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Date: Sat, 22 Jul 2023 05:16:21 -0700
From: syzbot <syzbot+837b8c9032c053262db8@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, jirislaby@...nel.org,
linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [serial?] general protection fault in serial8250_tx_chars
syzbot has found a reproducer for the following issue on:
HEAD commit: d192f5382581 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12d03ff4a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=a4507c291b5ab5d4
dashboard link: https://syzkaller.appspot.com/bug?extid=837b8c9032c053262db8
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e4fe52a80000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/517e5a5be15c/disk-d192f538.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/59d41b43c30c/vmlinux-d192f538.xz
kernel image: https://storage.googleapis.com/syzbot-assets/99ed26179ccf/bzImage-d192f538.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+837b8c9032c053262db8@...kaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5137 Comm: kworker/0:4 Not tainted 6.5.0-rc2-syzkaller-00307-gd192f5382581 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Workqueue: pm pm_runtime_work
RIP: 0010:serial8250_tx_chars+0x299/0x8b0 drivers/tty/serial/8250/8250_port.c:1813
Code: 8d cc 25 fd 48 8b 2b 48 8b 44 24 20 42 0f b6 04 38 84 c0 0f 85 8f 02 00 00 48 8b 04 24 48 63 00 48 01 c5 48 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 91 02 00 00 0f b6 6d 00 48 8b 44 24 60
RSP: 0018:ffffc9000432f8b0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88801f490fd0 RCX: 1ffffffff246641b
RDX: 1ffffffff2466465 RSI: 0000000000000000 RDI: ffffffff92332330
RBP: 0000000000000000 R08: ffffffff84bef450 R09: fffff52000865f10
R10: dffffc0000000000 R11: fffff52000865f10 R12: 0000000000000010
R13: ffffffff92332180 R14: ffffffff92332080 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555c2f938 CR3: 000000002b259000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__start_tx+0x312/0x450 drivers/tty/serial/8250/8250_port.c:1547
serial_port_runtime_resume+0x1ec/0x2a0 drivers/tty/serial/serial_port.c:40
__rpm_callback+0x2b9/0x7a0 drivers/base/power/runtime.c:392
rpm_callback drivers/base/power/runtime.c:446 [inline]
rpm_resume+0x10b1/0x1af0 drivers/base/power/runtime.c:912
pm_runtime_work+0x147/0x210 drivers/base/power/runtime.c:977
process_one_work+0x92c/0x12c0 kernel/workqueue.c:2597
worker_thread+0xa63/0x1210 kernel/workqueue.c:2748
kthread+0x2b8/0x350 kernel/kthread.c:389
ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
RIP: 0000:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:serial8250_tx_chars+0x299/0x8b0 drivers/tty/serial/8250/8250_port.c:1813
Code: 8d cc 25 fd 48 8b 2b 48 8b 44 24 20 42 0f b6 04 38 84 c0 0f 85 8f 02 00 00 48 8b 04 24 48 63 00 48 01 c5 48 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 91 02 00 00 0f b6 6d 00 48 8b 44 24 60
RSP: 0018:ffffc9000432f8b0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88801f490fd0 RCX: 1ffffffff246641b
RDX: 1ffffffff2466465 RSI: 0000000000000000 RDI: ffffffff92332330
RBP: 0000000000000000 R08: ffffffff84bef450 R09: fffff52000865f10
R10: dffffc0000000000 R11: fffff52000865f10 R12: 0000000000000010
R13: ffffffff92332180 R14: ffffffff92332080 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000002b259000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: cc int3
1: 25 fd 48 8b 2b and $0x2b8b48fd,%eax
6: 48 8b 44 24 20 mov 0x20(%rsp),%rax
b: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax
10: 84 c0 test %al,%al
12: 0f 85 8f 02 00 00 jne 0x2a7
18: 48 8b 04 24 mov (%rsp),%rax
1c: 48 63 00 movslq (%rax),%rax
1f: 48 01 c5 add %rax,%rbp
22: 48 89 e8 mov %rbp,%rax
25: 48 c1 e8 03 shr $0x3,%rax
* 29: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 91 02 00 00 jne 0x2c7
36: 0f b6 6d 00 movzbl 0x0(%rbp),%ebp
3a: 48 8b 44 24 60 mov 0x60(%rsp),%rax
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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