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 (5347) 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): enabling ssd optimizations BTRFS info (device loop0): turning on async discard BTRFS info (device loop0): enabling free space tree ------------[ cut here ]------------ BTRFS: Transaction aborted (error -28) WARNING: fs/btrfs/block-group.c:4012 at do_chunk_alloc fs/btrfs/block-group.c:4012 [inline], CPU#0: syz.0.0/5347 WARNING: fs/btrfs/block-group.c:4012 at btrfs_chunk_alloc+0x101d/0x15d0 fs/btrfs/block-group.c:4253, CPU#0: syz.0.0/5347 Modules linked in: CPU: 0 UID: 0 PID: 5347 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:do_chunk_alloc fs/btrfs/block-group.c:4012 [inline] RIP: 0010:btrfs_chunk_alloc+0x101f/0x15d0 fs/btrfs/block-group.c:4253 Code: 47 84 c9 fd e9 6d 01 00 00 e8 ad 79 af fd 84 c0 74 22 e8 34 84 c9 fd e9 5a 01 00 00 e8 2a 84 c9 fd 48 8d 3d 83 1c 94 0b 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 42 23 64 07 41 89 c6 31 ff 89 c6 RSP: 0018:ffffc9000814f3d8 EFLAGS: 00010287 RAX: ffffffff83f78336 RBX: ffffffffffffffe4 RCX: 0000000000100000 RDX: ffffc90021462000 RSI: 00000000ffffffe4 RDI: ffffffff8f8b9fc0 RBP: 0000000000000000 R08: ffff88800091a4c0 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000002 R12: 1ffff11002237916 R13: ffff8880474ab500 R14: ffff88803592c001 R15: ffff888040d70800 FS: 00007fa6e4aa46c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3ff3defe30 CR3: 0000000011a79000 CR4: 0000000000352ef0 Call Trace: find_free_extent_update_loop fs/btrfs/extent-tree.c:4199 [inline] find_free_extent+0x45b7/0x5d00 fs/btrfs/extent-tree.c:4611 btrfs_reserve_extent+0x2c7/0x780 fs/btrfs/extent-tree.c:4705 __btrfs_prealloc_file_range+0x2a1/0xcf0 fs/btrfs/inode.c:9101 btrfs_prealloc_file_range+0x40/0x60 fs/btrfs/inode.c:9194 btrfs_fallocate+0x14a1/0x1c10 fs/btrfs/file.c:3250 vfs_fallocate+0x669/0x7e0 fs/open.c:339 ksys_fallocate fs/open.c:363 [inline] __do_sys_fallocate fs/open.c:368 [inline] __se_sys_fallocate fs/open.c:366 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:366 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: 0033:0x7fa6e3b8f7c9 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:00007fa6e4aa4038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fa6e3de6090 RCX: 00007fa6e3b8f7c9 RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007fa6e3c13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000f4 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa6e3de6128 R14: 00007fa6e3de6090 R15: 00007ffe4d4af5b8 ---------------- Code disassembly (best guess): 0: 47 84 c9 rex.RXB test %r9b,%r9b 3: fd std 4: e9 6d 01 00 00 jmp 0x176 9: e8 ad 79 af fd call 0xfdaf79bb e: 84 c0 test %al,%al 10: 74 22 je 0x34 12: e8 34 84 c9 fd call 0xfdc9844b 17: e9 5a 01 00 00 jmp 0x176 1c: e8 2a 84 c9 fd call 0xfdc9844b 21: 48 8d 3d 83 1c 94 0b lea 0xb941c83(%rip),%rdi # 0xb941cab 28: 89 de mov %ebx,%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 b3 fc ff ff jmp 0xfffffce7 34: e8 42 23 64 07 call 0x764237b 39: 41 89 c6 mov %eax,%r14d 3c: 31 ff xor %edi,%edi 3e: 89 c6 mov %eax,%esi