loop0: detected capacity change from 0 to 32768 BTRFS: device fsid a6a605fc-d5f1-4e66-8595-3726e2b761d6 devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5328) BTRFS info (device loop0 state S): first mount of filesystem a6a605fc-d5f1-4e66-8595-3726e2b761d6 BTRFS info (device loop0 state S): using blake2b (blake2b-256-generic) checksum algorithm BTRFS info (device loop0 state S): using free-space-tree BTRFS info (device loop0 state CS): bdev /dev/loop0 errs: wr 0, rd 0, flush 458752, corrupt 0, gen 0 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted 6.15.0-rc2-syzkaller-00257-gb5c6891b2c5b #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:193 Code: 50 e4 b4 fd 48 83 c4 08 e8 37 17 46 08 89 c3 31 ff 89 c6 e8 5c 3d d9 fd 85 db 74 17 e8 e3 aa be fd 84 c0 74 1c e8 0a 39 d9 fd <43> 80 3c 3c 00 75 4b eb 51 e8 fc 38 d9 fd 43 80 3c 3c 00 75 3d eb RSP: 0018:ffffc9000d3f76c0 EFLAGS: 00010287 RAX: ffffffff83e981b6 RBX: 0000000000000001 RCX: 0000000000100000 RDX: ffffc9000e242000 RSI: 0000000000019a77 RDI: 0000000000019a78 RBP: ffffc9000d3f78b0 R08: ffffffff83e981a4 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003 R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000 FS: 00007f64f9fe96c0(0000) GS:ffff88808c59a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564d3e119128 CR3: 0000000042aea000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:263 btrfs_build_ref_tree+0x114/0x1710 fs/btrfs/ref-verify.c:1006 open_ctree+0x1f6a/0x2990 fs/btrfs/disk-io.c:3591 btrfs_fill_super fs/btrfs/super.c:972 [inline] btrfs_get_tree_super fs/btrfs/super.c:1897 [inline] btrfs_get_tree+0x131c/0x19e0 fs/btrfs/super.c:2092 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 fc_mount+0x1b/0xb0 fs/namespace.c:1293 btrfs_get_tree_subvol fs/btrfs/super.c:2050 [inline] btrfs_get_tree+0x68a/0x19e0 fs/btrfs/super.c:2093 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3881 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4409 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f64f918f90a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f64f9fe8e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f64f9fe8ef0 RCX: 00007f64f918f90a RDX: 0000200000000080 RSI: 0000200000000040 RDI: 00007f64f9fe8eb0 RBP: 0000200000000080 R08: 00007f64f9fe8ef0 R09: 000000000001c005 R10: 000000000001c005 R11: 0000000000000246 R12: 0000200000000040 R13: 00007f64f9fe8eb0 R14: 00000000000055ec R15: 0000200000000340 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:193 Code: 50 e4 b4 fd 48 83 c4 08 e8 37 17 46 08 89 c3 31 ff 89 c6 e8 5c 3d d9 fd 85 db 74 17 e8 e3 aa be fd 84 c0 74 1c e8 0a 39 d9 fd <43> 80 3c 3c 00 75 4b eb 51 e8 fc 38 d9 fd 43 80 3c 3c 00 75 3d eb RSP: 0018:ffffc9000d3f76c0 EFLAGS: 00010287 RAX: ffffffff83e981b6 RBX: 0000000000000001 RCX: 0000000000100000 RDX: ffffc9000e242000 RSI: 0000000000019a77 RDI: 0000000000019a78 RBP: ffffc9000d3f78b0 R08: ffffffff83e981a4 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003 R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000 FS: 00007f64f9fe96c0(0000) GS:ffff88808c59a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564d3e119128 CR3: 0000000042aea000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 50 push %rax 1: e4 b4 in $0xb4,%al 3: fd std 4: 48 83 c4 08 add $0x8,%rsp 8: e8 37 17 46 08 call 0x8461744 d: 89 c3 mov %eax,%ebx f: 31 ff xor %edi,%edi 11: 89 c6 mov %eax,%esi 13: e8 5c 3d d9 fd call 0xfdd93d74 18: 85 db test %ebx,%ebx 1a: 74 17 je 0x33 1c: e8 e3 aa be fd call 0xfdbeab04 21: 84 c0 test %al,%al 23: 74 1c je 0x41 25: e8 0a 39 d9 fd call 0xfdd93934 * 2a: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) <-- trapping instruction 2f: 75 4b jne 0x7c 31: eb 51 jmp 0x84 33: e8 fc 38 d9 fd call 0xfdd93934 38: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) 3d: 75 3d jne 0x7c 3f: eb .byte 0xeb