RDX: 0000000020000100 RSI: 0000000000005412 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 R13: 000000000000054b R14: 00000000004c68de R15: 0000000000000000 ====================================================== WARNING: possible circular locking dependency detected 4.14.168-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/10510 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 do_output_char+0x524/0x7a0 drivers/tty/n_tty.c:447 __process_echoes+0x316/0x8a0 drivers/tty/n_tty.c:739 flush_echoes drivers/tty/n_tty.c:829 [inline] __receive_buf drivers/tty/n_tty.c:1648 [inline] n_tty_receive_buf_common+0x8ed/0x2570 drivers/tty/n_tty.c:1742 n_tty_receive_buf+0x31/0x3b drivers/tty/n_tty.c:1771 tiocsti drivers/tty/tty_io.c:2186 [inline] tty_ioctl+0xded/0x1320 drivers/tty/tty_io.c:2572 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 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 *** 4 locks held by syz-executor.4/10510: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&o_tty->termios_rwsem/1){++++}, at: [] n_tty_receive_buf_common+0x8f/0x2570 drivers/tty/n_tty.c:1705 #2: (&ldata->output_lock){+.+.}, at: [] flush_echoes drivers/tty/n_tty.c:827 [inline] #2: (&ldata->output_lock){+.+.}, at: [] __receive_buf drivers/tty/n_tty.c:1648 [inline] #2: (&ldata->output_lock){+.+.}, at: [] n_tty_receive_buf_common+0x8ad/0x2570 drivers/tty/n_tty.c:1742 #3: (&(&port->lock)->rlock){-.-.}, at: [] pty_write+0xe0/0x1d0 drivers/tty/pty.c:120 stack backtrace: CPU: 1 PID: 10510 Comm: syz-executor.4 Not tainted 4.14.168-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 do_output_char+0x524/0x7a0 drivers/tty/n_tty.c:447 __process_echoes+0x316/0x8a0 drivers/tty/n_tty.c:739 flush_echoes drivers/tty/n_tty.c:829 [inline] __receive_buf drivers/tty/n_tty.c:1648 [inline] n_tty_receive_buf_common+0x8ed/0x2570 drivers/tty/n_tty.c:1742 n_tty_receive_buf+0x31/0x3b drivers/tty/n_tty.c:1771 tiocsti drivers/tty/tty_io.c:2186 [inline] tty_ioctl+0xded/0x1320 drivers/tty/tty_io.c:2572 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45b349 RSP: 002b:00007f2a9588ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2a9588f6d4 RCX: 000000000045b349 RDX: 0000000020000100 RSI: 0000000000005412 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 R13: 000000000000054b R14: 00000000004c68de R15: 0000000000000000 xt_TCPMSS: Only works on TCP SYN packets FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 10531 Comm: syz-executor.0 Not tainted 4.14.168-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_node mm/slab.c:3297 [inline] kmem_cache_alloc_node+0x287/0x780 mm/slab.c:3640 __alloc_skb+0x9c/0x500 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:980 [inline] alloc_skb_with_frags+0x86/0x4b0 net/core/skbuff.c:5228 sock_alloc_send_pskb+0x5db/0x740 net/core/sock.c:2078 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2095 __ip6_append_data.isra.0+0x17b8/0x2af0 net/ipv6/ip6_output.c:1419 ip6_make_skb+0x240/0x410 net/ipv6/ip6_output.c:1768 udpv6_sendmsg+0x1e80/0x2610 net/ipv6/udp.c:1347 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45b349 RSP: 002b:00007fdbc2774c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fdbc27756d4 RCX: 000000000045b349 RDX: 0000000000000001 RSI: 0000000020008980 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00000000000008cd R14: 00000000004ca21a R15: 0000000000000002 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 10541 Comm: syz-executor.0 Not tainted 4.14.168-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] kmem_cache_alloc+0x47/0x780 mm/slab.c:3550 skb_clone+0x129/0x320 net/core/skbuff.c:1282 ip6_finish_output2+0x1613/0x21b0 net/ipv6/ip6_output.c:78 ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:462 [inline] ip6_local_out+0x97/0x170 net/ipv6/output_core.c:178 ip6_send_skb+0xa2/0x330 net/ipv6/ip6_output.c:1688 udp_v6_send_skb+0x50b/0xee0 net/ipv6/udp.c:1081 udpv6_sendmsg+0x1eb9/0x2610 net/ipv6/udp.c:1353 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45b349 RSP: 002b:00007fdbc2774c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fdbc27756d4 RCX: 000000000045b349 RDX: 0000000000000001 RSI: 0000000020008980 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00000000000008cd R14: 00000000004ca21a R15: 0000000000000003 xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets IPVS: length: 115 != 8 IPVS: length: 115 != 8 xt_TCPMSS: Only works on TCP SYN packets netlink: 116 bytes leftover after parsing attributes in process `syz-executor.2'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=10794 comm=syz-executor.2 Unknown ioctl 35304 Unknown ioctl 35304 xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets QAT: Invalid ioctl xt_TCPMSS: Only works on TCP SYN packets QAT: Invalid ioctl xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets FAT-fs (loop5): Unrecognized mount option "fsuuid=375af047-328a-550a-e98c-91cf94ô9" or missing value xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets xt_TCPMSS: Only works on TCP SYN packets