syzbot has found a reproducer for the following issue on: HEAD commit: cd8c917a56f2 Makefile: Do not quote value for CONFIG_CC_IM.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=139ff2e5b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=221ffc09e39ebbd1 dashboard link: https://syzkaller.appspot.com/bug?extid=e417648b303855b91d8a compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17a68531b00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16b91d89b00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e417648b303855b91d8a@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6516 at drivers/i2c/i2c-core-base.c:2178 __i2c_transfer+0xa14/0x17c0 drivers/i2c/i2c-core-base.c:2178 Modules linked in: CPU: 1 PID: 6516 Comm: syz-executor214 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__i2c_transfer+0xa14/0x17c0 drivers/i2c/i2c-core-base.c:2178 Code: 0f 94 c7 31 ff 44 89 fe e8 39 d9 9b fb 45 84 ff 0f 84 26 fd ff ff e8 4b d5 9b fb e8 95 6f 24 fb e9 17 fd ff ff e8 3c d5 9b fb <0f> 0b 41 bc ea ff ff ff e9 9e fd ff ff e8 2a d5 9b fb 44 89 ee bf RSP: 0018:ffffc900029dfce8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000010 RCX: 0000000000000000 RDX: ffff88807929ba00 RSI: ffffffff85dbd5b4 RDI: 0000000000000003 RBP: ffff888021b94b58 R08: 0000000000000000 R09: ffffffff8ff73acf R10: ffffffff85dbcbd8 R11: 0000000000000000 R12: 0000000000000010 R13: 0000000000000000 R14: ffff888021b94b78 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0063) knlGS:00000000576f92c0 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007fa70f9116c0 CR3: 000000007f540000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> i2c_transfer+0x1e6/0x3e0 drivers/i2c/i2c-core-base.c:2269 i2cdev_ioctl_rdwr+0x583/0x6a0 drivers/i2c/i2c-dev.c:297 compat_i2cdev_ioctl+0x419/0x4f0 drivers/i2c/i2c-dev.c:561 __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:972 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f41549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000ffd6affc EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000707 RDX: 0000000020000700 RSI: 00000000ffd6b050 RDI: 00000000f7fe8000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
