BTRFS warning (device loop0): couldn't read tree root assertion failed: !tmp, in fs/btrfs/disk-io.c:1002 ------------[ cut here ]------------ kernel BUG at fs/btrfs/messages.c:259! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 2 PID: 22510 Comm: syz-executor.0 Not tainted 6.3.0-rc7-syzkaller-00089-gcb0856346a60 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:btrfs_assertfail+0x2c/0x30 fs/btrfs/messages.c:259 Code: 1f 00 41 55 41 89 d5 41 54 49 89 f4 55 48 89 fd e8 e9 67 f8 fd 44 89 e9 4c 89 e2 48 89 ee 48 c7 c7 00 27 97 8a e8 34 63 dc fd <0f> 0b 66 90 66 0f 1f 00 55 48 89 fd e8 c3 67 f8 fd 48 89 ef 5d 48 RSP: 0018:ffffc90003437658 EFLAGS: 00010282 RAX: 0000000000000032 RBX: 0000000000000000 RCX: ffffc90007812000 RDX: 0000000000000000 RSI: ffffffff81677efc RDI: 0000000000000005 RBP: ffffffff8a946fe0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff8a946020 R13: 00000000000003ea R14: dffffc0000000000 R15: ffff88806f874060 FS: 0000000000000000(0000) GS:ffff88802c800000(0063) knlGS:00000000f7f84b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000ee9fe000 CR3: 0000000070212000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> btrfs_global_root_insert+0x1fd/0x260 fs/btrfs/disk-io.c:1002 load_global_roots_objectid+0x12e/0x7e0 fs/btrfs/disk-io.c:2385 load_global_roots fs/btrfs/disk-io.c:2419 [inline] btrfs_read_roots fs/btrfs/disk-io.c:2446 [inline] init_tree_roots fs/btrfs/disk-io.c:2869 [inline] open_ctree+0x22bb/0x5410 fs/btrfs/disk-io.c:3565 btrfs_fill_super fs/btrfs/super.c:1152 [inline] btrfs_mount_root+0xa0c/0xd30 fs/btrfs/super.c:1519 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 fc_mount fs/namespace.c:1035 [inline] vfs_kern_mount.part.0+0xd3/0x170 fs/namespace.c:1065 vfs_kern_mount+0x40/0x60 fs/namespace.c:1052 btrfs_mount+0x23f/0xb20 fs/btrfs/super.c:1579 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3571 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f89579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f84410 EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f7f84480 RCX: 0000000020000000 RDX: 0000000020005100 RSI: 0000000000000080 RDI: 00000000f7f844c0 RBP: 00000000f7f844c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_assertfail+0x2c/0x30 fs/btrfs/messages.c:259 Code: 1f 00 41 55 41 89 d5 41 54 49 89 f4 55 48 89 fd e8 e9 67 f8 fd 44 89 e9 4c 89 e2 48 89 ee 48 c7 c7 00 27 97 8a e8 34 63 dc fd <0f> 0b 66 90 66 0f 1f 00 55 48 89 fd e8 c3 67 f8 fd 48 89 ef 5d 48 RSP: 0018:ffffc90003437658 EFLAGS: 00010282 RAX: 0000000000000032 RBX: 0000000000000000 RCX: ffffc90007812000 RDX: 0000000000000000 RSI: ffffffff81677efc RDI: 0000000000000005 RBP: ffffffff8a946fe0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff8a946020 R13: 00000000000003ea R14: dffffc0000000000 R15: ffff88806f874060 FS: 0000000000000000(0000) GS:ffff88802c800000(0063) knlGS:00000000f7f84b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000ede39000 CR3: 0000000070212000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 retq 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi