Hello, syzbot found the following issue on: HEAD commit: 7e062cda7d90 Merge tag 'net-next-5.19' of git://git.kernel.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=172151d3f00000 kernel config: https://syzkaller.appspot.com/x/.config?x=e9d71d3c07c36588 dashboard link: https://syzkaller.appspot.com/bug?extid=3ba551855046ba3b3806 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12918503f00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1386fa39f00000 Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14107ee5f00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=16107ee5f00000 console output: https://syzkaller.appspot.com/x/log.txt?x=12107ee5f00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3ba551855046ba3b3806@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 3610 at kernel/dma/mapping.c:188 dma_map_sgtable+0x203/0x260 kernel/dma/mapping.c:264 Modules linked in: CPU: 0 PID: 3610 Comm: syz-executor162 Not tainted 5.18.0-syzkaller-04943-g7e062cda7d90 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__dma_map_sg_attrs kernel/dma/mapping.c:188 [inline] RIP: 0010:dma_map_sgtable+0x203/0x260 kernel/dma/mapping.c:264 Code: 75 15 e8 50 5f 14 00 eb cb e8 49 5f 14 00 eb c4 e8 42 5f 14 00 eb bd e8 3b 5f 14 00 0f 0b bd fb ff ff ff eb af e8 2d 5f 14 00 <0f> 0b 31 ed 48 bb 00 00 00 00 00 fc ff df e9 7b ff ff ff 89 e9 80 RSP: 0018:ffffc9000305fd40 EFLAGS: 00010293 RAX: ffffffff81723873 RBX: dffffc0000000000 RCX: ffff88801fbb8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: ffff8881487e5408 R08: ffffffff81723743 R09: ffffed1003592c9e R10: ffffed1003592c9e R11: 1ffff11003592c9c R12: ffff8881487e5000 R13: ffff88801ac964e0 R14: 0000000000000000 R15: 0000000000000001 FS: 0000555556c2a300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005d84c8 CR3: 000000001f1ef000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> get_sg_table+0xf9/0x150 drivers/dma-buf/udmabuf.c:72 begin_cpu_udmabuf+0xf5/0x160 drivers/dma-buf/udmabuf.c:126 dma_buf_begin_cpu_access+0xd8/0x170 drivers/dma-buf/dma-buf.c:1172 dma_buf_ioctl+0x2a0/0x2f0 drivers/dma-buf/dma-buf.c:363 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f8bf9c6dc19 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd7cfae1d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8bf9c6dc19 RDX: 0000000020000100 RSI: 0000000040086200 RDI: 0000000000000006 RBP: 00007f8bf9c31dc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8bf9c31e50 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </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 syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
