NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024) ================================================================== BUG: KASAN: use-after-free in nilfs_mdt_destroy+0x6f/0x80 fs/nilfs2/mdt.c:497 Read of size 8 at addr ffff88801d0e0a98 by task syz-executor229/3711 CPU: 1 PID: 3711 Comm: syz-executor229 Not tainted 6.0.0-rc6-syzkaller-00286-ga63f2e7cb110 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 nilfs_mdt_destroy+0x6f/0x80 fs/nilfs2/mdt.c:497 nilfs_free_inode+0x3e/0x60 fs/nilfs2/super.c:168 i_callback fs/inode.c:249 [inline] alloc_inode+0x13b/0x230 fs/inode.c:274 iget5_locked fs/inode.c:1242 [inline] iget5_locked+0x1cb/0x2c0 fs/inode.c:1235 nilfs_attach_btree_node_cache.part.0+0x1b3/0x3b0 fs/nilfs2/inode.c:666 nilfs_attach_btree_node_cache+0x3d/0x60 fs/nilfs2/inode.c:656 nilfs_btree_prepare_convert_and_insert fs/nilfs2/btree.c:1746 [inline] nilfs_btree_convert_and_insert+0x9a7/0x1080 fs/nilfs2/btree.c:1878 nilfs_bmap_do_insert fs/nilfs2/bmap.c:111 [inline] nilfs_bmap_insert+0x2a1/0x3f0 fs/nilfs2/bmap.c:147 nilfs_get_block+0x562/0xa50 fs/nilfs2/inode.c:101 __block_write_begin_int+0x3ca/0x1520 fs/buffer.c:2006 __block_write_begin fs/buffer.c:2056 [inline] block_write_begin+0xb5/0x4d0 fs/buffer.c:2117 nilfs_write_begin+0x9c/0x1a0 fs/nilfs2/inode.c:261 generic_perform_write+0x246/0x560 mm/filemap.c:3738 __generic_file_write_iter+0x2aa/0x4d0 mm/filemap.c:3866 generic_file_write_iter+0xdf/0x350 mm/filemap.c:3898 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x9e9/0xdd0 fs/read_write.c:578 ksys_write+0x127/0x250 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ffae1809bc9 Code: ff ff c3 66 2e 0f 1f 84 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2cd068c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007ffae1809bc9 RDX: 000000000208e24b RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00007fff2cd068f0 R08: 0000000000000002 R09: 00007fff2cd06900 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007fff2cd06930 R14: 00007fff2cd06910 R15: 0000000000000034 Allocated by task 3621: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] nilfs_mdt_init+0x2c/0x1e0 fs/nilfs2/mdt.c:451 nilfs_cpfile_read+0x11b/0x1f0 fs/nilfs2/cpfile.c:997 nilfs_load_super_root fs/nilfs2/the_nilfs.c:125 [inline] load_nilfs+0x48b/0x1330 fs/nilfs2/the_nilfs.c:269 nilfs_fill_super fs/nilfs2/super.c:1059 [inline] nilfs_mount+0xa9a/0xfb0 fs/nilfs2/super.c:1317 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801d0e0a00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 152 bytes inside of 256-byte region [ffff88801d0e0a00, ffff88801d0e0b00) The buggy address belongs to the physical page: page:ffffea0000743800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801d0e0000 pfn:0x1d0e0 head:ffffea0000743800 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000513af00 dead000000000005 ffff888011841b40 raw: ffff88801d0e0000 0000000080100003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 91, tgid 91 (kworker/u4:4), ts 6531392402, free_ts 0 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:1829 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x7f1/0xe10 mm/slub.c:3036 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123 slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3256 [inline] kmem_cache_alloc_trace+0x323/0x3e0 mm/slub.c:3287 kmalloc include/linux/slab.h:600 [inline] scsi_probe_and_add_lun+0x3ae/0x3650 drivers/scsi/scsi_scan.c:1187 __scsi_scan_target+0x21f/0xdb0 drivers/scsi/scsi_scan.c:1665 scsi_scan_channel drivers/scsi/scsi_scan.c:1753 [inline] scsi_scan_channel+0x148/0x1e0 drivers/scsi/scsi_scan.c:1729 scsi_scan_host_selected+0x2df/0x3b0 drivers/scsi/scsi_scan.c:1782 do_scsi_scan_host+0x1e8/0x260 drivers/scsi/scsi_scan.c:1921 do_scan_async+0x3e/0x500 drivers/scsi/scsi_scan.c:1931 async_run_entry_fn+0x98/0x530 kernel/async.c:127 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 page_owner free stack trace missing Memory state around the buggy address: ffff88801d0e0980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801d0e0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801d0e0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801d0e0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801d0e0b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================