RBP: 00007f407da9d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe731ef97f R14: 00007f407da9d300 R15: 0000000000022000
======================================================
WARNING: possible circular locking dependency detected
5.10.56 #1 Not tainted
------------------------------------------------------
syz-executor.4/9258 is trying to acquire lock:
ffffffff84d0a8a0 (console_owner){-.-.}-{0:0}, at: console_unlock+0x2e1/0xb30 kernel/printk/printk.c:2498

but task is already holding lock:
ffff888021e77958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&port->lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159
       tty_port_tty_get+0x1f/0x100 drivers/tty/tty_port.c:288
       tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:47
       serial8250_tx_chars+0x516/0xb40 drivers/tty/serial/8250/8250_port.c:1844
       serial8250_handle_irq.part.0+0x3f1/0x4c0 drivers/tty/serial/8250/8250_port.c:1931
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1904 [inline]
       serial8250_default_handle_irq+0xb8/0x230 drivers/tty/serial/8250/8250_port.c:1947
       serial8250_interrupt+0xf4/0x1a0 drivers/tty/serial/8250/8250_core.c:126
       __handle_irq_event_percpu+0x2ef/0x820 kernel/irq/handle.c:156
       handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
       handle_irq_event+0x102/0x290 kernel/irq/handle.c:213
       handle_edge_irq+0x249/0xd00 kernel/irq/chip.c:819
       asm_call_irq_on_stack+0x12/0x20
       __run_irq_on_irqstack arch/x86/include/asm/irq_stack.h:48 [inline]
       run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:101 [inline]
       handle_irq arch/x86/kernel/irq.c:230 [inline]
       __common_interrupt arch/x86/kernel/irq.c:249 [inline]
       common_interrupt+0xdd/0x190 arch/x86/kernel/irq.c:239
       asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:626
       native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
       arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
       default_idle+0xe/0x10 arch/x86/kernel/process.c:688
       default_idle_call+0x87/0xd0 kernel/sched/idle.c:112
       cpuidle_idle_call kernel/sched/idle.c:194 [inline]
       do_idle+0x3a9/0x520 kernel/sched/idle.c:300
       cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396
       secondary_startup_64_no_verify+0xc2/0xcb

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159
       serial8250_console_write+0x8dd/0xb20 drivers/tty/serial/8250/8250_port.c:3317
       call_console_drivers kernel/printk/printk.c:1909 [inline]
       console_unlock+0x826/0xb30 kernel/printk/printk.c:2523
       register_console kernel/printk/printk.c:2864 [inline]
       register_console+0x53d/0x800 kernel/printk/printk.c:2754
       univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:690
       console_init+0x361/0x4fa kernel/printk/printk.c:2974
       start_kernel+0x2f2/0x49b init/main.c:984
       secondary_startup_64_no_verify+0xc2/0xcb

-> #0 (console_owner){-.-.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:2985 [inline]
       check_prevs_add kernel/locking/lockdep.c:3110 [inline]
       validate_chain kernel/locking/lockdep.c:3725 [inline]
       __lock_acquire+0x29f6/0x5b20 kernel/locking/lockdep.c:4950
       lock_acquire kernel/locking/lockdep.c:5560 [inline]
       lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5525
       console_lock_spinning_enable kernel/printk/printk.c:1761 [inline]
       console_unlock+0x360/0xb30 kernel/printk/printk.c:2520
       vprintk_emit+0x1da/0x4d0 kernel/printk/printk.c:2052
       vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401
       printk+0xba/0xed kernel/printk/printk.c:2100
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail+0x472/0x5a0 lib/fault-inject.c:146
       should_failslab+0x5/0x10 mm/slab_common.c:1193
       slab_pre_alloc_hook mm/slab.h:515 [inline]
       slab_alloc_node mm/slub.c:2814 [inline]
       slab_alloc mm/slub.c:2897 [inline]
       __kmalloc+0x72/0x3e0 mm/slub.c:3958
       kmalloc include/linux/slab.h:557 [inline]
       tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:175
       __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:273
       tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:318
       tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
       pty_write+0x126/0x1f0 drivers/tty/pty.c:122
       tty_put_char+0x129/0x150 drivers/tty/tty_io.c:3123
       __process_echoes+0x588/0x9f0 drivers/tty/n_tty.c:724
       process_echoes+0xf9/0x1c0 drivers/tty/n_tty.c:806
       n_tty_set_termios+0x720/0x1010 drivers/tty/n_tty.c:1865
       tty_set_termios+0x5f1/0x840 drivers/tty/tty_ioctl.c:341
       set_termios.part.0+0x2c4/0x4d0 drivers/tty/tty_ioctl.c:414
       set_termios drivers/tty/tty_ioctl.c:368 [inline]
       tty_mode_ioctl+0x573/0xf10 drivers/tty/tty_ioctl.c:704
       n_tty_ioctl_helper+0x55/0x3a0 drivers/tty/tty_ioctl.c:883
       n_tty_ioctl+0x56/0x370 drivers/tty/n_tty.c:2482
       tty_ioctl+0x8ba/0x17c0 drivers/tty/tty_io.c:2751
       vfs_ioctl fs/ioctl.c:48 [inline]
       __do_sys_ioctl fs/ioctl.c:753 [inline]
       __se_sys_ioctl fs/ioctl.c:739 [inline]
       __x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
       do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

other info that might help us debug this:

Chain exists of:
  console_owner --> &port_lock_key --> &port->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&port->lock);
                               lock(&port_lock_key);
                               lock(&port->lock);
  lock(console_owner);

 *** DEADLOCK ***

6 locks held by syz-executor.4/9258:
 #0: ffff8880485a8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266
 #1: ffff8880485ac2e8 (&o_tty->termios_rwsem/1){++++}-{3:3}, at: tty_set_termios+0xec/0x840 drivers/tty/tty_ioctl.c:328
 #2: ffff8880485ac098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1d/0x80 drivers/tty/tty_ldisc.c:287
 #3: ffffc9001398b378 (&ldata->output_lock){+.+.}-{3:3}, at: process_echoes+0xaf/0x1c0 drivers/tty/n_tty.c:804
 #4: ffff888021e77958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120
 #5: ffffffff84deac20 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401

stack backtrace:
CPU: 0 PID: 9258 Comm: syz-executor.4 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2120
 check_prev_add kernel/locking/lockdep.c:2985 [inline]
 check_prevs_add kernel/locking/lockdep.c:3110 [inline]
 validate_chain kernel/locking/lockdep.c:3725 [inline]
 __lock_acquire+0x29f6/0x5b20 kernel/locking/lockdep.c:4950
 lock_acquire kernel/locking/lockdep.c:5560 [inline]
 lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5525
 console_lock_spinning_enable kernel/printk/printk.c:1761 [inline]
 console_unlock+0x360/0xb30 kernel/printk/printk.c:2520
 vprintk_emit+0x1da/0x4d0 kernel/printk/printk.c:2052
 vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401
 printk+0xba/0xed kernel/printk/printk.c:2100
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail+0x472/0x5a0 lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2814 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 __kmalloc+0x72/0x3e0 mm/slub.c:3958
 kmalloc include/linux/slab.h:557 [inline]
 tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:175
 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:273
 tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:318
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x126/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x129/0x150 drivers/tty/tty_io.c:3123
 __process_echoes+0x588/0x9f0 drivers/tty/n_tty.c:724
 process_echoes+0xf9/0x1c0 drivers/tty/n_tty.c:806
 n_tty_set_termios+0x720/0x1010 drivers/tty/n_tty.c:1865
 tty_set_termios+0x5f1/0x840 drivers/tty/tty_ioctl.c:341
 set_termios.part.0+0x2c4/0x4d0 drivers/tty/tty_ioctl.c:414
 set_termios drivers/tty/tty_ioctl.c:368 [inline]
 tty_mode_ioctl+0x573/0xf10 drivers/tty/tty_ioctl.c:704
 n_tty_ioctl_helper+0x55/0x3a0 drivers/tty/tty_ioctl.c:883
 n_tty_ioctl+0x56/0x370 drivers/tty/n_tty.c:2482
 tty_ioctl+0x8ba/0x17c0 drivers/tty/tty_io.c:2751
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f407da9d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000020000080 RSI: 0000000000005402 RDI: 0000000000000003
RBP: 00007f407da9d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe731ef97f R14: 00007f407da9d300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 9272 Comm: syz-executor.0 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2814 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 __kmalloc+0x72/0x3e0 mm/slub.c:3958
 kmalloc include/linux/slab.h:557 [inline]
 tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:175
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:273
 tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:318
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x126/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x129/0x150 drivers/tty/tty_io.c:3123
 __process_echoes+0x588/0x9f0 drivers/tty/n_tty.c:724
 process_echoes+0xf9/0x1c0 drivers/tty/n_tty.c:806
 n_tty_set_termios+0x720/0x1010 drivers/tty/n_tty.c:1865
 tty_set_termios+0x5f1/0x840 drivers/tty/tty_ioctl.c:341
 set_termios.part.0+0x2c4/0x4d0 drivers/tty/tty_ioctl.c:414
 set_termios drivers/tty/tty_ioctl.c:368 [inline]
 tty_mode_ioctl+0x573/0xf10 drivers/tty/tty_ioctl.c:704
 n_tty_ioctl_helper+0x55/0x3a0 drivers/tty/tty_ioctl.c:883
 n_tty_ioctl+0x56/0x370 drivers/tty/n_tty.c:2482
 tty_ioctl+0x8ba/0x17c0 drivers/tty/tty_io.c:2751
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f37e0d58188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 0000000000466609
RDX: 0000000020000080 RSI: 0000000000005402 RDI: 0000000000000004
RBP: 00007f37e0d581d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff33bc9bff R14: 00007f37e0d58300 R15: 0000000000022000
CPU: 0 PID: 9277 Comm: syz-executor.2 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 _copy_to_user+0x2e/0x180 lib/usercopy.c:29
 copy_to_user include/linux/uaccess.h:200 [inline]
 simple_read_from_buffer+0xcc/0x160 fs/libfs.c:729
 proc_fail_nth_read+0x194/0x220 fs/proc/base.c:1423
 vfs_read+0x228/0x580 fs/read_write.c:494
 ksys_read+0x12d/0x250 fs/read_write.c:634
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x41935c
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48
RSP: 002b:00007f455db28170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000041935c
RDX: 000000000000000f RSI: 00007f455db281e0 RDI: 0000000000000004
RBP: 00007f455db281d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdd421fd5f R14: 00007f455db28300 R15: 0000000000022000
EXT4-fs (loop7): mounting ext2 file system using the ext4 subsystem
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 9268 Comm: syz-executor.6 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 copyin lib/iov_iter.c:155 [inline]
 _copy_from_iter+0x202/0xd40 lib/iov_iter.c:774
 copy_from_iter include/linux/uio.h:146 [inline]
 do_tty_write drivers/tty/tty_io.c:1025 [inline]
 file_tty_write.constprop.0+0x4a4/0x8d0 drivers/tty/tty_io.c:1118
 call_write_iter include/linux/fs.h:1903 [inline]
 new_sync_write+0x42c/0x660 fs/read_write.c:518
 vfs_write+0x743/0xa20 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f03c629e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000000000120 RSI: 0000000020000640 RDI: 0000000000000005
RBP: 00007f03c629e1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff54b32a2f R14: 00007f03c629e300 R15: 0000000000022000
EXT4-fs (loop7): mounted filesystem without journal. Opts: ,errors=continue
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 9296 Comm: syz-executor.0 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2814 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 kmem_cache_alloc+0x5b/0x350 mm/slub.c:2902
 mem_pool_alloc mm/kmemleak.c:423 [inline]
 create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578
 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
 slab_post_alloc_hook mm/slab.h:534 [inline]
 slab_alloc_node mm/slub.c:2889 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 __kmalloc+0x16e/0x3e0 mm/slub.c:3958
 kmalloc include/linux/slab.h:557 [inline]
 tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:175
 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:273
 tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:318
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x126/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x129/0x150 drivers/tty/tty_io.c:3123
 __process_echoes+0x588/0x9f0 drivers/tty/n_tty.c:724
 process_echoes+0xf9/0x1c0 drivers/tty/n_tty.c:806
 n_tty_set_termios+0x720/0x1010 drivers/tty/n_tty.c:1865
 tty_set_termios+0x5f1/0x840 drivers/tty/tty_ioctl.c:341
EXT4-fs (loop7): mounting ext2 file system using the ext4 subsystem
 set_termios.part.0+0x2c4/0x4d0 drivers/tty/tty_ioctl.c:414
 set_termios drivers/tty/tty_ioctl.c:368 [inline]
 tty_mode_ioctl+0x573/0xf10 drivers/tty/tty_ioctl.c:704
 n_tty_ioctl_helper+0x55/0x3a0 drivers/tty/tty_ioctl.c:883
 n_tty_ioctl+0x56/0x370 drivers/tty/n_tty.c:2482
 tty_ioctl+0x8ba/0x17c0 drivers/tty/tty_io.c:2751
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f37e0d79188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000020000080 RSI: 0000000000005402 RDI: 0000000000000004
RBP: 00007f37e0d791d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff33bc9bff R14: 00007f37e0d79300 R15: 0000000000022000
EXT4-fs (loop7): mounted filesystem without journal. Opts: ,errors=continue
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 9322 Comm: syz-executor.4 Not tainted 5.10.56 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1193
 slab_pre_alloc_hook mm/slab.h:515 [inline]
 slab_alloc_node mm/slub.c:2814 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 kmem_cache_alloc+0x5b/0x350 mm/slub.c:2902
 mem_pool_alloc mm/kmemleak.c:423 [inline]
 create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:578
 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
 slab_post_alloc_hook mm/slab.h:534 [inline]
 slab_alloc_node mm/slub.c:2889 [inline]
 slab_alloc mm/slub.c:2897 [inline]
 __kmalloc+0x16e/0x3e0 mm/slub.c:3958
 kmalloc include/linux/slab.h:557 [inline]
 tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:175
 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:273
EXT4-fs (loop7): mounting ext2 file system using the ext4 subsystem
 tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:318
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x126/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x129/0x150 drivers/tty/tty_io.c:3123
 __process_echoes+0x588/0x9f0 drivers/tty/n_tty.c:724
 process_echoes+0xf9/0x1c0 drivers/tty/n_tty.c:806
 n_tty_set_termios+0x720/0x1010 drivers/tty/n_tty.c:1865
 tty_set_termios+0x5f1/0x840 drivers/tty/tty_ioctl.c:341
 set_termios.part.0+0x2c4/0x4d0 drivers/tty/tty_ioctl.c:414
 set_termios drivers/tty/tty_ioctl.c:368 [inline]
 tty_mode_ioctl+0x573/0xf10 drivers/tty/tty_ioctl.c:704
 n_tty_ioctl_helper+0x55/0x3a0 drivers/tty/tty_ioctl.c:883
 n_tty_ioctl+0x56/0x370 drivers/tty/n_tty.c:2482
 tty_ioctl+0x8ba/0x17c0 drivers/tty/tty_io.c:2751
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f407da9d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000020000080 RSI: 0000000000005402 RDI: 0000000000000003
RBP: 00007f407da9d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe731ef97f R14: 00007f407da9d300 R15: 0000000000022000
EXT4-fs (loop7): mounted filesystem without journal. Opts: ,errors=continue