loop0: detected capacity change from 0 to 32768 BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5322) BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf BTRFS info (device loop0): using crc32c checksum algorithm BTRFS info (device loop0): enabling ssd optimizations BTRFS info (device loop0): turning on async discard BTRFS info (device loop0): enabling free space tree BTRFS info (device loop0): balance: start -s BTRFS info (device loop0): left=0, need=98304, flags=2 BTRFS info (device loop0): space_info SYSTEM (sub-group id 0) has 0 free, is not full BTRFS info (device loop0): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=0, readonly=4190208 zone_unusable=0 BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1441792 BTRFS info (device loop0): trans_block_rsv: size 0 reserved 0 BTRFS info (device loop0): chunk_block_rsv: size 0 reserved 0 BTRFS info (device loop0): remap_block_rsv: size 0 reserved 0 BTRFS info (device loop0): delayed_block_rsv: size 0 reserved 0 BTRFS info (device loop0): delayed_refs_rsv: size 0 reserved 0 BTRFS info (device loop0): relocating block group 1048576 flags system BTRFS info (device loop0): left=0, need=98304, flags=2 BTRFS info (device loop0): space_info SYSTEM (sub-group id 0) has 0 free, is not full BTRFS info (device loop0): space_info total=12451840, used=4096, pinned=0, reserved=8253440, may_use=0, readonly=4194304 zone_unusable=0 BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1437696 BTRFS info (device loop0): trans_block_rsv: size 262144 reserved 262144 BTRFS info (device loop0): chunk_block_rsv: size 0 reserved 0 BTRFS info (device loop0): remap_block_rsv: size 0 reserved 0 BTRFS info (device loop0): delayed_block_rsv: size 0 reserved 0 BTRFS info (device loop0): delayed_refs_rsv: size 524288 reserved 524288 BTRFS error (device loop0): allocation failed flags 2, wanted 4096 tree-log 0, relocation: 0 BTRFS info (device loop0): space_info SYSTEM (sub-group id 0) has -4096 free, is not full BTRFS info (device loop0): space_info total=12451840, used=4096, pinned=0, reserved=8253440, may_use=4096, readonly=4194304 zone_unusable=0 BTRFS info (device loop0): global_block_rsv: size 1441792 reserved 1437696 BTRFS info (device loop0): trans_block_rsv: size 262144 reserved 262144 BTRFS info (device loop0): chunk_block_rsv: size 0 reserved 0 BTRFS info (device loop0): remap_block_rsv: size 0 reserved 0 BTRFS info (device loop0): delayed_block_rsv: size 0 reserved 0 BTRFS info (device loop0): delayed_refs_rsv: size 524288 reserved 524288 BTRFS info (device loop0): block group 1048576 has 4194304 bytes, 0 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (4194304 bytes available) [readonly] BTRFS critical (device loop0): entry offset 1048576, bytes 4194304, bitmap no BTRFS info (device loop0): block group has cluster?: no BTRFS info (device loop0): 0 free space entries at or bigger than 4096 bytes BTRFS info (device loop0): block group 8519680 has 8257536 bytes, 4096 used 0 pinned 8253440 reserved 0 delalloc 0 super 0 zone_unusable (0 bytes available) BTRFS info (device loop0): block group has cluster?: no BTRFS info (device loop0): 0 free space entries at or bigger than 4096 bytes BTRFS info (device loop0): 4194304 bytes available across all block groups ------------[ cut here ]------------ BTRFS: Transaction aborted (error -28) WARNING: fs/btrfs/volumes.c:3470 at btrfs_remove_chunk+0xe0d/0x15f0 fs/btrfs/volumes.c:3470, CPU#0: syz.0.0/5322 Modules linked in: CPU: 0 UID: 0 PID: 5322 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 04/01/2014 RIP: 0010:btrfs_remove_chunk+0xe10/0x15f0 fs/btrfs/volumes.c:3470 Code: 06 ce fd e9 ee 00 00 00 e8 7d 0a b3 fd 84 c0 74 23 e8 b4 06 ce fd e9 db 00 00 00 e8 aa 06 ce fd 48 8d 3d 33 69 23 0c 44 89 ee <67> 48 0f b9 3a e9 02 01 00 00 e8 11 9f b8 07 89 c3 31 ff 89 c6 e8 RSP: 0018:ffffc9000e147940 EFLAGS: 00010283 RAX: ffffffff83f7a8d6 RBX: ffff8880427d0001 RCX: 0000000000100000 RDX: ffffc9000ec4a000 RSI: 00000000ffffffe4 RDI: ffffffff901b1210 RBP: ffffc9000e147a90 R08: ffff8880353124c0 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000002 R12: ffff88801180e4a0 R13: ffffffffffffffe4 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f41954866c0(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8e2e836890 CR3: 000000001f8a8000 CR4: 0000000000352ef0 Call Trace: btrfs_relocate_chunk_finish fs/btrfs/volumes.c:3557 [inline] btrfs_relocate_chunk+0x3e7/0x810 fs/btrfs/volumes.c:3611 __btrfs_balance+0x1dab/0x2ae0 fs/btrfs/volumes.c:4492 btrfs_balance+0xafa/0x11f0 fs/btrfs/volumes.c:4879 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3452 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f419459c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4195485fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4194815fa0 RCX: 00007f419459c799 RDX: 0000200000000200 RSI: 00000000c4009420 RDI: 0000000000000004 RBP: 00007f4194632c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4194816038 R14: 00007f4194815fa0 R15: 00007fff17c8d008 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: fd std 1: e9 ee 00 00 00 jmp 0xf4 6: e8 7d 0a b3 fd call 0xfdb30a88 b: 84 c0 test %al,%al d: 74 23 je 0x32 f: e8 b4 06 ce fd call 0xfdce06c8 14: e9 db 00 00 00 jmp 0xf4 19: e8 aa 06 ce fd call 0xfdce06c8 1e: 48 8d 3d 33 69 23 0c lea 0xc236933(%rip),%rdi # 0xc236958 25: 44 89 ee mov %r13d,%esi * 28: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2d: e9 02 01 00 00 jmp 0x134 32: e8 11 9f b8 07 call 0x7b89f48 37: 89 c3 mov %eax,%ebx 39: 31 ff xor %edi,%edi 3b: 89 c6 mov %eax,%esi 3d: e8 .byte 0xe8