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charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: c8bc81a52d5a Merge tag 'arm64-fixes' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1508ce34580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bd9738e00c1bbfb4 dashboard link: https://syzkaller.appspot.com/bug?extid=535bbe83dfc3ae8d4be3 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11019a62580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1308ce34580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e617000fa273/disk-c8bc81a5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7ae3a3f4924d/vmlinux-c8bc81a5.xz kernel image: https://storage.googleapis.com/syzbot-assets/d68d297e1f87/bzImage-c8bc81a5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+535bbe83dfc3ae8d4be3@syzkaller.appspotmail.com Bluetooth: hci0: Opcode 0x0c1a failed: -110 Bluetooth: hci0: Error when powering off device on rfkill (-110) ------------[ cut here ]------------ rtmutex deadlock detected WARNING: CPU: 0 PID: 6084 at kernel/locking/rtmutex.c:1674 rt_mutex_handle_deadlock+0x28/0xb0 kernel/locking/rtmutex.c:1674 Modules linked in: CPU: 0 UID: 0 PID: 6084 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:rt_mutex_handle_deadlock+0x28/0xb0 kernel/locking/rtmutex.c:1674 Code: 90 90 41 57 41 56 41 55 41 54 53 83 ff dd 0f 85 8c 00 00 00 48 89 f7 e8 c6 2c 01 00 90 48 c7 c7 80 08 0b 8b e8 79 78 8a f6 90 <0f> 0b 90 90 4c 8d 3d 00 00 00 00 65 48 8b 1c 25 08 e0 f5 91 4c 8d RSP: 0018:ffffc90003a8f950 EFLAGS: 00010246 RAX: 4a17b3cdcfcd8c00 RBX: ffffc90003a8f9e0 RCX: ffff888034b23b80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003a8fb00 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1017104863 R12: 1ffff92000751f38 R13: ffffffff8af8b119 R14: ffff88802b77f098 R15: dffffc0000000000 FS: 00007f918c68e6c0(0000) GS:ffff8881268c2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558db6b05168 CR3: 0000000040f42000 CR4: 00000000003526f0 Call Trace: __rt_mutex_slowlock kernel/locking/rtmutex.c:1734 [inline] __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline] rt_mutex_slowlock+0x692/0x6e0 kernel/locking/rtmutex.c:1800 __rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline] __mutex_lock_common kernel/locking/rtmutex_api.c:536 [inline] mutex_lock_nested+0x16a/0x1d0 kernel/locking/rtmutex_api.c:547 device_lock include/linux/device.h:911 [inline] nfc_dev_down net/nfc/core.c:143 [inline] nfc_rfkill_set_block+0x50/0x2e0 net/nfc/core.c:179 rfkill_set_block+0x1e5/0x450 net/rfkill/core.c:346 rfkill_fop_write+0x44e/0x580 net/rfkill/core.c:1301 vfs_write+0x284/0xb40 fs/read_write.c:684 ksys_write+0x14b/0x260 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f918d01ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f918c68e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f918d255fa0 RCX: 00007f918d01ebe9 RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000004 RBP: 00007f918d0a1e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f918d256038 R14: 00007f918d255fa0 R15: 00007ffcb32fa318 --- 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.