=====================================================
WARNING: SOFTIRQ-READ-safe -> SOFTIRQ-READ-unsafe lock order detected
6.11.0-rc7-syzkaller-00097-g196145c606d0 #0 Not tainted
-----------------------------------------------------
syz.3.10439/19895 [HC0[0]:SC0[4]:HE1:SE0] is trying to acquire:
ffff8880673ace10 (&ppp->rlock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff8880673ace10 (&ppp->rlock){+...}-{2:2}, at: ppp_disconnect_channel+0x9a/0x2d0 drivers/net/ppp/ppp_generic.c:3528
and this task is already holding:
ffff8880673ace50 (&ppp->wlock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff8880673ace50 (&ppp->wlock){+...}-{2:2}, at: ppp_disconnect_channel+0x88/0x2d0 drivers/net/ppp/ppp_generic.c:3528
which would create a new lock dependency:
(&ppp->wlock){+...}-{2:2} -> (&ppp->rlock){+...}-{2:2}
but this new dependency connects a SOFTIRQ-READ-irq-safe lock:
(&pch->upl){++.-}-{2:2}
... which became SOFTIRQ-READ-irq-safe at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline]
_raw_read_lock_bh+0x3d/0x50 kernel/locking/spinlock.c:252
ppp_input+0x3dc/0xa10 drivers/net/ppp/ppp_generic.c:2307
pppoe_rcv_core+0x117/0x310 drivers/net/ppp/pppoe.c:379
sk_backlog_rcv include/net/sock.h:1111 [inline]
__sk_receive_skb+0x82b/0x8b0 net/core/sock.c:569
__netif_receive_skb_one_core net/core/dev.c:5661 [inline]
__netif_receive_skb+0x2e0/0x650 net/core/dev.c:5775
process_backlog+0x662/0x15b0 net/core/dev.c:6108
__napi_poll+0xcb/0x490 net/core/dev.c:6772
napi_poll net/core/dev.c:6841 [inline]
net_rx_action+0x89b/0x1240 net/core/dev.c:6963
handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
do_softirq+0x11b/0x1e0 kernel/softirq.c:455
__local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
___sys_sendmsg net/socket.c:2651 [inline]
__sys_sendmmsg+0x3b2/0x740 net/socket.c:2737
__do_sys_sendmmsg net/socket.c:2766 [inline]
__se_sys_sendmmsg net/socket.c:2763 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
to a SOFTIRQ-READ-irq-unsafe lock:
(&pch->downl){+.+.}-{2:2}
... which became SOFTIRQ-READ-irq-unsafe at:
...
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]
ppp_input+0x18b/0xa10 drivers/net/ppp/ppp_generic.c:2304
pppoe_rcv_core+0x117/0x310 drivers/net/ppp/pppoe.c:379
sk_backlog_rcv include/net/sock.h:1111 [inline]
__release_sock+0x243/0x350 net/core/sock.c:3004
release_sock+0x61/0x1f0 net/core/sock.c:3558
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
___sys_sendmsg net/socket.c:2651 [inline]
__sys_sendmmsg+0x3b2/0x740 net/socket.c:2737
__do_sys_sendmmsg net/socket.c:2766 [inline]
__se_sys_sendmmsg net/socket.c:2763 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&pch->upl --> &ppp->wlock --> &pch->downl
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&pch->downl);
local_irq_disable();
lock(&pch->upl);
lock(&ppp->wlock);
<Interrupt>
lock(&pch->upl);
*** DEADLOCK ***
3 locks held by syz.3.10439/19895:
#0: ffff88803385c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:289 [inline]
#0: ffff88803385c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock_pair_timeout drivers/tty/tty_ldisc.c:335 [inline]
#0: ffff88803385c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock_pair drivers/tty/tty_ldisc.c:366 [inline]
#0: ffff88803385c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_release+0x5c/0x200 drivers/tty/tty_ldisc.c:780
#1: ffff88805f78e0a0 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: __tty_ldisc_lock_nested drivers/tty/tty_ldisc.c:295 [inline]
#1: ffff88805f78e0a0 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_lock_pair_timeout drivers/tty/tty_ldisc.c:337 [inline]
#1: ffff88805f78e0a0 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_lock_pair drivers/tty/tty_ldisc.c:366 [inline]
#1: ffff88805f78e0a0 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_release+0x80/0x200 drivers/tty/tty_ldisc.c:780
#2: ffff8880673ace50 (&ppp->wlock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff8880673ace50 (&ppp->wlock){+...}-{2:2}, at: ppp_disconnect_channel+0x88/0x2d0 drivers/net/ppp/ppp_generic.c:3528
the dependencies between SOFTIRQ-READ-irq-safe lock and the holding lock:
-> (&pch->upl){++.-}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline]
_raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334
ppp_disconnect_channel+0x2f/0x2d0 drivers/net/ppp/ppp_generic.c:3522
ppp_unregister_channel+0xb9/0x300 drivers/net/ppp/ppp_generic.c:2996
ppp_sync_close+0xf4/0x160 drivers/net/ppp/ppp_synctty.c:236
tty_set_ldisc+0x35d/0x560 drivers/tty/tty_ldisc.c:557
tty_ioctl+0xbdc/0xdc0 drivers/tty/tty_io.c:2739
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
HARDIRQ-ON-R at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline]
_raw_read_lock_bh+0x3d/0x50 kernel/locking/spinlock.c:252
ppp_input+0x3dc/0xa10 drivers/net/ppp/ppp_generic.c:2307
pppoe_rcv_core+0x117/0x310 drivers/net/ppp/pppoe.c:379
sk_backlog_rcv include/net/sock.h:1111 [inline]
__release_sock+0x243/0x350 net/core/sock.c:3004
release_sock+0x61/0x1f0 net/core/sock.c:3558
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
___sys_sendmsg net/socket.c:2651 [inline]
__sys_sendmmsg+0x3b2/0x740 net/socket.c:2737
__do_sys_sendmmsg net/socket.c:2766 [inline]
__se_sys_sendmmsg net/socket.c:2763 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
IN-SOFTIRQ-R at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline]
_raw_read_lock_bh+0x3d/0x50 kernel/locking/spinlock.c:252
ppp_input+0x3dc/0xa10 drivers/net/ppp/ppp_generic.c:2307
pppoe_rcv_core+0x117/0x310 drivers/net/ppp/pppoe.c:379
sk_backlog_rcv include/net/sock.h:1111 [inline]
__sk_receive_skb+0x82b/0x8b0 net/core/sock.c:569
__netif_receive_skb_one_core net/core/dev.c:5661 [inline]
__netif_receive_skb+0x2e0/0x650 net/core/dev.c:5775
process_backlog+0x662/0x15b0 net/core/dev.c:6108
__napi_poll+0xcb/0x490 net/core/dev.c:6772
napi_poll net/core/dev.c:6841 [inline]
net_rx_action+0x89b/0x1240 net/core/dev.c:6963
handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
do_softirq+0x11b/0x1e0 kernel/softirq.c:455
__local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
___sys_sendmsg net/socket.c:2651 [inline]
__sys_sendmmsg+0x3b2/0x740 net/socket.c:2737
__do_sys_sendmmsg net/socket.c:2766 [inline]
__se_sys_sendmmsg net/socket.c:2763 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline]
_raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334
ppp_disconnect_channel+0x2f/0x2d0 drivers/net/ppp/ppp_generic.c:3522
ppp_unregister_channel+0xb9/0x300 drivers/net/ppp/ppp_generic.c:2996
ppp_sync_close+0xf4/0x160 drivers/net/ppp/ppp_synctty.c:236
tty_set_ldisc+0x35d/0x560 drivers/tty/tty_ldisc.c:557
tty_ioctl+0xbdc/0xdc0 drivers/tty/tty_io.c:2739
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL READ USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline]
_raw_read_lock_bh+0x3d/0x50 kernel/locking/spinlock.c:252
ppp_input+0x3dc/0xa10 drivers/net/ppp/ppp_generic.c:2307
pppoe_rcv_core+0x117/0x310 drivers/net/ppp/pppoe.c:379
sk_backlog_rcv include/net/sock.h:1111 [inline]
__release_sock+0x243/0x350 net/core/sock.c:3004
release_sock+0x61/0x1f0 net/core/sock.c:3558
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
___sys_sendmsg net/socket.c:2651 [inline]
__sys_sendmmsg+0x3b2/0x740 net/socket.c:2737
__do_sys_sendmmsg net/socket.c:2766 [inline]
__se_sys_sendmmsg net/socket.c:2763 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
}
... key at: [<ffffffff9a68b1a0>] ppp_register_net_channel.__key.3+0x0/0x20
-> (&ppp->wlock){+...}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_get_stats64+0xc3/0x290 drivers/net/ppp/ppp_generic.c:1539
dev_get_stats+0xad/0xa00 net/core/dev.c:10894
rtnl_fill_stats+0x47/0x880 net/core/rtnetlink.c:1268
rtnl_fill_ifinfo+0x18da/0x2270 net/core/rtnetlink.c:1909
rtmsg_ifinfo_build_skb+0x18a/0x260 net/core/rtnetlink.c:4079
rtmsg_ifinfo_event net/core/rtnetlink.c:4113 [inline]
rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4122
register_netdevice+0x1774/0x1b00 net/core/dev.c:10491
ppp_unit_register drivers/net/ppp/ppp_generic.c:1219 [inline]
ppp_dev_configure+0x883/0xb10 drivers/net/ppp/ppp_generic.c:1275
ppp_create_interface drivers/net/ppp/ppp_generic.c:3348 [inline]
ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:1060 [inline]
ppp_ioctl+0x799/0x1cd0 drivers/net/ppp/ppp_generic.c:733
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_get_stats64+0xc3/0x290 drivers/net/ppp/ppp_generic.c:1539
dev_get_stats+0xad/0xa00 net/core/dev.c:10894
rtnl_fill_stats+0x47/0x880 net/core/rtnetlink.c:1268
rtnl_fill_ifinfo+0x18da/0x2270 net/core/rtnetlink.c:1909
rtmsg_ifinfo_build_skb+0x18a/0x260 net/core/rtnetlink.c:4079
rtmsg_ifinfo_event net/core/rtnetlink.c:4113 [inline]
rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4122
register_netdevice+0x1774/0x1b00 net/core/dev.c:10491
ppp_unit_register drivers/net/ppp/ppp_generic.c:1219 [inline]
ppp_dev_configure+0x883/0xb10 drivers/net/ppp/ppp_generic.c:1275
ppp_create_interface drivers/net/ppp/ppp_generic.c:3348 [inline]
ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:1060 [inline]
ppp_ioctl+0x799/0x1cd0 drivers/net/ppp/ppp_generic.c:733
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
}
... key at: [<ffffffff9a68b2c0>] ppp_dev_configure.__key.67+0x0/0x20
... acquired at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_connect_channel+0x174/0x650 drivers/net/ppp/ppp_generic.c:3484
ppp_ioctl+0xdd6/0x1cd0 drivers/net/ppp/ppp_generic.c:761
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
the dependencies between the lock to be acquired
and SOFTIRQ-READ-irq-unsafe lock:
-> (&pch->downl){+.+.}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_unregister_channel+0x7c/0x300 drivers/net/ppp/ppp_generic.c:2992
ppp_sync_close+0xf4/0x160 drivers/net/ppp/ppp_synctty.c:236
tty_set_ldisc+0x35d/0x560 drivers/tty/tty_ldisc.c:557
tty_ioctl+0xbdc/0xdc0 drivers/tty/tty_io.c:2739
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
SOFTIRQ-ON-W at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]
ppp_input+0x18b/0xa10 drivers/net/ppp/ppp_generic.c:2304
pppoe_rcv_core+0x117/0x310 drivers/net/ppp/pppoe.c:379
sk_backlog_rcv include/net/sock.h:1111 [inline]
__release_sock+0x243/0x350 net/core/sock.c:3004
release_sock+0x61/0x1f0 net/core/sock.c:3558
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
___sys_sendmsg net/socket.c:2651 [inline]
__sys_sendmmsg+0x3b2/0x740 net/socket.c:2737
__do_sys_sendmmsg net/socket.c:2766 [inline]
__se_sys_sendmmsg net/socket.c:2763 [inline]
__x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2763
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_unregister_channel+0x7c/0x300 drivers/net/ppp/ppp_generic.c:2992
ppp_sync_close+0xf4/0x160 drivers/net/ppp/ppp_synctty.c:236
tty_set_ldisc+0x35d/0x560 drivers/tty/tty_ldisc.c:557
tty_ioctl+0xbdc/0xdc0 drivers/tty/tty_io.c:2739
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
}
... key at: [<ffffffff9a68b180>] ppp_register_net_channel.__key.1+0x0/0x20
... acquired at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_connect_channel+0x194/0x650 drivers/net/ppp/ppp_generic.c:3485
ppp_ioctl+0xdd6/0x1cd0 drivers/net/ppp/ppp_generic.c:761
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> (&ppp->rlock){+...}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_get_stats64+0x33/0x290 drivers/net/ppp/ppp_generic.c:1534
dev_get_stats+0xad/0xa00 net/core/dev.c:10894
rtnl_fill_stats+0x47/0x880 net/core/rtnetlink.c:1268
rtnl_fill_ifinfo+0x18da/0x2270 net/core/rtnetlink.c:1909
rtmsg_ifinfo_build_skb+0x18a/0x260 net/core/rtnetlink.c:4079
rtmsg_ifinfo_event net/core/rtnetlink.c:4113 [inline]
rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4122
register_netdevice+0x1774/0x1b00 net/core/dev.c:10491
ppp_unit_register drivers/net/ppp/ppp_generic.c:1219 [inline]
ppp_dev_configure+0x883/0xb10 drivers/net/ppp/ppp_generic.c:1275
ppp_create_interface drivers/net/ppp/ppp_generic.c:3348 [inline]
ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:1060 [inline]
ppp_ioctl+0x799/0x1cd0 drivers/net/ppp/ppp_generic.c:733
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_get_stats64+0x33/0x290 drivers/net/ppp/ppp_generic.c:1534
dev_get_stats+0xad/0xa00 net/core/dev.c:10894
rtnl_fill_stats+0x47/0x880 net/core/rtnetlink.c:1268
rtnl_fill_ifinfo+0x18da/0x2270 net/core/rtnetlink.c:1909
rtmsg_ifinfo_build_skb+0x18a/0x260 net/core/rtnetlink.c:4079
rtmsg_ifinfo_event net/core/rtnetlink.c:4113 [inline]
rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4122
register_netdevice+0x1774/0x1b00 net/core/dev.c:10491
ppp_unit_register drivers/net/ppp/ppp_generic.c:1219 [inline]
ppp_dev_configure+0x883/0xb10 drivers/net/ppp/ppp_generic.c:1275
ppp_create_interface drivers/net/ppp/ppp_generic.c:3348 [inline]
ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:1060 [inline]
ppp_ioctl+0x799/0x1cd0 drivers/net/ppp/ppp_generic.c:733
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
}
... key at: [<ffffffff9a68b2a0>] ppp_dev_configure.__key+0x0/0x20
... acquired at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_disconnect_channel+0x9a/0x2d0 drivers/net/ppp/ppp_generic.c:3528
ppp_unregister_channel+0xb9/0x300 drivers/net/ppp/ppp_generic.c:2996
ppp_asynctty_close+0xf8/0x190 drivers/net/ppp/ppp_async.c:238
tty_ldisc_kill+0xa3/0x1a0 drivers/tty/tty_ldisc.c:613
tty_ldisc_release+0x1a1/0x200 drivers/tty/tty_ldisc.c:781
tty_release_struct+0x2b/0xe0 drivers/tty/tty_io.c:1696
tty_release+0xd0c/0x12c0 drivers/tty/tty_io.c:1867
__fput+0x24a/0x8a0 fs/file_table.c:422
task_work_run+0x24f/0x310 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
stack backtrace:
CPU: 1 UID: 0 PID: 19895 Comm: syz.3.10439 Not tainted 6.11.0-rc7-syzkaller-00097-g196145c606d0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
print_bad_irq_dependency kernel/locking/lockdep.c:2625 [inline]
check_irq_usage kernel/locking/lockdep.c:2864 [inline]
check_prev_add kernel/locking/lockdep.c:3137 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x4de0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
ppp_disconnect_channel+0x9a/0x2d0 drivers/net/ppp/ppp_generic.c:3528
ppp_unregister_channel+0xb9/0x300 drivers/net/ppp/ppp_generic.c:2996
ppp_asynctty_close+0xf8/0x190 drivers/net/ppp/ppp_async.c:238
tty_ldisc_kill+0xa3/0x1a0 drivers/tty/tty_ldisc.c:613
tty_ldisc_release+0x1a1/0x200 drivers/tty/tty_ldisc.c:781
tty_release_struct+0x2b/0xe0 drivers/tty/tty_io.c:1696
tty_release+0xd0c/0x12c0 drivers/tty/tty_io.c:1867
__fput+0x24a/0x8a0 fs/file_table.c:422
task_work_run+0x24f/0x310 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb503d7def9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb50405fb88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000017ae17 RCX: 00007fb503d7def9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb503f37a80 R08: 0000000000000001 R09: 00007fb50405fe7f
R10: 00007fb503c00000 R11: 0000000000000246 R12: 000000000017ae94
R13: 00007fb50405fc90 R14: 0000000000000032 R15: ffffffffffffffff
</TASK>