loop0: detected capacity change from 0 to 32768 btrfs: Deprecated parameter 'usebackuproot' BTRFS warning: 'usebackuproot' is deprecated, use 'rescue=usebackuproot' instead BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5346) BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf BTRFS info (device loop0): using crc32c (crc32c-lib) checksum algorithm BTRFS info (device loop0): rebuilding free space tree BTRFS info (device loop0): enabling ssd optimizations BTRFS info (device loop0): turning on flush-on-commit BTRFS info (device loop0): enabling free space tree BTRFS info (device loop0): force clearing of disk cache BTRFS info (device loop0): trying to use backup root at mount time BTRFS info (device loop0): force zlib compression, level 3 BTRFS info (device loop0): balance: start -d -m BTRFS info (device loop0): relocating block group 6881280 flags data|metadata ------------[ cut here ]------------ BTRFS: Transaction aborted (error -28) WARNING: fs/btrfs/volumes.c:3338 at btrfs_remove_chunk+0x1772/0x2020 fs/btrfs/volumes.c:3338, CPU#0: syz.0.0/5346 Modules linked in: CPU: 0 UID: 0 PID: 5346 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_remove_chunk+0x1775/0x2020 fs/btrfs/volumes.c:3338 Code: ed e3 fd e9 12 01 00 00 e8 e8 e2 c9 fd 84 c0 74 28 e8 6f ed e3 fd e9 ff 00 00 00 e8 65 ed e3 fd 48 8d 3d ae 3a ae 0b 44 89 ee <67> 48 0f b9 3a e9 3e f9 ff ff e8 dc 85 7e 07 e8 77 8c 7e 07 41 89 RSP: 0018:ffffc9000de0f8c0 EFLAGS: 00010287 RAX: ffffffff83dd19fb RBX: 0000000000000000 RCX: 0000000000100000 RDX: ffffc90020b12000 RSI: 00000000ffffffe4 RDI: ffffffff8f8b54b0 RBP: ffffc9000de0fab0 R08: ffff888000d2a4c0 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000002 R12: dffffc0000000000 R13: ffffffffffffffe4 R14: ffff88800039c001 R15: ffff888000dc6378 FS: 00007ffaeb0676c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000004000 CR3: 0000000011aab000 CR4: 0000000000352ef0 Call Trace: btrfs_relocate_chunk+0x29b/0x5c0 fs/btrfs/volumes.c:3469 __btrfs_balance+0x18ff/0x24e0 fs/btrfs/volumes.c:4197 btrfs_balance+0xac2/0x11b0 fs/btrfs/volumes.c:4571 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3525 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+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffaea18f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffaeb067038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffaea3e5fa0 RCX: 00007ffaea18f7c9 RDX: 0000200000000180 RSI: 00000000c4009420 RDI: 0000000000000004 RBP: 00007ffaea213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffaea3e6038 R14: 00007ffaea3e5fa0 R15: 00007ffc0811c198 ---------------- Code disassembly (best guess): 0: ed in (%dx),%eax 1: e3 fd jrcxz 0x0 3: e9 12 01 00 00 jmp 0x11a 8: e8 e8 e2 c9 fd call 0xfdc9e2f5 d: 84 c0 test %al,%al f: 74 28 je 0x39 11: e8 6f ed e3 fd call 0xfde3ed85 16: e9 ff 00 00 00 jmp 0x11a 1b: e8 65 ed e3 fd call 0xfde3ed85 20: 48 8d 3d ae 3a ae 0b lea 0xbae3aae(%rip),%rdi # 0xbae3ad5 27: 44 89 ee mov %r13d,%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 3e f9 ff ff jmp 0xfffff972 34: e8 dc 85 7e 07 call 0x77e8615 39: e8 77 8c 7e 07 call 0x77e8cb5 3e: 41 rex.B 3f: 89 .byte 0x89