KASAN: slab-out-of-bounds Read in drop

Kernel	Title	Rank 🛈	Repro	Cause bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: null-ptr-deref Read in drop_buffers (2) jfs	11	C	error	252	563d	774d	0/29	auto-obsoleted due to no activity on 2024/05/08 22:28
upstream	KASAN: null-ptr-deref Read in drop_buffers kernfs	11			5	1050d	1050d	0/29	auto-obsoleted due to no activity on 2023/02/27 02:04
upstream	KASAN: null-ptr-deref Read in drop_buffers (4) fs	17			228	18d	26d	0/29	moderation: reported on 2025/08/18 04:14
upstream	KASAN: null-ptr-deref Read in drop_buffers (3) fs	17	C		98	181d	347d	0/29	auto-obsoleted due to no activity on 2025/06/08 23:43

================================================================== BUG: KASAN: slab-out-of-bounds in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: slab-out-of-bounds in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: slab-out-of-bounds in buffer_busy fs/buffer.c:2784 [inline] BUG: KASAN: slab-out-of-bounds in drop_buffers+0x6f/0x700 fs/buffer.c:2796 Read of size 4 at addr ffff88807e5e0660 by task syz.1.2988/20660 CPU: 0 PID: 20660 Comm: syz.1.2988 Not tainted 6.1.127-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:427 kasan_report+0x136/0x160 mm/kasan/report.c:531 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] buffer_busy fs/buffer.c:2784 [inline] drop_buffers+0x6f/0x700 fs/buffer.c:2796 try_to_free_buffers+0x295/0x600 fs/buffer.c:2826 shrink_folio_list+0x288c/0x8f40 mm/vmscan.c:2003 evict_folios+0xaf8/0x25b0 mm/vmscan.c:5046 lru_gen_shrink_lruvec mm/vmscan.c:5229 [inline] shrink_lruvec+0xdbf/0x4650 mm/vmscan.c:5924 </TASK> Allocated by task 13123: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xb2/0x230 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] iomap_page_create+0x151/0x610 fs/iomap/buffered-io.c:61 iomap_readpage_iter+0x332/0xb90 fs/iomap/buffered-io.c:273 iomap_read_folio+0x3d2/0xa10 fs/iomap/buffered-io.c:344 filemap_read_folio+0x199/0x780 mm/filemap.c:2489 do_read_cache_folio+0x2ee/0x810 mm/filemap.c:3626 erofs_bread+0x19d/0x6b0 fs/erofs/data.c:50 erofs_find_target_block fs/erofs/namei.c:102 [inline] erofs_namei+0x278/0xef0 fs/erofs/namei.c:175 erofs_lookup+0x1d6/0x4d0 fs/erofs/namei.c:204 __lookup_slow+0x27e/0x3d0 fs/namei.c:1690 lookup_slow+0x53/0x70 fs/namei.c:1707 walk_component+0x2d0/0x400 fs/namei.c:1998 lookup_last fs/namei.c:2455 [inline] path_lookupat+0x16f/0x450 fs/namei.c:2479 filename_lookup+0x251/0x600 fs/namei.c:2508 user_path_at_empty+0x3e/0x60 fs/namei.c:2905 user_path_at include/linux/namei.h:57 [inline] do_mount fs/namespace.c:3396 [inline] __do_sys_mount fs/namespace.c:3607 [inline] __se_sys_mount+0x296/0x3c0 fs/namespace.c:3584 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 kvfree_call_rcu+0x116/0x8c0 kernel/rcu/tree.c:3401 cfg80211_update_known_bss+0x16b/0x9e0 cfg80211_bss_update+0x187/0x2280 net/wireless/scan.c:1817 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2476 [inline] cfg80211_inform_bss_frame_data+0xae4/0x1680 net/wireless/scan.c:2509 ieee80211_bss_info_update+0x847/0xf00 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x1962/0x2dd0 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1668 [inline] ieee80211_iface_work+0x7aa/0xce0 net/mac80211/iface.c:1722 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 kvfree_call_rcu+0x116/0x8c0 kernel/rcu/tree.c:3401 cfg80211_update_known_bss+0x16b/0x9e0 cfg80211_bss_update+0x187/0x2280 net/wireless/scan.c:1817 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2476 [inline] cfg80211_inform_bss_frame_data+0xae4/0x1680 net/wireless/scan.c:2509 ieee80211_bss_info_update+0x847/0xf00 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x1962/0x2dd0 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1668 [inline] ieee80211_iface_work+0x7aa/0xce0 net/mac80211/iface.c:1722 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88807e5e0600 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes to the right of 96-byte region [ffff88807e5e0600, ffff88807e5e0660) The buggy address belongs to the physical page: page:ffffea0001f97800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807e5e0200 pfn:0x7e5e0 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001f82ec8 ffffea0000a5b548 ffff888017c41780 raw: ffff88807e5e0200 0000000000200019 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 3604, tgid 3604 (S01syslogd), ts 24285483800, free_ts 22684759500 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x3731/0x38d0 mm/page_alloc.c:4328 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5605 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa1/0x230 mm/slab_common.c:949 kmalloc_array include/linux/slab.h:615 [inline] kcalloc include/linux/slab.h:646 [inline] ext4_find_extent+0x378/0xe20 fs/ext4/extents.c:914 ext4_ext_map_blocks+0x309/0x7ab0 fs/ext4/extents.c:4165 ext4_map_blocks+0x401/0x1cb0 fs/ext4/inode.c:605 ext4_mpage_readpages+0xb82/0x2eb0 fs/ext4/readpage.c:305 read_pages+0x17f/0x830 mm/readahead.c:161 page_cache_ra_unbounded+0x68b/0x7b0 mm/readahead.c:270 page_cache_sync_readahead include/linux/pagemap.h:1248 [inline] filemap_get_pages mm/filemap.c:2664 [inline] filemap_read+0x7fa/0x31d0 mm/filemap.c:2758 __kernel_read+0x421/0x890 fs/read_write.c:428 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3479 kasan_depopulate_vmalloc_pte+0x66/0x80 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2662 [inline] apply_to_pmd_range mm/memory.c:2706 [inline] apply_to_pud_range mm/memory.c:2742 [inline] apply_to_p4d_range mm/memory.c:2778 [inline] __apply_to_page_range+0x9c5/0xcc0 mm/memory.c:2812 kasan_release_vmalloc+0x96/0xb0 mm/kasan/shadow.c:492 __purge_vmap_area_lazy+0x157c/0x1720 mm/vmalloc.c:1774 _vm_unmap_aliases+0x476/0x4e0 mm/vmalloc.c:2177 change_page_attr_set_clr+0x304/0xe70 arch/x86/mm/pat/set_memory.c:1821 change_page_attr_set arch/x86/mm/pat/set_memory.c:1871 [inline] set_memory_nx+0xee/0x130 arch/x86/mm/pat/set_memory.c:2064 free_init_pages arch/x86/mm/init.c:933 [inline] free_kernel_image_pages arch/x86/mm/init.c:952 [inline] free_initmem+0x71/0xc0 arch/x86/mm/init.c:979 kernel_init+0x2d/0x290 init/main.c:1523 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88807e5e0500: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88807e5e0580: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff88807e5e0600: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff88807e5e0680: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88807e5e0700: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/01/31 23:02	linux-6.1.y	75cefdf153f5	aa47157c	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan	KASAN: slab-out-of-bounds Read in drop_buffers

Crashes (1):

Assets (help?)