loop3: detected capacity change from 0 to 262144 F2FS-fs (loop3): invalid crc value ================================================================== BUG: KASAN: slab-out-of-bounds in sanity_check_valid_blocks fs/f2fs/segment.h:385 [inline] BUG: KASAN: slab-out-of-bounds in build_sit_entries+0x1b0c/0x1f80 fs/f2fs/segment.c:5060 Read of size 4 at addr ffff88814a2f6a20 by task syz.3.250/7097 CPU: 0 UID: 0 PID: 7097 Comm: syz.3.250 Not tainted 6.15.0-rc7-next-20250523-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 sanity_check_valid_blocks fs/f2fs/segment.h:385 [inline] build_sit_entries+0x1b0c/0x1f80 fs/f2fs/segment.c:5060 f2fs_build_segment_manager+0x3112/0x49f0 fs/f2fs/segment.c:5707 f2fs_fill_super+0x45bc/0x6c80 fs/f2fs/super.c:4754 mount_bdev+0x211/0x2c0 fs/super.c:1736 legacy_get_tree+0xfd/0x1a0 fs/fs_context.c:666 vfs_get_tree+0x92/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3869 do_mount fs/namespace.c:4206 [inline] __do_sys_mount fs/namespace.c:4417 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4394 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa270d9010a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa271c53e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa271c53ef0 RCX: 00007fa270d9010a RDX: 0000200000020440 RSI: 0000200000020480 RDI: 00007fa271c53eb0 RBP: 0000200000020440 R08: 00007fa271c53ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000020480 R13: 00007fa271c53eb0 R14: 0000000000020442 R15: 0000200000000000 Allocated by task 7097: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0x30d/0x5f0 mm/slub.c:5014 f2fs_kvmalloc fs/f2fs/f2fs.h:3527 [inline] f2fs_kvzalloc fs/f2fs/f2fs.h:3533 [inline] build_sit_info fs/f2fs/segment.c:4779 [inline] f2fs_build_segment_manager+0x1485/0x49f0 fs/f2fs/segment.c:5696 f2fs_fill_super+0x45bc/0x6c80 fs/f2fs/super.c:4754 mount_bdev+0x211/0x2c0 fs/super.c:1736 legacy_get_tree+0xfd/0x1a0 fs/fs_context.c:666 vfs_get_tree+0x92/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3869 do_mount fs/namespace.c:4206 [inline] __do_sys_mount fs/namespace.c:4417 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4394 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88814a2f6000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 0 bytes to the right of allocated 2592-byte region [ffff88814a2f6000, ffff88814a2f6a20) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14a2f0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000040 ffff88801a442140 ffffea00050bce00 dead000000000002 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 057ff00000000040 ffff88801a442140 ffffea00050bce00 dead000000000002 head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 057ff00000000003 ffffea000528bc01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 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 1, tgid 1 (swapper/0), ts 21561872321, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2450 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2618 new_slab mm/slub.c:2672 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3858 __slab_alloc mm/slub.c:3948 [inline] __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] cec_allocate_adapter+0xa9/0x690 drivers/media/cec/core/cec-core.c:240 vivid_cec_alloc_adap+0xf5/0x160 drivers/media/test-drivers/vivid/vivid-cec.c:415 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:2004 [inline] vivid_probe+0x4d7c/0x7180 drivers/media/test-drivers/vivid/vivid-core.c:2095 platform_probe+0x145/0x1d0 drivers/base/platform.c:1404 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26d/0x9a0 drivers/base/dd.c:657 __driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799 driver_probe_device+0x4f/0x430 drivers/base/dd.c:829 __driver_attach+0x452/0x700 drivers/base/dd.c:1215 bus_for_each_dev+0x233/0x2b0 drivers/base/bus.c:370 page_owner free stack trace missing Memory state around the buggy address: ffff88814a2f6900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88814a2f6980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88814a2f6a00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88814a2f6a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88814a2f6b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================