RDX: 0000000020000001 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007f5b08e361d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe5bc05daf R14: 00007f5b08e36300 R15: 0000000000022000 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/31465 is trying to acquire lock: 000000009b3bf115 (console_owner){-...}, at: log_next kernel/printk/printk.c:511 [inline] 000000009b3bf115 (console_owner){-...}, at: console_unlock+0x3a9/0x1110 kernel/printk/printk.c:2447 but task is already holding lock: 00000000d02db627 (&(&port->lock)->rlock){-.-.}, 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)->rlock){-.-.}: tty_port_tty_get+0x1d/0x80 drivers/tty/tty_port.c:289 tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:47 serial8250_tx_chars+0x490/0xaf0 drivers/tty/serial/8250/8250_port.c:1813 serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1900 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1873 [inline] serial8250_default_handle_irq+0xae/0x220 drivers/tty/serial/8250/8250_port.c:1916 serial8250_interrupt+0x101/0x240 drivers/tty/serial/8250/8250_core.c:125 __handle_irq_event_percpu+0x27e/0x8e0 kernel/irq/handle.c:149 handle_irq_event_percpu kernel/irq/handle.c:189 [inline] handle_irq_event+0x102/0x290 kernel/irq/handle.c:206 handle_edge_irq+0x260/0xcf0 kernel/irq/chip.c:800 generic_handle_irq_desc include/linux/irqdesc.h:155 [inline] handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x93/0x1c0 arch/x86/kernel/irq.c:246 ret_from_intr+0x0/0x1e arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] uart_write+0x3bb/0x6f0 drivers/tty/serial/serial_core.c:612 do_output_char+0x5de/0x850 drivers/tty/n_tty.c:445 process_output drivers/tty/n_tty.c:512 [inline] n_tty_write+0x46e/0xff0 drivers/tty/n_tty.c:2343 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x496/0x810 drivers/tty/tty_io.c:1044 redirected_tty_write+0xaa/0xb0 drivers/tty/tty_io.c:1065 do_loop_readv_writev fs/read_write.c:704 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_write+0x461/0x5d0 fs/read_write.c:962 vfs_writev+0x153/0x2e0 fs/read_write.c:1005 do_writev+0x136/0x330 fs/read_write.c:1040 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&port_lock_key){-.-.}: serial8250_console_write+0x90e/0xb70 drivers/tty/serial/8250/8250_port.c:3290 call_console_drivers kernel/printk/printk.c:1764 [inline] console_unlock+0xbb6/0x1110 kernel/printk/printk.c:2460 vprintk_emit+0x2d1/0x740 kernel/printk/printk.c:1965 vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 printk+0xba/0xed kernel/printk/printk.c:2040 register_console+0x87f/0xc90 kernel/printk/printk.c:2776 univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:684 console_init+0x4cb/0x718 kernel/printk/printk.c:2862 start_kernel+0x686/0x911 init/main.c:659 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #0 (console_owner){-...}: console_lock_spinning_enable kernel/printk/printk.c:1627 [inline] console_unlock+0x411/0x1110 kernel/printk/printk.c:2457 vprintk_emit+0x2d1/0x740 kernel/printk/printk.c:1965 vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 printk+0xba/0xed kernel/printk/printk.c:2040 fail_dump lib/fault-inject.c:44 [inline] should_fail+0x66b/0x7b0 lib/fault-inject.c:149 __should_failslab+0x115/0x180 mm/failslab.c:32 should_failslab+0x5/0x10 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x6d/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:170 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x250 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x126/0x1f0 drivers/tty/pty.c:122 n_hdlc_send_frames+0x278/0x470 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x55e/0x640 drivers/tty/n_hdlc.c:713 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x496/0x810 drivers/tty/tty_io.c:1044 __vfs_write+0xf7/0x770 fs/read_write.c:485 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: console_owner --> &port_lock_key --> &(&port->lock)->rlock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&(&port->lock)->rlock); lock(&port_lock_key); lock(&(&port->lock)->rlock); lock(console_owner); *** DEADLOCK *** 4 locks held by syz-executor.4/31465: #0: 00000000eb6b36ff (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000098bc0f5e (&tty->atomic_write_lock){+.+.}, at: tty_write_lock drivers/tty/tty_io.c:886 [inline] #1: 0000000098bc0f5e (&tty->atomic_write_lock){+.+.}, at: do_tty_write drivers/tty/tty_io.c:909 [inline] #1: 0000000098bc0f5e (&tty->atomic_write_lock){+.+.}, at: tty_write+0x24e/0x810 drivers/tty/tty_io.c:1044 #2: 00000000d02db627 (&(&port->lock)->rlock){-.-.}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120 #3: 00000000f8a5da07 (console_lock){+.+.}, at: vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 stack backtrace: CPU: 0 PID: 31465 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 console_lock_spinning_enable kernel/printk/printk.c:1627 [inline] console_unlock+0x411/0x1110 kernel/printk/printk.c:2457 vprintk_emit+0x2d1/0x740 kernel/printk/printk.c:1965 vprintk_func+0x79/0x180 kernel/printk/printk_safe.c:405 printk+0xba/0xed kernel/printk/printk.c:2040 fail_dump lib/fault-inject.c:44 [inline] should_fail+0x66b/0x7b0 lib/fault-inject.c:149 __should_failslab+0x115/0x180 mm/failslab.c:32 should_failslab+0x5/0x10 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x6d/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:170 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:268 tty_insert_flip_string_fixed_flag+0x93/0x250 drivers/tty/tty_buffer.c:313 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x126/0x1f0 drivers/tty/pty.c:122 n_hdlc_send_frames+0x278/0x470 drivers/tty/n_hdlc.c:403 n_hdlc_tty_write+0x55e/0x640 drivers/tty/n_hdlc.c:713 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x496/0x810 drivers/tty/tty_io.c:1044 __vfs_write+0xf7/0x770 fs/read_write.c:485 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5b0a8c40c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5b08e36168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f5b0a9e3f80 RCX: 00007f5b0a8c40c9 RDX: 0000000020000001 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007f5b08e361d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe5bc05daf R14: 00007f5b08e36300 R15: 0000000000022000 hfsplus: session requires an argument hfsplus: unable to parse mount options EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1325465600) and clusters per group (16384) inconsistent EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed hfsplus: session requires an argument hfsplus: unable to parse mount options hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option hfsplus: session requires an argument EXT4-fs (loop2): blocks per group (1325531136) and clusters per group (16384) inconsistent hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option hfsplus: session requires an argument EXT4-fs (loop2): blocks per group (1325596672) and clusters per group (16384) inconsistent hfsplus: unable to parse mount options EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed xt_ct_set_helper: 17 callbacks suppressed xt_CT: You must specify a L4 protocol and not use inversions on it hfsplus: unable to parse mount options xt_CT: You must specify a L4 protocol and not use inversions on it hfsplus: session requires an argument hfsplus: unable to parse mount options hfsplus: unable to parse mount options EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1342177280) and clusters per group (16384) inconsistent EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed xt_CT: You must specify a L4 protocol and not use inversions on it hfsplus: session requires an argument EXT4-fs (loop2): Ignoring removed oldalloc option hfsplus: unable to parse mount options EXT4-fs (loop2): blocks per group (1342242816) and clusters per group (16384) inconsistent EXT4-fs (loop1): Ignoring removed oldalloc option hfsplus: unable to parse mount options EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it hfsplus: session requires an argument hfsplus: unable to parse mount options hfsplus: unable to parse mount options hfsplus: session requires an argument hfsplus: unable to parse mount options EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1342308352) and clusters per group (16384) inconsistent EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed xt_CT: You must specify a L4 protocol and not use inversions on it hfsplus: session requires an argument hfsplus: unable to parse mount options xt_CT: You must specify a L4 protocol and not use inversions on it hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1342373888) and clusters per group (16384) inconsistent EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop2): Ignoring removed oldalloc option hfsplus: unable to parse mount options hfsplus: session requires an argument EXT4-fs (loop2): blocks per group (1358954496) and clusters per group (16384) inconsistent hfsplus: unable to parse mount options EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed xt_CT: You must specify a L4 protocol and not use inversions on it hfsplus: session requires an argument hfsplus: unable to parse mount options hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1359020032) and clusters per group (16384) inconsistent EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed hfsplus: session requires an argument hfsplus: unable to parse mount options hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1359085568) and clusters per group (16384) inconsistent EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed hfsplus: session requires an argument hfsplus: unable to parse mount options hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1359151104) and clusters per group (16384) inconsistent EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed hfsplus: session requires an argument hfsplus: unable to parse mount options EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1375731712) and clusters per group (16384) inconsistent EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed hfsplus: unable to parse mount options hfsplus: session requires an argument hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1375797248) and clusters per group (16384) inconsistent EXT4-fs (loop1): Ignoring removed oldalloc option EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed EXT4-fs (loop1): Ignoring removed oldalloc option hfsplus: session requires an argument hfsplus: unable to parse mount options EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1375862784) and clusters per group (16384) inconsistent EXT4-fs (loop1): get root inode failed hfsplus: unable to parse mount options EXT4-fs (loop1): mount failed xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it xt_CT: You must specify a L4 protocol and not use inversions on it hfsplus: session requires an argument hfsplus: unable to parse mount options ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 hfsplus: session requires an argument hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop1): Ignoring removed oldalloc option hfsplus: unable to parse mount options EXT4-fs (loop2): blocks per group (1375928320) and clusters per group (16384) inconsistent EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1392508928) and clusters per group (16384) inconsistent hfsplus: unable to parse mount options hfsplus: session requires an argument hfsplus: unable to parse mount options EXT4-fs (loop1): Ignoring removed oldalloc option hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1392574464) and clusters per group (16384) inconsistent EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed hfsplus: session requires an argument hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option EXT4-fs (loop2): blocks per group (1392640000) and clusters per group (16384) inconsistent hfsplus: unable to parse mount options hfsplus: session requires an argument EXT4-fs (loop1): Ignoring removed oldalloc option hfsplus: unable to parse mount options EXT4-fs (loop2): Ignoring removed oldalloc option hfsplus: unable to parse mount options EXT4-fs (loop2): blocks per group (1392705536) and clusters per group (16384) inconsistent EXT4-fs error (device loop1): ext4_ext_check_inode:498: inode #2: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed