On Sat, Jul 10, 2021 at 03:58:10PM -0700, syzbot wrote:
> Hello,
>
> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> BUG: sleeping function called from invalid context in lock_sock_nested
This is clearly a different bug, so it looks like the patch does fix
the original bug. I'll submit it after the end of the merge window.
Alan Stern
> BUG: sleeping function called from invalid context at net/core/sock.c:3159
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 8829, name: syz-executor.5
> 1 lock held by syz-executor.5/8829:
> #0: ffffffff8d2ecee0 (hci_sk_list.lock){++++}-{2:2}, at: hci_sock_dev_event+0x3db/0x660 net/bluetooth/hci_sock.c:763
> Preemption disabled at:
> [<0000000000000000>] 0x0
> CPU: 1 PID: 8829 Comm: syz-executor.5 Not tainted 5.13.0-next-20210707-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
> ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9171
> lock_sock_nested+0x25/0x120 net/core/sock.c:3159
> lock_sock include/net/sock.h:1613 [inline]
> hci_sock_dev_event+0x465/0x660 net/bluetooth/hci_sock.c:765
> hci_unregister_dev+0x2fd/0x1130 net/bluetooth/hci_core.c:4033
> vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340
> __fput+0x288/0x920 fs/file_table.c:280
> task_work_run+0xdd/0x1a0 kernel/task_work.c:164
> exit_task_work include/linux/task_work.h:32 [inline]
> do_exit+0xbd4/0x2a60 kernel/exit.c:825
> do_group_exit+0x125/0x310 kernel/exit.c:922
> __do_sys_exit_group kernel/exit.c:933 [inline]
> __se_sys_exit_group kernel/exit.c:931 [inline]
> __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x4665d9
> Code: Unable to access opcode bytes at RIP 0x4665af.
> RSP: 002b:00007ffd31aadb08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
> RAX: ffffffffffffffda RBX: 00007ffd31aae2c8 RCX: 00000000004665d9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
> RBP: 0000000000000000 R08: 0000000000000025 R09: 00007ffd31aae2c8
> R10: 00000000ffffffff R11: 0000000000000246 R12: 00000000004bef54
> R13: 0000000000000010 R14: 0000000000000000 R15: 0000000000400538
>
> ======================================================
>
>
> Tested on:
>
> commit: ee268dee Add linux-next specific files for 20210707
> git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> console output: https://syzkaller.appspot.com/x/log.txt?x=159cf1e2300000
> kernel config: https://syzkaller.appspot.com/x/.config?x=59e1e3bbc3afca75
> dashboard link: https://syzkaller.appspot.com/bug?extid=72af3105289dcb4c055b
> compiler:
> patch: https://syzkaller.appspot.com/x/patch.diff?x=163fd772300000
