syzbot

 sign-in | mailing list | source | docs
🐞 Open [107]
🐞 Fixed [70]
🐞 Invalid [208]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

KASAN: use-after-free Read in unaccount_page_cache_page (3)

Status: premoderation: reported on 2024/12/31 14:15
Reported-by: syzbot+29b5af9192239d0a42cc@syzkaller.appspotmail.com
First crash: 100d, last: 9d12h
▶ ▼ Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 KASAN: use-after-free Read in unaccount_page_cache_page 118 400d 875d 0/2 auto-obsoleted due to no activity on 2024/05/01 01:14
android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page 150 354d 882d 0/2 auto-obsoleted due to no activity on 2024/06/10 16:28
android-54 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page 2 435d 516d 0/2 auto-obsoleted due to no activity on 2024/04/30 10:15
android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page (2) 1 240d 240d 0/2 auto-obsoleted due to no activity on 2024/11/11 21:33
android-5-15 KASAN: use-after-free Read in unaccount_page_cache_page (2) 17 6d12h 230d 0/2 premoderation: reported on 2024/08/23 02:36
android-54 KASAN: use-after-free Read in unaccount_page_cache_page 143 666d 880d 0/2 auto-obsoleted due to no activity on 2023/08/23 09:09

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline]
BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:110 [inline]
BUG: KASAN: use-after-free in unaccount_page_cache_page+0x99f/0xa80 mm/filemap.c:175
Read of size 4 at addr ffff8881333a8470 by task syz.7.2818/11369

CPU: 0 PID: 11369 Comm: syz.7.2818 Tainted: G        W         5.10.234-syzkaller-00033-g094fc3778d6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline]
 cleancache_invalidate_page include/linux/cleancache.h:110 [inline]
 unaccount_page_cache_page+0x99f/0xa80 mm/filemap.c:175
 __delete_from_page_cache+0xd0/0x5d0 mm/filemap.c:243
 __remove_mapping+0x567/0x690 mm/vmscan.c:985
 shrink_page_list+0x1f38/0x4c60 mm/vmscan.c:1498
 shrink_inactive_list+0x591/0x1150 mm/vmscan.c:2075
 shrink_list mm/vmscan.c:2294 [inline]
 shrink_lruvec+0xced/0x3860 mm/vmscan.c:5473
 shrink_node_memcgs mm/vmscan.c:5660 [inline]
 shrink_node+0xded/0x2000 mm/vmscan.c:5690
 shrink_zones mm/vmscan.c:5896 [inline]
 do_try_to_free_pages+0x652/0x1630 mm/vmscan.c:5954
 try_to_free_mem_cgroup_pages+0x369/0x830 mm/vmscan.c:6272
 try_charge+0x4b8/0x15f0 mm/memcontrol.c:2742
 __mem_cgroup_charge+0x147/0x6e0 mm/memcontrol.c:6868
 mem_cgroup_charge include/linux/memcontrol.h:458 [inline]
 shmem_add_to_page_cache+0x6a9/0x10c0 mm/shmem.c:699
 shmem_getpage_gfp+0xa65/0x2480 mm/shmem.c:1952
 shmem_getpage mm/shmem.c:161 [inline]
 shmem_write_begin+0xca/0x1b0 mm/shmem.c:2497
 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509
 __generic_file_write_iter+0x23c/0x560 mm/filemap.c:3638
 generic_file_write_iter+0xaf/0x1c0 mm/filemap.c:3670
 __kernel_write+0x5ab/0x9d0 fs/read_write.c:550
 dump_emit+0x261/0x3a0 fs/coredump.c:849
 dump_user_range+0x71/0x1a0 fs/coredump.c:902
 elf_core_dump+0x33bd/0x3c10 fs/binfmt_elf.c:2290
 do_coredump+0x1eb8/0x2d60 fs/coredump.c:811
 get_signal+0x102c/0x1410 kernel/signal.c:2779
 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 irqentry_exit_to_user_mode+0x4e/0x80 kernel/entry/common.c:287
 irqentry_exit+0x12/0x60 kernel/entry/common.c:375
 exc_general_protection+0x415/0x490 arch/x86/kernel/traps.c:557
 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0033:0x7f410ae2f171
Code: 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00002000000001c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f410b048080 RCX: 00007f410ae2f169
RDX: 0000200000000200 RSI: 00002000000001c0 RDI: 0000000000000480
RBP: 00007f410aeb02a0 R08: 0000200000000280 R09: 0000200000000280
R10: 0000200000000240 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f410b048080 R15: 00007ffff54ba428

The buggy address belongs to the page:
page:ffffea0004ccea00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1333a8
flags: 0x4000000000000000()
raw: 4000000000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x142a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL), pid 11245, ts 388235731027, free_ts 388263842208
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 kmalloc_order+0x4c/0x170 mm/slab_common.c:843
 kmalloc_order_trace+0x18/0x90 mm/slab_common.c:859
 kmalloc_large include/linux/slab.h:481 [inline]
 __kmalloc+0x1f1/0x330 mm/slub.c:4022
 __kmalloc_node include/linux/slab.h:418 [inline]
 kmalloc_node include/linux/slab.h:575 [inline]
 alloc_htab_elem+0x269/0x710 kernel/bpf/hashtab.c:901
 htab_map_update_elem+0x2c6/0x880 kernel/bpf/hashtab.c:1030
 bpf_map_update_value+0x230/0x420 kernel/bpf/syscall.c:219
 generic_map_update_batch+0x533/0x860 kernel/bpf/syscall.c:1372
 bpf_map_do_batch+0x4c3/0x620 kernel/bpf/syscall.c:-1
 __do_sys_bpf kernel/bpf/syscall.c:-1 [inline]
 __se_sys_bpf+0xc3c/0x11cb0 kernel/bpf/syscall.c:4396
 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4396
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1629
 free_the_page+0x76/0x370 mm/page_alloc.c:5409
 __free_pages+0x67/0xc0 mm/page_alloc.c:5418
 kfree+0x1f0/0x270 mm/slub.c:4188
 htab_elem_free kernel/bpf/hashtab.c:778 [inline]
 htab_elem_free_rcu+0xb3/0xf0 kernel/bpf/hashtab.c:786
 rcu_do_batch+0x597/0xc40 kernel/rcu/tree.c:2494
 rcu_core+0x5ad/0xe40 kernel/rcu/tree.c:2735
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748
 __do_softirq+0x268/0x5bb kernel/softirq.c:309

Memory state around the buggy address:
 ffff8881333a8300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881333a8380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881333a8400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff8881333a8480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881333a8500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
syz.7.2818 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000
CPU: 0 PID: 11369 Comm: syz.7.2818 Tainted: G    B   W         5.10.234-syzkaller-00033-g094fc3778d6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 dump_stack+0x15/0x17 lib/dump_stack.c:135
 dump_header+0xd8/0x6d0 mm/oom_kill.c:502
 oom_kill_process+0xef/0x2d0 mm/oom_kill.c:1032
 out_of_memory+0x9bd/0xe10 mm/oom_kill.c:1175
 mem_cgroup_out_of_memory+0x2a8/0x380 mm/memcontrol.c:1733
 mem_cgroup_oom mm/memcontrol.c:1968 [inline]
 try_charge+0xff2/0x15f0 mm/memcontrol.c:2793
 __mem_cgroup_charge+0x147/0x6e0 mm/memcontrol.c:6868
 mem_cgroup_charge include/linux/memcontrol.h:458 [inline]
 shmem_add_to_page_cache+0x6a9/0x10c0 mm/shmem.c:699
 shmem_getpage_gfp+0xa65/0x2480 mm/shmem.c:1952
 shmem_getpage mm/shmem.c:161 [inline]
 shmem_write_begin+0xca/0x1b0 mm/shmem.c:2497
 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509
 __generic_file_write_iter+0x23c/0x560 mm/filemap.c:3638
 generic_file_write_iter+0xaf/0x1c0 mm/filemap.c:3670
 __kernel_write+0x5ab/0x9d0 fs/read_write.c:550
 dump_emit+0x261/0x3a0 fs/coredump.c:849
 dump_user_range+0x71/0x1a0 fs/coredump.c:902
 elf_core_dump+0x33bd/0x3c10 fs/binfmt_elf.c:2290
 do_coredump+0x1eb8/0x2d60 fs/coredump.c:811
 get_signal+0x102c/0x1410 kernel/signal.c:2779
 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169
 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline]
 irqentry_exit_to_user_mode+0x4e/0x80 kernel/entry/common.c:287
 irqentry_exit+0x12/0x60 kernel/entry/common.c:375
 exc_general_protection+0x415/0x490 arch/x86/kernel/traps.c:557
 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0033:0x7f410ae2f171
Code: 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00002000000001c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f410b048080 RCX: 00007f410ae2f169
RDX: 0000200000000200 RSI: 00002000000001c0 RDI: 0000000000000480
RBP: 00007f410aeb02a0 R08: 0000200000000280 R09: 0000200000000280
R10: 0000200000000240 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f410b048080 R15: 00007ffff54ba428
memory: usage 307200kB, limit 307200kB, failcnt 12880
memory+swap: usage 426136kB, limit 9007199254740988kB, failcnt 0
kmem: usage 0kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /syz7:
anon 200704
file 308047872
kernel_stack 0
percpu 0
sock 0
shmem 308047872
file_mapped 135168
file_dirty 0
file_writeback 0
anon_thp 0
inactive_anon 284381184
active_anon 30142464
inactive_file 69632
active_file 12288
unevictable 0
slab_reclaimable 0
slab_unreclaimable 0
slab 0
workingset_refault_anon 0
workingset_refault_file 0
workingset_activate_anon 0
workingset_activate_file 0
workingset_restore_anon 0
workingset_restore_file 0
oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz7,mems_allowed=0,oom_memcg=/syz7,task_memcg=/syz7,task=syz.7.2818,pid=11369,uid=0
Memory cgroup out of memory: Killed process 11369 (syz.7.2818) total-vm:89868kB, anon-rss:960kB, file-rss:49984kB, shmem-rss:0kB, UID:0 pgtables:184kB oom_score_adj:1000

Crashes (24):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/31 14:38 android13-5.10-lts 094fc3778d6b d3999433 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/03/29 11:47 android13-5.10-lts 094fc3778d6b cf25e2c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/03/25 03:23 android13-5.10-lts 094fc3778d6b 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/03/24 16:36 android13-5.10-lts 094fc3778d6b 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/03/17 04:00 android13-5.10-lts fc9aa81462ee e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/03/16 15:58 android13-5.10-lts fc9aa81462ee e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/03/12 08:44 android13-5.10-lts 3f5f2283d684 ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/03/04 12:36 android13-5.10-lts 3f5f2283d684 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/03/03 21:52 android13-5.10-lts 3f5f2283d684 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/02/13 11:22 android13-5.10-lts 6686f2996d23 b27c2402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/02/09 17:46 android13-5.10-lts 6686f2996d23 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/01/27 00:30 android13-5.10-lts fbe98d68b6b3 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/01/04 23:44 android13-5.10-lts 49e8ba0a684f f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/01/01 22:13 android13-5.10-lts 49e8ba0a684f d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2024/12/31 14:14 android13-5.10-lts 49e8ba0a684f d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: use-after-free Read in unaccount_page_cache_page
2025/04/01 09:19 android13-5.10-lts 094fc3778d6b 36d76a97 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
2025/03/31 00:35 android13-5.10-lts 094fc3778d6b d3999433 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
2025/03/13 02:18 android13-5.10-lts 3f5f2283d684 1a5d9317 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
2025/03/08 21:03 android13-5.10-lts 3f5f2283d684 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
2025/03/08 15:46 android13-5.10-lts 3f5f2283d684 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
2025/03/03 15:57 android13-5.10-lts 3f5f2283d684 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
2025/03/03 15:32 android13-5.10-lts 3f5f2283d684 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
2025/01/19 04:48 android13-5.10-lts fbe98d68b6b3 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
2025/01/04 23:21 android13-5.10-lts 49e8ba0a684f f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in unaccount_page_cache_page
* Struck through repros no longer work on HEAD.