Warning: Permanently added '10.128.0.64' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   26.636909][    C0] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580
[   26.639173][    C0] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3030, name: syz-executor282
[   26.641355][    C0] preempt_count: 101, expected: 0
[   26.642476][    C0] RCU nest depth: 0, expected: 0
[   26.643606][    C0] 4 locks held by syz-executor282/3030:
[   26.644854][    C0]  #0: ffff0000cb21f1c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_lock+0x90/0x100
[   26.647039][    C0]  #1: ffff0000cb21f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_hangup+0x168/0x508
[   26.649383][    C0]  #2: ffff0000cb0630b0 (&gsm->mutex){+.+.}-{3:3}, at: gsm_cleanup_mux+0x54/0x3c0
[   26.651542][    C0]  #3: ffff800008003e20 ((&dlci->t1)){+.-.}-{0:0}, at: call_timer_fn+0x54/0x144
[   26.653663][    C0] Preemption disabled at:
[   26.653670][    C0] [<ffff8000096aec50>] klist_next+0x30/0x18c
[   26.656098][    C0] CPU: 0 PID: 3030 Comm: syz-executor282 Not tainted 6.0.0-rc6-syzkaller-17742-gc194837ebb57 #0
[   26.658586][    C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
[   26.661005][    C0] Call trace:
[   26.661790][    C0]  dump_backtrace+0x1c4/0x1f0
[   26.662929][    C0]  show_stack+0x2c/0x54
[   26.663936][    C0]  dump_stack_lvl+0x104/0x16c
[   26.665044][    C0]  dump_stack+0x1c/0x58
[   26.666087][    C0]  __might_resched+0x208/0x218
[   26.667218][    C0]  __might_sleep+0x48/0x78
[   26.668296][    C0]  __mutex_lock_common+0x6c/0xca8
[   26.669513][    C0]  mutex_lock_nested+0x38/0x44
[   26.670631][    C0]  gsm_send+0x1a0/0x260
[   26.671622][    C0]  gsm_dlci_t1+0xa8/0x1e0
[   26.672639][    C0]  call_timer_fn+0x90/0x144
[   26.673697][    C0]  __run_timers+0x280/0x374
[   26.674911][    C0]  run_timer_softirq+0x34/0x5c
[   26.676056][    C0]  _stext+0x168/0x37c
[   26.677013][    C0]  ____do_softirq+0x14/0x20
[   26.678113][    C0]  call_on_irq_stack+0x2c/0x54
[   26.679297][    C0]  do_softirq_own_stack+0x20/0x2c
[   26.680515][    C0]  invoke_softirq+0x70/0xbc
[   26.681571][    C0]  __irq_exit_rcu+0xf0/0x140
[   26.682660][    C0]  irq_exit_rcu+0x10/0x40
[   26.683674][    C0]  el1_interrupt+0x38/0x68
[   26.684724][    C0]  el1h_64_irq_handler+0x18/0x24
[   26.685871][    C0]  el1h_64_irq+0x64/0x68
[   26.687026][    C0]  _raw_spin_unlock_irqrestore+0x58/0x8c
[   26.688392][    C0]  klist_next+0x108/0x18c
[   26.689439][    C0]  class_find_device+0xc0/0x178
[   26.690589][    C0]  device_destroy+0x48/0xdc
[   26.691660][    C0]  tty_unregister_device+0x38/0x88
[   26.693011][    C0]  gsm_cleanup_mux+0x22c/0x3c0
[   26.694136][    C0]  gsmld_close+0x28/0x74
[   26.695149][    C0]  tty_ldisc_hangup+0x358/0x508
[   26.696307][    C0]  __tty_hangup+0x27c/0x47c
[   26.697371][    C0]  tty_vhangup_session+0x24/0x34
[   26.698617][    C0]  disassociate_ctty+0x1d8/0x460
[   26.699808][    C0]  do_exit+0x230/0xbe0
[   26.700779][    C0]  do_group_exit+0x60/0xe8
[   26.701833][    C0]  __wake_up_parent+0x0/0x40
[   26.702901][    C0]  el0_svc_common+0x138/0x220
[   26.704003][    C0]  do_el0_svc+0x48/0x164
[   26.705004][    C0]  el0_svc+0x58/0x150
[   26.705951][    C0]  el0t_64_sync_handler+0x84/0xf0
[   26.707149][    C0]  el0t_64_sync+0x18c/0x190
[   26.708240][    C0] 
[   26.708744][    C0] =============================
[   26.709857][    C0] [ BUG: Invalid wait context ]
[   26.710959][    C0] 6.0.0-rc6-syzkaller-17742-gc194837ebb57 #0 Tainted: G        W         
[   26.712871][    C0] -----------------------------
[   26.713963][    C0] syz-executor282/3030 is trying to lock:
[   26.715280][    C0] ffff0000cb063430 (&gsm->tx_mutex){+.+.}-{3:3}, at: gsm_send+0x1a0/0x260
[   26.717208][    C0] other info that might help us debug this:
[   26.718721][    C0] context-{2:2}
[   26.719535][    C0] 4 locks held by syz-executor282/3030:
[   26.720858][    C0]  #0: ffff0000cb21f1c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_lock+0x90/0x100
[   26.723053][    C0]  #1: ffff0000cb21f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_hangup+0x168/0x508
[   26.725350][    C0]  #2: ffff0000cb0630b0 (&gsm->mutex){+.+.}-{3:3}, at: gsm_cleanup_mux+0x54/0x3c0
[   26.727561][    C0]  #3: ffff800008003e20 ((&dlci->t1)){+.-.}-{0:0}, at: call_timer_fn+0x54/0x144
[   26.729820][    C0] stack backtrace:
[   26.730710][    C0] CPU: 0 PID: 3030 Comm: syz-executor282 Tainted: G        W          6.0.0-rc6-syzkaller-17742-gc194837ebb57 #0
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