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Date: Sun, 17 Dec 2017 01:56:01 -0800 From: syzbot <bot+dcff49641d63583853a5806197d79145931ac740@...kaller.appspotmail.com> To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, pbonzini@...hat.com, rkrcmar@...hat.com, syzkaller-bugs@...glegroups.com Subject: BUG: unable to handle kernel NULL pointer dereference in irq_bypass_register_consumer Hello, syzkaller hit the following crash on 41d8c16909ebda40f7b4982a7f5e2ad102705ade git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master compiler: gcc (GCC) 7.1.1 20170620 .config is attached Raw console output is attached. syzkaller reproducer is attached. See https://goo.gl/kgGztJ for information about syzkaller reproducers BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 IP: irq_bypass_register_consumer+0xbe/0x200 virt/lib/irqbypass.c:198 PGD 20d26c067 P4D 20d26c067 PUD 20d26f067 PMD 0 Oops: 0000 [#1] SMP Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 8627 Comm: syz-executor7 Not tainted 4.15.0-rc3-next-20171213+ #66 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:irq_bypass_register_consumer+0xbe/0x200 virt/lib/irqbypass.c:198 RSP: 0018:ffffc9000691fd50 EFLAGS: 00010293 RAX: ffff88021431e2c0 RBX: 0000000000000000 RCX: ffffffff825a774e RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000691fd70 R08: ffffffff825a7710 R09: 0000000000000004 R10: ffffc9000691fd40 R11: 0000000000000004 R12: ffff88020d3d5368 R13: ffff88020ef7c980 R14: ffff88020eef2768 R15: ffff88020d370000 FS: 00007f2d09cf8700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 00000002143f1000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kvm_irqfd_assign arch/x86/kvm/../../../virt/kvm/eventfd.c:417 [inline] kvm_irqfd+0x6d4/0x860 arch/x86/kvm/../../../virt/kvm/eventfd.c:572 kvm_vm_ioctl+0x3e2/0x9f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3000 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0xaf/0x840 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452a39 RSP: 002b:00007f2d09cf7c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39 RDX: 0000000020080fe0 RSI: 000000004020ae76 RDI: 0000000000000003 RBP: 0000000000000562 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f61d0 R13: 00000000ffffffff R14: 00007f2d09cf86d4 R15: 0000000000000000 Code: d1 fe 4d 8b 6c 24 10 4d 39 6e 10 74 2f 4d 39 f4 74 2a 4c 89 f3 e8 33 2c d1 fe 48 8b 1b 48 81 fb 60 e1 19 83 74 43 e8 22 2c d1 fe <4c> 39 6b 10 0f 94 c2 49 39 dc 0f 94 c0 08 c2 74 d9 e8 0c 2c d1 RIP: irq_bypass_register_consumer+0xbe/0x200 virt/lib/irqbypass.c:198 RSP: ffffc9000691fd50 CR2: 0000000000000010 ---[ end trace 28b4667ba051ea9a ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@...glegroups.com. Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com> syzbot will keep track of this bug report. Once a fix for this bug is merged into any tree, reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body. View attachment "config.txt" of type "text/plain" (126475 bytes) Download attachment "raw.log" of type "application/octet-stream" (4982 bytes) View attachment "repro.txt" of type "text/plain" (1802 bytes)
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