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* [syzbot] [btrfs?] WARNING in btrfs_add_reserved_bytes
@ 2023-09-25 18:58 syzbot
  0 siblings, 0 replies; only message in thread
From: syzbot @ 2023-09-25 18:58 UTC (permalink / raw)
  To: clm, dsterba, josef, linux-btrfs, linux-fsdevel, linux-kernel,


syzbot found the following issue on:

HEAD commit:    42dc814987c1 Merge tag 'media/v6.6-2' of git://git.kernel...
git tree:       upstream
console output:
kernel config:
dashboard link:
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image:
kernel image:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5082 at fs/btrfs/space-info.h:198 btrfs_add_reserved_bytes+0x4b4/0x7b0 fs/btrfs/block-group.c:3694
Modules linked in:
CPU: 1 PID: 5082 Comm: syz-executor.2 Not tainted 6.6.0-rc2-syzkaller-00048-g42dc814987c1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:btrfs_space_info_update_bytes_may_use fs/btrfs/space-info.h:198 [inline]
RIP: 0010:btrfs_add_reserved_bytes+0x4b4/0x7b0 fs/btrfs/block-group.c:3694
Code: 5c 24 28 74 08 48 89 df e8 59 ef 32 fe 48 8b 2b 48 89 ef 48 8b 5c 24 30 48 89 de e8 16 89 d8 fd 48 39 dd 73 0b e8 fc 86 d8 fd <0f> 0b 31 ed eb 26 e8 f1 86 d8 fd 48 8b 5c 24 28 48 8b 44 24 40 42
RSP: 0018:ffffc9000421ed70 EFLAGS: 00010293
RAX: ffffffff83b58404 RBX: 0000000000001000 RCX: ffff88801cd80000
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff83b583fa R09: 1ffffffff1d34cfd
R10: dffffc0000000000 R11: fffffbfff1d34cfe R12: ffff88807be76800
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000001000
FS:  0000555556b91480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3123a06d58 CR3: 00000000821cd000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 find_free_extent+0x3aa1/0x5770 fs/btrfs/extent-tree.c:4387
 btrfs_reserve_extent+0x422/0x800 fs/btrfs/extent-tree.c:4514
 btrfs_alloc_tree_block+0x20e/0x1800 fs/btrfs/extent-tree.c:4929
 __btrfs_cow_block+0x465/0x1b00 fs/btrfs/ctree.c:546
 btrfs_cow_block+0x403/0x780 fs/btrfs/ctree.c:712
 commit_cowonly_roots+0x197/0x860 fs/btrfs/transaction.c:1299
 btrfs_commit_transaction+0xff4/0x3720 fs/btrfs/transaction.c:2435
 close_ctree+0x3dd/0xd40 fs/btrfs/disk-io.c:4356
 generic_shutdown_super+0x13a/0x2c0 fs/super.c:693
 kill_anon_super+0x3b/0x70 fs/super.c:1292
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2144
 deactivate_locked_super+0xa4/0x110 fs/super.c:481
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254
 task_work_run+0x24a/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
RIP: 0033:0x7f0019a7de17
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc591d0408 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f0019a7de17
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc591d04c0
RBP: 00007ffc591d04c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc591d1580
R13: 00007f0019ac73b9 R14: 00000000001f9f05 R15: 000000000000000d

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2023-09-25 18:58 [syzbot] [btrfs?] WARNING in btrfs_add_reserved_bytes syzbot

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