bisecting fixing commit since 4d552acf337038028f7e2f63a927afb7adf65fc1
building syzkaller on 13030ef80c19571b552c1aacd01b3b4d1f4075bf
testing commit 4d552acf337038028f7e2f63a927afb7adf65fc1
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 8f7f02a82acf34bb611e18836caff1044c4aac46b9869d94115eb523ce306d51
run #0: crashed: possible deadlock in pty_write
run #1: crashed: possible deadlock in console_unlock
run #2: crashed: possible deadlock in pty_write
run #3: crashed: possible deadlock in pty_write
run #4: crashed: possible deadlock in pty_write
run #5: crashed: possible deadlock in pty_write
run #6: crashed: possible deadlock in pty_write
run #7: crashed: possible deadlock in console_unlock
run #8: crashed: possible deadlock in console_unlock
run #9: crashed: possible deadlock in console_unlock
run #10: crashed: possible deadlock in console_unlock
run #11: crashed: possible deadlock in console_unlock
run #12: crashed: possible deadlock in pty_write
run #13: crashed: possible deadlock in console_unlock
run #14: crashed: possible deadlock in console_unlock
run #15: crashed: possible deadlock in console_unlock
run #16: crashed: possible deadlock in console_unlock
run #17: crashed: possible deadlock in console_unlock
run #18: crashed: possible deadlock in pty_write
run #19: crashed: possible deadlock in console_unlock
testing current HEAD 2950c9c5e0df6bd34af45a5168bbee345e95eae2
testing commit 2950c9c5e0df6bd34af45a5168bbee345e95eae2
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: d95219dd7b22ec469542061be922127e48be556538e253842b3aa72c13afc6d4
run #0: crashed: possible deadlock in pty_write
run #1: crashed: possible deadlock in console_unlock
run #2: crashed: possible deadlock in pty_write
run #3: crashed: possible deadlock in pty_write
run #4: crashed: possible deadlock in console_unlock
run #5: crashed: possible deadlock in pty_write
run #6: crashed: possible deadlock in pty_write
run #7: crashed: possible deadlock in pty_write
run #8: crashed: possible deadlock in pty_write
run #9: crashed: possible deadlock in console_unlock
revisions tested: 2, total time: 25m57.531476482s (build: 18m12.853018258s, test: 6m51.784267677s)
the crash still happens on HEAD
commit msg: Linux 4.19.207
crash: possible deadlock in console_unlock
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f0783ccd6bc
======================================================
WARNING: possible circular locking dependency detected
4.19.207-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/6536 is trying to acquire lock:
000000003f32ecb8 (console_owner){-...}, at: log_next kernel/printk/printk.c:507 [inline]
000000003f32ecb8 (console_owner){-...}, at: console_unlock+0x386/0xdf0 kernel/printk/printk.c:2447

but task is already holding lock:
0000000080297407 (&(&port->lock)->rlock){-.-.}, at: pty_write+0xbf/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)->rlock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
       tty_port_tty_get+0x1b/0x70 drivers/tty/tty_port.c:289
       tty_port_default_wakeup+0xa/0x30 drivers/tty/tty_port.c:47
       tty_port_tty_wakeup+0x58/0x70 drivers/tty/tty_port.c:391
       uart_write_wakeup+0x37/0x50 drivers/tty/serial/serial_core.c:103
       serial8250_tx_chars+0x3eb/0xb70 drivers/tty/serial/8250/8250_port.c:1813
       serial8250_handle_irq.part.23+0x229/0x2e0 drivers/tty/serial/8250/8250_port.c:1900
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1873 [inline]
       serial8250_default_handle_irq+0x82/0xe0 drivers/tty/serial/8250/8250_port.c:1916
       serial8250_interrupt+0xd8/0x170 drivers/tty/serial/8250/8250_core.c:125
       __handle_irq_event_percpu+0x102/0x660 kernel/irq/handle.c:149
       handle_irq_event_percpu+0x6c/0x140 kernel/irq/handle.c:189
       handle_irq_event+0xa2/0x130 kernel/irq/handle.c:206
       handle_edge_irq+0x20b/0x790 kernel/irq/chip.c:800
       generic_handle_irq_desc include/linux/irqdesc.h:155 [inline]
       handle_irq+0x231/0x3a0 arch/x86/kernel/irq_64.c:87
       do_IRQ+0x98/0x1d0 arch/x86/kernel/irq.c:246
       ret_from_intr+0x0/0x1e
       arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
       _raw_spin_unlock_irqrestore+0xaf/0xd0 kernel/locking/spinlock.c:184
       spin_unlock_irqrestore include/linux/spinlock.h:384 [inline]
       uart_write+0x37a/0x6a0 drivers/tty/serial/serial_core.c:612
       do_output_char+0x4f3/0x710 drivers/tty/n_tty.c:445
       process_output drivers/tty/n_tty.c:512 [inline]
       n_tty_write+0x536/0x1070 drivers/tty/n_tty.c:2343
       do_tty_write drivers/tty/tty_io.c:960 [inline]
       tty_write+0x349/0x770 drivers/tty/tty_io.c:1044
       redirected_tty_write+0xa5/0xc0 drivers/tty/tty_io.c:1065
       do_loop_readv_writev fs/read_write.c:704 [inline]
       do_loop_readv_writev fs/read_write.c:688 [inline]
       do_iter_write fs/read_write.c:962 [inline]
       do_iter_write+0x36a/0x540 fs/read_write.c:941
       vfs_writev+0x16f/0x2d0 fs/read_write.c:1005
       do_writev+0x110/0x330 fs/read_write.c:1040
       __do_sys_writev fs/read_write.c:1113 [inline]
       __se_sys_writev fs/read_write.c:1110 [inline]
       __x64_sys_writev+0x70/0xb0 fs/read_write.c:1110
       do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (&port_lock_key){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
       serial8250_console_write+0x6a3/0x860 drivers/tty/serial/8250/8250_port.c:3290
       univ8250_console_write+0x4e/0x70 drivers/tty/serial/8250/8250_core.c:589
       call_console_drivers kernel/printk/printk.c:1764 [inline]
       console_unlock+0x8c1/0xdf0 kernel/printk/printk.c:2460
       vprintk_emit+0x191/0x540 kernel/printk/printk.c:1965
       vprintk_default+0x1a/0x20 kernel/printk/printk.c:2007
       vprintk_func+0x49/0x130 kernel/printk/printk_safe.c:405
       printk+0x9a/0xc0 kernel/printk/printk.c:2040
       register_console+0x61b/0xa20 kernel/printk/printk.c:2776
       univ8250_console_init+0x1e/0x28 drivers/tty/serial/8250/8250_core.c:684
       console_init+0x317/0x481 kernel/printk/printk.c:2862
       start_kernel+0x4b6/0x62f init/main.c:659
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:490
       x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:471
       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #0 (console_owner){-...}:
       lock_acquire+0x173/0x3d0 kernel/locking/lockdep.c:3908
       console_lock_spinning_enable kernel/printk/printk.c:1627 [inline]
       console_unlock+0x3e8/0xdf0 kernel/printk/printk.c:2457
       vprintk_emit+0x191/0x540 kernel/printk/printk.c:1965
       vprintk_default+0x1a/0x20 kernel/printk/printk.c:2007
       vprintk_func+0x49/0x130 kernel/printk/printk_safe.c:405
       printk+0x9a/0xc0 kernel/printk/printk.c:2040
       fail_dump lib/fault-inject.c:44 [inline]
       should_fail+0x551/0x690 lib/fault-inject.c:149
       __should_failslab+0xba/0xf0 mm/failslab.c:32
       should_failslab+0x9/0x20 mm/slab_common.c:1590
       slab_pre_alloc_hook mm/slab.h:424 [inline]
       slab_alloc mm/slab.c:3383 [inline]
       __do_kmalloc mm/slab.c:3725 [inline]
       __kmalloc+0x70/0x770 mm/slab.c:3736
       kmalloc include/linux/slab.h:520 [inline]
       tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
       __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
       tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
       tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
       tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
       pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
       tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
       __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
       flush_echoes drivers/tty/n_tty.c:827 [inline]
       __receive_buf drivers/tty/n_tty.c:1646 [inline]
       n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
       n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
       tiocsti drivers/tty/tty_io.c:2193 [inline]
       tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
       vfs_ioctl fs/ioctl.c:46 [inline]
       file_ioctl fs/ioctl.c:501 [inline]
       do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
       ksys_ioctl+0x62/0x90 fs/ioctl.c:705
       __do_sys_ioctl fs/ioctl.c:712 [inline]
       __se_sys_ioctl fs/ioctl.c:710 [inline]
       __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
       do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  console_owner --> &port_lock_key --> &(&port->lock)->rlock

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

6 locks held by syz-executor.1/6536:
 #0: 000000004a863208 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362
 #1: 000000002427be7c (&port->buf.lock/1){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61
 #2: 00000000953b0371 (&o_tty->termios_rwsem/1){++++}, at: n_tty_receive_buf_common+0x80/0x2bd0 drivers/tty/n_tty.c:1703
 #3: 00000000d5bde3e2 (&ldata->output_lock){+.+.}, at: flush_echoes drivers/tty/n_tty.c:825 [inline]
 #3: 00000000d5bde3e2 (&ldata->output_lock){+.+.}, at: __receive_buf drivers/tty/n_tty.c:1646 [inline]
 #3: 00000000d5bde3e2 (&ldata->output_lock){+.+.}, at: n_tty_receive_buf_common+0x740/0x2bd0 drivers/tty/n_tty.c:1740
 #4: 0000000080297407 (&(&port->lock)->rlock){-.-.}, at: pty_write+0xbf/0x1f0 drivers/tty/pty.c:120
 #5: 00000000f2d86c3d (console_lock){+.+.}, at: console_trylock_spinning kernel/printk/printk.c:1689 [inline]
 #5: 00000000f2d86c3d (console_lock){+.+.}, at: vprintk_emit+0x184/0x540 kernel/printk/printk.c:1964

stack backtrace:
CPU: 1 PID: 6536 Comm: syz-executor.1 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 print_circular_bug.isra.34.cold.55+0x1bd/0x27d kernel/locking/lockdep.c:1222
 check_prev_add kernel/locking/lockdep.c:1866 [inline]
 check_prevs_add kernel/locking/lockdep.c:1979 [inline]
 validate_chain kernel/locking/lockdep.c:2420 [inline]
 __lock_acquire+0x30bb/0x4950 kernel/locking/lockdep.c:3416
 lock_acquire+0x173/0x3d0 kernel/locking/lockdep.c:3908
 console_lock_spinning_enable kernel/printk/printk.c:1627 [inline]
 console_unlock+0x3e8/0xdf0 kernel/printk/printk.c:2457
 vprintk_emit+0x191/0x540 kernel/printk/printk.c:1965
 vprintk_default+0x1a/0x20 kernel/printk/printk.c:2007
 vprintk_func+0x49/0x130 kernel/printk/printk_safe.c:405
 printk+0x9a/0xc0 kernel/printk/printk.c:2040
 fail_dump lib/fault-inject.c:44 [inline]
 should_fail+0x551/0x690 lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f0783ccd198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f0783ccd6bc
8021q: adding VLAN 0 to HW filter on device batadv0
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 6581 Comm: syz-executor.2 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f170276b198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f170276b6bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 6756 Comm: syz-executor.4 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f903c5f0198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f903c5f06bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 6891 Comm: syz-executor.0 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007fef755ec198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007fef755ec6bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 7014 Comm: syz-executor.1 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f0783ccd198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f0783ccd6bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 7057 Comm: syz-executor.5 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007ff321925198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007ff3219256bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 7090 Comm: syz-executor.2 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f170276b198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f170276b6bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 7137 Comm: syz-executor.3 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f1513688198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f15136886bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 7267 Comm: syz-executor.4 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f903c5f0198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f903c5f06bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 7292 Comm: syz-executor.2 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f170276b198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f170276b6bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 7419 Comm: syz-executor.4 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f903c5f0198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f903c5f06bc
CPU: 1 PID: 7429 Comm: syz-executor.0 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007fef755ec198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007fef755ec6bc
CPU: 0 PID: 7433 Comm: syz-executor.2 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f170276b198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f170276b6bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 7474 Comm: syz-executor.4 Not tainted 4.19.207-syzkaller #0
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f903c5f0198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f903c5f06bc
CPU: 1 PID: 7464 Comm: syz-executor.5 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007ff321925198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007ff3219256bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 7571 Comm: syz-executor.5 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007ff321925198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007ff3219256bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 7613 Comm: syz-executor.2 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f170276b198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f170276b6bc
CPU: 0 PID: 7618 Comm: syz-executor.0 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007fef755ec198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007fef755ec6bc
CPU: 1 PID: 7623 Comm: syz-executor.4 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f903c5f0198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f903c5f06bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 7689 Comm: syz-executor.4 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f903c5f0198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f903c5f06bc
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 7813 Comm: syz-executor.0 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007fef755ec198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007fef755ec6bc
CPU: 1 PID: 7827 Comm: syz-executor.3 Not tainted 4.19.207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0x5/0xa lib/fault-inject.c:149
 __should_failslab+0xba/0xf0 mm/failslab.c:32
 should_failslab+0x9/0x20 mm/slab_common.c:1590
 slab_pre_alloc_hook mm/slab.h:424 [inline]
 slab_alloc mm/slab.c:3383 [inline]
 __do_kmalloc mm/slab.c:3725 [inline]
 __kmalloc+0x70/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x1b3/0x550 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag drivers/tty/tty_buffer.c:313 [inline]
 tty_insert_flip_string_fixed_flag+0x78/0x200 drivers/tty/tty_buffer.c:306
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xf3/0x1f0 drivers/tty/pty.c:122
 tty_put_char+0x10d/0x130 drivers/tty/tty_io.c:2893
 __process_echoes+0x311/0x790 drivers/tty/n_tty.c:726
 flush_echoes drivers/tty/n_tty.c:827 [inline]
 __receive_buf drivers/tty/n_tty.c:1646 [inline]
 n_tty_receive_buf_common+0x780/0x2bd0 drivers/tty/n_tty.c:1740
 n_tty_receive_buf+0xc/0x10 drivers/tty/n_tty.c:1769
 tiocsti drivers/tty/tty_io.c:2193 [inline]
 tty_ioctl+0x67d/0x1310 drivers/tty/tty_io.c:2580
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x199/0x10d0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4603b9
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:00007f1513688198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 00000000004603b9
RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 0000000000000003 R14: 00000000004ae6a9 R15: 00007f15136886bc