:337
 gfs2_quota_sync+0x358/0x570 fs/gfs2/quota.c:1361
 gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:660
 sync_filesystem+0x111/0x290 fs/sync.c:56
 gfs2_reconfigure+0xca/0xf10 fs/gfs2/ops_fstype.c:1555
 reconfigure_super+0x450/0xb60 fs/super.c:1077
 do_remount fs/namespace.c:3386 [inline]
 path_mount+0x17cb/0x2020 fs/namespace.c:4218
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount fs/namespace.c:4427 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888051ac4150
 which belongs to the cache gfs2_quotad of size 272
The buggy address is located 120 bytes inside of
 freed 272-byte region [ffff888051ac4150, ffff888051ac4260)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888051ac4000 pfn:0x51ac4
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff888020b388c0 dead000000000122 0000000000000000
raw: ffff888051ac4000 00000000800c000b 00000000f5000000 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 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 13778, tgid 13776 (syz.3.1831), ts 1270114207478, free_ts 1245555184572
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
 alloc_slab_page mm/slub.c:2451 [inline]
 allocate_slab mm/slub.c:2619 [inline]
 new_slab+0x23b/0x330 mm/slub.c:2673
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
 __slab_alloc_node mm/slub.c:4024 [inline]
 slab_alloc_node mm/slub.c:4185 [inline]
 kmem_cache_alloc_noprof+0xef/0x3b0 mm/slub.c:4204
 qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
 gfs2_quota_init+0x66d/0x13f0 fs/gfs2/quota.c:1448
 gfs2_make_fs_rw+0x1ce/0x380 fs/gfs2/super.c:149
 gfs2_fill_super+0x2d08/0x2d60 fs/gfs2/ops_fstype.c:1278
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1681
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1335
 vfs_get_tree+0x8e/0x340 fs/super.c:1804
 do_new_mount fs/namespace.c:3902 [inline]
 path_mount+0x1414/0x2020 fs/namespace.c:4226
page last free pid 6218 tgid 6218 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1248 [inline]
 __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4148 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4204
 getname_flags.part.0+0x4c/0x550 fs/namei.c:146
 getname_flags+0x93/0xf0 include/linux/audit.h:322
 user_path_at+0x24/0x60 fs/namei.c:3135
 ksys_umount fs/namespace.c:2147 [inline]
 __do_sys_umount fs/namespace.c:2155 [inline]
 __se_sys_umount fs/namespace.c:2153 [inline]
 __x64_sys_umount+0x10a/0x1a0 fs/namespace.c:2153
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888051ac4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888051ac4100: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb
>ffff888051ac4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888051ac4200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888051ac4280: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in __list_add include/linux/list.h:156 [inline]
BUG: KASAN: slab-use-after-free in list_add_tail include/linux/list.h:183 [inline]
BUG: KASAN: slab-use-after-free in list_lru_add+0x284/0x2e0 mm/list_lru.c:167
Write of size 8 at addr ffff888051ac41c8 by task syz.3.1975/14599

CPU: 0 UID: 0 PID: 14599 Comm: syz.3.1975 Tainted: G    B               6.16.0-rc3-syzkaller-00116-ge34a79b96ab9 #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xcd/0x680 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 __list_add include/linux/list.h:156 [inline]
 list_add_tail include/linux/list.h:183 [inline]
 list_lru_add+0x284/0x2e0 mm/list_lru.c:167
 list_lru_add_obj+0x1ad/0x320 mm/list_lru.c:189
 qd_put+0x119/0x190 fs/gfs2/quota.c:342
 gfs2_quota_sync+0x358/0x570 fs/gfs2/quota.c:1361
 gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:660
 sync_filesystem+0x111/0x290 fs/sync.c:56
 gfs2_reconfigure+0xca/0xf10 fs/gfs2/ops_fstype.c:1555
 reconfigure_super+0x450/0xb60 fs/super.c:1077
 do_remount fs/namespace.c:3386 [inline]
 path_mount+0x17cb/0x2020 fs/namespace.c:4218
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount fs/namespace.c:4427 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d039900ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6d04870e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6d04870ef0 RCX: 00007f6d039900ca
RDX: 0000200000000f40 RSI: 0000200000000f00 RDI: 0000000000000000
RBP: 0000200000000f40 R08: 00007f6d04870ef0 R09: 0000000001a4ec39
R10: 0000000001a4ec39 R11: 0000000000000246 R12: 0000200000000f00
R13: 00007f6d04870eb0 R14: 0000000000000000 R15: 0000200000000100
 </TASK>

Allocated by task 14486:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4148 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4204
 qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
 gfs2_quota_init+0x66d/0x13f0 fs/gfs2/quota.c:1448
 gfs2_make_fs_rw+0x1ce/0x380 fs/gfs2/super.c:149
 gfs2_fill_super+0x2d08/0x2d60 fs/gfs2/ops_fstype.c:1278
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1681
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1335
 vfs_get_tree+0x8e/0x340 fs/super.c:1804
 do_new_mount fs/namespace.c:3902 [inline]
 path_mount+0x1414/0x2020 fs/namespace.c:4226
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount fs/namespace.c:4427 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 23:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2381 [inline]
 slab_free mm/slub.c:4643 [inline]
 kmem_cache_free+0x2d1/0x4d0 mm/slub.c:4745
 gfs2_qd_dealloc+0x69/0xf0 fs/gfs2/quota.c:111
 rcu_do_batch kernel/rcu/tree.c:2576 [inline]
 rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2832
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 run_ksoftirqd kernel/softirq.c:968 [inline]
 run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960
 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:164
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548
 __call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3094
 qd_put+0x153/0x190 fs/gfs2/quota.c:337
 gfs2_quota_sync+0x358/0x570 fs/gfs2/quota.c:1361
 gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:660
 sync_filesystem+0x111/0x290 fs/sync.c:56
 gfs2_reconfigure+0xca/0xf10 fs/gfs2/ops_fstype.c:1555
 reconfigure_super+0x450/0xb60 fs/super.c:1077
 do_remount fs/namespace.c:3386 [inline]
 path_mount+0x17cb/0x2020 fs/namespace.c:4218
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount fs/namespace.c:4427 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888051ac4150
 which belongs to the cache gfs2_quotad of size 272
The buggy address is located 120 bytes inside of
 freed 272-byte region [ffff888051ac4150, ffff888051ac4260)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888051ac4000 pfn:0x51ac4
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff888020b388c0 dead000000000122 0000000000000000
raw: ffff888051ac4000 00000000800c000b 00000000f5000000 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 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 13778, tgid 13776 (syz.3.1831), ts 1270114207478, free_ts 1245555184572
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
 alloc_slab_page mm/slub.c:2451 [inline]
 allocate_slab mm/slub.c:2619 [inline]
 new_slab+0x23b/0x330 mm/slub.c:2673
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
 __slab_alloc_node mm/slub.c:4024 [inline]
 slab_alloc_node mm/slub.c:4185 [inline]
 kmem_cache_alloc_noprof+0xef/0x3b0 mm/slub.c:4204
 qd_alloc+0x4e/0x2f0 fs/gfs2/quota.c:234
 gfs2_quota_init+0x66d/0x13f0 fs/gfs2/quota.c:1448
 gfs2_make_fs_rw+0x1ce/0x380 fs/gfs2/super.c:149
 gfs2_fill_super+0x2d08/0x2d60 fs/gfs2/ops_fstype.c:1278
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1681
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1335
 vfs_get_tree+0x8e/0x340 fs/super.c:1804
 do_new_mount fs/namespace.c:3902 [inline]
 path_mount+0x1414/0x2020 fs/namespace.c:4226
page last free pid 6218 tgid 6218 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1248 [inline]
 __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4148 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4204
 getname_flags.part.0+0x4c/0x550 fs/namei.c:146
 getname_flags+0x93/0xf0 include/linux/audit.h:322
 user_path_at+0x24/0x60 fs/namei.c:3135
 ksys_umount fs/namespace.c:2147 [inline]
 __do_sys_umount fs/namespace.c:2155 [inline]
 __se_sys_umount fs/namespace.c:2153 [inline]
 __x64_sys_umount+0x10a/0x1a0 fs/namespace.c:2153
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888051ac4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888051ac4100: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb
>ffff888051ac4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888051ac4200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888051ac4280: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================