RBP: 00007f270e9ee1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd580b83cf R14: 00007f270e9ee300 R15: 0000000000022000 ====================================================== WARNING: possible circular locking dependency detected 5.10.60 #1 Not tainted ------------------------------------------------------ syz-executor.7/9018 is trying to acquire lock: ffffffff84d0a920 (console_owner){-.-.}-{0:0}, at: console_unlock+0x2e1/0xb30 kernel/printk/printk.c:2498 but task is already holding lock: ffff88800f790958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&port->lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159 tty_port_tty_get+0x1f/0x100 drivers/tty/tty_port.c:288 tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:47 serial8250_tx_chars+0x516/0xac0 drivers/tty/serial/8250/8250_port.c:1850 serial8250_handle_irq.part.0+0x2d9/0x4d0 drivers/tty/serial/8250/8250_port.c:1937 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1910 [inline] serial8250_default_handle_irq+0xb8/0x230 drivers/tty/serial/8250/8250_port.c:1953 serial8250_interrupt+0xf4/0x1a0 drivers/tty/serial/8250/8250_core.c:126 __handle_irq_event_percpu+0x2ef/0x820 kernel/irq/handle.c:156 handle_irq_event_percpu kernel/irq/handle.c:196 [inline] handle_irq_event+0x102/0x290 kernel/irq/handle.c:213 handle_edge_irq+0x249/0xd00 kernel/irq/chip.c:822 asm_call_irq_on_stack+0x12/0x20 __run_irq_on_irqstack arch/x86/include/asm/irq_stack.h:48 [inline] run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:101 [inline] handle_irq arch/x86/kernel/irq.c:230 [inline] __common_interrupt arch/x86/kernel/irq.c:249 [inline] common_interrupt+0xdd/0x190 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:626 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline] arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x25/0x40 kernel/locking/spinlock.c:191 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] uart_write+0x30b/0x5f0 drivers/tty/serial/serial_core.c:615 do_output_char+0x5e4/0x860 drivers/tty/n_tty.c:442 process_output drivers/tty/n_tty.c:509 [inline] n_tty_write+0x47c/0xf80 drivers/tty/n_tty.c:2361 do_tty_write drivers/tty/tty_io.c:1028 [inline] file_tty_write.constprop.0+0x4f8/0x8d0 drivers/tty/tty_io.c:1118 tty_write drivers/tty/tty_io.c:1125 [inline] redirected_tty_write drivers/tty/tty_io.c:1147 [inline] redirected_tty_write+0xa1/0xc0 drivers/tty/tty_io.c:1128 call_write_iter include/linux/fs.h:1903 [inline] do_iter_readv_writev+0x471/0x750 fs/read_write.c:740 do_iter_write+0x18d/0x670 fs/read_write.c:866 vfs_writev+0x1d7/0x620 fs/read_write.c:939 do_writev+0x139/0x300 fs/read_write.c:982 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #1 (&port_lock_key){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159 serial8250_console_write+0x8e2/0xb20 drivers/tty/serial/8250/8250_port.c:3323 call_console_drivers kernel/printk/printk.c:1909 [inline] console_unlock+0x823/0xb30 kernel/printk/printk.c:2523 register_console kernel/printk/printk.c:2864 [inline] register_console+0x523/0x800 kernel/printk/printk.c:2754 univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:690 console_init+0x361/0x4fa kernel/printk/printk.c:2974 start_kernel+0x2ed/0x496 init/main.c:984 secondary_startup_64_no_verify+0xc2/0xcb -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:2985 [inline] check_prevs_add kernel/locking/lockdep.c:3110 [inline] validate_chain kernel/locking/lockdep.c:3725 [inline] __lock_acquire+0x29fd/0x5b60 kernel/locking/lockdep.c:4950 lock_acquire kernel/locking/lockdep.c:5560 [inline] lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5525 console_lock_spinning_enable kernel/printk/printk.c:1761 [inline] console_unlock+0x360/0xb30 kernel/printk/printk.c:2520 vprintk_emit+0x1da/0x4d0 kernel/printk/printk.c:2052 vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401 printk+0xba/0xed kernel/printk/printk.c:2100 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x470/0x590 lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1193 slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2814 [inline] slab_alloc mm/slub.c:2897 [inline] __kmalloc+0x72/0x3e0 mm/slub.c:3958 kmalloc include/linux/slab.h:557 [inline] tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:175 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:273 tty_insert_flip_string_fixed_flag+0x8d/0x250 drivers/tty/tty_buffer.c:318 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x126/0x1f0 drivers/tty/pty.c:122 n_tty_write+0xa39/0xf80 drivers/tty/n_tty.c:2372 do_tty_write drivers/tty/tty_io.c:1028 [inline] file_tty_write.constprop.0+0x4f8/0x8d0 drivers/tty/tty_io.c:1118 call_write_iter include/linux/fs.h:1903 [inline] do_iter_readv_writev+0x471/0x750 fs/read_write.c:740 do_iter_write+0x18d/0x670 fs/read_write.c:866 vfs_writev+0x1d7/0x620 fs/read_write.c:939 do_writev+0x139/0x300 fs/read_write.c:982 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 other info that might help us debug this: Chain exists of: console_owner --> &port_lock_key --> &port->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&port->lock); lock(&port_lock_key); lock(&port->lock); lock(console_owner); *** DEADLOCK *** 6 locks held by syz-executor.7/9018: #0: ffff888041058098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffff888041058130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:952 [inline] #1: ffff888041058130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:975 [inline] #1: ffff888041058130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x29d/0x8d0 drivers/tty/tty_io.c:1118 #2: ffff8880410582e8 (&tty->termios_rwsem){++++}-{3:3}, at: n_tty_write+0x1bc/0xf80 drivers/tty/n_tty.c:2332 #3: ffffc90012989378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_write+0xa00/0xf80 drivers/tty/n_tty.c:2371 #4: ffff88800f790958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120 #5: ffffffff84deaca0 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401 stack backtrace: CPU: 1 PID: 9018 Comm: syz-executor.7 Not tainted 5.10.60 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 check_noncircular+0x268/0x310 kernel/locking/lockdep.c:2120 check_prev_add kernel/locking/lockdep.c:2985 [inline] check_prevs_add kernel/locking/lockdep.c:3110 [inline] validate_chain kernel/locking/lockdep.c:3725 [inline] __lock_acquire+0x29fd/0x5b60 kernel/locking/lockdep.c:4950 lock_acquire kernel/locking/lockdep.c:5560 [inline] lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5525 console_lock_spinning_enable kernel/printk/printk.c:1761 [inline] console_unlock+0x360/0xb30 kernel/printk/printk.c:2520 vprintk_emit+0x1da/0x4d0 kernel/printk/printk.c:2052 vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401 printk+0xba/0xed kernel/printk/printk.c:2100 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x470/0x590 lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1193 slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2814 [inline] slab_alloc mm/slub.c:2897 [inline] __kmalloc+0x72/0x3e0 mm/slub.c:3958 kmalloc include/linux/slab.h:557 [inline] tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:175 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:273 tty_insert_flip_string_fixed_flag+0x8d/0x250 drivers/tty/tty_buffer.c:318 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x126/0x1f0 drivers/tty/pty.c:122 n_tty_write+0xa39/0xf80 drivers/tty/n_tty.c:2372 do_tty_write drivers/tty/tty_io.c:1028 [inline] file_tty_write.constprop.0+0x4f8/0x8d0 drivers/tty/tty_io.c:1118 call_write_iter include/linux/fs.h:1903 [inline] do_iter_readv_writev+0x471/0x750 fs/read_write.c:740 do_iter_write+0x18d/0x670 fs/read_write.c:866 vfs_writev+0x1d7/0x620 fs/read_write.c:939 do_writev+0x139/0x300 fs/read_write.c:982 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466609 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f270e9ee188 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609 RDX: 0000000000000001 RSI: 0000000020001440 RDI: 0000000000000004 RBP: 00007f270e9ee1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd580b83cf R14: 00007f270e9ee300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 9027 Comm: syz-executor.5 Not tainted 5.10.60 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1193 slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2814 [inline] __kmalloc_node_track_caller+0x74/0x400 mm/slub.c:4487 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xb1/0x620 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] alloc_skb_with_frags+0x95/0x530 net/core/skbuff.c:5895 sock_alloc_send_pskb+0x742/0x8a0 net/core/sock.c:2331 __ip6_append_data.isra.0+0x1bd7/0x3a10 net/ipv6/ip6_output.c:1653 ip6_append_data+0x1e7/0x330 net/ipv6/ip6_output.c:1828 icmp6_send+0x1235/0x21a0 net/ipv6/icmp.c:618 __icmpv6_send include/linux/icmpv6.h:28 [inline] icmpv6_send include/linux/icmpv6.h:49 [inline] ip6_pkt_drop+0x2f3/0x760 net/ipv6/route.c:4394 dst_output include/net/dst.h:443 [inline] ip6_local_out+0xb4/0x1a0 net/ipv6/output_core.c:161 ip6_send_skb+0xb7/0x340 net/ipv6/ip6_output.c:1936 udp_v6_send_skb+0x8cd/0x15b0 net/ipv6/udp.c:1233 udpv6_sendmsg+0x2049/0x2860 net/ipv6/udp.c:1531 inet6_sendmsg+0xfd/0x140 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xee/0x190 net/socket.c:671 ____sys_sendmsg+0x32e/0x860 net/socket.c:2340 ___sys_sendmsg+0xff/0x170 net/socket.c:2394 __sys_sendmmsg+0x192/0x460 net/socket.c:2484 __do_sys_sendmmsg net/socket.c:2513 [inline] __se_sys_sendmmsg net/socket.c:2510 [inline] __x64_sys_sendmmsg+0x98/0x100 net/socket.c:2510 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466609 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1e9d940188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609 RDX: 0000000000000001 RSI: 0000000020004d00 RDI: 0000000000000004 RBP: 00007f1e9d9401d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffd3569a66f R14: 00007f1e9d940300 R15: 0000000000022000 kmemleak: 24 new suspected memory leaks (see /sys/kernel/debug/kmemleak)