syzbot has found a reproducer for the following issue on: HEAD commit: f486c8aa16b8 Add linux-next specific files for 20241128 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=136ba7c0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e348a4873516af92 dashboard link: https://syzkaller.appspot.com/bug?extid=06023121b0153752a3d3 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119abf78580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1527dd30580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/beb58ebb63cf/disk-f486c8aa.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b241b5609e64/vmlinux-f486c8aa.xz kernel image: https://storage.googleapis.com/syzbot-assets/c9d817f665f2/bzImage-f486c8aa.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+06023121b0153752a3d3@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 35 at fs/netfs/write_issue.c:583 netfs_writepages+0x8ff/0xb60 fs/netfs/write_issue.c:583 Modules linked in: CPU: 1 UID: 0 PID: 35 Comm: kworker/u8:2 Not tainted 6.12.0-next-20241128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: writeback wb_workfn (flush-9p-1) RIP: 0010:netfs_writepages+0x8ff/0xb60 fs/netfs/write_issue.c:583 Code: 10 4c 89 f2 48 8d 4c 24 70 e8 ad a6 85 ff 48 85 c0 0f 84 e6 00 00 00 48 89 c3 e8 cc dc 49 ff e9 4a fe ff ff e8 c2 dc 49 ff 90 <0f> 0b 90 e9 a9 fe ff ff e8 b4 dc 49 ff 4c 89 e7 be 08 00 00 00 e8 RSP: 0018:ffffc90000ab70c0 EFLAGS: 00010293 RAX: ffffffff8255983e RBX: 810f000000000000 RCX: ffff888020a9da00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 810f000000000000 RBP: ffffc90000ab7190 R08: ffffffff825596e2 R09: 1ffff1100415a855 R10: dffffc0000000000 R11: ffffed100415a856 R12: ffff888020ad42d8 R13: dffffc0000000000 R14: ffffea0001b5e580 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f475ed5bd58 CR3: 00000000771b4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> do_writepages+0x35f/0x880 mm/page-writeback.c:2702 __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1680 writeback_sb_inodes+0x820/0x1360 fs/fs-writeback.c:1976 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2047 wb_writeback+0x427/0xb80 fs/fs-writeback.c:2158 wb_check_background_flush fs/fs-writeback.c:2228 [inline] wb_do_writeback fs/fs-writeback.c:2316 [inline] wb_workfn+0xc4b/0x1080 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> --- 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.
