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 (5328) 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 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 -98304 free, is not full BTRFS info (device loop0): space_info total=4194304, used=4096, pinned=0, reserved=0, may_use=98304, 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 98304 reserved 94208 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 131072 reserved 65536 BTRFS info (device loop0): block group 1048576 has 4194304 bytes, 4096 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (4190208 bytes available) [readonly] 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): 4190208 bytes available across all block groups ------------[ cut here ]------------ BTRFS: Transaction aborted (error -28) WARNING: fs/btrfs/block-group.c:4097 at do_chunk_alloc fs/btrfs/block-group.c:4097 [inline], CPU#0: syz.0.0/5328 WARNING: fs/btrfs/block-group.c:4097 at btrfs_chunk_alloc+0x101d/0x15e0 fs/btrfs/block-group.c:4338, CPU#0: syz.0.0/5328 Modules linked in: CPU: 0 UID: 0 PID: 5328 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:do_chunk_alloc fs/btrfs/block-group.c:4097 [inline] RIP: 0010:btrfs_chunk_alloc+0x101f/0x15e0 fs/btrfs/block-group.c:4338 Code: c7 e6 b2 fd e9 6d 01 00 00 e8 5d eb 97 fd 84 c0 74 22 e8 b4 e6 b2 fd e9 5a 01 00 00 e8 aa e6 b2 fd 48 8d 3d 43 63 08 0c 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 f2 26 9b 07 41 89 c6 31 ff 89 c6 RSP: 0018:ffffc900014ce600 EFLAGS: 00010287 RAX: ffffffff8412b0f6 RBX: ffffffffffffffe4 RCX: 0000000000100000 RDX: ffffc90020001000 RSI: 00000000ffffffe4 RDI: ffffffff901b1440 RBP: 0000000000000000 R08: ffff888036432480 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000002 R12: 1ffff11008571b16 R13: ffff888031d64628 R14: ffff888011c74001 R15: ffff888040528800 FS: 00007ff7399216c0(0000) GS:ffff88808ca62000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffda2a9d008 CR3: 000000001fc7b000 CR4: 0000000000352ef0 Call Trace: find_free_extent_update_loop fs/btrfs/extent-tree.c:4306 [inline] find_free_extent+0x52bf/0x5f60 fs/btrfs/extent-tree.c:4727 btrfs_reserve_extent+0x344/0x830 fs/btrfs/extent-tree.c:4821 cow_one_range fs/btrfs/inode.c:1320 [inline] cow_file_range+0x588/0x1310 fs/btrfs/inode.c:1522 writepage_delalloc+0x1270/0x1ee0 fs/btrfs/extent_io.c:1526 extent_writepage fs/btrfs/extent_io.c:1893 [inline] extent_write_cache_pages fs/btrfs/extent_io.c:2580 [inline] btrfs_writepages+0x14df/0x2440 fs/btrfs/extent_io.c:2713 do_writepages+0x32e/0x550 mm/page-writeback.c:2554 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x1ef/0x2f0 mm/filemap.c:412 btrfs_fdatawrite_range+0x54/0xf0 fs/btrfs/file.c:3891 btrfs_direct_write+0x5e9/0xb70 fs/btrfs/direct-io.c:987 btrfs_do_write_iter+0x39c/0x880 fs/btrfs/file.c:1458 iter_file_splice_write+0x99b/0x1100 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x101/0x160 fs/splice.c:1161 splice_direct_to_actor+0x53a/0xc70 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x195/0x290 fs/splice.c:1230 do_sendfile+0x535/0x7d0 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419 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: 0033:0x7ff73899bf79 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:00007ff739921028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ff738c15fa0 RCX: 00007ff73899bf79 RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000000007 RBP: 00007ff738a327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff738c16038 R14: 00007ff738c15fa0 R15: 00007ffda2a9ccd8 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e6 b2 out %al,$0xb2 2: fd std 3: e9 6d 01 00 00 jmp 0x175 8: e8 5d eb 97 fd call 0xfd97eb6a d: 84 c0 test %al,%al f: 74 22 je 0x33 11: e8 b4 e6 b2 fd call 0xfdb2e6ca 16: e9 5a 01 00 00 jmp 0x175 1b: e8 aa e6 b2 fd call 0xfdb2e6ca 20: 48 8d 3d 43 63 08 0c lea 0xc086343(%rip),%rdi # 0xc08636a 27: 89 de mov %ebx,%esi * 29: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2e: e9 b3 fc ff ff jmp 0xfffffce6 33: e8 f2 26 9b 07 call 0x79b272a 38: 41 89 c6 mov %eax,%r14d 3b: 31 ff xor %edi,%edi 3d: 89 c6 mov %eax,%esi