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 (5378) 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 workqueue: max_active 32767 requested for btrfs-worker is out of range, clamping between 1 and 2048 workqueue: max_active 32767 requested for btrfs-delalloc is out of range, clamping between 1 and 2048 workqueue: max_active 32767 requested for btrfs-endio is out of range, clamping between 1 and 2048 workqueue: max_active 32767 requested for btrfs-endio-meta is out of range, clamping between 1 and 2048 workqueue: max_active 32767 requested for btrfs-rmw is out of range, clamping between 1 and 2048 workqueue: max_active 32767 requested for btrfs-endio-write is out of range, clamping between 1 and 2048 workqueue: max_active 32767 requested for btrfs-compressed-write is out of range, clamping between 1 and 2048 BTRFS critical (device loop0 state S): unable to find chunk map for logical 0 length 4096 BTRFS critical (device loop0 state S): unable to find chunk map for logical 0 length 4096 BTRFS error (device loop0 state S): failed to load root extent BTRFS info (device loop0 state CS): bdev /dev/loop0 errs: wr 0, rd 0, flush 1536, 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: 5378 Comm: syz.0.0 Not tainted syzkaller #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+0x151/0x4a0 fs/btrfs/ctree.c:193 Code: 24 e8 d3 40 00 fe c6 05 59 fc cd 0b 01 48 c7 c7 60 2b cd 8b be 4b 03 00 00 48 c7 c2 a0 2b cd 8b e8 24 0b de fd 48 8b 44 24 18 <42> 80 3c 30 00 74 08 4c 89 e7 e8 50 2d 65 fe 4d 8b 2c 24 e8 b7 41 RSP: 0018:ffffc9000d527800 EFLAGS: 00010283 RAX: 0000000000000003 RBX: ffffffff83bf7c6e RCX: 0000000000100000 RDX: ffffc9000e63a000 RSI: 000000000001cccc RDI: 000000000001cccd RBP: ffffc9000d5278c0 R08: 0000000000000000 R09: ffffffff83bf7c6e R10: dffffc0000000000 R11: ffffed100a5ce00e R12: 0000000000000018 R13: ffff88803dbe0000 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007f8f81cac6c0(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564bb44395f8 CR3: 0000000043952000 CR4: 0000000000352ef0 Call Trace: btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:263 btrfs_build_ref_tree+0x113/0x1680 fs/btrfs/ref-verify.c:988 open_ctree+0x2504/0x3a10 fs/btrfs/disk-io.c:3594 btrfs_fill_super fs/btrfs/super.c:977 [inline] btrfs_get_tree_super fs/btrfs/super.c:1940 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2077 [inline] btrfs_get_tree+0xf55/0x1820 fs/btrfs/super.c:2111 vfs_get_tree+0x92/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8f80d9038a 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:00007f8f81cabe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f8f81cabef0 RCX: 00007f8f80d9038a RDX: 0000200000000080 RSI: 0000200000000040 RDI: 00007f8f81cabeb0 RBP: 0000200000000080 R08: 00007f8f81cabef0 R09: 000000000001c005 R10: 000000000001c005 R11: 0000000000000246 R12: 0000200000000040 R13: 00007f8f81cabeb0 R14: 00000000000055c8 R15: 00002000000000c0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_node+0x151/0x4a0 fs/btrfs/ctree.c:193 Code: 24 e8 d3 40 00 fe c6 05 59 fc cd 0b 01 48 c7 c7 60 2b cd 8b be 4b 03 00 00 48 c7 c2 a0 2b cd 8b e8 24 0b de fd 48 8b 44 24 18 <42> 80 3c 30 00 74 08 4c 89 e7 e8 50 2d 65 fe 4d 8b 2c 24 e8 b7 41 RSP: 0018:ffffc9000d527800 EFLAGS: 00010283 RAX: 0000000000000003 RBX: ffffffff83bf7c6e RCX: 0000000000100000 RDX: ffffc9000e63a000 RSI: 000000000001cccc RDI: 000000000001cccd RBP: ffffc9000d5278c0 R08: 0000000000000000 R09: ffffffff83bf7c6e R10: dffffc0000000000 R11: ffffed100a5ce00e R12: 0000000000000018 R13: ffff88803dbe0000 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007f8f81cac6c0(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b9916cb2b0 CR3: 0000000043952000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 d3 40 00 fe call 0xfe0040d8 5: c6 05 59 fc cd 0b 01 movb $0x1,0xbcdfc59(%rip) # 0xbcdfc65 c: 48 c7 c7 60 2b cd 8b mov $0xffffffff8bcd2b60,%rdi 13: be 4b 03 00 00 mov $0x34b,%esi 18: 48 c7 c2 a0 2b cd 8b mov $0xffffffff8bcd2ba0,%rdx 1f: e8 24 0b de fd call 0xfdde0b48 24: 48 8b 44 24 18 mov 0x18(%rsp),%rax * 29: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 50 2d 65 fe call 0xfe652d88 38: 4d 8b 2c 24 mov (%r12),%r13 3c: e8 .byte 0xe8 3d: b7 41 mov $0x41,%bh