BTRFS error (device loop4): open_ctree failed BTRFS info (device loop4): turning on flush-on-commit BTRFS info (device loop4): disk space caching is enabled ================================================================== BTRFS info (device loop4): has skinny extents BUG: KASAN: use-after-free in btrfs_printk+0x3e6/0x468 fs/btrfs/super.c:215 Read of size 8 at addr ffff88804f81baa0 by task syz-executor.2/8224 CPU: 1 PID: 8224 Comm: syz-executor.2 Not tainted 4.19.150-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x22c/0x33e lib/dump_stack.c:118 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256 kasan_report_error.cold+0x66/0xb9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 btrfs_printk+0x3e6/0x468 fs/btrfs/super.c:215 device_list_add+0xa10/0x1200 fs/btrfs/volumes.c:859 btrfs_scan_one_device+0x33f/0xd70 fs/btrfs/volumes.c:1272 btrfs_mount_root+0x9df/0x1830 fs/btrfs/super.c:1577 mount_fs+0xa3/0x318 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount+0x3c/0x60 fs/namespace.c:951 btrfs_mount+0x23a/0xa93 fs/btrfs/super.c:1681 mount_fs+0xa3/0x318 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x51c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4608aa Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fc5a0768a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fc5a0768b20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fc5a0768ae0 RBP: 00007fc5a0768ae0 R08: 00007fc5a0768b20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000040 Allocated by task 8175: __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node+0x4c/0x70 mm/slab.c:3696 kmalloc_node include/linux/slab.h:557 [inline] kvmalloc_node+0xb4/0xf0 mm/util.c:423 kvmalloc include/linux/mm.h:577 [inline] kvzalloc include/linux/mm.h:585 [inline] btrfs_mount_root+0x13f/0x1830 fs/btrfs/super.c:1556 mount_fs+0xa3/0x318 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount+0x3c/0x60 fs/namespace.c:951 btrfs_mount+0x23a/0xa93 fs/btrfs/super.c:1681 mount_fs+0xa3/0x318 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x51c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8175: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x250 mm/slab.c:3822 kvfree+0x59/0x60 mm/util.c:452 deactivate_locked_super+0x8c/0x100 fs/super.c:329 btrfs_mount_root+0x10a0/0x1830 fs/btrfs/super.c:1623 mount_fs+0xa3/0x318 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount+0x3c/0x60 fs/namespace.c:951 btrfs_mount+0x23a/0xa93 fs/btrfs/super.c:1681 mount_fs+0xa3/0x318 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x51c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88804f81b480 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 1568 bytes inside of 16384-byte region [ffff88804f81b480, ffff88804f81f480) The buggy address belongs to the page: page:ffffea00013e0600 count:1 mapcount:0 mapping:ffff88812c3f5200 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea0001130e08 ffffea0000eb3608 ffff88812c3f5200 raw: 0000000000000000 ffff88804f81b480 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804f81b980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804f81ba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804f81ba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804f81bb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804f81bb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================