Hello, syzbot found the following issue on: HEAD commit: 708283abf896 Merge tag 'dmaengine-6.6-rc1' of git://git.ke.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=14142f38680000 kernel config: https://syzkaller.appspot.com/x/.config?x=1dc3cb855cd74c2 dashboard link: https://syzkaller.appspot.com/bug?extid=a532b03fdfee2c137666 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=115bfbf4680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13896ed0680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1bd71e72bfd8/disk-708283ab.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b1cd0be2dff5/vmlinux-708283ab.xz kernel image: https://storage.googleapis.com/syzbot-assets/ff76c3f9ca24/bzImage-708283ab.xz The issue was bisected to: commit a41dad905e5a388f88435a517de102e9b2c8e43d Author: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Date: Fri Sep 16 00:11:15 2022 +0000 iov_iter: saner checks for attempt to copy to/from iterator bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=127483b8680000 final oops: https://syzkaller.appspot.com/x/report.txt?x=117483b8680000 console output: https://syzkaller.appspot.com/x/log.txt?x=167483b8680000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a532b03fdfee2c137666@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: a41dad905e5a ("iov_iter: saner checks for attempt to copy to/from iterator") ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5033 at lib/iov_iter.c:385 _copy_from_iter+0x2c2/0x1270 lib/iov_iter.c:385 Modules linked in: CPU: 1 PID: 5033 Comm: syz-executor399 Not tainted 6.5.0-syzkaller-11329-g708283abf896 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:_copy_from_iter+0x2c2/0x1270 lib/iov_iter.c:385 Code: 5d 41 5c 41 5d 41 5e 41 5f c3 e8 f9 8c 65 fd be 85 01 00 00 48 c7 c7 a0 94 e8 8a e8 d8 37 a5 fd e9 48 fe ff ff e8 de 8c 65 fd <0f> 0b 45 31 ff eb 88 e8 d2 8c 65 fd 31 ff 89 ee e8 f9 87 65 fd 40 RSP: 0018:ffffc900043c7480 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888014b03b80 RSI: ffffffff84220fb2 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8a60008b R12: 0000000000000001 R13: ffffc900043c76c8 R14: 0000000000000001 R15: 0000160000000000 FS: 0000555555a41380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200000c8 CR3: 000000007ebb3000 CR4: 0000000000350ee0 Call Trace: <TASK> copy_page_from_iter lib/iov_iter.c:542 [inline] copy_page_from_iter+0xa5/0x120 lib/iov_iter.c:531 bio_copy_from_iter block/blk-map.c:56 [inline] bio_copy_user_iov block/blk-map.c:211 [inline] blk_rq_map_user_iov+0x9d5/0x1860 block/blk-map.c:662 blk_rq_map_user_io.part.0+0x276/0x2c0 block/blk-map.c:720 blk_rq_map_user_io+0xe6/0x230 block/blk-map.c:701 sg_start_req drivers/scsi/sg.c:1818 [inline] sg_common_write.constprop.0+0xd61/0x1c90 drivers/scsi/sg.c:803 sg_new_write.isra.0+0x546/0xaa0 drivers/scsi/sg.c:770 sg_ioctl_common drivers/scsi/sg.c:935 [inline] sg_ioctl+0x1814/0x2760 drivers/scsi/sg.c:1160 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4cd02c0229 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2da41248 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fff2da41418 RCX: 00007f4cd02c0229 RDX: 0000000020000300 RSI: 0000000000002285 RDI: 0000000000000003 RBP: 00007f4cd0333610 R08: 00007fff2da41418 R09: 00007fff2da41418 R10: 002367732f766564 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff2da41408 R14: 0000000000000001 R15: 0000000000000001 </TASK> --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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 overwrite 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
