syzbot


KASAN: use-after-free Write in igrab

Status: upstream: reported C repro on 2023/12/23 18:24
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+2d747cdee917b5e40432@syzkaller.appspotmail.com
First crash: 207d, last: 39d
Bug presence (3)
Date Name Commit Repro Result
2023/12/23 android13-5.15-lts (ToT) 28e3f5851a99 C [report] KASAN: use-after-free Write in igrab
2023/12/23 lts (merge base) 9b91d36ba301 C Didn't crash
2023/12/23 upstream (ToT) 5254c0cbc92d C Didn't crash
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 KASAN: use-after-free Write in igrab origin:upstream missing-backport C done unreliable 29 247d 407d 0/2 auto-obsoleted due to no activity on 2024/02/03 11:30
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/05/10 03:26 8m retest repro android13-5.15-lts report log
2024/04/26 02:23 18m retest repro android13-5.15-lts report log
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/06/09 12:25 1h07m bisect fix android13-5.15-lts OK (0) job log log
2024/02/27 05:32 42m bisect fix android13-5.15-lts OK (0) job log log
2024/01/23 11:33 44m bisect fix android13-5.15-lts OK (0) job log log

Sample crash report:
R10: 000000000001058e R11: 0000000000000246 R12: 00007f39873752d0
R13: 0000000000000000 R14: 00007f3987376040 R15: 00007f39872b7cf0
 </TASK>
---[ end trace b6ddc87460bb2399 ]---
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:511 [inline]
BUG: KASAN: use-after-free in queued_spin_lock include/asm-generic/qspinlock.h:82 [inline]
BUG: KASAN: use-after-free in do_raw_spin_lock include/linux/spinlock.h:187 [inline]
BUG: KASAN: use-after-free in __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
BUG: KASAN: use-after-free in _raw_spin_lock+0x97/0x1b0 kernel/locking/spinlock.c:154
Write of size 4 at addr ffff88810934e188 by task syz-executor395/292

CPU: 0 PID: 292 Comm: syz-executor395 Tainted: G        W         5.15.148-syzkaller-00718-g993bed180178 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:511 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:82 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0x97/0x1b0 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:363 [inline]
 igrab+0x20/0xa0 fs/inode.c:1346
 f2fs_sync_inode_meta+0x14d/0x2a0 fs/f2fs/checkpoint.c:1157
 block_operations fs/f2fs/checkpoint.c:1265 [inline]
 f2fs_write_checkpoint+0xab4/0x1fb0 fs/f2fs/checkpoint.c:1659
 f2fs_issue_checkpoint+0x31b/0x4d0
 f2fs_sync_fs+0x186/0x2f0 fs/f2fs/super.c:1695
 sync_filesystem+0x1cf/0x250 fs/sync.c:66
 f2fs_quota_off_umount+0x20e/0x220 fs/f2fs/super.c:2896
 f2fs_put_super+0xb9/0xc10 fs/f2fs/super.c:1582
 generic_shutdown_super+0x157/0x2e0 fs/super.c:475
 kill_block_super+0x7e/0xe0 fs/super.c:1414
 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4610
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150
 task_work_run+0x129/0x190 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:878
 do_group_exit+0x141/0x310 kernel/exit.c:1000
 __do_sys_exit_group kernel/exit.c:1011 [inline]
 __se_sys_exit_group kernel/exit.c:1009 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1009
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f39872e97c9
Code: Unable to access opcode bytes at RIP 0x7f39872e979f.
RSP: 002b:00007ffcdf096c18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f39872e97c9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f39873752d0 R08: ffffffffffffffb8 R09: 00007ffcdf096cf0
R10: 000000000001058e R11: 0000000000000246 R12: 00007f39873752d0
R13: 0000000000000000 R14: 00007f3987376040 R15: 00007f39872b7cf0
 </TASK>

Allocated by task 292:
 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:433 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2795 [inline]
 f2fs_alloc_inode+0x26/0x340 fs/f2fs/super.c:1406
 alloc_inode fs/inode.c:236 [inline]
 iget_locked+0x174/0x860 fs/inode.c:1244
 f2fs_iget+0x55/0x4de0 fs/f2fs/inode.c:489
 f2fs_lookup+0x410/0xd80 fs/f2fs/namei.c:551
 lookup_open fs/namei.c:3446 [inline]
 open_last_lookups fs/namei.c:3538 [inline]
 path_openat+0x1194/0x2f40 fs/namei.c:3745
 do_filp_open+0x21c/0x460 fs/namei.c:3775
 do_sys_openat2+0x13f/0x830 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_openat fs/open.c:1266 [inline]
 __se_sys_openat fs/open.c:1261 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1261
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 292:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3519 [inline]
 kmem_cache_free+0x116/0x2e0 mm/slub.c:3535
 f2fs_free_inode+0x24/0x30 fs/f2fs/super.c:1550
 i_callback+0x4b/0x70 fs/inode.c:225
 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2523
 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2763
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776
 __do_softirq+0x26d/0x5bf kernel/softirq.c:565

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3087
 destroy_inode fs/inode.c:291 [inline]
 evict+0x5df/0x630 fs/inode.c:602
 dispose_list fs/inode.c:620 [inline]
 evict_inodes+0x5db/0x660 fs/inode.c:670
 generic_shutdown_super+0x9c/0x2e0 fs/super.c:454
 kill_block_super+0x7e/0xe0 fs/super.c:1414
 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4610
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150
 task_work_run+0x129/0x190 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xc48/0x2ca0 kernel/exit.c:878
 do_group_exit+0x141/0x310 kernel/exit.c:1000
 __do_sys_exit_group kernel/exit.c:1011 [inline]
 __se_sys_exit_group kernel/exit.c:1009 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1009
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88810934e100
 which belongs to the cache f2fs_inode_cache of size 1424
The buggy address is located 136 bytes inside of
 1424-byte region [ffff88810934e100, ffff88810934e690)
The buggy address belongs to the page:
page:ffffea000424d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109348
head:ffffea000424d200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 ffff888104bb0d80
raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 292, ts 19527450266, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2604
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2610
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4484
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5776
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3248 [inline]
 kmem_cache_alloc+0x134/0x200 mm/slub.c:3253
 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2795 [inline]
 f2fs_alloc_inode+0x26/0x340 fs/f2fs/super.c:1406
 alloc_inode fs/inode.c:236 [inline]
 iget_locked+0x174/0x860 fs/inode.c:1244
 f2fs_iget+0x55/0x4de0 fs/f2fs/inode.c:489
 f2fs_lookup+0x410/0xd80 fs/f2fs/namei.c:551
 lookup_open fs/namei.c:3446 [inline]
 open_last_lookups fs/namei.c:3538 [inline]
 path_openat+0x1194/0x2f40 fs/namei.c:3745
 do_filp_open+0x21c/0x460 fs/namei.c:3775
 do_sys_openat2+0x13f/0x830 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_openat fs/open.c:1266 [inline]
 __se_sys_openat fs/open.c:1261 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1261
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810934e080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810934e100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810934e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff88810934e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810934e280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (31):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/11 03:20 android13-5.15-lts 993bed180178 33b9e058 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 KASAN: use-after-free Write in igrab
2023/12/23 18:20 android13-5.15-lts 28e3f5851a99 fb427a07 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/12 02:06 android13-5.15-lts 993bed180178 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/12 02:06 android13-5.15-lts 993bed180178 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/12 02:06 android13-5.15-lts 993bed180178 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/12 02:06 android13-5.15-lts 993bed180178 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/12 02:02 android13-5.15-lts 993bed180178 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/12 02:02 android13-5.15-lts 993bed180178 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/12 02:02 android13-5.15-lts 993bed180178 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/12 01:28 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 20:24 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 20:24 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 20:24 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 20:24 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 20:24 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 14:34 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 13:46 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 13:46 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 13:46 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 13:46 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 13:46 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 02:59 android13-5.15-lts 993bed180178 33b9e058 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 02:59 android13-5.15-lts 993bed180178 33b9e058 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/03/29 04:11 android13-5.15-lts 993bed180178 e91187ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/03/29 04:11 android13-5.15-lts 993bed180178 e91187ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/03/29 00:04 android13-5.15-lts 993bed180178 e91187ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/03/28 01:50 android13-5.15-lts 993bed180178 120789fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/03/28 01:50 android13-5.15-lts 993bed180178 120789fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2023/12/23 19:25 android13-5.15-lts 28e3f5851a99 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2023/12/23 18:05 android13-5.15-lts 28e3f5851a99 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Write in igrab
2024/04/11 20:24 android13-5.15-lts 993bed180178 95ed9ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: use-after-free Read in igrab
* Struck through repros no longer work on HEAD.