KASAN: use-after-free Read in ocfs2

Date	Name	Commit	Repro	Result
2026/01/15	upstream (ToT)	603c05a1639f	C	[report] KASAN: slab-use-after-free Read in ocfs2_fault

Date

Name

Commit

Repro

Result

2026/01/15

upstream (ToT)

603c05a1639f

[report] KASAN: slab-use-after-free Read in ocfs2_fault

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	KASAN: use-after-free Read in ocfs2_fault	19				1	397d	397d	0/3	auto-obsoleted due to no activity on 2025/08/18 07:54
linux-6.1	KASAN: use-after-free Read in ocfs2_fault origin:lts-only	19	C		error	22	41d	377d	0/3	upstream: reported C repro on 2025/05/31 00:13
upstream	KASAN: slab-use-after-free Read in ocfs2_fault ocfs2	19	C	done		363	57d	637d	29/29	fixed on 2026/05/21 07:50
linux-6.6	KASAN: slab-use-after-free Read in ocfs2_fault origin:upstream missing-backport	19	C		error	3	169d	267d	0/2	upstream: reported C repro on 2025/09/17 19:37

Created	Duration	User	Repo	Result
2026/06/08 12:42	23m	retest repro	linux-5.15.y	OK log
2026/01/29 11:22	1h22m	retest repro	linux-5.15.y	report log
2026/01/29 11:02	1h37m	retest repro	linux-5.15.y	report log

Created

Duration

User

Patch

Repo

Result

2026/06/08 12:42

23m

retest repro

linux-5.15.y

OK log

2026/01/29 11:22

1h22m

retest repro

linux-5.15.y

report log

2026/01/29 11:02

1h37m

retest repro

linux-5.15.y

report log

(syz.3.321,5930,1):ocfs2_block_check_validate:402 ERROR: CRC32 failed: stored: 0xb3775c19, computed 0x2dd1c265. Applying ECC. JBD2: Ignoring recovery information on journal ocfs2: Mounting device (7,3) on (node local, slot 0) with ordered data mode. ================================================================== BUG: KASAN: use-after-free in ocfs2_fault+0xda/0x3d0 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff88802295e9e8 by task syz.3.321/5930 CPU: 0 PID: 5930 Comm: syz.3.321 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: <TASK> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 ocfs2_fault+0xda/0x3d0 fs/ocfs2/mmap.c:41 __do_fault+0x141/0x330 mm/memory.c:3928 do_read_fault mm/memory.c:4264 [inline] do_fault mm/memory.c:4392 [inline] handle_pte_fault mm/memory.c:4650 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x2985/0x4410 mm/memory.c:4883 faultin_page mm/gup.c:976 [inline] __get_user_pages+0x94b/0x11e0 mm/gup.c:1197 populate_vma_page_range+0x213/0x290 mm/gup.c:1529 __mm_populate+0x275/0x3b0 mm/gup.c:1638 mm_populate include/linux/mm.h:2646 [inline] vm_mmap_pgoff+0x212/0x2d0 mm/util.c:556 ksys_mmap_pgoff+0x54b/0x790 mm/mmap.c:1635 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: 0033:0x7fdc2abd6e59 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:00007fdc28e30028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fdc2ae4ffa0 RCX: 00007fdc2abd6e59 RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007fdc2ac6cd6f R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdc2ae50038 R14: 00007fdc2ae4ffa0 R15: 00007fffc8597bf8 </TASK> Allocated by task 5930: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3238 vm_area_alloc+0x20/0xe0 kernel/fork.c:350 __mmap_region mm/mmap.c:1782 [inline] mmap_region+0xac0/0x1650 mm/mmap.c:2933 do_mmap+0x819/0xe90 mm/mmap.c:1586 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:551 ksys_mmap_pgoff+0x54b/0x790 mm/mmap.c:1635 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 5962: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3520 remove_vma mm/mmap.c:188 [inline] remove_vma_list mm/mmap.c:2628 [inline] __do_munmap+0xc81/0xdf0 mm/mmap.c:2902 do_munmap mm/mmap.c:2910 [inline] munmap_vma_range mm/mmap.c:603 [inline] __mmap_region mm/mmap.c:1757 [inline] mmap_region+0x8b4/0x1650 mm/mmap.c:2933 do_mmap+0x819/0xe90 mm/mmap.c:1586 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:551 ksys_mmap_pgoff+0x140/0x790 mm/mmap.c:1635 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 ffff88802295e948 which belongs to the cache vm_area_struct of size 200 The buggy address is located 160 bytes inside of 200-byte region [ffff88802295e948, ffff88802295ea10) The buggy address belongs to the page: page:ffffea00008a5780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2295e memcg:ffff88801b394b01 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888140007a00 raw: 0000000000000000 00000000000f000f 00000001ffffffff ffff88801b394b01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 4037, ts 47352041379, free_ts 47350153005 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x80a/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3238 vm_area_dup+0x1e/0xb0 kernel/fork.c:358 __split_vma+0xb1/0x410 mm/mmap.c:2730 __do_munmap+0x3fe/0xdf0 mm/mmap.c:2865 do_munmap mm/mmap.c:2910 [inline] munmap_vma_range mm/mmap.c:603 [inline] __mmap_region mm/mmap.c:1757 [inline] mmap_region+0x8b4/0x1650 mm/mmap.c:2933 do_mmap+0x819/0xe90 mm/mmap.c:1586 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:551 ksys_mmap_pgoff+0x54b/0x790 mm/mmap.c:1635 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page_list+0x119/0x820 mm/page_alloc.c:3433 release_pages+0x186c/0x1be0 mm/swap.c:963 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:241 [inline] tlb_flush_mmu mm/mmu_gather.c:248 [inline] tlb_finish_mmu+0x1b4/0x370 mm/mmu_gather.c:371 exit_mmap+0x3d0/0x640 mm/mmap.c:3218 __mmput+0x115/0x3b0 kernel/fork.c:1127 exec_mmap+0x51d/0x610 fs/exec.c:1035 begin_new_exec+0x7e8/0x1160 fs/exec.c:1293 load_elf_binary+0x99c/0x28e0 fs/binfmt_elf.c:1001 search_binary_handler fs/exec.c:1742 [inline] exec_binprm fs/exec.c:1783 [inline] bprm_execve+0xaee/0x1840 fs/exec.c:1852 do_execveat_common+0x51e/0x6d0 fs/exec.c:1957 do_execve fs/exec.c:2027 [inline] __do_sys_execve fs/exec.c:2103 [inline] __se_sys_execve fs/exec.c:2098 [inline] __x64_sys_execve+0x8e/0xa0 fs/exec.c:2098 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 Memory state around the buggy address: ffff88802295e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802295e900: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb >ffff88802295e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802295ea00: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ffff88802295ea80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/05/15 03:34	linux-5.15.y	de8dfb3f0278	6ccb967e	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	KASAN: use-after-free Read in ocfs2_fault
2026/01/15 09:47	linux-5.15.y	68efe5a6c16a	d6526ea3	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)]	ci2-linux-5-15-kasan	KASAN: use-after-free Read in ocfs2_fault
2026/01/15 08:29	linux-5.15.y	68efe5a6c16a	d6526ea3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	KASAN: use-after-free Read in ocfs2_fault

Crashes (3):

Assets (help?)