BTRFS info (device loop0): clearing 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)
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BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:577 [inline]
BUG: KASAN: null-ptr-deref in btrfs_root_node+0xf6/0x350 fs/btrfs/ctree.c:140
Write of size 4 at addr 0000000000000060 by task syz-executor.0/4569

CPU: 0 PID: 4569 Comm: syz-executor.0 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:438 [inline]
 kasan_report+0xd5/0x130 mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:577 [inline]
 btrfs_root_node+0xf6/0x350 fs/btrfs/ctree.c:140
 btrfs_read_lock_root_node+0x75/0x390 fs/btrfs/locking.c:276
 btrfs_search_slot_get_root fs/btrfs/ctree.c:1654 [inline]
 btrfs_search_slot+0x4b5/0x20a0 fs/btrfs/ctree.c:1818
 btrfs_orphan_cleanup+0x1a2/0x910 fs/btrfs/inode.c:3541
 btrfs_cleanup_fs_roots+0x61c/0x950 fs/btrfs/disk-io.c:4305
 btrfs_start_pre_rw_mount+0x18b/0x630 fs/btrfs/disk-io.c:3102
 open_ctree+0x2878/0x3250 fs/btrfs/disk-io.c:3634
 btrfs_fill_super+0x1c2/0x2e0 fs/btrfs/super.c:1387
 btrfs_mount_root+0x857/0x8c0 fs/btrfs/super.c:1751
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 fc_mount fs/namespace.c:1000 [inline]
 vfs_kern_mount+0xba/0x150 fs/namespace.c:1030
 btrfs_mount+0x2d7/0xa50 fs/btrfs/super.c:1811
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3013
 do_mount fs/namespace.c:3356 [inline]
 __do_sys_mount fs/namespace.c:3564 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3541
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd90d33e42a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd90c6bdee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd90c6bdf80 RCX: 00007fd90d33e42a
RDX: 00000000200055c0 RSI: 0000000020000080 RDI: 00007fd90c6bdf40
RBP: 00000000200055c0 R08: 00007fd90c6bdf80 R09: 0000000000000008
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000020000080
R13: 00007fd90c6bdf40 R14: 00000000000055ab R15: 0000000020000000
 </TASK>
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