RBP: 00007f0a9225006b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000002000402 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0a92441218 R14: 00007f0a92441180 R15: 00007fff09d3d698 ---[ end trace 3ccde4186f695f03 ]--- ================================================================== BUG: KASAN: slab-out-of-bounds in __set_sit_entry_type fs/f2fs/segment.c:2257 [inline] BUG: KASAN: slab-out-of-bounds in reset_curseg+0x508/0x590 fs/f2fs/segment.c:2663 Read of size 4 at addr ffff888112a513c0 by task syz.5.138/975 CPU: 0 PID: 975 Comm: syz.5.138 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x100/0x140 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 __set_sit_entry_type fs/f2fs/segment.c:2257 [inline] reset_curseg+0x508/0x590 fs/f2fs/segment.c:2663 new_curseg+0x12ea/0x18d0 fs/f2fs/segment.c:2723 __allocate_new_segment+0x13d/0x810 fs/f2fs/segment.c:3039 __allocate_new_section fs/f2fs/segment.c:3047 [inline] f2fs_allocate_new_section+0x1f3/0x290 fs/f2fs/segment.c:3054 expand_inode_data+0x69a/0xa70 fs/f2fs/file.c:1768 f2fs_fallocate+0x3dd/0x750 fs/f2fs/file.c:1873 vfs_fallocate+0x4b9/0x590 fs/open.c:310 ksys_fallocate fs/open.c:333 [inline] __do_sys_fallocate fs/open.c:341 [inline] __se_sys_fallocate fs/open.c:339 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:339 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f0a921b9159 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:00007f0a90bd0028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f0a92441180 RCX: 00007f0a921b9159 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 00007f0a9225006b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000002000402 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0a92441218 R14: 00007f0a92441180 R15: 00007fff09d3d698 Allocated by task 964: 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:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x19f/0x330 mm/slub.c:4038 __kmalloc_node include/linux/slab.h:421 [inline] kmalloc_node include/linux/slab.h:578 [inline] kvmalloc_node+0x88/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:833 [inline] f2fs_kvmalloc fs/f2fs/f2fs.h:3372 [inline] f2fs_kvzalloc fs/f2fs/f2fs.h:3378 [inline] build_sit_info fs/f2fs/segment.c:4395 [inline] f2fs_build_segment_manager+0xdb6/0x48c0 fs/f2fs/segment.c:5257 f2fs_fill_super+0x4a08/0x73d0 fs/f2fs/super.c:4317 mount_bdev+0x26a/0x380 fs/super.c:1453 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4598 legacy_get_tree+0xed/0x190 fs/fs_context.c:593 vfs_get_tree+0x89/0x260 fs/super.c:1583 do_new_mount+0x25a/0xa30 fs/namespace.c:3006 path_mount+0x581/0xca0 fs/namespace.c:3336 do_mount fs/namespace.c:3349 [inline] __do_sys_mount fs/namespace.c:3557 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3534 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888112a51000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 960 bytes inside of 1024-byte region [ffff888112a51000, ffff888112a51400) The buggy address belongs to the page: page:ffffea00044a9400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112a50 head:ffffea00044a9400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 106, ts 4101787842, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1e4/0x310 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast+0x335/0x5a0 lib/kobject_uevent.c:409 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608 kobject_synth_uevent+0x452/0x940 lib/kobject_uevent.c:208 uevent_store+0x25/0x60 drivers/base/core.c:2320 dev_attr_store+0x5e/0x80 drivers/base/core.c:2018 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:143 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296 page_owner free stack trace missing Memory state around the buggy address: ffff888112a51280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888112a51300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888112a51380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888112a51400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888112a51480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================