ocfs2: Slot 0 on device (7,2) was already allocated to this node! ocfs2: Mounting device (7,2) on (node local, slot 0) with ordered data mode. ================================================================== BUG: KASAN: use-after-free in ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1391 [inline] BUG: KASAN: use-after-free in ocfs2_claim_suballoc_bits+0xfb5/0x24b0 fs/ocfs2/suballoc.c:1927 Read of size 4 at addr ffff888069bc8000 by task syz.2.3157/6412 CPU: 0 PID: 6412 Comm: syz.2.3157 Not tainted 5.15.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1391 [inline] ocfs2_claim_suballoc_bits+0xfb5/0x24b0 fs/ocfs2/suballoc.c:1927 __ocfs2_claim_clusters+0x327/0xa30 fs/ocfs2/suballoc.c:2338 ocfs2_local_alloc_new_window fs/ocfs2/localalloc.c:1170 [inline] ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1299 [inline] ocfs2_reserve_local_alloc_bits+0x1411/0x27a0 fs/ocfs2/localalloc.c:668 ocfs2_reserve_clusters_with_limit+0x1b4/0xb50 fs/ocfs2/suballoc.c:1162 ocfs2_mknod+0x1535/0x2cd0 fs/ocfs2/namei.c:354 ocfs2_mkdir+0x194/0x430 fs/ocfs2/namei.c:657 vfs_mkdir+0x3b6/0x590 fs/namei.c:4065 do_mkdirat+0x260/0x520 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fbcaffae169 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbcade17038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fbcb01c6fa0 RCX: 00007fbcaffae169 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: ffffffffffffff9c RBP: 00007fbcb002f2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fbcb01c6fa0 R15: 00007ffc9b472008 The buggy address belongs to the page: page:ffffea0001a6f200 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x100 pfn:0x69bc8 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0000c42108 ffffea0001310e08 0000000000000000 raw: 0000000000000100 0000000000000002 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x1100cca(GFP_HIGHUSER_MOVABLE), pid 30796, ts 908609926383, free_ts 911174992083 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192 __alloc_pages+0x272/0x700 mm/page_alloc.c:5466 alloc_pages_vma+0x39a/0x800 mm/mempolicy.c:2146 shmem_alloc_page mm/shmem.c:1586 [inline] shmem_alloc_and_acct_page+0x4d1/0xd10 mm/shmem.c:1611 shmem_getpage_gfp+0x17b1/0x3190 mm/shmem.c:1906 shmem_getpage mm/shmem.c:151 [inline] shmem_write_begin+0xce/0x1a0 mm/shmem.c:2474 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785 __generic_file_write_iter+0x243/0x4f0 mm/filemap.c:3912 generic_file_write_iter+0xa7/0x1b0 mm/filemap.c:3944 __kernel_write+0x5b1/0xa60 fs/read_write.c:539 __dump_emit+0x264/0x3a0 fs/coredump.c:875 dump_user_range+0x91/0x320 fs/coredump.c:949 elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285 do_coredump+0x1852/0x31e0 fs/coredump.c:826 get_signal+0xc06/0x14e0 kernel/signal.c:2886 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page_list+0x1f7/0x8e0 mm/page_alloc.c:3433 release_pages+0x1bb9/0x1f40 mm/swap.c:963 __pagevec_release+0x80/0xf0 mm/swap.c:983 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x67a/0x1b50 mm/shmem.c:964 shmem_truncate_range mm/shmem.c:1063 [inline] shmem_evict_inode+0x21b/0xa00 mm/shmem.c:1145 evict+0x529/0x930 fs/inode.c:647 __dentry_kill+0x436/0x650 fs/dcache.c:586 dentry_kill+0xbb/0x290 fs/dcache.c:-1 dput+0xd8/0x1a0 fs/dcache.c:893 __fput+0x636/0x8e0 fs/file_table.c:319 task_work_run+0x129/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x6a3/0x2480 kernel/exit.c:874 do_group_exit+0x144/0x310 kernel/exit.c:996 get_signal+0xc66/0x14e0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 Memory state around the buggy address: ffff888069bc7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888069bc7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888069bc8000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888069bc8080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888069bc8100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================