On 2023-07-05 at 23:33:43 -0700, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: 6843306689af Merge tag 'net-6.5-rc1' of git://git.kernel.o.. > git tree: net > console output: https://syzkaller.appspot.com/x/log.txt?x=114522aca80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=7ad417033279f15a > dashboard link: https://syzkaller.appspot.com/bug?extid=5050ad0fb47527b1808a > 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=102cb190a80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17c49d90a80000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/f6adc10dbd71/disk-68433066.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/5c3fa1329201/vmlinux-68433066.xz > kernel image: https://storage.googleapis.com/syzbot-assets/84db3452bac5/bzImage-68433066.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+5050ad0fb47527b1808a@xxxxxxxxxxxxxxxxxxxxxxxxx > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 5382 at fs/ext4/file.c:611 ext4_dio_write_iter fs/ext4/file.c:611 [inline] > WARNING: CPU: 1 PID: 5382 at fs/ext4/file.c:611 ext4_file_write_iter+0x1470/0x1880 fs/ext4/file.c:720 > Modules linked in: > CPU: 1 PID: 5382 Comm: syz-executor288 Not tainted 6.4.0-syzkaller-11989-g6843306689af #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 > RIP: 0010:ext4_dio_write_iter fs/ext4/file.c:611 [inline] > RIP: 0010:ext4_file_write_iter+0x1470/0x1880 fs/ext4/file.c:720 > Code: 84 03 00 00 48 8b 04 24 31 ff 8b 40 20 89 c3 89 44 24 10 83 e3 08 89 de e8 5d 5a 5b ff 85 db 0f 85 d5 fc ff ff e8 30 5e 5b ff <0f> 0b e9 c9 fc ff ff e8 24 5e 5b ff 48 8b 4c 24 40 4c 89 fa 4c 89 > RSP: 0018:ffffc9000522fc30 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: ffff8880277a3b80 RSI: ffffffff82298140 RDI: 0000000000000005 > RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8a832a60 > R13: 0000000000000000 R14: 0000000000000000 R15: fffffffffffffff5 > FS: 00007f154db95700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f154db74718 CR3: 000000006bcc7000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > call_write_iter include/linux/fs.h:1871 [inline] > new_sync_write fs/read_write.c:491 [inline] > vfs_write+0x981/0xda0 fs/read_write.c:584 > ksys_write+0x122/0x250 fs/read_write.c:637 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7f154dc094f9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f154db952f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00007f154dc924f0 RCX: 00007f154dc094f9 > RDX: 0000000000248800 RSI: 0000000020000000 RDI: 0000000000000006 > RBP: 00007f154dc5f628 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 652e79726f6d656d > R13: 656c6c616b7a7973 R14: 6465646165726874 R15: 00007f154dc924f8 > </TASK> > Above issue in dmesg is: "WARNING: CPU: 1 PID: 5382 at fs/ext4/file.c:611 ext4_dio_write_iter fs/ext4/file.c:611 [inline]" I found the similar behavior issue: "WARNING: CPU: 0 PID: 182134 at fs/ext4/file.c:611 ext4_dio_write_iter fs/ext4/file.c:611 [inline]" repro.report shows similar details. Updated the bisect info for the above similar issue: Bisected and the problem commit was: " 310ee0902b8d9d0a13a5a13e94688a5863fa29c2: ext4: allow concurrent unaligned dio overwrites " After reverted the commit on top of v6.5-rc3, this issue was gone. All information: https://github.com/xupengfe/syzkaller_logs/tree/main/230730_134501_ext4_file_write_iter Reproduced code: https://github.com/xupengfe/syzkaller_logs/blob/main/230730_134501_ext4_file_write_iter/repro.c repro.prog(syscall reproduced steps): https://github.com/xupengfe/syzkaller_logs/blob/main/230730_134501_ext4_file_write_iter/repro.prog repro.report: https://github.com/xupengfe/syzkaller_logs/blob/main/230730_134501_ext4_file_write_iter/repro.report Bisect log: https://github.com/xupengfe/syzkaller_logs/blob/main/230730_134501_ext4_file_write_iter/bisect_info.log Kconfig: https://github.com/xupengfe/syzkaller_logs/blob/main/230730_134501_ext4_file_write_iter/kconfig_origin Issue dmesg: https://github.com/xupengfe/syzkaller_logs/blob/main/230730_134501_ext4_file_write_iter/6eaae198076080886b9e7d57f4ae06fa782f90ef_dmesg.log Best Regards, Thanks! > > --- > 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.
