BTRFS info (device loop0): disabling free space tree
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
==================================================================
BUG: KASAN: slab-out-of-bounds in strlen+0x58/0x70 lib/string.c:418
Read of size 1 at addr ffff88806cc20a28 by task syz-executor.0/5480

CPU: 0 PID: 5480 Comm: syz-executor.0 Not tainted 6.7.0-syzkaller-02723-gde927f6c0b07 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __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:377 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:488
 kasan_report+0x142/0x170 mm/kasan/report.c:601
 strlen+0x58/0x70 lib/string.c:418
 getname_kernel+0x1d/0x2e0 fs/namei.c:226
 kern_path+0x1d/0x50 fs/namei.c:2608
 lookup_bdev block/bdev.c:1014 [inline]
 bdev_open_by_path+0xd1/0x400 block/bdev.c:939
 btrfs_init_dev_replace_tgtdev fs/btrfs/dev-replace.c:260 [inline]
 btrfs_dev_replace_start fs/btrfs/dev-replace.c:636 [inline]
 btrfs_dev_replace_by_ioctl+0x41b/0x2010 fs/btrfs/dev-replace.c:745
 btrfs_ioctl_dev_replace+0x2c9/0x390 fs/btrfs/ioctl.c:3308
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fa74207cba9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa742d870c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa74219bf80 RCX: 00007fa74207cba9
RDX: 0000000020000540 RSI: 00000000ca289435 RDI: 0000000000000005
RBP: 00007fa7420c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa74219bf80 R15: 00007ffe5a2c9dd8
 </TASK>

Allocated by task 5480:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x70 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:372 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3981 [inline]
 __kmalloc_node_track_caller+0x249/0x4e0 mm/slub.c:4001
 memdup_user+0x2b/0xc0 mm/util.c:197
 btrfs_ioctl_dev_replace+0xb8/0x390 fs/btrfs/ioctl.c:3295
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

The buggy address belongs to the object at ffff88806cc20000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 0 bytes to the right of
 allocated 2600-byte region [ffff88806cc20000, ffff88806cc20a28)

The buggy address belongs to the physical page:
page:ffffea0001b30800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6cc20
head:ffffea0001b30800 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888012c42140 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000040004 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5480, tgid 5478 (syz-executor.0), ts 76853265754, free_ts 51075137329
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1526
 prep_new_page mm/page_alloc.c:1533 [inline]
 get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3304
 __alloc_pages+0x255/0x680 mm/page_alloc.c:4560
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2190
 allocate_slab mm/slub.c:2354 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2407
 ___slab_alloc+0xd17/0x13d0 mm/slub.c:3540
 __slab_alloc mm/slub.c:3625 [inline]
 __slab_alloc_node mm/slub.c:3678 [inline]
 slab_alloc_node mm/slub.c:3850 [inline]
 __do_kmalloc_node mm/slub.c:3980 [inline]
 __kmalloc_node_track_caller+0x2cd/0x4e0 mm/slub.c:4001
 memdup_user+0x2b/0xc0 mm/util.c:197
 btrfs_ioctl_dev_replace+0xb8/0x390 fs/btrfs/ioctl.c:3295
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
page last free pid 5057 tgid 5057 stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1133 [inline]
 free_unref_page_prepare+0x907/0xa20 mm/page_alloc.c:2339
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2479
 vfree+0x186/0x2e0 mm/vmalloc.c:2842
 kcov_put kernel/kcov.c:429 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:525
 __fput+0x428/0x890 fs/file_table.c:381
 task_work_run+0x24a/0x300 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa2c/0x2740 kernel/exit.c:871
 do_group_exit+0x206/0x2c0 kernel/exit.c:1020
 get_signal+0x1769/0x1840 kernel/signal.c:2893
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0xc8/0x370 kernel/entry/common.c:212
 do_syscall_64+0x102/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Memory state around the buggy address:
 ffff88806cc20900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806cc20980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88806cc20a00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff88806cc20a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88806cc20b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================