RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 ====================================================== WARNING: possible circular locking dependency detected 4.14.160-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/15708 is trying to acquire lock: (console_owner){-.-.}, at: [] console_trylock_spinning kernel/printk/printk.c:1658 [inline] (console_owner){-.-.}, at: [] vprintk_emit kernel/printk/printk.c:1922 [inline] (console_owner){-.-.}, at: [] vprintk_emit+0x2f1/0x600 kernel/printk/printk.c:1888 but task is already holding lock: (&(&port->lock)->rlock){-.-.}, at: [] pty_write+0xe0/0x1d0 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){-.-.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:160 tty_port_tty_get+0x22/0x90 drivers/tty/tty_port.c:287 tty_port_default_wakeup+0x16/0x40 drivers/tty/tty_port.c:46 tty_port_tty_wakeup+0x57/0x70 drivers/tty/tty_port.c:389 uart_write_wakeup+0x46/0x70 drivers/tty/serial/serial_core.c:116 serial8250_tx_chars+0x40d/0xa10 drivers/tty/serial/8250/8250_port.c:1810 serial8250_handle_irq.part.0+0x206/0x250 drivers/tty/serial/8250/8250_port.c:1883 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1869 [inline] serial8250_default_handle_irq+0xa1/0x120 drivers/tty/serial/8250/8250_port.c:1899 serial8250_interrupt+0xe9/0x1a0 drivers/tty/serial/8250/8250_core.c:129 __handle_irq_event_percpu+0x125/0x7f0 kernel/irq/handle.c:147 handle_irq_event_percpu+0x65/0x130 kernel/irq/handle.c:187 handle_irq_event+0xa7/0x134 kernel/irq/handle.c:204 handle_edge_irq+0x22b/0x840 kernel/irq/chip.c:770 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x39/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x99/0x1d0 arch/x86/kernel/irq.c:230 ret_from_intr+0x0/0x1e arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:192 spin_unlock_irqrestore include/linux/spinlock.h:372 [inline] uart_write+0x29a/0x4f0 drivers/tty/serial/serial_core.c:625 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x38b/0xf20 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 redirected_tty_write+0xa3/0xb0 drivers/tty/tty_io.c:1064 __vfs_write+0x105/0x6b0 fs/read_write.c:480 vfs_write+0x198/0x500 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xfd/0x230 fs/read_write.c:582 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (&port_lock_key){-.-.}: lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:160 serial8250_console_write+0x709/0x930 drivers/tty/serial/8250/8250_port.c:3232 univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:597 call_console_drivers kernel/printk/printk.c:1725 [inline] console_unlock+0x9ba/0xed0 kernel/printk/printk.c:2397 vprintk_emit kernel/printk/printk.c:1923 [inline] vprintk_emit+0x1f9/0x600 kernel/printk/printk.c:1888 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963 vprintk_func+0x5d/0x159 kernel/printk/printk_safe.c:401 printk+0x9e/0xbc kernel/printk/printk.c:1996 register_console+0x614/0x9e0 kernel/printk/printk.c:2716 univ8250_console_init+0x33/0x3f drivers/tty/serial/8250/8250_core.c:692 console_init+0x4d/0x5d kernel/printk/printk.c:2797 start_kernel+0x43c/0x6fd init/main.c:634 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:399 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:380 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #0 (console_owner){-.-.}: check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 console_trylock_spinning kernel/printk/printk.c:1679 [inline] vprintk_emit kernel/printk/printk.c:1922 [inline] vprintk_emit+0x32e/0x600 kernel/printk/printk.c:1888 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963 vprintk_func+0x5d/0x159 kernel/printk/printk_safe.c:401 printk+0x9e/0xbc kernel/printk/printk.c:1996 fail_dump lib/fault-inject.c:44 [inline] should_fail.cold+0xe4/0x159 lib/fault-inject.c:149 should_failslab+0xdb/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x71/0x7a0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:169 [inline] __tty_buffer_request_room+0x1a4/0x500 drivers/tty/tty_buffer.c:267 tty_insert_flip_string_fixed_flag+0x8a/0x1c0 drivers/tty/tty_buffer.c:312 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x113/0x1d0 drivers/tty/pty.c:122 tty_put_char+0x108/0x130 drivers/tty/tty_io.c:2880 do_output_char+0x135/0x7a0 drivers/tty/n_tty.c:488 process_output drivers/tty/n_tty.c:514 [inline] n_tty_write+0x426/0xf20 drivers/tty/n_tty.c:2345 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 __vfs_write+0x105/0x6b0 fs/read_write.c:480 __kernel_write+0xfc/0x370 fs/read_write.c:501 write_pipe_buf+0x148/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 default_file_splice_write+0x3c/0x80 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1018 splice_direct_to_actor+0x29e/0x7b0 fs/splice.c:973 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 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 *** 5 locks held by syz-executor.2/15708: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&tty->atomic_write_lock){+.+.}, at: [] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885 #2: (&o_tty->termios_rwsem/1){++++}, at: [] n_tty_write+0x179/0xf20 drivers/tty/n_tty.c:2316 #3: (&ldata->output_lock){+.+.}, at: [] process_output drivers/tty/n_tty.c:511 [inline] #3: (&ldata->output_lock){+.+.}, at: [] n_tty_write+0x411/0xf20 drivers/tty/n_tty.c:2345 #4: (&(&port->lock)->rlock){-.-.}, at: [] pty_write+0xe0/0x1d0 drivers/tty/pty.c:120 stack backtrace: CPU: 1 PID: 15708 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 console_trylock_spinning kernel/printk/printk.c:1679 [inline] vprintk_emit kernel/printk/printk.c:1922 [inline] vprintk_emit+0x32e/0x600 kernel/printk/printk.c:1888 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963 vprintk_func+0x5d/0x159 kernel/printk/printk_safe.c:401 printk+0x9e/0xbc kernel/printk/printk.c:1996 fail_dump lib/fault-inject.c:44 [inline] should_fail.cold+0xe4/0x159 lib/fault-inject.c:149 should_failslab+0xdb/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x71/0x7a0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:169 [inline] __tty_buffer_request_room+0x1a4/0x500 drivers/tty/tty_buffer.c:267 tty_insert_flip_string_fixed_flag+0x8a/0x1c0 drivers/tty/tty_buffer.c:312 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x113/0x1d0 drivers/tty/pty.c:122 tty_put_char+0x108/0x130 drivers/tty/tty_io.c:2880 do_output_char+0x135/0x7a0 drivers/tty/n_tty.c:488 process_output drivers/tty/n_tty.c:514 [inline] n_tty_write+0x426/0xf20 drivers/tty/n_tty.c:2345 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 __vfs_write+0x105/0x6b0 fs/read_write.c:480 __kernel_write+0xfc/0x370 fs/read_write.c:501 write_pipe_buf+0x148/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 default_file_splice_write+0x3c/0x80 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1018 splice_direct_to_actor+0x29e/0x7b0 fs/splice.c:973 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f5235f1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5235f1fc90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 sched: RT throttling activated kobject: 'loop2' (ffff8880a40aede0): kobject_uevent_env kobject: 'loop2' (ffff8880a40aede0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (ffff8880a406ed60): kobject_uevent_env kobject: 'loop1' (ffff8880a406ed60): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (ffff8880a40fd6e0): kobject_uevent_env kobject: 'loop3' (ffff8880a40fd6e0): fill_kobj_path: path = '/devices/virtual/block/loop3' FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 15726 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_failslab+0xdb/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x71/0x7a0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:169 [inline] __tty_buffer_request_room+0x1a4/0x500 drivers/tty/tty_buffer.c:267 tty_insert_flip_string_fixed_flag+0x8a/0x1c0 drivers/tty/tty_buffer.c:312 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x113/0x1d0 drivers/tty/pty.c:122 do_output_char+0x524/0x7a0 drivers/tty/n_tty.c:447 process_output drivers/tty/n_tty.c:514 [inline] n_tty_write+0x426/0xf20 drivers/tty/n_tty.c:2345 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 __vfs_write+0x105/0x6b0 fs/read_write.c:480 kobject: 'loop4' (ffff8880a4168620): kobject_uevent_env kobject: 'loop4' (ffff8880a4168620): fill_kobj_path: path = '/devices/virtual/block/loop4' __kernel_write+0xfc/0x370 fs/read_write.c:501 write_pipe_buf+0x148/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 default_file_splice_write+0x3c/0x80 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1018 splice_direct_to_actor+0x29e/0x7b0 fs/splice.c:973 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f5235f1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5235f1fc90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 kobject: 'loop2' (ffff8880a40aede0): kobject_uevent_env kobject: 'loop2' (ffff8880a40aede0): fill_kobj_path: path = '/devices/virtual/block/loop2' FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 15763 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_fail_alloc_page mm/page_alloc.c:2891 [inline] prepare_alloc_pages mm/page_alloc.c:4124 [inline] __alloc_pages_nodemask+0x1d6/0x7a0 mm/page_alloc.c:4172 FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 alloc_pages_current+0xec/0x1e0 mm/mempolicy.c:2113 alloc_pages include/linux/gfp.h:520 [inline] push_pipe+0x3cb/0x780 lib/iov_iter.c:515 __pipe_get_pages lib/iov_iter.c:1035 [inline] pipe_get_pages_alloc lib/iov_iter.c:1139 [inline] iov_iter_get_pages_alloc+0x4fc/0xef0 lib/iov_iter.c:1157 default_file_splice_read+0x17c/0x870 fs/splice.c:390 do_splice_to+0x105/0x170 fs/splice.c:880 splice_direct_to_actor+0x222/0x7b0 fs/splice.c:952 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f5235f1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5235f1fc90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 CPU: 1 PID: 15765 Comm: syz-executor.1 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_fail_alloc_page mm/page_alloc.c:2891 [inline] prepare_alloc_pages mm/page_alloc.c:4124 [inline] __alloc_pages_nodemask+0x1d6/0x7a0 mm/page_alloc.c:4172 alloc_pages_current+0xec/0x1e0 mm/mempolicy.c:2113 alloc_pages include/linux/gfp.h:520 [inline] push_pipe+0x3cb/0x780 lib/iov_iter.c:515 __pipe_get_pages lib/iov_iter.c:1035 [inline] pipe_get_pages_alloc lib/iov_iter.c:1139 [inline] iov_iter_get_pages_alloc+0x4fc/0xef0 lib/iov_iter.c:1157 default_file_splice_read+0x17c/0x870 fs/splice.c:390 kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' do_splice_to+0x105/0x170 fs/splice.c:880 splice_direct_to_actor+0x222/0x7b0 fs/splice.c:952 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 kobject: 'loop4' (ffff8880a4168620): kobject_uevent_env SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 kobject: 'loop4' (ffff8880a4168620): fill_kobj_path: path = '/devices/virtual/block/loop4' do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f3e16804c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f3e16804c90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f3e168056d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 kobject: 'loop2' (ffff8880a40aede0): kobject_uevent_env kobject: 'loop2' (ffff8880a40aede0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (ffff8880a406ed60): kobject_uevent_env kobject: 'loop1' (ffff8880a406ed60): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (ffff8880a40fd6e0): kobject_uevent_env kobject: 'loop3' (ffff8880a40fd6e0): fill_kobj_path: path = '/devices/virtual/block/loop3' FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 15779 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_failslab+0xdb/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x71/0x7a0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:169 [inline] __tty_buffer_request_room+0x1a4/0x500 drivers/tty/tty_buffer.c:267 tty_insert_flip_string_fixed_flag+0x8a/0x1c0 drivers/tty/tty_buffer.c:312 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x113/0x1d0 drivers/tty/pty.c:122 tty_put_char+0x108/0x130 drivers/tty/tty_io.c:2880 do_output_char+0x135/0x7a0 drivers/tty/n_tty.c:488 process_output drivers/tty/n_tty.c:514 [inline] n_tty_write+0x426/0xf20 drivers/tty/n_tty.c:2345 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 __vfs_write+0x105/0x6b0 fs/read_write.c:480 __kernel_write+0xfc/0x370 fs/read_write.c:501 write_pipe_buf+0x148/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 default_file_splice_write+0x3c/0x80 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1018 splice_direct_to_actor+0x29e/0x7b0 fs/splice.c:973 kobject: 'loop4' (ffff8880a4168620): kobject_uevent_env do_splice_direct+0x18d/0x230 fs/splice.c:1061 kobject: 'loop4' (ffff8880a4168620): fill_kobj_path: path = '/devices/virtual/block/loop4' do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 ptrace attach of "/root/syz-executor.3"[15802] was attempted by "/root/syz-executor.3"[15803] do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f5235f1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5235f1fc90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 kobject: 'loop4' (ffff8880a4168620): kobject_uevent_env FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 kobject: 'loop4' (ffff8880a4168620): fill_kobj_path: path = '/devices/virtual/block/loop4' CPU: 1 PID: 15817 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_failslab+0xdb/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x71/0x7a0 mm/slab.c:3729 kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env kmalloc include/linux/slab.h:493 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:169 [inline] __tty_buffer_request_room+0x1a4/0x500 drivers/tty/tty_buffer.c:267 tty_insert_flip_string_fixed_flag+0x8a/0x1c0 drivers/tty/tty_buffer.c:312 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x113/0x1d0 drivers/tty/pty.c:122 do_output_char+0x6f1/0x7a0 drivers/tty/n_tty.c:469 kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' process_output drivers/tty/n_tty.c:514 [inline] n_tty_write+0x426/0xf20 drivers/tty/n_tty.c:2345 kobject: 'loop3' (ffff8880a40fd6e0): kobject_uevent_env do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 kobject: 'loop3' (ffff8880a40fd6e0): fill_kobj_path: path = '/devices/virtual/block/loop3' __vfs_write+0x105/0x6b0 fs/read_write.c:480 kobject: 'loop2' (ffff8880a40aede0): kobject_uevent_env kobject: 'loop2' (ffff8880a40aede0): fill_kobj_path: path = '/devices/virtual/block/loop2' __kernel_write+0xfc/0x370 fs/read_write.c:501 write_pipe_buf+0x148/0x1c0 fs/splice.c:797 kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' splice_from_pipe+0xf0/0x150 fs/splice.c:661 default_file_splice_write+0x3c/0x80 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1018 splice_direct_to_actor+0x29e/0x7b0 fs/splice.c:973 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f5235f1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5235f1fc90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 kobject: 'loop2' (ffff8880a40aede0): kobject_uevent_env kobject: 'loop2' (ffff8880a40aede0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop1' (ffff8880a406ed60): kobject_uevent_env FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 15831 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0 kobject: 'loop1' (ffff8880a406ed60): fill_kobj_path: path = '/devices/virtual/block/loop1' Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_fail_alloc_page mm/page_alloc.c:2891 [inline] prepare_alloc_pages mm/page_alloc.c:4124 [inline] __alloc_pages_nodemask+0x1d6/0x7a0 mm/page_alloc.c:4172 alloc_pages_current+0xec/0x1e0 mm/mempolicy.c:2113 kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env alloc_pages include/linux/gfp.h:520 [inline] push_pipe+0x3cb/0x780 lib/iov_iter.c:515 __pipe_get_pages lib/iov_iter.c:1035 [inline] pipe_get_pages_alloc lib/iov_iter.c:1139 [inline] iov_iter_get_pages_alloc+0x4fc/0xef0 lib/iov_iter.c:1157 default_file_splice_read+0x17c/0x870 fs/splice.c:390 kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a4168620): kobject_uevent_env do_splice_to+0x105/0x170 fs/splice.c:880 splice_direct_to_actor+0x222/0x7b0 fs/splice.c:952 kobject: 'loop4' (ffff8880a4168620): fill_kobj_path: path = '/devices/virtual/block/loop4' do_splice_direct+0x18d/0x230 fs/splice.c:1061 kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 kobject: 'loop4' (ffff8880a4168620): kobject_uevent_env RIP: 0033:0x45a919 RSP: 002b:00007f5235f1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5235f1fc90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 kobject: 'loop4' (ffff8880a4168620): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (ffff8880a40aede0): kobject_uevent_env kobject: 'loop2' (ffff8880a40aede0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (ffff8880a40fd6e0): kobject_uevent_env kobject: 'loop3' (ffff8880a40fd6e0): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (ffff8880a4168620): kobject_uevent_env kobject: 'loop4' (ffff8880a4168620): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (ffff8880a406ed60): kobject_uevent_env kobject: 'loop1' (ffff8880a406ed60): fill_kobj_path: path = '/devices/virtual/block/loop1' FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 15870 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_failslab+0xdb/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x71/0x7a0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:169 [inline] __tty_buffer_request_room+0x1a4/0x500 drivers/tty/tty_buffer.c:267 tty_insert_flip_string_fixed_flag+0x8a/0x1c0 drivers/tty/tty_buffer.c:312 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x113/0x1d0 drivers/tty/pty.c:122 do_output_char+0x6f1/0x7a0 drivers/tty/n_tty.c:469 process_output drivers/tty/n_tty.c:514 [inline] n_tty_write+0x426/0xf20 drivers/tty/n_tty.c:2345 do_tty_write drivers/tty/tty_io.c:959 [inline] tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043 __vfs_write+0x105/0x6b0 fs/read_write.c:480 __kernel_write+0xfc/0x370 fs/read_write.c:501 write_pipe_buf+0x148/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 default_file_splice_write+0x3c/0x80 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1018 splice_direct_to_actor+0x29e/0x7b0 fs/splice.c:973 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5' SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f5235f1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5235f1fc90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 kobject: 'loop2' (ffff8880a40aede0): kobject_uevent_env kobject: 'loop2' (ffff8880a40aede0): fill_kobj_path: path = '/devices/virtual/block/loop2' FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 15882 Comm: syz-executor.2 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10f/0x159 lib/fault-inject.c:149 should_fail_alloc_page mm/page_alloc.c:2891 [inline] prepare_alloc_pages mm/page_alloc.c:4124 [inline] __alloc_pages_nodemask+0x1d6/0x7a0 mm/page_alloc.c:4172 alloc_pages_current+0xec/0x1e0 mm/mempolicy.c:2113 alloc_pages include/linux/gfp.h:520 [inline] push_pipe+0x3cb/0x780 lib/iov_iter.c:515 __pipe_get_pages lib/iov_iter.c:1035 [inline] pipe_get_pages_alloc lib/iov_iter.c:1139 [inline] iov_iter_get_pages_alloc+0x4fc/0xef0 lib/iov_iter.c:1157 default_file_splice_read+0x17c/0x870 fs/splice.c:390 kobject: 'loop1' (ffff8880a406ed60): kobject_uevent_env do_splice_to+0x105/0x170 fs/splice.c:880 splice_direct_to_actor+0x222/0x7b0 fs/splice.c:952 Unknown ioctl -1073457888 do_splice_direct+0x18d/0x230 fs/splice.c:1061 kobject: 'loop1' (ffff8880a406ed60): fill_kobj_path: path = '/devices/virtual/block/loop1' do_sendfile+0x4db/0xbd0 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1488 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f5235f1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5235f1fc90 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 000000006f0a77bd R11: 0000000000000246 R12: 00007f5235f206d4 R13: 00000000004c9253 R14: 00000000004e0f50 R15: 0000000000000008 kobject: 'loop2' (ffff8880a40aede0): kobject_uevent_env kobject: 'loop2' (ffff8880a40aede0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (ffff8880a4168620): kobject_uevent_env kobject: 'loop4' (ffff8880a4168620): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (ffff8880a406ed60): kobject_uevent_env kobject: 'loop1' (ffff8880a406ed60): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (ffff8880a41c06a0): kobject_uevent_env kobject: 'loop5' (ffff8880a41c06a0): fill_kobj_path: path = '/devices/virtual/block/loop5'