Hello, syzbot found the following issue on: HEAD commit: 40b8e93e17bf Add linux-next specific files for 20250204 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1102a3df980000 kernel config: https://syzkaller.appspot.com/x/.config?x=ec880188a87c6aad dashboard link: https://syzkaller.appspot.com/bug?extid=b9cff96f1ca33356d180 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=177d5d18580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17d078a4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ccdfef06f59f/disk-40b8e93e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b339eaf8dcfd/vmlinux-40b8e93e.xz kernel image: https://storage.googleapis.com/syzbot-assets/ae1a0f1c3c80/bzImage-40b8e93e.xz The issue was bisected to: commit c411c62cc13319533b1861e00cedc4883c3bc1bb Author: Arseniy Krasnov <avkrasnov@xxxxxxxxxxxxxxxxx> Date: Thu Jan 30 18:43:26 2025 +0000 Bluetooth: hci_uart: fix race during initialization bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16b1c4a4580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=15b1c4a4580000 console output: https://syzkaller.appspot.com/x/log.txt?x=11b1c4a4580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b9cff96f1ca33356d180@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: c411c62cc133 ("Bluetooth: hci_uart: fix race during initialization") Oops: general protection fault, probably for non-canonical address 0xdffffc000000002b: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000158-0x000000000000015f] CPU: 1 UID: 0 PID: 5837 Comm: syz-executor233 Not tainted 6.14.0-rc1-next-20250204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:serial_clock_vote drivers/bluetooth/hci_qca.c:301 [inline] RIP: 0010:qca_close+0x72/0x2e0 drivers/bluetooth/hci_qca.c:723 Code: 64 af f6 f8 48 89 2c 24 42 80 7c 2d 00 00 74 08 4c 89 f7 e8 20 28 5d f9 4d 8b 26 49 8d bc 24 5a 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 4c 89 eb 0f 85 de 01 00 00 45 0f b6 ac 24 5a RSP: 0018:ffffc90003cb79f0 EFLAGS: 00010206 RAX: 000000000000002b RBX: ffff888012bb2400 RCX: ffff88802e269e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000015a RBP: 1ffff110025764b7 R08: ffffffff8187d8b3 R09: 1ffffffff2860723 R10: dffffc0000000000 R11: ffffffff88c8a130 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888012bb25b8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb3e1c10d0 CR3: 000000000e738000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> hci_uart_tty_close+0x205/0x290 drivers/bluetooth/hci_ldisc.c:557 tty_ldisc_kill+0xa3/0x1a0 drivers/tty/tty_ldisc.c:613 tty_ldisc_release+0x1a1/0x200 drivers/tty/tty_ldisc.c:781 tty_release_struct+0x2b/0xe0 drivers/tty/tty_io.c:1690 tty_release+0xd06/0x12c0 drivers/tty/tty_io.c:1861 __fput+0x3e9/0x9f0 fs/file_table.c:448 task_work_run+0x24f/0x310 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbb3e145c79 Code: Unable to access opcode bytes at 0x7fbb3e145c4f. RSP: 002b:00007ffe5ba71518 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbb3e145c79 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fbb3e1c0270 R08: ffffffffffffffb8 R09: 00007ffe5ba71738 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbb3e1c0270 R13: 0000000000000000 R14: 00007fbb3e1c0cc0 R15: 00007fbb3e117a60 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:serial_clock_vote drivers/bluetooth/hci_qca.c:301 [inline] RIP: 0010:qca_close+0x72/0x2e0 drivers/bluetooth/hci_qca.c:723 Code: 64 af f6 f8 48 89 2c 24 42 80 7c 2d 00 00 74 08 4c 89 f7 e8 20 28 5d f9 4d 8b 26 49 8d bc 24 5a 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 4c 89 eb 0f 85 de 01 00 00 45 0f b6 ac 24 5a RSP: 0018:ffffc90003cb79f0 EFLAGS: 00010206 RAX: 000000000000002b RBX: ffff888012bb2400 RCX: ffff88802e269e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000015a RBP: 1ffff110025764b7 R08: ffffffff8187d8b3 R09: 1ffffffff2860723 R10: dffffc0000000000 R11: ffffffff88c8a130 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888012bb25b8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb3e1c10d0 CR3: 000000000e738000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 64 af fs scas %es:(%rdi),%eax 2: f6 f8 idiv %al 4: 48 89 2c 24 mov %rbp,(%rsp) 8: 42 80 7c 2d 00 00 cmpb $0x0,0x0(%rbp,%r13,1) e: 74 08 je 0x18 10: 4c 89 f7 mov %r14,%rdi 13: e8 20 28 5d f9 call 0xf95d2838 18: 4d 8b 26 mov (%r14),%r12 1b: 49 8d bc 24 5a 01 00 lea 0x15a(%r12),%rdi 22: 00 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 4c 89 eb mov %r13,%rbx 34: 0f 85 de 01 00 00 jne 0x218 3a: 45 rex.RB 3b: 0f .byte 0xf 3c: b6 ac mov $0xac,%dh 3e: 24 5a and $0x5a,%al --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
