------------[ 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.0.0/5348 WARNING: fs/btrfs/block-group.c:4012 at btrfs_chunk_alloc+0x101d/0x15d0 fs/btrfs/block-group.c:4253, CPU#0: syz.0.0/5348 Modules linked in: CPU: 0 UID: 0 PID: 5348 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: a7 87 c9 fd e9 6d 01 00 00 e8 bd 7c af fd 84 c0 74 22 e8 94 87 c9 fd e9 5a 01 00 00 e8 8a 87 c9 fd 48 8d 3d b3 1b 94 0b 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 82 16 64 07 41 89 c6 31 ff 89 c6 RSP: 0018:ffffc9000ad6e9d8 EFLAGS: 00010283 RAX: ffffffff83f77fd6 RBX: ffffffffffffffe4 RCX: 0000000000100000 RDX: ffffc90021383000 RSI: 00000000ffffffe4 RDI: ffffffff8f8b9b90 RBP: 0000000000000000 R08: ffff888000b40000 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000002 R12: 1ffff110082a6a16 R13: ffff8880463e1ac8 R14: ffff888035dec001 R15: ffff888011e09000 FS: 00007fd23cbf56c0(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055caf0812720 CR3: 0000000042790000 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 cow_file_range+0x4d1/0x10a0 fs/btrfs/inode.c:1366 writepage_delalloc+0xf06/0x1a60 fs/btrfs/extent_io.c:1501 extent_writepage fs/btrfs/extent_io.c:1864 [inline] extent_write_cache_pages fs/btrfs/extent_io.c:2552 [inline] btrfs_writepages+0x12fd/0x21e0 fs/btrfs/extent_io.c:2685 do_writepages+0x32e/0x550 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x1a5/0x250 mm/filemap.c:412 btrfs_fdatawrite_range+0x54/0xf0 fs/btrfs/file.c:3891 btrfs_wait_ordered_range+0x59/0x260 fs/btrfs/ordered-data.c:917 btrfs_clone_files+0x29c/0x390 fs/btrfs/reflink.c:759 btrfs_remap_file_range+0x6b9/0x1320 fs/btrfs/reflink.c:895 vfs_copy_file_range+0xd81/0x1370 fs/read_write.c:1598 __do_sys_copy_file_range fs/read_write.c:1681 [inline] __se_sys_copy_file_range+0x2fb/0x470 fs/read_write.c:1648 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: 0033:0x7fd24078f7c9 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:00007fd23cbf5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146 RAX: ffffffffffffffda RBX: 00007fd2409e6090 RCX: 00007fd24078f7c9 RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000009 RBP: 00007fd240813f91 R08: 0000000000000006 R09: 0000000000000000 R10: 00002000000000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd2409e6128 R14: 00007fd2409e6090 R15: 00007fff7a302a68 ---------------- Code disassembly (best guess): 0: a7 cmpsl %es:(%rdi),%ds:(%rsi) 1: 87 c9 xchg %ecx,%ecx 3: fd std 4: e9 6d 01 00 00 jmp 0x176 9: e8 bd 7c af fd call 0xfdaf7ccb e: 84 c0 test %al,%al 10: 74 22 je 0x34 12: e8 94 87 c9 fd call 0xfdc987ab 17: e9 5a 01 00 00 jmp 0x176 1c: e8 8a 87 c9 fd call 0xfdc987ab 21: 48 8d 3d b3 1b 94 0b lea 0xb941bb3(%rip),%rdi # 0xb941bdb 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 82 16 64 07 call 0x76416bb 39: 41 89 c6 mov %eax,%r14d 3c: 31 ff xor %edi,%edi 3e: 89 c6 mov %eax,%esi