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KASAN: use-after-free Read in incfs_free_mount_info

Status: premoderation: reported on 2026/01/19 00:38
Reported-by: syzbot+6426652511ad5837a9f6@syzkaller.appspotmail.com
First crash: 12d, last: 13h47m
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 KASAN: use-after-free Read in incfs_free_mount_info 19 3 6d15h 12d 0/2 premoderation: reported on 2026/01/18 22:40
android-5-15 KASAN: use-after-free Read in incfs_free_mount_info 19 3 3d13h 6d13h 0/2 premoderation: reported on 2026/01/25 07:55

Sample crash report:
RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f162843571f
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc32680d30
R13: 00007f162843571f R14: 000055558e5124e8 R15: 00007ffc32681e00
---[ end trace 296499e1e4fb3479 ]---
==================================================================
BUG: KASAN: use-after-free in fast_dput+0x1e9/0x290 fs/dcache.c:750
Read of size 4 at addr ffff88812ca93660 by task syz-executor/507

CPU: 1 PID: 507 Comm: syz-executor Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0xe2/0x130 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 fast_dput+0x1e9/0x290 fs/dcache.c:750
 dput+0x21/0x80 fs/dcache.c:870
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1aa/0x210 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa90/0x2500 kernel/exit.c:872
 do_group_exit+0x141/0x310 kernel/exit.c:986
 __do_sys_exit_group kernel/exit.c:997 [inline]
 __se_sys_exit_group kernel/exit.c:995 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:995
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f16283cbeb9
Code: Unable to access opcode bytes at RIP 0x7f16283cbe8f.
RSP: 002b:00007ffc3267fa78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f16284357ae RCX: 00007f16283cbeb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f162843571f
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc32680d30
R13: 00007f162843571f R14: 000055558e5124e8 R15: 00007ffc32681e00

Allocated by task 566:
 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:430 [inline]
 __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580
 slab_alloc_node mm/slub.c:2952 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x162/0x2d0 mm/slub.c:2965
 __d_alloc+0x2d/0x6a0 fs/dcache.c:1714
 d_alloc fs/dcache.c:1793 [inline]
 d_alloc_parallel+0xdf/0x1380 fs/dcache.c:2549
 __lookup_slow+0x14c/0x410 fs/namei.c:1633
 lookup_one_len+0x196/0x2d0 fs/namei.c:2664
 incfs_lookup_dentry+0x60/0xb0 fs/incfs/data_mgmt.c:210
 open_or_create_special_dir+0x4f/0x1d0 fs/incfs/vfs.c:469
 incfs_mount_fs+0x434/0x8d0 fs/incfs/vfs.c:1867
 legacy_get_tree+0xed/0x190 fs/fs_context.c:593
 vfs_get_tree+0x89/0x260 fs/super.c:1572
 do_new_mount+0x25a/0xa20 fs/namespace.c:3006
 path_mount+0x585/0xc90 fs/namespace.c:3336
 do_mount fs/namespace.c:3349 [inline]
 __do_sys_mount fs/namespace.c:3557 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3534
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 574:
 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:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1600 [inline]
 slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626
 slab_free mm/slub.c:3208 [inline]
 kmem_cache_free+0x100/0x2d0 mm/slub.c:3224
 __d_free+0x23/0x30 fs/dcache.c:271
 rcu_do_batch+0x4ef/0xab0 kernel/rcu/tree.c:2494
 rcu_core+0x577/0xd80 kernel/rcu/tree.c:2735
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x255/0x563 kernel/softirq.c:309

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 kernel/rcu/tree.c:2980 [inline]
 call_rcu+0x11a/0x10b0 kernel/rcu/tree.c:3054
 dentry_free+0xbd/0x150 fs/dcache.c:-1
 __dentry_kill+0x50a/0x650 fs/dcache.c:597
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x42/0x80 fs/dcache.c:883
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1aa/0x210 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa90/0x2500 kernel/exit.c:872
 do_group_exit+0x141/0x310 kernel/exit.c:986
 __do_sys_exit_group kernel/exit.c:997 [inline]
 __se_sys_exit_group kernel/exit.c:995 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:995
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88812ca93660
 which belongs to the cache dentry of size 208
The buggy address is located 0 bytes inside of
 208-byte region [ffff88812ca93660, ffff88812ca93730)
The buggy address belongs to the page:
page:ffffea0004b2a4c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12ca93
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff88810018aa80
raw: 0000000000000000 00000000000f000f 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 0x112cd0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_RECLAIMABLE), pid 564, ts 33570786553, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x179/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5370
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2a6/0x450 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x1ac/0x2d0 mm/slub.c:2965
 __d_alloc+0x2d/0x6a0 fs/dcache.c:1714
 d_alloc+0x4b/0x260 fs/dcache.c:1793
 __lookup_hash+0xcb/0x250 fs/namei.c:1545
 filename_create+0x1d5/0x680 fs/namei.c:3616
 user_path_create fs/namei.c:3673 [inline]
 do_symlinkat+0x8c/0x3b0 fs/namei.c:4127
 __do_sys_symlinkat fs/namei.c:4148 [inline]
 __se_sys_symlinkat fs/namei.c:4145 [inline]
 __x64_sys_symlinkat+0x7b/0x90 fs/namei.c:4145
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88812ca93500: fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00
 ffff88812ca93580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812ca93600: 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb
                                                       ^
 ffff88812ca93680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812ca93700: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 507 at fs/dcache.c:766 fast_dput+0x210/0x290 fs/dcache.c:766
Modules linked in:
CPU: 0 PID: 507 Comm: syz-executor Tainted: G    B   W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:fast_dput+0x210/0x290 fs/dcache.c:766
Code: d5 f2 ff e9 46 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 99 fe ff ff 48 89 df e8 8a d5 f2 ff e9 8c fe ff ff e8 00 58 b8 ff <0f> 0b e9 0b ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c e4 fe ff
RSP: 0018:ffffc90000b67b60 EFLAGS: 00010293
RAX: ffffffff81ac5dd0 RBX: ffff88812ca93660 RCX: ffff8881171f3b40
RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001
RBP: ffffc90000b67b90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200016cf5c R12: 00000000ffffff80
R13: dffffc0000000000 R14: ffff88812ca936b8 R15: 1ffff110259526d7
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc356ca2000 CR3: 000000010d69c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dput+0x21/0x80 fs/dcache.c:870
 incfs_free_mount_info+0x60/0x200 fs/incfs/data_mgmt.c:166
 incfs_kill_sb+0x1aa/0x210 fs/incfs/vfs.c:1979
 deactivate_locked_super+0xa0/0x100 fs/super.c:335
 deactivate_super+0xaf/0xe0 fs/super.c:366
 cleanup_mnt+0x45b/0x510 fs/namespace.c:1123
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1130
 task_work_run+0x127/0x190 kernel/task_work.c:189
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xa90/0x2500 kernel/exit.c:872
 do_group_exit+0x141/0x310 kernel/exit.c:986
 __do_sys_exit_group kernel/exit.c:997 [inline]
 __se_sys_exit_group kernel/exit.c:995 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:995
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f16283cbeb9
Code: Unable to access opcode bytes at RIP 0x7f16283cbe8f.
RSP: 002b:00007ffc3267fa78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f16284357ae RCX: 00007f16283cbeb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000009 R08: 0000000000000000 R09: 00007f162843571f
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc32680d30
R13: 00007f162843571f R14: 000055558e5124e8 R15: 00007ffc32681e00
---[ end trace 296499e1e4fb347a ]---

Crashes (31):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/31 07:08 android13-5.10-lts 186f761c519d c75a2f6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/30 19:38 android13-5.10-lts 186f761c519d ae7dc18c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/29 22:58 android13-5.10-lts 186f761c519d aeb6fdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/29 21:26 android13-5.10-lts 186f761c519d aeb6fdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/29 21:21 android13-5.10-lts 186f761c519d aeb6fdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/29 09:02 android13-5.10-lts 186f761c519d 0adc945e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/28 21:39 android13-5.10-lts 186f761c519d 004c195c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/28 20:59 android13-5.10-lts 186f761c519d 004c195c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/28 16:01 android13-5.10-lts 186f761c519d 004c195c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/28 07:49 android13-5.10-lts 186f761c519d 3029c699 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/28 07:31 android13-5.10-lts 186f761c519d 3029c699 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/28 07:08 android13-5.10-lts 186f761c519d 3029c699 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/27 16:26 android13-5.10-lts da202673e11a 9a514c2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/27 16:09 android13-5.10-lts da202673e11a 9a514c2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/26 21:54 android13-5.10-lts da202673e11a a4c52dd6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/26 13:16 android13-5.10-lts 5601baec60aa a4c52dd6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/26 06:53 android13-5.10-lts 5601baec60aa 55756628 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/25 07:05 android13-5.10-lts 5601baec60aa 40acda8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/24 04:43 android13-5.10-lts 5601baec60aa 4f25b9b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/24 04:01 android13-5.10-lts 5601baec60aa 4f25b9b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/24 03:20 android13-5.10-lts 5601baec60aa 4f25b9b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/23 21:18 android13-5.10-lts 5601baec60aa e2b1b6e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/23 04:36 android13-5.10-lts 5601baec60aa 82c9c083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/22 13:59 android13-5.10-lts 5601baec60aa a16aed1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/22 13:59 android13-5.10-lts 5601baec60aa a16aed1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/22 13:59 android13-5.10-lts 5601baec60aa a16aed1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/22 13:57 android13-5.10-lts 5601baec60aa a16aed1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/22 13:56 android13-5.10-lts 5601baec60aa a16aed1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/21 11:09 android13-5.10-lts e253c52bbdfc 6f1aa2f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/19 13:12 android13-5.10-lts e253c52bbdfc a9fc5226 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
2026/01/19 00:37 android13-5.10-lts e253c52bbdfc 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in incfs_free_mount_info
* Struck through repros no longer work on HEAD.