sg_write: data in/out 8454115/514 bytes for SCSI command 0x0-- guessing data in; program syzkaller388557 not setting count and/or reply_len properly kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 3374 Comm: syzkaller388557 Not tainted 4.9.77-ge12a9c4 #27 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801c8e68000 task.stack: ffff8801ceec8000 RIP: 0010:[] [] sg_read_oxfer drivers/scsi/sg.c:1976 [inline] RIP: 0010:[] [] sg_read+0xd0c/0x1440 drivers/scsi/sg.c:520 RSP: 0018:ffff8801ceecfa50 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff826699d3 RDX: 0000000000000000 RSI: 000000000000001a RDI: ffff8801c6838170 RBP: ffff8801ceecfb58 R08: 0000000000000000 R09: ffffed00391d1a11 R10: 0000000000000005 R11: ffffed00391d1a10 R12: 0000000000001000 R13: 0000000000000000 R14: ffff8801c8e8d060 R15: ffff8801c6838140 FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000096b7840 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020f93fcb CR3: 00000001c72e4000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d55866c0 ffff8801ceecfa80 ffff8801c6838158 ffff88010000001a 0000000000000000 ffff8801c6838168 000000000000003e 0000000000000246 ffff8801d163c500 1ffff10039dd9f56 0000000020f93fcb 0000000020f93fef Call Trace: [] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714 [] do_loop_readv_writev fs/read_write.c:1105 [inline] [] compat_do_readv_writev+0x522/0x760 fs/read_write.c:1099 [] compat_readv+0xe3/0x150 fs/read_write.c:1128 [] do_compat_readv+0xf4/0x1d0 fs/read_write.c:1148 [] C_SYSC_readv fs/read_write.c:1160 [inline] [] compat_SyS_readv+0x26/0x30 fs/read_write.c:1156 [] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline] [] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384 [] entry_SYSENTER_compat+0x74/0x83 arch/x86/entry/entry_64_compat.S:127 Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8a 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 df 05 00 00 48 8b 1b 48 85 db 0f 84 51 03 00 RIP [] sg_read_oxfer drivers/scsi/sg.c:1976 [inline] RIP [] sg_read+0xd0c/0x1440 drivers/scsi/sg.c:520 RSP ---[ end trace d2046fa0c27a026e ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..