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From:   Vishnu Dasa <vdasa@vmware.com>
To:     "Dae R. Jeong" <threeearcat@gmail.com>
CC:     Bryan Tan <bryantan@vmware.com>,
        Pv-drivers <Pv-drivers@vmware.com>,
        "arnd@arndb.de" <arnd@arndb.de>,
        Greg KH <gregkh@linuxfoundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: general protection fault in add_wait_queue_exclusive
Thread-Topic: general protection fault in add_wait_queue_exclusive
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Date:   Wed, 10 Aug 2022 18:00:30 +0000
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Thank you for reporting this.  We have filed an internal bug and will look =
into it.

Regards,
Vishnu

> On Jul 11, 2022, at 3:52 AM, Dae R. Jeong <threeearcat@gmail.com> wrote:
>=20
> Hello,
>=20
> We observed a crash "general protection fault in
> add_wait_queue_exclusive" during fuzzing.
>=20
> Unfortunately, we have not found a reproducer for the crash yet. We
> will inform you if we have any update on this crash.
>=20
>=20
> Detailed crash information is attached at the end of this email.
>=20
> Best regards,
> Dae R. Jeong
> ------
>=20
> - Kernel commit:
> 92f20ff72066d
>=20
> - Crash report:
> general protection fault, probably for non-canonical address 0xdffffc0000=
000019: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
> CPU: 2 PID: 14077 Comm: syz-executor.0 Not tainted 5.19.0-rc3-32288-g0f3b=
08299494 #15
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-=
g155821a1990b-prebuilt.qemu.org 04/01/2014
> RIP: 0010:__lock_acquire+0xf3/0x5e00 kernel/locking/lockdep.c:4926
> Code: 89 bc 24 88 00 00 00 0f 85 02 27 00 00 83 3d 1b 16 66 10 00 0f 84 9=
7 43 00 00 83 3d d6 ea f9 0e 00 74 31 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00=
 74 17 e8 81 63 86 00 48 8b bc 24 88 00 00 00 49 b8
> RSP: 0018:ffffc9000ea575e0 EFLAGS: 00010002
> RAX: 0000000000000019 RBX: 0000000000000001 RCX: 1ffff92001d4aedc
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000c8
> RBP: ffffc9000ea57970 R08: dffffc0000000000 R09: 0000000000000001
> R10: fffffbfff2394d5e R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
> FS:  00007f44e25aa700(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000=
000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000056077effb180 CR3: 0000000028845000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> lock_acquire+0x1a4/0x4a0 kernel/locking/lockdep.c:5672
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:162
> add_wait_queue_exclusive+0x3c/0x130 kernel/sched/wait.c:33
> ep_ptable_queue_proc+0x1b1/0x370 fs/eventpoll.c:1259
> poll_wait include/linux/poll.h:49 [inline]
> vmci_host_poll+0xf8/0x2b0 drivers/misc/vmw_vmci/vmci_host.c:174
> vfs_poll include/linux/poll.h:88 [inline]
> ep_item_poll fs/eventpoll.c:853 [inline]
> ep_insert fs/eventpoll.c:1522 [inline]
> do_epoll_ctl+0x2f84/0x4a90 fs/eventpoll.c:2141
> __do_sys_epoll_ctl fs/eventpoll.c:2192 [inline]
> __se_sys_epoll_ctl fs/eventpoll.c:2183 [inline]
> __x64_sys_epoll_ctl+0x19d/0x230 fs/eventpoll.c:2183
> do_syscall_x64 arch/x86/entry/common.c:51 [inline]
> do_syscall_64+0x4e/0xa0 arch/x86/entry/common.c:82
> entry_SYSCALL_64_after_hwframe+0x46/0xb0
> RIP: 0033:0x478dc9
> Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f=
7 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f44e25a9be8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9
> RAX: ffffffffffffffda RBX: 0000000000781408 RCX: 0000000000478dc9
> RDX: 0000000000000004 RSI: 0000000000000001 RDI: 0000000000000003
> RBP: 00000000f477909a R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000020000240 R11: 0000000000000246 R12: 0000000000781500
> R13: 0000000000781414 R14: 0000000000781408 R15: 00007ffc45fbf120
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:__lock_acquire+0xf3/0x5e00 kernel/locking/lockdep.c:4926
> Code: 89 bc 24 88 00 00 00 0f 85 02 27 00 00 83 3d 1b 16 66 10 00 0f 84 9=
7 43 00 00 83 3d d6 ea f9 0e 00 74 31 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00=
 74 17 e8 81 63 86 00 48 8b bc 24 88 00 00 00 49 b8
> RSP: 0018:ffffc9000ea575e0 EFLAGS: 00010002
> RAX: 0000000000000019 RBX: 0000000000000001 RCX: 1ffff92001d4aedc
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000c8
> RBP: ffffc9000ea57970 R08: dffffc0000000000 R09: 0000000000000001
> R10: fffffbfff2394d5e R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
> FS:  00007f44e25aa700(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000=
000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000056077effb180 CR3: 0000000028845000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400