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KASAN: wild-memory-access Read of size 18

Status: closed as invalid on 2017/10/18 09:01
First crash: 2377d, last: 2377d

Sample crash report:
sg_write: data in/out 2127708969/3 bytes for SCSI command 0xe3-- guessing data in;
   program syz-executor6 not setting count and/or reply_len properly
device gre0 entered promiscuous mode
==================================================================
BUG: KASAN: wild-memory-access on address ffe70874507ab000
Read of size 18 by task syz-executor6/9437
CPU: 0 PID: 9437 Comm: syz-executor6 Not tainted 4.9.54-g34e23de #62
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ccfdf9e8 ffffffff81d93659 ffe70874507ab000 0000000000000012
 0000000000000000 ffff8801d184c420 ffe70874507ab000 ffff8801ccfdfa70
 ffffffff8153d48f 0000000000000000 0000000000000001 ffffffff826651bb
Call Trace:
 [<ffffffff81d93659>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93659>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153d48f>] kasan_report_error mm/kasan/report.c:284 [inline]
 [<ffffffff8153d48f>] kasan_report.part.1+0x40f/0x500 mm/kasan/report.c:309
 [<ffffffff8153d860>] kasan_report+0x20/0x30 mm/kasan/report.c:296
 [<ffffffff8153c1a7>] check_memory_region_inline mm/kasan/kasan.c:308 [inline]
 [<ffffffff8153c1a7>] check_memory_region+0x137/0x190 mm/kasan/kasan.c:315
 [<ffffffff8153c211>] kasan_check_read+0x11/0x20 mm/kasan/kasan.c:320
 [<ffffffff826651bb>] __copy_to_user arch/x86/include/asm/uaccess_64.h:182 [inline]
 [<ffffffff826651bb>] sg_read_oxfer drivers/scsi/sg.c:1978 [inline]
 [<ffffffff826651bb>] sg_read+0x124b/0x1400 drivers/scsi/sg.c:520
 [<ffffffff8156bb41>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156f910>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156f910>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156fbc4>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8156fce6>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff815730a7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff815730a7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838af185>] entry_SYSCALL_64_fastpath+0x23/0xc6
==================================================================
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: 9437 Comm: syz-executor6 Tainted: G    B           4.9.54-g34e23de #62
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c68ec800 task.stack: ffff8801ccfd8000
RIP: 0010:[<ffffffff8144e371>]  [<ffffffff8144e371>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144e371>]  [<ffffffff8144e371>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144e371>]  [<ffffffff8144e371>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144e371>]  [<ffffffff8144e371>] put_page_testzero include/linux/mm.h:445 [inline]
RIP: 0010:[<ffffffff8144e371>]  [<ffffffff8144e371>] __free_pages+0x21/0x80 mm/page_alloc.c:3901
RSP: 0018:ffff8801ccfdfb00  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffc90003279000
RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c
RBP: ffff8801ccfdfb10 R08: ffffed003a309894 R09: 0000000000000000
R10: fffca3b000000000 R11: ffffed003a309894 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801c6ffa100 R15: dffffc0000000000
FS:  00007f2206055700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 00000001c7ed3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 ffff8801c6ffa258 ffff8801ccfdfb70 ffffffff826627b1
 ffff8801c6ffa270 ffffed0038dff44b ffffed0038dff44e ffff8801c6ffa268
 dead4ead00000000 ffff8801c6ffa240 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff826627b1>] sg_remove_scat.isra.20+0x1c1/0x2d0 drivers/scsi/sg.c:1954
 [<ffffffff82662b75>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1836
 [<ffffffff8266488c>] sg_read+0x91c/0x1400 drivers/scsi/sg.c:527
 [<ffffffff8156d753>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156ece7>] vfs_read+0x107/0x330 fs/read_write.c:475
 [<ffffffff815728c9>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff815728c9>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff838af185>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: ff 66 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d 
RIP  [<ffffffff8144e371>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144e371>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144e371>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144e371>] put_page_testzero include/linux/mm.h:445 [inline]
RIP  [<ffffffff8144e371>] __free_pages+0x21/0x80 mm/page_alloc.c:3901
 RSP <ffff8801ccfdfb00>
---[ end trace 4812e555e537cf5b ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/10/12 01:54 https://android.googlesource.com/kernel/common android-4.9 34e23dee72dd c26ea367 .config console log report ci-android-49-kasan-gce
* Struck through repros no longer work on HEAD.