linux-kernel - general protection fault in add_wait

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Date:   Mon, 20 Jun 2022 23:13:09 +0900
From:   "Dae R. Jeong" <threeearcat@...il.com>
To:     bryantan@...are.com, rjalisatgi@...are.com, vdasa@...are.com,
        pv-drivers@...are.com, arnd@...db.de, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: general protection fault in add_wait_queue

Hi,

We observed a crash "general protection fault in add_wait_queue"
during fuzzing. 

Unfortunately, we have not found a reproducer for the crash yet. We
will inform you if we have any update on this crash.

Detailed crash information is as follows.
------

- Kernel commit:
b13baccc3850ca

- Crash report: 
general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 2 PID: 27483 Comm: syz-executor.0 Not tainted 5.19.0-rc1-31595-gdf1bbda1a939 #13
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 9b 05 66 10 00 0f 84 97 43 00 00 83 3d 46 ea f9 0e 00 74 31 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 17 e8 b1 5e 86 00 48 8b bc 24 88 00 00 00 49 b8
RSP: 0018:ffffc900082af260 EFLAGS: 00010002
RAX: 0000000000000019 RBX: 0000000000000001 RCX: 1ffff92001055e6c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000c8
RBP: ffffc900082af5f0 R08: dffffc0000000000 R09: 0000000000000001
R10: fffffbfff2394b3e R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f36801c0700(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fdf32207d0 CR3: 000000005af57000 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/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:162
 add_wait_queue+0x3d/0x260 kernel/sched/wait.c:22
 poll_wait include/poll.h:49 [inline]
 vmci_host_poll+0xf8/0x2b0 drivers/misc/vmw_vmci/vmci_host.c:174
 vfs_poll include/poll.h:88 [inline]
 do_pollfd fs/select.c:873 [inline]
 do_poll fs/select.c:921 [inline]
 do_sys_poll+0xc7c/0x1aa0 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1121 [inline]
 __se_sys_ppoll+0x2cc/0x330 fs/select.c:1101
 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: 0033:0x478db9
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f36801bfbe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 0000000000781408 RCX: 0000000000478db9
RDX: 00000000200000c0 RSI: 0000000000000001 RDI: 0000000020000100
RBP: 00000000f477909a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000007815c0
R13: 0000000000781414 R14: 0000000000781408 R15: 00007fffb85f7830
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0xf3/0x5e00 kernel/locking/lockdep.c:4926
RSP: 0018:ffffc900082af260 EFLAGS: 00010002
RAX: 0000000000000019 RBX: 0000000000000001 RCX: 1ffff92001055e6c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000c8
RBP: ffffc900082af5f0 R08: dffffc0000000000 R09: 0000000000000001
R10: fffffbfff2394b3e R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f36801c0700(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fdf32207d0 CR3: 000000005af57000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400