================================================================== BUG: KASAN: double-free in dbUnmount+0xf8/0x110 fs/jfs/jfs_dmap.c:271 Free of addr ffff88807d13a000 by task syz-executor.4/5039 CPU: 1 PID: 5039 Comm: syz-executor.4 Not tainted 6.4.0-syzkaller-10098-g995b406c7e97 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report_invalid_free+0xeb/0x110 mm/kasan/report.c:550 ____kasan_slab_free+0xfb/0x120 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook mm/slub.c:1818 [inline] slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0x25f/0x3b0 mm/slub.c:3814 dbUnmount+0xf8/0x110 fs/jfs/jfs_dmap.c:271 jfs_umount+0x238/0x3a0 fs/jfs/jfs_umount.c:87 jfs_put_super+0x8a/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x134/0x340 fs/super.c:499 kill_block_super+0x68/0xa0 fs/super.c:1417 deactivate_locked_super+0xa4/0x110 fs/super.c:330 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254 task_work_run+0x24a/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa3bc88d7f7 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffee2ace208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa3bc88d7f7 RDX: 00007ffee2ace2db RSI: 000000000000000a RDI: 00007ffee2ace2d0 RBP: 00007ffee2ace2d0 R08: 00000000ffffffff R09: 00007ffee2ace0a0 R10: 0000555556f38893 R11: 0000000000000246 R12: 00007fa3bc8d643b R13: 00007ffee2acf390 R14: 0000555556f38810 R15: 00007ffee2acf3d0 Allocated by task 14588: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:579 [inline] dbMount+0x58/0x980 fs/jfs/jfs_dmap.c:164 jfs_mount+0x1e5/0x830 fs/jfs/jfs_mount.c:121 jfs_fill_super+0x59c/0xc50 fs/jfs/super.c:556 mount_bdev+0x276/0x3b0 fs/super.c:1391 legacy_get_tree+0xef/0x190 fs/fs_context.c:611 vfs_get_tree+0x8c/0x270 fs/super.c:1519 do_new_mount+0x28f/0xae0 fs/namespace.c:3335 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 14609: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook mm/slub.c:1818 [inline] slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0x25f/0x3b0 mm/slub.c:3814 dbUnmount+0xf8/0x110 fs/jfs/jfs_dmap.c:271 jfs_mount_rw+0x4ac/0x6a0 fs/jfs/jfs_mount.c:247 jfs_remount+0x3d1/0x6b0 fs/jfs/super.c:454 reconfigure_super+0x43e/0x870 fs/super.c:961 vfs_fsconfig_locked fs/fsopen.c:254 [inline] __do_sys_fsconfig fs/fsopen.c:439 [inline] __se_sys_fsconfig+0xa2c/0xf70 fs/fsopen.c:314 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807d13a000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of 2048-byte region [ffff88807d13a000, ffff88807d13a800) The buggy address belongs to the physical page: page:ffffea0001f44e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d138 head:ffffea0001f44e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012842000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 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 4435, tgid 4435 (klogd), ts 16031028289, free_ts 14292536428 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x31e8/0x3370 mm/page_alloc.c:3221 __alloc_pages+0x255/0x670 mm/page_alloc.c:4477 alloc_slab_page+0x6a/0x160 mm/slub.c:1862 allocate_slab mm/slub.c:2009 [inline] new_slab+0x84/0x2f0 mm/slub.c:2062 ___slab_alloc+0xade/0x1100 mm/slub.c:3215 __slab_alloc mm/slub.c:3314 [inline] __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x1af/0x270 mm/slub.c:3509 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1076 kmalloc include/linux/slab.h:579 [inline] syslog_print+0x121/0x9b0 kernel/printk/printk.c:1553 do_syslog+0x505/0x890 kernel/printk/printk.c:1732 __do_sys_syslog kernel/printk/printk.c:1824 [inline] __se_sys_syslog kernel/printk/printk.c:1822 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1822 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2348 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2443 free_contig_range+0x9e/0x150 mm/page_alloc.c:6395 destroy_args+0x102/0x9a0 mm/debug_vm_pgtable.c:1029 debug_vm_pgtable+0x42a/0x4b0 mm/debug_vm_pgtable.c:1410 do_one_initcall+0x23d/0x7d0 init/main.c:1232 do_initcall_level+0x157/0x210 init/main.c:1294 do_initcalls+0x3f/0x80 init/main.c:1310 kernel_init_freeable+0x43b/0x5d0 init/main.c:1546 kernel_init+0x1d/0x2a0 init/main.c:1437 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88807d139f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807d139f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807d13a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d13a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d13a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================