BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 8367, name: syz-executor.3 preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 3 locks held by syz-executor.3/8367: #0: ffff0000c8edb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff0000c8edb130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:954 [inline] #1: ffff0000c8edb130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: iterate_tty_write drivers/tty/tty_io.c:973 [inline] #1: ffff0000c8edb130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x188/0x7a4 drivers/tty/tty_io.c:1096 #2: ffff0000d133a3e0 (&gsm->tx_lock){....}-{2:2}, at: gsmld_write+0x60/0x154 drivers/tty/n_gsm.c:3721 irq event stamp: 856 hardirqs last enabled at (855): [] ___slab_alloc+0x5dc/0xeb0 mm/slub.c:3450 hardirqs last disabled at (856): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (856): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (846): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (844): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 Preemption disabled at: [] gsmld_write+0x60/0x154 drivers/tty/n_gsm.c:3721 CPU: 0 PID: 8367 Comm: syz-executor.3 Not tainted 6.9.0-rc7-syzkaller-gfda5695d692c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 dump_stack+0x1c/0x28 lib/dump_stack.c:123 __might_resched+0x374/0x4d0 kernel/sched/core.c:10197 __might_sleep+0x90/0xe4 kernel/sched/core.c:10126 console_lock+0x38/0x204 kernel/printk/printk.c:2659 do_con_write+0x130/0x3d28 drivers/tty/vt/vt.c:3056 con_write+0x34/0x58 drivers/tty/vt/vt.c:3434 gsmld_write+0x104/0x154 drivers/tty/n_gsm.c:3724 iterate_tty_write drivers/tty/tty_io.c:1021 [inline] file_tty_write+0x410/0x7a4 drivers/tty/tty_io.c:1096 tty_write+0x48/0x58 drivers/tty/tty_io.c:1117 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x968/0xc3c fs/read_write.c:590 ksys_write+0x15c/0x26c fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:652 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 BUG: scheduling while atomic: syz-executor.3/8367/0x00000002 3 locks held by syz-executor.3/8367: #0: ffff0000c8edb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff0000c8edb130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:954 [inline] #1: ffff0000c8edb130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: iterate_tty_write drivers/tty/tty_io.c:973 [inline] #1: ffff0000c8edb130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x188/0x7a4 drivers/tty/tty_io.c:1096 #2: ffff0000d133a3e0 (&gsm->tx_lock){+.+.}-{2:2}, at: gsmld_write+0x60/0x154 drivers/tty/n_gsm.c:3721 Modules linked in: Preemption disabled at: [] gsmld_write+0x60/0x154 drivers/tty/n_gsm.c:3721 CPU: 0 PID: 8367 Comm: syz-executor.3 Tainted: G W 6.9.0-rc7-syzkaller-gfda5695d692c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 dump_stack+0x1c/0x28 lib/dump_stack.c:123 __schedule_bug+0x10c/0x19c kernel/sched/core.c:5952 schedule_debug kernel/sched/core.c:5979 [inline] __schedule+0x1568/0x24e8 kernel/sched/core.c:6629 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6838 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2558 ___down_common+0x2a4/0x4f0 kernel/locking/semaphore.c:225 __down_common+0xc4/0x47c kernel/locking/semaphore.c:246 __down+0x18/0x24 kernel/locking/semaphore.c:254 down+0x94/0xe8 kernel/locking/semaphore.c:63 console_lock+0x17c/0x204 kernel/printk/printk.c:2665 do_con_write+0x130/0x3d28 drivers/tty/vt/vt.c:3056 con_write+0x34/0x58 drivers/tty/vt/vt.c:3434 gsmld_write+0x104/0x154 drivers/tty/n_gsm.c:3724 iterate_tty_write drivers/tty/tty_io.c:1021 [inline] file_tty_write+0x410/0x7a4 drivers/tty/tty_io.c:1096 tty_write+0x48/0x58 drivers/tty/tty_io.c:1117 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x968/0xc3c fs/read_write.c:590 ksys_write+0x15c/0x26c fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:652 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(val > preempt_count()) WARNING: CPU: 0 PID: 8367 at kernel/sched/core.c:5898 preempt_count_sub+0x11c/0x2d8 kernel/sched/core.c:5898 Modules linked in: CPU: 0 PID: 8367 Comm: syz-executor.3 Tainted: G W 6.9.0-rc7-syzkaller-gfda5695d692c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : preempt_count_sub+0x11c/0x2d8 kernel/sched/core.c:5898 lr : preempt_count_sub+0x11c/0x2d8 kernel/sched/core.c:5898 sp : ffff800099cd7990 x29: ffff800099cd79b0 x28: ffff0000d5bd3c80 x27: ffff0000c8edb648 x26: 1fffe000191db6c9 x25: dfff800000000000 x24: ffff80008bf68c18 x23: ffff0000c8edb000 x22: ffff0000cd400000 x21: 0000000000000089 x20: ffff0000d133a3c8 x19: 0000000000000000 x18: 1fffe000367b8996 x17: ffff80008eead000 x16: ffff80008ae88870 x15: 0000000000000001 x14: 1fffe000367bb590 x13: 0000000000000000 x12: 0000000000000000 x11: ffff800099ccffff x10: 0000000000ff0100 x9 : 8f63ccc8e61f8100 x8 : 8f63ccc8e61f8100 x7 : 1fffe000367b8997 x6 : ffff8000802aa2c0 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000d5bd3c80 x1 : 0000000000000000 x0 : ffff8000802aa360 Call trace: preempt_count_sub+0x11c/0x2d8 kernel/sched/core.c:5898 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x4c/0x98 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] gsmld_write+0x114/0x154 drivers/tty/n_gsm.c:3727 iterate_tty_write drivers/tty/tty_io.c:1021 [inline] file_tty_write+0x410/0x7a4 drivers/tty/tty_io.c:1096 tty_write+0x48/0x58 drivers/tty/tty_io.c:1117 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x968/0xc3c fs/read_write.c:590 ksys_write+0x15c/0x26c fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:652 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 1129 hardirqs last enabled at (1129): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (1129): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (1128): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (1128): [] _raw_spin_lock_irq+0x28/0x70 kernel/locking/spinlock.c:170 softirqs last enabled at (978): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (978): [] handle_softirqs+0xa60/0xc34 kernel/softirq.c:582 softirqs last disabled at (859): [] __do_softirq+0x14/0x20 kernel/softirq.c:588 ---[ end trace 0000000000000000 ]---