RBP: 00007f28410e41d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff374107cf R14: 00007f28410e4300 R15: 0000000000022000
======================================================
WARNING: possible circular locking dependency detected
5.10.96 #1 Not tainted
------------------------------------------------------
syz-executor.2/48713 is trying to acquire lock:
ffffffff84d0ac00 (console_owner){-.-.}-{0:0}, at: console_unlock+0x2e1/0xb30 kernel/printk/printk.c:2505
but task is already holding lock:
ffff888050c2d358 (&sighand->siglock){..-.}-{2:2}, at: __lock_task_sighand+0xd3/0x2f0 kernel/signal.c:1391
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&sighand->siglock){..-.}-{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
__lock_task_sighand+0xd3/0x2f0 kernel/signal.c:1391
lock_task_sighand include/linux/sched/signal.h:693 [inline]
task_work_add+0x1db/0x2b0 kernel/task_work.c:58
io_req_task_work_add fs/io_uring.c:2052 [inline]
__io_async_wake+0x40b/0x8d0 fs/io_uring.c:4964
__wake_up_common+0x14c/0x4c0 kernel/sched/wait.c:93
__wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:123
tty_ldisc_lock+0x40/0xb0 drivers/tty/tty_ldisc.c:335
tty_ldisc_hangup+0x204/0x690 drivers/tty/tty_ldisc.c:744
__tty_hangup.part.0+0x510/0x9b0 drivers/tty/tty_io.c:624
__tty_hangup drivers/tty/tty_io.c:574 [inline]
tty_vhangup drivers/tty/tty_io.c:697 [inline]
tty_ioctl+0x120e/0x1830 drivers/tty/tty_io.c:2683
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
-> #3 (&tty->read_wait){....}-{2:2}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x27/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:354 [inline]
io_poll_double_wake+0x1f8/0x550 fs/io_uring.c:5077
__wake_up_common+0x14c/0x4c0 kernel/sched/wait.c:93
__wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:123
tty_ldisc_lock+0x55/0xb0 drivers/tty/tty_ldisc.c:336
tty_ldisc_hangup+0x204/0x690 drivers/tty/tty_ldisc.c:744
__tty_hangup.part.0+0x510/0x9b0 drivers/tty/tty_io.c:624
__tty_hangup drivers/tty/tty_io.c:574 [inline]
tty_vhangup drivers/tty/tty_io.c:697 [inline]
tty_ioctl+0x120e/0x1830 drivers/tty/tty_io.c:2683
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x196/0x210 fs/ioctl.c:739
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
-> #2 (&tty->write_wait){-.-.}-{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
__wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:122
tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:50
serial8250_tx_chars+0x516/0xb40 drivers/tty/serial/8250/8250_port.c:1851
serial8250_handle_irq.part.0+0x3f1/0x4c0 drivers/tty/serial/8250/8250_port.c:1938
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1911 [inline]
serial8250_default_handle_irq+0xb8/0x230 drivers/tty/serial/8250/8250_port.c:1954
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_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
default_idle+0xe/0x10 arch/x86/kernel/process.c:689
default_idle_call+0x87/0xd0 kernel/sched/idle.c:112
cpuidle_idle_call kernel/sched/idle.c:194 [inline]
do_idle+0x3a9/0x520 kernel/sched/idle.c:300
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396
secondary_startup_64_no_verify+0xc2/0xcb
-> #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+0x8dd/0xb20 drivers/tty/serial/8250/8250_port.c:3330
call_console_drivers kernel/printk/printk.c:1909 [inline]
console_unlock+0x826/0xb30 kernel/printk/printk.c:2530
register_console kernel/printk/printk.c:2871 [inline]
register_console+0x53d/0x800 kernel/printk/printk.c:2761
univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:690
console_init+0x361/0x4fa kernel/printk/printk.c:2981
start_kernel+0x2f2/0x49b init/main.c:985
secondary_startup_64_no_verify+0xc2/0xcb
-> #0 (console_owner){-.-.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:2986 [inline]
check_prevs_add kernel/locking/lockdep.c:3111 [inline]
validate_chain kernel/locking/lockdep.c:3726 [inline]
__lock_acquire+0x29e3/0x5b00 kernel/locking/lockdep.c:4952
lock_acquire kernel/locking/lockdep.c:5562 [inline]
lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5527
console_lock_spinning_enable kernel/printk/printk.c:1761 [inline]
console_unlock+0x360/0xb30 kernel/printk/printk.c:2527
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+0x472/0x5a0 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:2821 [inline]
slab_alloc mm/slub.c:2904 [inline]
kmem_cache_alloc+0x5b/0x350 mm/slub.c:2909
__sigqueue_alloc+0x1ee/0x560 kernel/signal.c:435
__send_signal+0x5db/0x1040 kernel/signal.c:1116
do_send_sig_info kernel/signal.c:1291 [inline]
send_sig_info kernel/signal.c:1606 [inline]
send_sig+0xcb/0x160 kernel/signal.c:1616
sk_stream_error+0xaa/0x100 net/core/stream.c:188
tcp_sendmsg_locked+0x1633/0x2f10 net/ipv4/tcp.c:1432
tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1447
inet6_sendmsg+0xb5/0x140 net/ipv6/af_inet6.c:638
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xee/0x190 net/socket.c:671
____sys_sendmsg+0x709/0x870 net/socket.c:2342
___sys_sendmsg+0xf3/0x170 net/socket.c:2396
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2429
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 --> &tty->read_wait --> &sighand->siglock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sighand->siglock);
lock(&tty->read_wait);
lock(&sighand->siglock);
lock(console_owner);
*** DEADLOCK ***
3 locks held by syz-executor.2/48713:
#0: ffff88800d5b3fa0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1583 [inline]
#0: ffff88800d5b3fa0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_sendmsg+0x1d/0x40 net/ipv4/tcp.c:1446
#1: ffff888050c2d358 (&sighand->siglock){..-.}-{2:2}, at: __lock_task_sighand+0xd3/0x2f0 kernel/signal.c:1391
#2: ffffffff84deaf80 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401
stack backtrace:
CPU: 0 PID: 48713 Comm: syz-executor.2 Not tainted 5.10.96 #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+0x25f/0x2e0 kernel/locking/lockdep.c:2121
check_prev_add kernel/locking/lockdep.c:2986 [inline]
check_prevs_add kernel/locking/lockdep.c:3111 [inline]
validate_chain kernel/locking/lockdep.c:3726 [inline]
__lock_acquire+0x29e3/0x5b00 kernel/locking/lockdep.c:4952
lock_acquire kernel/locking/lockdep.c:5562 [inline]
lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5527
console_lock_spinning_enable kernel/printk/printk.c:1761 [inline]
console_unlock+0x360/0xb30 kernel/printk/printk.c:2527
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+0x472/0x5a0 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:2821 [inline]
slab_alloc mm/slub.c:2904 [inline]
kmem_cache_alloc+0x5b/0x350 mm/slub.c:2909
__sigqueue_alloc+0x1ee/0x560 kernel/signal.c:435
__send_signal+0x5db/0x1040 kernel/signal.c:1116
do_send_sig_info kernel/signal.c:1291 [inline]
send_sig_info kernel/signal.c:1606 [inline]
send_sig+0xcb/0x160 kernel/signal.c:1616
sk_stream_error+0xaa/0x100 net/core/stream.c:188
tcp_sendmsg_locked+0x1633/0x2f10 net/ipv4/tcp.c:1432
tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1447
inet6_sendmsg+0xb5/0x140 net/ipv6/af_inet6.c:638
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xee/0x190 net/socket.c:671
____sys_sendmsg+0x709/0x870 net/socket.c:2342
___sys_sendmsg+0xf3/0x170 net/socket.c:2396
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2429
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f2843b6eb19
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:00007f28410e4188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2843c81f60 RCX: 00007f2843b6eb19
RDX: 0000000000000000 RSI: 0000000020000800 RDI: 0000000000000003
RBP: 00007f28410e41d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff374107cf R14: 00007f28410e4300 R15: 0000000000022000