Messages in this thread | | | Date | Wed, 02 Oct 2019 12:56:12 -0700 | Subject | KMSAN: uninit-value in read_rio | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 1e76a3e5 kmsan: replace __GFP_NO_KMSAN_SHADOW with kmsan_i.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=13806633600000 kernel config: https://syzkaller.appspot.com/x/.config?x=f03c659d0830ab8d dashboard link: https://syzkaller.appspot.com/bug?extid=a3b2314912629b97f231 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a3b2314912629b97f231@syzkaller.appspotmail.com
usb 5-1: Rio opened. ===================================================== BUG: KMSAN: uninit-value in __vfs_read+0x1a9/0xc90 fs/read_write.c:425 CPU: 1 PID: 12169 Comm: syz-executor.4 Not tainted 5.3.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250 read_rio+0x55d/0x860 drivers/usb/misc/rio500.c:404 __vfs_read+0x1a9/0xc90 fs/read_write.c:425 vfs_read+0x359/0x6f0 fs/read_write.c:461 ksys_read+0x265/0x430 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read+0x92/0xb0 fs/read_write.c:595 __x64_sys_read+0x4a/0x70 fs/read_write.c:595 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x459a29 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd0a6183c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a29 RDX: 0000000000000009 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd0a61846d4 R13: 00000000004c7066 R14: 00000000004dc8c8 R15: 00000000ffffffff
Local variable description: ----partial@read_rio Variable was created at: read_rio+0xff/0x860 drivers/usb/misc/rio500.c:360 __vfs_read+0x1a9/0xc90 fs/read_write.c:425 =====================================================
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