Hello, syzbot found the following issue on: HEAD commit: 51f269a6ecc7 Merge tag 'probes-fixes-6.4-rc4' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15ed0e7d280000 kernel config: https://syzkaller.appspot.com/x/.config?x=3da6c5d3e0a6c932 dashboard link: https://syzkaller.appspot.com/bug?extid=5c04210f7c7f897c1e7f compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1336c6b5280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c0a5a5280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8a8c8e41a6b0/disk-51f269a6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ffc3737b4233/vmlinux-51f269a6.xz kernel image: https://storage.googleapis.com/syzbot-assets/d49888e5beb1/bzImage-51f269a6.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/99d35f050c12/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5c04210f7c7f897c1e7f@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ kernel BUG at fs/buffer.c:391! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.4.0-rc4-syzkaller-00268-g51f269a6ecc7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 RIP: 0010:end_buffer_async_write+0x2db/0x340 fs/buffer.c:391 Code: 65 00 fe 4c 89 ff e8 d4 a3 ff ff be 08 00 00 00 48 89 c7 48 89 c3 e8 b4 31 e0 ff f0 80 4b 01 01 e9 07 fe ff ff e8 45 62 8d ff <0f> 0b e8 3e 62 8d ff 0f 0b 48 89 df e8 34 2b e0 ff e9 d9 fe ff ff RSP: 0018:ffffc90000147c98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: ffff88801664bb80 RSI: ffffffff81f6e3fb RDI: 0000000000000001 RBP: ffff88806fbde570 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff81f6e120 R14: ffff88801e24ee00 R15: ffff88802a45a788 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f42b45b0000 CR3: 000000007b04a000 CR4: 0000000000350ef0 Call Trace: <TASK> end_bio_bh_io_sync+0xde/0x130 fs/buffer.c:2730 bio_endio+0x5af/0x6c0 block/bio.c:1608 req_bio_endio block/blk-mq.c:761 [inline] blk_update_request+0x5c5/0x1620 block/blk-mq.c:906 blk_mq_end_request+0x59/0x4c0 block/blk-mq.c:1023 lo_complete_rq+0x1c6/0x280 drivers/block/loop.c:370 blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1101 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:939 [inline] run_ksoftirqd+0x31/0x60 kernel/softirq.c:931 smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:end_buffer_async_write+0x2db/0x340 fs/buffer.c:391 Code: 65 00 fe 4c 89 ff e8 d4 a3 ff ff be 08 00 00 00 48 89 c7 48 89 c3 e8 b4 31 e0 ff f0 80 4b 01 01 e9 07 fe ff ff e8 45 62 8d ff <0f> 0b e8 3e 62 8d ff 0f 0b 48 89 df e8 34 2b e0 ff e9 d9 fe ff ff RSP: 0018:ffffc90000147c98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: ffff88801664bb80 RSI: ffffffff81f6e3fb RDI: 0000000000000001 RBP: ffff88806fbde570 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff81f6e120 R14: ffff88801e24ee00 R15: ffff88802a45a788 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f42b45b0000 CR3: 000000007b04a000 CR4: 0000000000350ef0 --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
