possible deadlock in console

[upstream] possible deadlock in console_unlock
Status: upstream: reported C repro on 2018/06/06 13:17
Reported-by: syzbot+43e93968b964e369db0b@syzkaller.appspotmail.com
First: 164d, last: 2h27m

duplicates:
Title	Repro	Count	Last	Reported	Patched	Status
possible deadlock in vprintk_emit	C	322	4h55m	162d		closed as dup on 2018/06/08 07:50

Sample crash report:

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3350380d80 R14: 0000000000000004 R15: 6d74702f7665642f
CPU: 1 PID: 4456 Comm: syz-executor589 Not tainted 4.17.0+ #87

======================================================
WARNING: possible circular locking dependency detected
4.17.0+ #87 Not tainted
------------------------------------------------------
syz-executor589/4455 is trying to acquire lock:
        (ptrval) (console_owner){-...}, at: log_next kernel/printk/printk.c:496 [inline]
        (ptrval) (console_owner){-...}, at: console_unlock+0x583/0x1100 kernel/printk/printk.c:2382

but task is already holding lock:
        (ptrval) (&(&port->lock)->rlock){-.-.}, at: pty_write+0xf9/0x1f0 drivers/tty/pty.c:119

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+0x96/0xc0 kernel/locking/spinlock.c:152
       tty_port_tty_get+0x20/0x80 drivers/tty/tty_port.c:288
       tty_port_default_wakeup+0x15/0x40 drivers/tty/tty_port.c:47
       tty_port_tty_wakeup+0x5d/0x70 drivers/tty/tty_port.c:390
       uart_write_wakeup+0x44/0x60 drivers/tty/serial/serial_core.c:103
       serial8250_tx_chars+0x4be/0xb60 drivers/tty/serial/8250/8250_port.c:1808
       serial8250_handle_irq.part.25+0x1ee/0x280 drivers/tty/serial/8250/8250_port.c:1881
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1867 [inline]
       serial8250_default_handle_irq+0xc8/0x150 drivers/tty/serial/8250/8250_port.c:1897
       serial8250_interrupt+0xfa/0x1d0 drivers/tty/serial/8250/8250_core.c:125
       __handle_irq_event_percpu+0x1c0/0xad0 kernel/irq/handle.c:149
       handle_irq_event_percpu+0x98/0x1c0 kernel/irq/handle.c:189
       handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206
       handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791
       generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
       handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77
       do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
       ret_from_intr+0x0/0x1e
       arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
       _raw_spin_unlock_irqrestore+0xa1/0xc0 kernel/locking/spinlock.c:184
       spin_unlock_irqrestore include/linux/spinlock.h:365 [inline]
       uart_write+0x3df/0x620 drivers/tty/serial/serial_core.c:591
       process_output_block drivers/tty/n_tty.c:579 [inline]
       n_tty_write+0x6b9/0x1180 drivers/tty/n_tty.c:2308
       do_tty_write drivers/tty/tty_io.c:958 [inline]
       tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
       redirected_tty_write+0xaf/0xc0 drivers/tty/tty_io.c:1063
       __vfs_write+0x10b/0x960 fs/read_write.c:485
       vfs_write+0x1f8/0x560 fs/read_write.c:549
       ksys_write+0xf9/0x250 fs/read_write.c:598
       __do_sys_write fs/read_write.c:610 [inline]
       __se_sys_write fs/read_write.c:607 [inline]
       __x64_sys_write+0x73/0xb0 fs/read_write.c:607
       do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
       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+0x96/0xc0 kernel/locking/spinlock.c:152
       serial8250_console_write+0x8d5/0xb00 drivers/tty/serial/8250/8250_port.c:3230
       univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590
       call_console_drivers kernel/printk/printk.c:1718 [inline]
       console_unlock+0xac2/0x1100 kernel/printk/printk.c:2395
       vprintk_emit+0x6ad/0xdd0 kernel/printk/printk.c:1907
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
       vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
       printk+0x9e/0xba kernel/printk/printk.c:1980
       register_console+0x7e7/0xc00 kernel/printk/printk.c:2714
       univ8250_console_init+0x3f/0x4b drivers/tty/serial/8250/8250_core.c:685
       console_init+0x6d9/0xa38 kernel/printk/printk.c:2798
       start_kernel+0x608/0x92d init/main.c:661
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452
       x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433
       secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242

-> #0 (console_owner){-...}:
       lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3924
       console_lock_spinning_enable kernel/printk/printk.c:1581 [inline]
       console_unlock+0x5ef/0x1100 kernel/printk/printk.c:2392
       vprintk_emit+0x6ad/0xdd0 kernel/printk/printk.c:1907
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
       vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
       printk+0x9e/0xba kernel/printk/printk.c:1980
       fail_dump lib/fault-inject.c:44 [inline]
       should_fail+0x97a/0xbcd lib/fault-inject.c:149
       __should_failslab+0x124/0x180 mm/failslab.c:32
       should_failslab+0x9/0x14 mm/slab_common.c:1522
       slab_pre_alloc_hook mm/slab.h:423 [inline]
       slab_alloc mm/slab.c:3378 [inline]
       __do_kmalloc mm/slab.c:3716 [inline]
       __kmalloc+0x63/0x760 mm/slab.c:3727
       kmalloc include/linux/slab.h:517 [inline]
       tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
       __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
       tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
       tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
       pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
       n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
       do_tty_write drivers/tty/tty_io.c:958 [inline]
       tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
       do_loop_readv_writev fs/read_write.c:703 [inline]
       do_iter_write+0x491/0x5f0 fs/read_write.c:961
       vfs_writev+0x1c7/0x330 fs/read_write.c:1004
       do_writev+0x112/0x2f0 fs/read_write.c:1039
       __do_sys_writev fs/read_write.c:1112 [inline]
       __se_sys_writev fs/read_write.c:1109 [inline]
       __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
       do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
       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-executor589/4455:
 #0:         (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:         (ptrval) (&tty->atomic_write_lock){+.+.}, at: tty_write_lock+0x57/0x90 drivers/tty/tty_io.c:887
 #2:         (ptrval) (&tty->termios_rwsem){++++}, at: n_tty_write+0x25a/0x1180 drivers/tty/n_tty.c:2291
 #3:         (ptrval) (&ldata->output_lock){+.+.}, at: n_tty_write+0xc05/0x1180 drivers/tty/n_tty.c:2330
 #4:         (ptrval) (&(&port->lock)->rlock){-.-.}, at: pty_write+0xf9/0x1f0 drivers/tty/pty.c:119
 #5:         (ptrval) (console_lock){+.+.}, at: console_trylock_spinning kernel/printk/printk.c:1643 [inline]
 #5:         (ptrval) (console_lock){+.+.}, at: vprintk_emit+0x694/0xdd0 kernel/printk/printk.c:1906

stack backtrace:
CPU: 0 PID: 4455 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 print_circular_bug.isra.36.cold.56+0x1bd/0x27d kernel/locking/lockdep.c:1227
 check_prev_add kernel/locking/lockdep.c:1867 [inline]
 check_prevs_add kernel/locking/lockdep.c:1980 [inline]
 validate_chain kernel/locking/lockdep.c:2421 [inline]
 __lock_acquire+0x343e/0x5140 kernel/locking/lockdep.c:3435
 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3924
 console_lock_spinning_enable kernel/printk/printk.c:1581 [inline]
 console_unlock+0x5ef/0x1100 kernel/printk/printk.c:2392
 vprintk_emit+0x6ad/0xdd0 kernel/printk/printk.c:1907
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
 printk+0x9e/0xba kernel/printk/printk.c:1980
 fail_dump lib/fault-inject.c:44 [inline]
 should_fail+0x97a/0xbcd lib/fault-inject.c:149
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f3350380d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbc3c RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000003
RBP: 00000000006dbc38 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3350380d80 R14: 0000000000000004 R15: 6d74702f7665642f
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f335035fd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbc54 RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000005
RBP: 00000000006dbc50 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f335035fd80 R14: 0000000000000006 R15: 6d74702f7665642f
CPU: 0 PID: 4457 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f335033ed78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbc6c RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000007
RBP: 00000000006dbc68 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f335033ed80 R14: 0000000000000008 R15: 6d74702f7665642f
CPU: 1 PID: 4458 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f335031dd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbc84 RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000009
RBP: 00000000006dbc80 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f335031dd80 R14: 000000000000000a R15: 6d74702f7665642f
CPU: 0 PID: 4459 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f33502fcd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbc9c RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 000000000000000b
RBP: 00000000006dbc98 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f33502fcd80 R14: 000000000000000c R15: 6d74702f7665642f
CPU: 1 PID: 4460 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f33502dbd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbcb4 RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 000000000000000d
RBP: 00000000006dbcb0 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f33502dbd80 R14: 000000000000000e R15: 6d74702f7665642f
CPU: 0 PID: 4461 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f33502bad78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbccc RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 000000000000000f
RBP: 00000000006dbcc8 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f33502bad80 R14: 0000000000000010 R15: 6d74702f7665642f
CPU: 1 PID: 4462 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f3350299d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbce4 RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000011
RBP: 00000000006dbce0 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3350299d80 R14: 0000000000000012 R15: 6d74702f7665642f
CPU: 0 PID: 4463 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f3350278d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbcfc RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000013
RBP: 00000000006dbcf8 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3350278d80 R14: 0000000000000014 R15: 6d74702f7665642f
CPU: 1 PID: 4464 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f3350257d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbd14 RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000015
RBP: 00000000006dbd10 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3350257d80 R14: 0000000000000016 R15: 6d74702f7665642f
CPU: 0 PID: 4465 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f3350236d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbd2c RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000017
RBP: 00000000006dbd28 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3350236d80 R14: 0000000000000018 R15: 6d74702f7665642f
CPU: 1 PID: 4466 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f3350215d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbd44 RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 0000000000000019
RBP: 00000000006dbd40 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3350215d80 R14: 000000000000001a R15: 6d74702f7665642f
CPU: 0 PID: 4467 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f33501f4d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbd5c RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 000000000000001b
RBP: 00000000006dbd58 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f33501f4d80 R14: 000000000000001c R15: 6d74702f7665642f
CPU: 1 PID: 4468 Comm: syz-executor589 Not tainted 4.17.0+ #87
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+0x1b9/0x294 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x63/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:170 [inline]
 __tty_buffer_request_room+0x2d2/0x7f0 drivers/tty/tty_buffer.c:268
 tty_insert_flip_string_fixed_flag+0x8d/0x1f0 drivers/tty/tty_buffer.c:313
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0x12c/0x1f0 drivers/tty/pty.c:121
 n_tty_write+0xc41/0x1180 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:958 [inline]
 tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042
 do_loop_readv_writev fs/read_write.c:703 [inline]
 do_iter_write+0x491/0x5f0 fs/read_write.c:961
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445959
Code: e8 9c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f33501d3d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000006dbd74 RCX: 0000000000445959
RDX: 0000000000000001 RSI: 0000000020000600 RDI: 000000000000001d
RBP: 00000000006dbd70 R08: 0000000000000001 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f33501d3d80 R14: 000000000000001e R15: 6d74702f7665642f
random: crng init done

All crashes (3888):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-kasan-gce-root	2018/06/07 04:43	upstream	0ad39cb3	e0e534c6	.config	log	report	syz	C	linux-kernel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com
ci-upstream-kasan-gce	2018/06/07 20:00	upstream	1c8c5a9d	645e75f8	.config	log	report	syz	C	linux-kernel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com
ci-upstream-linux-next-kasan-gce-root	2018/09/08 17:39	linux-next	f2b6e66e	6b5120a4	.config	log	report	syz	C	linux-kernel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com
ci-upstream-kasan-gce-root	2018/08/22 02:29	upstream	0214f46b	95b5c82b	.config	log	report	syz		linux-kernel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com
ci-upstream-kasan-gce-386	2018/06/06 12:05	upstream	af6c5d5e	41f9540d	.config	log	report	syz		linux-kernel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com
ci-upstream-kasan-gce-386	2018/06/07 04:56	upstream	ca95bf62	e0e534c6	.config	log	report	syz		linux-kernel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com
ci-upstream-kasan-gce-smack-root	2018/11/17 18:55	upstream	1ce80e0f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-root	2018/11/17 14:43	upstream	1ce80e0f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/17 11:22	upstream	1ce80e0f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-root	2018/11/17 07:18	upstream	1ce80e0f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/17 05:58	upstream	e6a2562f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce	2018/11/17 03:35	upstream	1ce80e0f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce	2018/11/17 01:16	upstream	1ce80e0f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce	2018/11/17 00:16	upstream	1ce80e0f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/11/16 22:28	upstream	e6a2562f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-root	2018/11/16 18:21	upstream	da5322e6	f5e275d1	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/16 15:51	upstream	da5322e6	f5e275d1	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-root	2018/11/16 14:02	upstream	da5322e6	f5e275d1	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/11/16 12:40	upstream	da5322e6	f5e275d1	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce	2018/11/16 09:59	upstream	da5322e6	f5e275d1	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/11/16 05:28	upstream	da5322e6	3a41052e	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/16 04:19	upstream	da5322e6	3a41052e	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/16 02:02	upstream	da5322e6	3a41052e	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-root	2018/11/15 21:40	upstream	da5322e6	3a41052e	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/15 20:10	upstream	da5322e6	3a41052e	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/15 16:10	upstream	5929a1f0	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce	2018/11/15 14:54	upstream	5929a1f0	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/15 13:54	upstream	5929a1f0	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/15 12:33	upstream	5929a1f0	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-root	2018/11/15 07:31	upstream	d41217aa	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce	2018/11/15 06:12	upstream	d41217aa	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/11/15 05:12	upstream	d41217aa	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/15 04:05	upstream	d41217aa	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/15 03:05	upstream	d41217aa	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/11/15 01:52	upstream	d41217aa	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/15 00:23	upstream	d41217aa	5f5f6d14	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-kasan-gce-386	2018/11/17 13:27	upstream	1ce80e0f	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-net-this-kasan-gce	2018/09/10 11:10	net	5d407b07	6b5120a4	.config	log	report			linux-kernel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com
ci-upstream-bpf-next-kasan-gce	2018/11/13 08:53	bpf-next	407be8d0	5f5f6d14	.config	log	report			axboe@kernel.dk, jikos@kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-net-kasan-gce	2018/10/19 05:15	net-next	3a3295bf	9aba67b5	.config	log	report			davem@davemloft.net, jon.maloy@ericsson.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tipc-discussion@lists.sourceforge.net, ying.xue@windriver.com
ci-upstream-linux-next-kasan-gce-root	2018/11/17 17:04	linux-next	442b8cea	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/11/17 08:55	linux-next	442b8cea	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/11/17 05:15	linux-next	442b8cea	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/11/17 02:28	linux-next	442b8cea	b08ee62a	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/11/16 03:33	linux-next	442b8cea	3a41052e	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/11/15 23:41	linux-next	442b8cea	3a41052e	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/11/15 22:32	linux-next	442b8cea	3a41052e	.config	log	report			gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org