Hello, syzbot found the following issue on: HEAD commit: 808eb958781e Add linux-next specific files for 20250206 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=106cb3df980000 kernel config: https://syzkaller.appspot.com/x/.config?x=88b25e5d30d576e4 dashboard link: https://syzkaller.appspot.com/bug?extid=1eaee1ec18b9d18ca3b8 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=12736df8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1043a4a4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/493ef93f2e5f/disk-808eb958.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b41757cd41c9/vmlinux-808eb958.xz kernel image: https://storage.googleapis.com/syzbot-assets/24f456104aad/bzImage-808eb958.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=17aea1b0580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=146ea1b0580000 console output: https://syzkaller.appspot.com/x/log.txt?x=106ea1b0580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1eaee1ec18b9d18ca3b8@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: c411c62cc133 ("Bluetooth: hci_uart: fix race during initialization") RBP: 00007f95dbd414c0 R08: 00007fffc17488e7 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00007f95dbd415b0 R13: 00007fffc1748b60 R14: 00007f95dbd448e1 R15: 00007f95dbd41518 </TASK> Bluetooth: Can't allocate HCI device Oops: general protection fault, probably for non-canonical address 0xdffffc0000000067: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000338-0x000000000000033f] CPU: 1 UID: 0 PID: 5832 Comm: syz-executor371 Not tainted 6.14.0-rc1-next-20250206-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:__lock_acquire+0x6a/0x2100 kernel/locking/lockdep.c:5091 Code: b6 04 30 84 c0 0f 85 f8 16 00 00 45 31 f6 83 3d 2b ef 80 0e 00 0f 84 c8 13 00 00 89 54 24 60 89 5c 24 38 4c 89 f8 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 ff e8 18 6e 8b 00 48 be 00 00 00 00 00 fc RSP: 0018:ffffc90003e2f6d0 EFLAGS: 00010002 RAX: 0000000000000067 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000338 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001 R10: dffffc0000000000 R11: fffffbfff203744f R12: ffff88807b490000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000338 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f95dbd12930 CR3: 000000000e738000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __timer_delete_sync+0x148/0x310 kernel/time/timer.c:1644 del_timer_sync include/linux/timer.h:185 [inline] h5_close+0x4b/0x170 drivers/bluetooth/hci_h5.c:257 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:464 task_work_run+0x24f/0x310 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2a/0x2860 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+0x26c3/0x26d0 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: 0033:0x7f95dbcfdb69 Code: Unable to access opcode bytes at 0x7f95dbcfdb3f. RSP: 002b:00007fffc1748ae8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f95dbcfdb69 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 RBP: 00007f95dbd72370 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00007f95dbd72370 R13: 0000000000000000 R14: 00007f95dbd72dc0 R15: 00007f95dbcc7480 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0x6a/0x2100 kernel/locking/lockdep.c:5091 Code: b6 04 30 84 c0 0f 85 f8 16 00 00 45 31 f6 83 3d 2b ef 80 0e 00 0f 84 c8 13 00 00 89 54 24 60 89 5c 24 38 4c 89 f8 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 ff e8 18 6e 8b 00 48 be 00 00 00 00 00 fc RSP: 0018:ffffc90003e2f6d0 EFLAGS: 00010002 RAX: 0000000000000067 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000338 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001 R10: dffffc0000000000 R11: fffffbfff203744f R12: ffff88807b490000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000338 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f95dbd12930 CR3: 000000000e738000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: b6 04 mov $0x4,%dh 2: 30 84 c0 0f 85 f8 16 xor %al,0x16f8850f(%rax,%rax,8) 9: 00 00 add %al,(%rax) b: 45 31 f6 xor %r14d,%r14d e: 83 3d 2b ef 80 0e 00 cmpl $0x0,0xe80ef2b(%rip) # 0xe80ef40 15: 0f 84 c8 13 00 00 je 0x13e3 1b: 89 54 24 60 mov %edx,0x60(%rsp) 1f: 89 5c 24 38 mov %ebx,0x38(%rsp) 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 30 00 cmpb $0x0,(%rax,%rsi,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 4c 89 ff mov %r15,%rdi 33: e8 18 6e 8b 00 call 0x8b6e50 38: 48 rex.W 39: be 00 00 00 00 mov $0x0,%esi 3e: 00 fc add %bh,%ah --- 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
