Re: [syzbot] [bluetooth?] BUG: sleeping function called from invalid context in lock_sock_nested (3)

[syzbot <syzbot+55cd5225f71c5cff7f6f@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    6c0483dbfe72 Merge tag 'nfsd-6.10-3' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=166dd081980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=67463c0717b8d4ca
dashboard link: https://syzkaller.appspot.com/bug?extid=55cd5225f71c5cff7f6f
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=134b8f89980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15373b8e980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c089ba9c9453/disk-6c0483db.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3a8f5c77bdcc/vmlinux-6c0483db.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bfd6a6716dea/bzImage-6c0483db.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+55cd5225f71c5cff7f6f@syzkaller.appspotmail.com

BUG: sleeping function called from invalid context at net/core/sock.c:3536
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5090, name: kworker/u9:2
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
6 locks held by kworker/u9:2/5090:
 #0: ffff88802e05a148 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 #0: ffff88802e05a148 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: ffffc9000351fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
 #1: ffffc9000351fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: ffff8880214bc078 (&hdev->lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0xb1/0xaa0 net/bluetooth/hci_event.c:4926
 #3: ffffffff8f73f388 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1967 [inline]
 #3: ffffffff8f73f388 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x532/0xaa0 net/bluetooth/hci_event.c:5009
 #4: ffff8880122c1220 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #4: ffff8880122c1220 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1277 [inline]
 #4: ffff8880122c1220 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x28a/0xb40 net/bluetooth/sco.c:1362
 #5: ffff88802bc87258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1602 [inline]
 #5: ffff88802bc87258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1290 [inline]
 #5: ffff88802bc87258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x461/0xb40 net/bluetooth/sco.c:1362
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 5090 Comm: kworker/u9:2 Not tainted 6.10.0-rc5-syzkaller-00243-g6c0483dbfe72 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 __might_resched+0x5d4/0x780 kernel/sched/core.c:10196
 lock_sock_nested+0x5d/0x100 net/core/sock.c:3536
 lock_sock include/net/sock.h:1602 [inline]
 sco_conn_ready net/bluetooth/sco.c:1290 [inline]
 sco_connect_cfm+0x461/0xb40 net/bluetooth/sco.c:1362
 hci_connect_cfm include/net/bluetooth/hci_core.h:1970 [inline]
 hci_sync_conn_complete_evt+0x5ab/0xaa0 net/bluetooth/hci_event.c:5009
 hci_event_func net/bluetooth/hci_event.c:7417 [inline]
 hci_event_packet+0xac0/0x1540 net/bluetooth/hci_event.c:7469
 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4074
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


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