====================================================== WARNING: possible circular locking dependency detected 5.17.0-rc5-next-20220222-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/3941 is trying to acquire lock: ffff8880b9c395d8 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x366/0x1140 kernel/workqueue.c:1474 but task is already holding lock: ffffffff9061a530 (&port_lock_key){-.-.}-{2:2}, at: serial8250_handle_irq.part.0+0x21/0x3d0 drivers/tty/serial/8250/8250_port.c:1916 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&port_lock_key){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 serial8250_console_write+0x91a/0xb70 drivers/tty/serial/8250/8250_port.c:3359 call_console_drivers kernel/printk/printk.c:1953 [inline] console_unlock+0x9bc/0xdd0 kernel/printk/printk.c:2775 vprintk_emit+0x1b4/0x5f0 kernel/printk/printk.c:2273 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50 _printk+0xba/0xed kernel/printk/printk.c:2294 register_console kernel/printk/printk.c:3132 [inline] register_console+0x410/0x7c0 kernel/printk/printk.c:3013 univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:679 console_init+0x3c1/0x58d kernel/printk/printk.c:3232 start_kernel+0x30b/0x4a0 init/main.c:1068 secondary_startup_64_no_verify+0xc3/0xcb -> #1 (console_owner){....}-{0:0}: console_lock_spinning_enable kernel/printk/printk.c:1795 [inline] console_unlock+0x3b1/0xdd0 kernel/printk/printk.c:2772 vprintk_emit+0x1b4/0x5f0 kernel/printk/printk.c:2273 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50 _printk+0xba/0xed kernel/printk/printk.c:2294 warn_flush_attempt kernel/workqueue.c:2613 [inline] check_flush_dependency.cold+0x18/0x4e kernel/workqueue.c:2635 start_flush_work kernel/workqueue.c:3049 [inline] __flush_work+0x25a/0xb10 kernel/workqueue.c:3091 flush_all_cpus_locked+0x148/0x1b0 mm/slub.c:2728 flush_all mm/slub.c:2737 [inline] __kmem_cache_shrink+0x11/0x20 mm/slub.c:4640 acpi_os_purge_cache+0x11/0x20 drivers/acpi/osl.c:1666 acpi_purge_cached_objects+0x37/0xd0 drivers/acpi/acpica/utxface.c:237 acpi_initialize_objects+0x2b/0x95 drivers/acpi/acpica/utxfinit.c:250 acpi_bus_init drivers/acpi/bus.c:1237 [inline] acpi_init+0x1d2/0x976 drivers/acpi/bus.c:1325 do_one_initcall+0x103/0x650 init/main.c:1302 do_initcall_level init/main.c:1375 [inline] do_initcalls init/main.c:1391 [inline] do_basic_setup init/main.c:1410 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1615 kernel_init+0x1a/0x1d0 init/main.c:1504 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #0 (&pool->lock){-.-.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3096 [inline] check_prevs_add kernel/locking/lockdep.c:3219 [inline] validate_chain kernel/locking/lockdep.c:3834 [inline] __lock_acquire+0x2ac6/0x56c0 kernel/locking/lockdep.c:5060 lock_acquire kernel/locking/lockdep.c:5672 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5637 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 __queue_work+0x366/0x1140 kernel/workqueue.c:1474 queue_work_on+0xee/0x110 kernel/workqueue.c:1545 uart_handle_dcd_change+0x1e1/0x2b0 drivers/tty/serial/serial_core.c:3090 serial8250_modem_status+0x277/0x2c0 drivers/tty/serial/8250/8250_port.c:1880 serial8250_handle_irq.part.0+0xa1/0x3d0 drivers/tty/serial/8250/8250_port.c:1937 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1913 [inline] serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1957 serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126 __handle_irq_event_percpu+0x22b/0x880 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:817 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250 common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629 kasan_check_range+0x12/0x180 mm/kasan/generic.c:188 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:1265 [inline] prb_read kernel/printk/printk_ringbuffer.c:1808 [inline] _prb_read_valid+0x18d/0x710 kernel/printk/printk_ringbuffer.c:1891 prb_read_valid+0x75/0xa0 kernel/printk/printk_ringbuffer.c:1940 console_unlock+0x1d6/0xdd0 kernel/printk/printk.c:2714 do_con_write+0xc6c/0x1e40 drivers/tty/vt/vt.c:2965 con_put_char+0x70/0xa0 drivers/tty/vt/vt.c:3303 tty_put_char+0xb7/0x150 drivers/tty/tty_io.c:3143 do_output_char+0x155/0x850 drivers/tty/n_tty.c:476 process_output drivers/tty/n_tty.c:501 [inline] n_tty_write+0x4c3/0xfd0 drivers/tty/n_tty.c:2260 do_tty_write drivers/tty/tty_io.c:1024 [inline] file_tty_write.constprop.0+0x526/0x910 drivers/tty/tty_io.c:1095 call_write_iter include/linux/fs.h:2095 [inline] new_sync_write+0x431/0x660 fs/read_write.c:504 vfs_write+0x7c9/0xad0 fs/read_write.c:591 ksys_write+0x12d/0x250 fs/read_write.c:644 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: &pool->lock --> console_owner --> &port_lock_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&port_lock_key); lock(console_owner); lock(&port_lock_key); lock(&pool->lock); *** DEADLOCK *** 8 locks held by syz-executor.3/3941: #0: ffff88801caa4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffff88801caa4130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:950 [inline] #1: ffff88801caa4130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:973 [inline] #1: ffff88801caa4130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x29f/0x910 drivers/tty/tty_io.c:1095 #2: ffff88801caa42e8 (&tty->termios_rwsem){++++}-{3:3}, at: n_tty_write+0x1bf/0xfd0 drivers/tty/n_tty.c:2231 #3: ffffc90002158378 (&ldata->output_lock){+.+.}-{3:3}, at: process_output drivers/tty/n_tty.c:498 [inline] #3: ffffc90002158378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_write+0x4ae/0xfd0 drivers/tty/n_tty.c:2260 #4: ffffffff8bb75180 (console_lock){+.+.}-{0:0}, at: do_con_write+0x10f/0x1e40 drivers/tty/vt/vt.c:2908 #5: ffff88807a8b92b0 (&i->lock){-.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] #5: ffff88807a8b92b0 (&i->lock){-.-.}-{2:2}, at: serial8250_interrupt+0x3a/0x200 drivers/tty/serial/8250/8250_core.c:116 #6: ffffffff9061a530 (&port_lock_key){-.-.}-{2:2}, at: serial8250_handle_irq.part.0+0x21/0x3d0 drivers/tty/serial/8250/8250_port.c:1916 #7: ffffffff8bb866a0 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xd0/0x1140 kernel/workqueue.c:1437 stack backtrace: CPU: 0 PID: 3941 Comm: syz-executor.3 Not tainted 5.17.0-rc5-next-20220222-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2176 check_prev_add kernel/locking/lockdep.c:3096 [inline] check_prevs_add kernel/locking/lockdep.c:3219 [inline] validate_chain kernel/locking/lockdep.c:3834 [inline] __lock_acquire+0x2ac6/0x56c0 kernel/locking/lockdep.c:5060 lock_acquire kernel/locking/lockdep.c:5672 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5637 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 __queue_work+0x366/0x1140 kernel/workqueue.c:1474 queue_work_on+0xee/0x110 kernel/workqueue.c:1545 uart_handle_dcd_change+0x1e1/0x2b0 drivers/tty/serial/serial_core.c:3090 serial8250_modem_status+0x277/0x2c0 drivers/tty/serial/8250/8250_port.c:1880 serial8250_handle_irq.part.0+0xa1/0x3d0 drivers/tty/serial/8250/8250_port.c:1937 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1913 [inline] serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1957 serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126 __handle_irq_event_percpu+0x22b/0x880 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:817 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250 common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629 RIP: 0010:check_region_inline mm/kasan/generic.c:172 [inline] RIP: 0010:kasan_check_range+0x12/0x180 mm/kasan/generic.c:189 Code: 0c e8 02 e5 ff ff 89 43 08 5b 5d 41 5c c3 66 2e 0f 1f 84 00 00 00 00 00 48 85 f6 0f 84 3c 01 00 00 49 89 f9 41 54 44 0f b6 c2 <49> 01 f1 55 53 0f 82 18 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 RSP: 0018:ffffc900020cf4d0 EFLAGS: 00000202 RAX: ffffffff8bb44ec0 RBX: ffffc900020cf5b0 RCX: ffffffff8160572d RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8bb53650 RBP: ffffffff8bac9fb0 R08: 0000000000000000 R09: ffffffff8bb53650 R10: ffffffff816056ca R11: 0000000000000000 R12: ffffffff8bb53650 R13: 000000000000000d R14: 00000000000009a6 R15: ffffffff8ba94e20 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:1265 [inline] prb_read kernel/printk/printk_ringbuffer.c:1808 [inline] _prb_read_valid+0x18d/0x710 kernel/printk/printk_ringbuffer.c:1891 prb_read_valid+0x75/0xa0 kernel/printk/printk_ringbuffer.c:1940 console_unlock+0x1d6/0xdd0 kernel/printk/printk.c:2714 do_con_write+0xc6c/0x1e40 drivers/tty/vt/vt.c:2965 con_put_char+0x70/0xa0 drivers/tty/vt/vt.c:3303 tty_put_char+0xb7/0x150 drivers/tty/tty_io.c:3143 do_output_char+0x155/0x850 drivers/tty/n_tty.c:476 process_output drivers/tty/n_tty.c:501 [inline] n_tty_write+0x4c3/0xfd0 drivers/tty/n_tty.c:2260 do_tty_write drivers/tty/tty_io.c:1024 [inline] file_tty_write.constprop.0+0x526/0x910 drivers/tty/tty_io.c:1095 call_write_iter include/linux/fs.h:2095 [inline] new_sync_write+0x431/0x660 fs/read_write.c:504 vfs_write+0x7c9/0xad0 fs/read_write.c:591 ksys_write+0x12d/0x250 fs/read_write.c:644 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb18cc89059 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb18ded9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fb18cd9bf60 RCX: 00007fb18cc89059 RDX: 000000000000010c RSI: 0000000020000180 RDI: 0000000000000003 RBP: 00007fb18cce308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe748c1bdf R14: 00007fb18ded9300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 02 e5 ff ff callq 0xffffe507 5: 89 43 08 mov %eax,0x8(%rbx) 8: 5b pop %rbx 9: 5d pop %rbp a: 41 5c pop %r12 c: c3 retq d: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 14: 00 00 00 17: 48 85 f6 test %rsi,%rsi 1a: 0f 84 3c 01 00 00 je 0x15c 20: 49 89 f9 mov %rdi,%r9 23: 41 54 push %r12 25: 44 0f b6 c2 movzbl %dl,%r8d * 29: 49 01 f1 add %rsi,%r9 <-- trapping instruction 2c: 55 push %rbp 2d: 53 push %rbx 2e: 0f 82 18 01 00 00 jb 0x14c 34: 48 b8 ff ff ff ff ff movabs $0xffff7fffffffffff,%rax 3b: 7f ff ff 3e: 48 rex.W