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Message-ID: <68c4169d.050a0220.2ff435.035c.GAE@google.com> Date: Fri, 12 Sep 2025 05:48:29 -0700 From: syzbot <syzbot+86d3938ade3c1d827514@...kaller.appspotmail.com> To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [bcachefs?] kernel BUG in bch2_quota_transfer (2) Hello, syzbot found the following issue on: HEAD commit: 76eeb9b8de98 Linux 6.17-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1483f312580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c7f605fd273c8220 dashboard link: https://syzkaller.appspot.com/bug?extid=86d3938ade3c1d827514 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-76eeb9b8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/658515dceee8/vmlinux-76eeb9b8.xz kernel image: https://storage.googleapis.com/syzbot-assets/ee40b9e4370a/bzImage-76eeb9b8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+86d3938ade3c1d827514@...kaller.appspotmail.com /, fixing done bcachefs (loop0): check_xattrs... bcachefs (loop0): key in missing inode, found keys: u64s 7 type xattr 1073741824:945502502804528484:U32_MAX len 0 ver 0: user.xattr2:xattr2 u64s 7 type xattr 1073741824:3442546108204556527:U32_MAX len 0 ver 0: user.xattr1:xattr1 , fixing bcachefs (loop0): key in missing inode, found keys: u64s 7 type xattr 1073741824:3442546108204556527:U32_MAX len 0 ver 0: user.xattr1:xattr1 , fixing done bcachefs (loop0): check_root... done bcachefs (loop0): check_unreachable_inodes... done bcachefs (loop0): check_subvolume_structure... done bcachefs (loop0): check_directory_structure... done bcachefs (loop0): check_nlinks... done bcachefs (loop0): check_rebalance_work... done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): delete_dead_inodes... done bcachefs (loop0): set_fs_needs_rebalance... done bcachefs (loop0): Fixed errors, running fsck a second time to verify fs is clean bcachefs (loop0): check_alloc_info... done bcachefs (loop0): check_lrus... done bcachefs (loop0): check_btree_backpointers... done bcachefs (loop0): check_backpointers_to_extents... done bcachefs (loop0): check_extents_to_backpointers... done bcachefs (loop0): check_alloc_to_lru_refs... done bcachefs (loop0): check_snapshot_trees... done bcachefs (loop0): check_snapshots... done bcachefs (loop0): check_subvols... done bcachefs (loop0): check_subvol_children... done bcachefs (loop0): delete_dead_snapshots... done bcachefs (loop0): check_inodes... done bcachefs (loop0): check_extents... done bcachefs (loop0): check_indirect_extents... done bcachefs (loop0): check_dirents... done bcachefs (loop0): check_xattrs... done bcachefs (loop0): check_root... done bcachefs (loop0): check_unreachable_inodes... done bcachefs (loop0): check_subvolume_structure... done bcachefs (loop0): check_directory_structure... done bcachefs (loop0): check_nlinks... done bcachefs (loop0): check_rebalance_work... done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): delete_dead_inodes... done bcachefs (loop0): set_fs_needs_rebalance... done bcachefs (loop0): reading quotas bcachefs (loop0): quotas done bcachefs (loop0): done starting filesystem ------------[ cut here ]------------ kernel BUG at fs/bcachefs/quota.c:319! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5353 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:__bch2_quota_transfer fs/bcachefs/quota.c:319 [inline] RIP: 0010:bch2_quota_transfer+0xa29/0xa50 fs/bcachefs/quota.c:367 Code: ff ff 89 f9 80 e1 07 38 c1 0f 8c 72 f7 ff ff 48 89 d3 e8 0a fc d1 fd 48 89 da e9 62 f7 ff ff e8 cd 54 29 07 e8 68 0c 6d fd 90 <0f> 0b e8 60 0c 6d fd 90 0f 0b e8 58 0c 6d fd 90 0f 0b e8 50 0c 6d RSP: 0018:ffffc9000f40f700 EFLAGS: 00010283 RAX: ffffffff8452b228 RBX: 0000000000000000 RCX: 0000000000100000 RDX: ffffc9000dbd2000 RSI: 00000000000008db RDI: 00000000000008dc RBP: ffffc9000f40f8b0 R08: 0000000000000001 R09: 0000000000000001 R10: dffffc0000000000 R11: fffffbfff1f47807 R12: 0000000000000000 R13: ffff8880343d7c28 R14: 1ffff11007ff820a R15: dffffc0000000000 FS: 00007f3e39d976c0(0000) GS:ffff88808d20c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000004000 CR3: 0000000043f9a000 CR4: 0000000000352ef0 Call Trace: <TASK> bch2_fs_quota_transfer+0x27d/0x4f0 fs/bcachefs/fs.c:183 bch2_setattr_nonsize+0x3a6/0x10e0 fs/bcachefs/fs.c:1122 notify_change+0xb33/0xe40 fs/attr.c:552 chown_common+0x40c/0x5c0 fs/open.c:791 vfs_fchown fs/open.c:859 [inline] ksys_fchown+0xea/0x160 fs/open.c:871 __do_sys_fchown fs/open.c:876 [inline] __se_sys_fchown fs/open.c:874 [inline] __x64_sys_fchown+0x7a/0x90 fs/open.c:874 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3e38f8ebe9 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:00007f3e39d97038 EFLAGS: 00000246 ORIG_RAX: 000000000000005d RAX: ffffffffffffffda RBX: 00007f3e391c5fa0 RCX: 00007f3e38f8ebe9 RDX: 000000000000000a RSI: 000000003a736e6f RDI: 0000000000000006 RBP: 00007f3e39011e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3e391c6038 R14: 00007f3e391c5fa0 R15: 00007ffd7c15f018 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__bch2_quota_transfer fs/bcachefs/quota.c:319 [inline] RIP: 0010:bch2_quota_transfer+0xa29/0xa50 fs/bcachefs/quota.c:367 Code: ff ff 89 f9 80 e1 07 38 c1 0f 8c 72 f7 ff ff 48 89 d3 e8 0a fc d1 fd 48 89 da e9 62 f7 ff ff e8 cd 54 29 07 e8 68 0c 6d fd 90 <0f> 0b e8 60 0c 6d fd 90 0f 0b e8 58 0c 6d fd 90 0f 0b e8 50 0c 6d RSP: 0018:ffffc9000f40f700 EFLAGS: 00010283 RAX: ffffffff8452b228 RBX: 0000000000000000 RCX: 0000000000100000 RDX: ffffc9000dbd2000 RSI: 00000000000008db RDI: 00000000000008dc RBP: ffffc9000f40f8b0 R08: 0000000000000001 R09: 0000000000000001 R10: dffffc0000000000 R11: fffffbfff1f47807 R12: 0000000000000000 R13: ffff8880343d7c28 R14: 1ffff11007ff820a R15: dffffc0000000000 FS: 00007f3e39d976c0(0000) GS:ffff88808d20c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3e39d75fc8 CR3: 0000000043f9a000 CR4: 0000000000352ef0 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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