KASAN: use-after-free Read in f2fs

Date	Name	Commit	Repro	Result
2024/08/04	linux-5.15.y (ToT)	7e89efd3ae1c	C	[report] KASAN: use-after-free Read in f2fs_iget
2024/05/05	upstream (ToT)	7367539ad4b0	C	[report] KASAN: slab-use-after-free Read in sanity_check_extent_cache
2024/08/04	upstream (ToT)	a5dbd76a8942	C	Didn't crash

Date

Name

Commit

Repro

Result

2024/08/04

linux-5.15.y (ToT)

7e89efd3ae1c

[report] KASAN: use-after-free Read in f2fs_iget

2024/05/05

upstream (ToT)

7367539ad4b0

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

2024/08/04

upstream (ToT)

a5dbd76a8942

Didn't crash

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-6.1	UBSAN: array-index-out-of-bounds in f2fs_iget origin:upstream	C		done	1	635d	635d	3/3	fixed on 2023/10/10 21:47
upstream	UBSAN: array-index-out-of-bounds in f2fs_iget f2fs	C	done		6	622d	667d	23/28	fixed on 2023/10/12 12:48

linux-6.1

UBSAN: array-index-out-of-bounds in f2fs_iget origin:upstream

done

635d

3/3

fixed on 2023/10/10 21:47

upstream

UBSAN: array-index-out-of-bounds in f2fs_iget f2fs

done

622d

667d

23/28

fixed on 2023/10/12 12:48

Created	Duration	User	Repo	Result
2025/03/14 05:04	10m	retest repro	linux-5.15.y	report log
2024/12/31 22:09	10m	retest repro	linux-5.15.y	report log
2024/10/14 23:49	0m	retest repro	linux-5.15.y	error

Created

Duration

User

Patch

Repo

Result

2025/03/14 05:04

10m

retest repro

linux-5.15.y

report log

2024/12/31 22:09

10m

retest repro

linux-5.15.y

report log

2024/10/14 23:49

retest repro

linux-5.15.y

error


Created	Duration	User	Repo	Result
2025/03/01 09:50	2m	fix candidate	upstream	error job log
2024/12/09 17:49	14m	fix candidate	upstream	error job log
2024/09/15 19:22	1m	fix candidate	upstream	error job log
2024/08/06 03:11	1m	fix candidate	upstream	error job log
2024/06/13 07:46	16m	bisect fix	linux-5.15.y	error job log
2024/06/12 20:08	1m	bisect fix	linux-5.15.y	error job log
2024/06/12 17:40	1m	bisect fix	linux-5.15.y	error job log
2024/06/05 19:37	10m	bisect fix	linux-5.15.y	error job log marked invalid by web-security-scanner@google.com

el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 ================================================================== BUG: KASAN: use-after-free in sanity_check_inode fs/f2fs/inode.c:275 [inline] BUG: KASAN: use-after-free in do_read_inode fs/f2fs/inode.c:415 [inline] BUG: KASAN: use-after-free in f2fs_iget+0x4188/0x5170 fs/f2fs/inode.c:514 Read of size 4 at addr ffff0000de7e5028 by task syz-executor966/4047 CPU: 1 PID: 4047 Comm: syz-executor966 Not tainted 5.15.181-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_load4_noabort+0x44/0x50 mm/kasan/report_generic.c:308 sanity_check_inode fs/f2fs/inode.c:275 [inline] do_read_inode fs/f2fs/inode.c:415 [inline] f2fs_iget+0x4188/0x5170 fs/f2fs/inode.c:514 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3102 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3116 exportfs_decode_fh_raw+0x10c/0x49c fs/exportfs/expfs.c:436 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x514/0x8e8 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 4029: 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+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x408 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x1e0/0x3e4 mm/slub.c:3233 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2625 [inline] f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2635 [inline] __grab_extent_tree fs/f2fs/extent_cache.c:295 [inline] __f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline] f2fs_init_extent_tree+0x43c/0xaac fs/f2fs/extent_cache.c:404 do_read_inode fs/f2fs/inode.c:392 [inline] f2fs_iget+0x10c4/0x5170 fs/f2fs/inode.c:514 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3102 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3116 exportfs_decode_fh_raw+0x10c/0x49c fs/exportfs/expfs.c:436 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x514/0x8e8 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 4029: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515 f2fs_destroy_extent_tree+0x2d0/0x688 fs/f2fs/extent_cache.c:845 f2fs_evict_inode+0x32c/0x1520 fs/f2fs/inode.c:769 evict+0x3c8/0x810 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 iget_failed+0x148/0x194 fs/bad_inode.c:250 f2fs_iget+0x58c/0x5170 fs/f2fs/inode.c:566 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3102 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3116 exportfs_decode_fh_raw+0x10c/0x49c fs/exportfs/expfs.c:436 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x514/0x8e8 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000de7e5000 which belongs to the cache f2fs_extent_tree of size 136 The buggy address is located 40 bytes inside of 136-byte region [ffff0000de7e5000, ffff0000de7e5088) The buggy address belongs to the page: page:000000005ed5591e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e7e5 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c6983c80 raw: 0000000000000000 0000000080140014 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000de7e4f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000de7e4f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000de7e5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000de7e5080: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb ffff0000de7e5100: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ================================================================== F2FS-fs (loop1): sanity_check_inode: inode (ino=8) extent info [5634, 0, 3] is incorrect, run fsck to fix ================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3499 [inline] BUG: KASAN: double-free or invalid-free in kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515 CPU: 1 PID: 4047 Comm: syz-executor966 Tainted: G B 5.15.181-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 kasan_report_invalid_free+0x4c/0x7c mm/kasan/report.c:373 ____kasan_slab_free+0x134/0x164 mm/kasan/common.c:-1 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515 f2fs_destroy_extent_tree+0x2d0/0x688 fs/f2fs/extent_cache.c:845 f2fs_evict_inode+0x32c/0x1520 fs/f2fs/inode.c:769 evict+0x3c8/0x810 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 iget_failed+0x148/0x194 fs/bad_inode.c:250 f2fs_iget+0x58c/0x5170 fs/f2fs/inode.c:566 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3102 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3116 exportfs_decode_fh_raw+0x10c/0x49c fs/exportfs/expfs.c:436 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x514/0x8e8 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 4029: 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+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x408 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x1e0/0x3e4 mm/slub.c:3233 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2625 [inline] f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2635 [inline] __grab_extent_tree fs/f2fs/extent_cache.c:295 [inline] __f2fs_init_extent_tree fs/f2fs/extent_cache.c:381 [inline] f2fs_init_extent_tree+0x43c/0xaac fs/f2fs/extent_cache.c:404 do_read_inode fs/f2fs/inode.c:392 [inline] f2fs_iget+0x10c4/0x5170 fs/f2fs/inode.c:514 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3102 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3116 exportfs_decode_fh_raw+0x10c/0x49c fs/exportfs/expfs.c:436 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x514/0x8e8 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 4029: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515 f2fs_destroy_extent_tree+0x2d0/0x688 fs/f2fs/extent_cache.c:845 f2fs_evict_inode+0x32c/0x1520 fs/f2fs/inode.c:769 evict+0x3c8/0x810 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 iget_failed+0x148/0x194 fs/bad_inode.c:250 f2fs_iget+0x58c/0x5170 fs/f2fs/inode.c:566 f2fs_nfs_get_inode+0x80/0x118 fs/f2fs/super.c:3102 generic_fh_to_dentry+0x9c/0x104 fs/libfs.c:1044 f2fs_fh_to_dentry+0x44/0x58 fs/f2fs/super.c:3116 exportfs_decode_fh_raw+0x10c/0x49c fs/exportfs/expfs.c:436 exportfs_decode_fh+0x50/0x80 fs/exportfs/expfs.c:576 do_handle_to_path fs/fhandle.c:152 [inline] handle_to_path fs/fhandle.c:207 [inline] do_handle_open+0x514/0x8e8 fs/fhandle.c:223 __do_sys_open_by_handle_at fs/fhandle.c:265 [inline] __se_sys_open_by_handle_at fs/fhandle.c:256 [inline] __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:256 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000de7e5000 which belongs to the cache f2fs_extent_tree of size 136 The buggy address is located 0 bytes inside of 136-byte region [ffff0000de7e5000, ffff0000de7e5088) The buggy address belongs to the page: page:000000005ed5591e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e7e5 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c6983c80 raw: 0000000000000000 0000000080140014 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000de7e4f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000de7e4f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000de7e5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000de7e5080: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb ffff0000de7e5100: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ==================================================================

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/05/03 17:45	linux-5.15.y	16fdf2c7111b	b0714e37	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)]	ci2-linux-5-15-kasan-arm64	KASAN: use-after-free Read in f2fs_iget
2024/05/05 13:43	linux-5.15.y	284087d4f7d5	610f2a54	.config	console log	report	syz	C		[disk image] [vmlinux] [kernel image] [mounted in repro]	ci2-linux-5-15-kasan-arm64	KASAN: use-after-free Read in f2fs_iget
2024/05/05 12:48	linux-5.15.y	284087d4f7d5	610f2a54	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	KASAN: use-after-free Read in f2fs_iget

Crashes (3):

Assets (help?)