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@xxxxxxxxxxxxxxxxxxxxxxxxx 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.
