IRQs not enabled as expected __should_failslab+0x124/0x180 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1578 slab_pre_alloc_hook mm/slab.h:423 [inline] slab_alloc mm/slab.c:3378 [inline] __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x70/0x760 mm/slab.c:3731 WARNING: CPU: 1 PID: 3499 at fs/eventpoll.c:682 ep_scan_ready_list+0xc78/0x1050 fs/eventpoll.c:682 Kernel panic - not syncing: panic_on_warn set ... kmalloc include/linux/slab.h:551 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline] __tty_buffer_request_room+0x2da/0x810 drivers/tty/tty_buffer.c:273 tty_insert_flip_string_fixed_flag+0x88/0x1f0 drivers/tty/tty_buffer.c:318 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x12c/0x1f0 drivers/tty/pty.c:122 tty_put_char+0x137/0x160 drivers/tty/tty_io.c:3013 __process_echoes+0x456/0x9b0 drivers/tty/n_tty.c:726 flush_echoes drivers/tty/n_tty.c:827 [inline] __receive_buf drivers/tty/n_tty.c:1646 [inline] n_tty_receive_buf_common+0x11bf/0x2cb0 drivers/tty/n_tty.c:1740 n_tty_receive_buf+0x30/0x40 drivers/tty/n_tty.c:1769 tiocsti drivers/tty/tty_io.c:2177 [inline] tty_ioctl+0x7cc/0x17d0 drivers/tty/tty_io.c:2553 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f03883a2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f03883a2c90 RCX: 0000000000457569 RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000006 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f03883a36d4 R13: 00000000004c0ff1 R14: 00000000004d1c88 R15: 0000000000000007 CPU: 1 PID: 3499 Comm: udevd Not tainted 4.19.0+ #90 ====================================================== WARNING: possible circular locking dependency detected 4.19.0+ #90 Not tainted ------------------------------------------------------ syz-executor0/8210 is trying to acquire lock: 00000000982af96e (console_owner){-.-.}, at: log_next kernel/printk/printk.c:492 [inline] 00000000982af96e (console_owner){-.-.}, at: console_unlock+0x570/0x1190 kernel/printk/printk.c:2402 but task is already holding lock: 00000000b4f26c33 (&(&port->lock)->rlock){-.-.}, at: pty_write+0xf9/0x1f0 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){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 tty_port_tty_get+0x20/0x80 drivers/tty/tty_port.c:287 tty_port_default_wakeup+0x15/0x40 drivers/tty/tty_port.c:47 tty_port_tty_wakeup+0x5d/0x70 drivers/tty/tty_port.c:387 uart_write_wakeup+0x44/0x60 drivers/tty/serial/serial_core.c:103 serial8250_tx_chars+0x4be/0xb60 drivers/tty/serial/8250/8250_port.c:1825 serial8250_handle_irq.part.23+0x1ee/0x280 drivers/tty/serial/8250/8250_port.c:1898 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1884 [inline] serial8250_default_handle_irq+0xc8/0x150 drivers/tty/serial/8250/8250_port.c:1914 serial8250_interrupt+0xef/0x190 drivers/tty/serial/8250/8250_core.c:125 __handle_irq_event_percpu+0x195/0xb30 kernel/irq/handle.c:149 handle_irq_event_percpu+0xa0/0x1d0 kernel/irq/handle.c:189 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x227/0x880 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:154 [inline] handle_irq+0x252/0x3d8 arch/x86/kernel/irq_64.c:78 do_IRQ+0x98/0x1c0 arch/x86/kernel/irq.c:246 ret_from_intr+0x0/0x1e native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57 arch_safe_halt arch/x86/include/asm/paravirt.h:151 [inline] default_idle+0xbf/0x490 arch/x86/kernel/process.c:498 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x49b/0x5c0 kernel/sched/idle.c:262 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:353 rest_init+0x243/0x372 init/main.c:442 arch_call_rest_init+0xe/0x1b start_kernel+0xa1f/0xa5a init/main.c:744 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:472 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #1 (&port_lock_key){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 serial8250_console_write+0x8e8/0xb10 drivers/tty/serial/8250/8250_port.c:3266 univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:586 call_console_drivers kernel/printk/printk.c:1729 [inline] console_unlock+0xb1f/0x1190 kernel/printk/printk.c:2415 vprintk_emit+0x391/0x990 kernel/printk/printk.c:1923 vprintk_default+0x28/0x30 kernel/printk/printk.c:1965 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1998 register_console+0x8df/0xcf0 kernel/printk/printk.c:2730 univ8250_console_init+0x3f/0x4b drivers/tty/serial/8250/8250_core.c:681 console_init+0x6ac/0x9dc kernel/printk/printk.c:2816 start_kernel+0x73a/0xa5a init/main.c:666 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:472 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #0 (console_owner){-.-.}: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844 console_lock_spinning_enable kernel/printk/printk.c:1592 [inline] console_unlock+0x5dd/0x1190 kernel/printk/printk.c:2412 vprintk_emit+0x391/0x990 kernel/printk/printk.c:1923 vprintk_default+0x28/0x30 kernel/printk/printk.c:1965 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1998 fail_dump lib/fault-inject.c:44 [inline] should_fail+0xac1/0xd01 lib/fault-inject.c:149 __should_failslab+0x124/0x180 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1578 slab_pre_alloc_hook mm/slab.h:423 [inline] slab_alloc mm/slab.c:3378 [inline] __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x70/0x760 mm/slab.c:3731 kmalloc include/linux/slab.h:551 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline] __tty_buffer_request_room+0x2da/0x810 drivers/tty/tty_buffer.c:273 tty_insert_flip_string_fixed_flag+0x88/0x1f0 drivers/tty/tty_buffer.c:318 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x12c/0x1f0 drivers/tty/pty.c:122 tty_put_char+0x137/0x160 drivers/tty/tty_io.c:3013 __process_echoes+0x456/0x9b0 drivers/tty/n_tty.c:726 flush_echoes drivers/tty/n_tty.c:827 [inline] __receive_buf drivers/tty/n_tty.c:1646 [inline] n_tty_receive_buf_common+0x11bf/0x2cb0 drivers/tty/n_tty.c:1740 n_tty_receive_buf+0x30/0x40 drivers/tty/n_tty.c:1769 tiocsti drivers/tty/tty_io.c:2177 [inline] tty_ioctl+0x7cc/0x17d0 drivers/tty/tty_io.c:2553 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 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 *** 5 locks held by syz-executor0/8210: #0: 000000002e55b9fd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000006c9db227 (&o_tty->termios_rwsem/1){++++}, at: n_tty_receive_buf_common+0xeb/0x2cb0 drivers/tty/n_tty.c:1703 #2: 00000000cb9b1b5d (&ldata->output_lock){+.+.}, at: flush_echoes drivers/tty/n_tty.c:825 [inline] #2: 00000000cb9b1b5d (&ldata->output_lock){+.+.}, at: __receive_buf drivers/tty/n_tty.c:1646 [inline] #2: 00000000cb9b1b5d (&ldata->output_lock){+.+.}, at: n_tty_receive_buf_common+0x1187/0x2cb0 drivers/tty/n_tty.c:1740 #3: 00000000b4f26c33 (&(&port->lock)->rlock){-.-.}, at: pty_write+0xf9/0x1f0 drivers/tty/pty.c:120 #4: 00000000f2db8d86 (console_lock){+.+.}, at: console_trylock_spinning kernel/printk/printk.c:1654 [inline] #4: 00000000f2db8d86 (console_lock){+.+.}, at: vprintk_emit+0x372/0x990 kernel/printk/printk.c:1922 stack backtrace: CPU: 0 PID: 8210 Comm: syz-executor0 Not tainted 4.19.0+ #90 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+0x244/0x39d lib/dump_stack.c:113 print_circular_bug.isra.35.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2347 [inline] __lock_acquire+0x3399/0x4c20 kernel/locking/lockdep.c:3341 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844 console_lock_spinning_enable kernel/printk/printk.c:1592 [inline] console_unlock+0x5dd/0x1190 kernel/printk/printk.c:2412 vprintk_emit+0x391/0x990 kernel/printk/printk.c:1923 vprintk_default+0x28/0x30 kernel/printk/printk.c:1965 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1998 fail_dump lib/fault-inject.c:44 [inline] should_fail+0xac1/0xd01 lib/fault-inject.c:149 __should_failslab+0x124/0x180 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1578 slab_pre_alloc_hook mm/slab.h:423 [inline] slab_alloc mm/slab.c:3378 [inline] __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x70/0x760 mm/slab.c:3731 kmalloc include/linux/slab.h:551 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline] __tty_buffer_request_room+0x2da/0x810 drivers/tty/tty_buffer.c:273 tty_insert_flip_string_fixed_flag+0x88/0x1f0 drivers/tty/tty_buffer.c:318 tty_insert_flip_string include/linux/tty_flip.h:37 [inline] pty_write+0x12c/0x1f0 drivers/tty/pty.c:122 tty_put_char+0x137/0x160 drivers/tty/tty_io.c:3013 __process_echoes+0x456/0x9b0 drivers/tty/n_tty.c:726 flush_echoes drivers/tty/n_tty.c:827 [inline] __receive_buf drivers/tty/n_tty.c:1646 [inline] n_tty_receive_buf_common+0x11bf/0x2cb0 drivers/tty/n_tty.c:1740 n_tty_receive_buf+0x30/0x40 drivers/tty/n_tty.c:1769 tiocsti drivers/tty/tty_io.c:2177 [inline] tty_ioctl+0x7cc/0x17d0 drivers/tty/tty_io.c:2553 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f03883a2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f03883a2c90 RCX: 0000000000457569 RDX: 0000000020000040 Lost 3 message(s)! kernel msg: ebtables bug: please report to author: Valid hook without chain Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 vim2m vim2m.0: vidioc_s_fmt queue busy Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 vim2m vim2m.0: vidioc_s_fmt queue busy panic+0x238/0x4e7 kernel/panic.c:184 __warn.cold.8+0x20/0x4a kernel/panic.c:536 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:966 RIP: 0010:ep_scan_ready_list+0xc78/0x1050 fs/eventpoll.c:682 Code: ff 44 89 fe e8 39 0a 9a ff 45 84 ff 0f 85 ac f5 ff ff e8 5b 09 9a ff 48 c7 c7 40 c7 35 88 c6 05 c4 cb 2b 08 01 e8 a8 78 63 ff <0f> 0b e9 8d f5 ff ff e8 3c 09 9a ff 48 8d 7b 50 48 89 f8 48 c1 e8 RSP: 0018:ffff8801c549f668 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffffffff81e5a010 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8165c855 RDI: 0000000000000005 RBP: ffff8801c549f990 R08: ffff8801c5494500 R09: fffffbfff12b2160 R10: fffffbfff12b2160 R11: ffffffff89590b03 R12: ffff8801c549f968 R13: ffff8801c549fb28 R14: 0000000000000000 R15: 0000000000000000 ep_send_events fs/eventpoll.c:1713 [inline] ep_poll+0x572/0x13d0 fs/eventpoll.c:1840 do_epoll_wait+0x1b0/0x200 fs/eventpoll.c:2198 __do_sys_epoll_wait fs/eventpoll.c:2208 [inline] __se_sys_epoll_wait fs/eventpoll.c:2205 [inline] __x64_sys_epoll_wait+0x97/0xf0 fs/eventpoll.c:2205 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f77b7804943 Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24 RSP: 002b:00007ffca892da38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007f77b7804943 RDX: 0000000000000008 RSI: 00007ffca892db30 RDI: 000000000000000a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 000000000186d100 R15: 0000000001853030 Kernel Offset: disabled Rebooting in 86400 seconds..