Hello, syzbot found the following issue on:
HEAD commit: 5f33ebd2018c Merge tag 'drm-fixes-2025-07-26' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15fa4034580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8adfe52da0de2761 dashboard link: https://syzkaller.appspot.com/bug?extid=1733f08e3b98628b164a compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 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-5f33ebd2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a554f67105dc/vmlinux-5f33ebd2.xz kernel image: https://storage.googleapis.com/syzbot-assets/b3d52a10bce9/bzImage-5f33ebd2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: [email protected] ------------[ cut here ]------------ kernel BUG at fs/bcachefs/compress.c:525! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5346 Comm: bch-copygc/loop Not tainted 6.16.0-rc7-syzkaller-00120-g5f33ebd2018c #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:__bio_compress fs/bcachefs/compress.c:525 [inline] RIP: 0010:bch2_bio_compress+0x14b1/0x14c0 fs/bcachefs/compress.c:555 Code: fd 90 0f 0b e8 20 30 90 fd 90 0f 0b e8 18 30 90 fd 90 0f 0b e8 10 30 90 fd 90 0f 0b e8 08 30 90 fd 90 0f 0b e8 00 30 90 fd 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffc9000f51e600 EFLAGS: 00010293 RAX: ffffffff84300110 RBX: 0000000000000003 RCX: ffff88803d990000 RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000000000000000 RBP: ffffc9000f51e850 R08: 0000000000000005 R09: 0000000000000003 R10: ffffc90001a23033 R11: fffff52000344800 R12: 0000000000000800 R13: 0000000100000001 R14: 0000000000000000 R15: 0000000000002800 FS: 0000000000000000(0000) GS:ffff88808d218000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555e44a5168 CR3: 0000000011b80000 CR4: 0000000000352ef0 Call Trace: <TASK> bch2_write_extent fs/bcachefs/io_write.c:1060 [inline] __bch2_write+0xfb5/0x3900 fs/bcachefs/io_write.c:1554 move_write fs/bcachefs/move.c:217 [inline] bch2_moving_ctxt_do_pending_writes+0x5a7/0xe60 fs/bcachefs/move.c:248 bch2_move_ratelimit+0x8e8/0x1330 fs/bcachefs/move.c:585 __bch2_move_data_phys+0x110f/0x1c50 fs/bcachefs/move.c:904 bch2_evacuate_bucket+0x228/0x3a0 fs/bcachefs/move.c:1082 bch2_copygc+0x3be3/0x4510 fs/bcachefs/movinggc.c:234 bch2_copygc_thread+0x97a/0xe00 fs/bcachefs/movinggc.c:409 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__bio_compress fs/bcachefs/compress.c:525 [inline] RIP: 0010:bch2_bio_compress+0x14b1/0x14c0 fs/bcachefs/compress.c:555 Code: fd 90 0f 0b e8 20 30 90 fd 90 0f 0b e8 18 30 90 fd 90 0f 0b e8 10 30 90 fd 90 0f 0b e8 08 30 90 fd 90 0f 0b e8 00 30 90 fd 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffc9000f51e600 EFLAGS: 00010293 RAX: ffffffff84300110 RBX: 0000000000000003 RCX: ffff88803d990000 RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000000000000000 RBP: ffffc9000f51e850 R08: 0000000000000005 R09: 0000000000000003 R10: ffffc90001a23033 R11: fffff52000344800 R12: 0000000000000800 R13: 0000000100000001 R14: 0000000000000000 R15: 0000000000002800 --- 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 [email protected]. 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
