=====================================================
WARNING: SOFTIRQ-READ-safe -> SOFTIRQ-READ-unsafe lock order detected
6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 Not tainted
-----------------------------------------------------
syz.1.2302/20827 [HC0[0]:SC0[8]:HE1:SE0] is trying to acquire:
ffff88805bbac1e0 (&pch->downl){+.+.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff88805bbac1e0 (&pch->downl){+.+.}-{2:2}, at: ppp_connect_channel+0x194/0x650 drivers/net/ppp/ppp_generic.c:3485
and this task is already holding:
ffff88805eb04e10 (&ppp->rlock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff88805eb04e10 (&ppp->rlock){+...}-{2:2}, at: ppp_connect_channel+0x185/0x650 drivers/net/ppp/ppp_generic.c:3484
which would create a new lock dependency:
(&ppp->rlock){+...}-{2:2} -> (&pch->downl){+.+.}-{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:5825
__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
ppp_async_process+0x7f/0x150 drivers/net/ppp/ppp_async.c:495
tasklet_action_common+0x321/0x4d0 kernel/softirq.c:784
handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
run_ksoftirqd+0xca/0x130 kernel/softirq.c:927
smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
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:5825
__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:1113 [inline]
__release_sock+0x243/0x350 net/core/sock.c:3072
release_sock+0x61/0x1f0 net/core/sock.c:3626
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:744
____sys_sendmsg+0x52a/0x7e0 net/socket.c:2602
___sys_sendmsg net/socket.c:2656 [inline]
__sys_sendmmsg+0x4a8/0x730 net/socket.c:2735
__compat_sys_sendmmsg net/compat.c:360 [inline]
__do_compat_sys_sendmmsg net/compat.c:367 [inline]
__se_compat_sys_sendmmsg net/compat.c:364 [inline]
__ia32_compat_sys_sendmmsg+0xa2/0xc0 net/compat.c:364
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Chain exists of:
&pch->upl --> &ppp->rlock --> &pch->downl
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&pch->downl);
local_irq_disable();
lock(&pch->upl);
lock(&ppp->rlock);
<Interrupt>
lock(&pch->upl);
*** DEADLOCK ***
5 locks held by syz.1.2302/20827:
#0: ffffffff8f4b91e8 (ppp_mutex){+.+.}-{3:3}, at: ppp_ioctl+0x112/0x1cd0 drivers/net/ppp/ppp_generic.c:729
#1: ffff888065d304c0 (&pn->all_ppp_mutex){+.+.}-{3:3}, at: ppp_connect_channel+0x5e/0x650 drivers/net/ppp/ppp_generic.c:3474
#2: ffff88805bbac248 (&pch->upl){++.-}-{2:2}, at: ppp_connect_channel+0x87/0x650 drivers/net/ppp/ppp_generic.c:3478
#3: ffff88805eb04e50 (&ppp->wlock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#3: ffff88805eb04e50 (&ppp->wlock){+...}-{2:2}, at: ppp_connect_channel+0x174/0x650 drivers/net/ppp/ppp_generic.c:3484
#4: ffff88805eb04e10 (&ppp->rlock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#4: ffff88805eb04e10 (&ppp->rlock){+...}-{2:2}, at: ppp_connect_channel+0x185/0x650 drivers/net/ppp/ppp_generic.c:3484
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:5825
__raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline]
_raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334
ppp_bridge_channels+0x32/0x4c0 drivers/net/ppp/ppp_generic.c:643
ppp_ioctl+0xe8f/0x1cd0 drivers/net/ppp/ppp_generic.c:783
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
HARDIRQ-ON-R at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline]
_raw_read_lock_bh+0x3d/0x50 kernel/locking/spinlock.c:252
ppp_channel_push+0x2c/0x220 drivers/net/ppp/ppp_generic.c:2186
ppp_write+0x2b0/0x3e0 drivers/net/ppp/ppp_generic.c:540
vfs_write+0x29c/0xc90 fs/read_write.c:681
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
IN-SOFTIRQ-R at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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
ppp_async_process+0x7f/0x150 drivers/net/ppp/ppp_async.c:495
tasklet_action_common+0x321/0x4d0 kernel/softirq.c:784
handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
run_ksoftirqd+0xca/0x130 kernel/softirq.c:927
smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INITIAL USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline]
_raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334
ppp_bridge_channels+0x32/0x4c0 drivers/net/ppp/ppp_generic.c:643
ppp_ioctl+0xe8f/0x1cd0 drivers/net/ppp/ppp_generic.c:783
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
INITIAL READ USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline]
_raw_read_lock_bh+0x3d/0x50 kernel/locking/spinlock.c:252
ppp_channel_push+0x2c/0x220 drivers/net/ppp/ppp_generic.c:2186
ppp_write+0x2b0/0x3e0 drivers/net/ppp/ppp_generic.c:540
vfs_write+0x29c/0xc90 fs/read_write.c:681
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
}
... key at: [<ffffffff9a733fa0>] ppp_register_net_channel.__key.3+0x0/0x20
-> (&ppp->wlock){+...}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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:10937
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:4112 [inline]
rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4121
register_netdevice+0x1774/0x1b00 net/core/dev.c:10534
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+0x797/0x1cd0 drivers/net/ppp/ppp_generic.c:733
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
INITIAL USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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:10937
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:4112 [inline]
rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4121
register_netdevice+0x1774/0x1b00 net/core/dev.c:10534
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+0x797/0x1cd0 drivers/net/ppp/ppp_generic.c:733
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
}
... key at: [<ffffffff9a7340c0>] ppp_dev_configure.__key.67+0x0/0x20
... acquired at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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+0xdd4/0x1cd0 drivers/net/ppp/ppp_generic.c:761
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> (&ppp->rlock){+...}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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:10937
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:4112 [inline]
rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4121
register_netdevice+0x1774/0x1b00 net/core/dev.c:10534
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+0x797/0x1cd0 drivers/net/ppp/ppp_generic.c:733
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
INITIAL USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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:10937
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:4112 [inline]
rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4121
register_netdevice+0x1774/0x1b00 net/core/dev.c:10534
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+0x797/0x1cd0 drivers/net/ppp/ppp_generic.c:733
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
}
... key at: [<ffffffff9a7340a0>] ppp_dev_configure.__key+0x0/0x20
... acquired at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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_dev_uninit+0x6c/0x1a0 drivers/net/ppp/ppp_generic.c:1572
unregister_netdevice_many_notify+0x1735/0x1da0 net/core/dev.c:11421
unregister_netdevice_many net/core/dev.c:11461 [inline]
unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11335
unregister_netdevice include/linux/netdevice.h:3118 [inline]
ppp_release+0xed/0x1f0 drivers/net/ppp/ppp_generic.c:410
__fput+0x23f/0x880 fs/file_table.c:431
task_work_run+0x24f/0x310 kernel/task_work.c:228
get_signal+0x15e8/0x1740 kernel/signal.c:2690
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [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+0xc9/0x370 kernel/entry/common.c:218
__do_fast_syscall_32+0xc4/0x110 arch/x86/entry/common.c:389
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
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:5825
__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:1113 [inline]
__release_sock+0x243/0x350 net/core/sock.c:3072
release_sock+0x61/0x1f0 net/core/sock.c:3626
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:744
____sys_sendmsg+0x52a/0x7e0 net/socket.c:2602
___sys_sendmsg net/socket.c:2656 [inline]
__sys_sendmmsg+0x4a8/0x730 net/socket.c:2735
__compat_sys_sendmmsg net/compat.c:360 [inline]
__do_compat_sys_sendmmsg net/compat.c:367 [inline]
__se_compat_sys_sendmmsg net/compat.c:364 [inline]
__ia32_compat_sys_sendmmsg+0xa2/0xc0 net/compat.c:364
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
SOFTIRQ-ON-W at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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:1113 [inline]
__release_sock+0x243/0x350 net/core/sock.c:3072
release_sock+0x61/0x1f0 net/core/sock.c:3626
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:744
____sys_sendmsg+0x52a/0x7e0 net/socket.c:2602
___sys_sendmsg net/socket.c:2656 [inline]
__sys_sendmmsg+0x4a8/0x730 net/socket.c:2735
__compat_sys_sendmmsg net/compat.c:360 [inline]
__do_compat_sys_sendmmsg net/compat.c:367 [inline]
__se_compat_sys_sendmmsg net/compat.c:364 [inline]
__ia32_compat_sys_sendmmsg+0xa2/0xc0 net/compat.c:364
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
INITIAL USE at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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:1113 [inline]
__release_sock+0x243/0x350 net/core/sock.c:3072
release_sock+0x61/0x1f0 net/core/sock.c:3626
pppoe_sendmsg+0xd5/0x750 drivers/net/ppp/pppoe.c:903
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:744
____sys_sendmsg+0x52a/0x7e0 net/socket.c:2602
___sys_sendmsg net/socket.c:2656 [inline]
__sys_sendmmsg+0x4a8/0x730 net/socket.c:2735
__compat_sys_sendmmsg net/compat.c:360 [inline]
__do_compat_sys_sendmmsg net/compat.c:367 [inline]
__se_compat_sys_sendmmsg net/compat.c:364 [inline]
__ia32_compat_sys_sendmmsg+0xa2/0xc0 net/compat.c:364
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
}
... key at: [<ffffffff9a733f80>] ppp_register_net_channel.__key.1+0x0/0x20
... acquired at:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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+0xdd4/0x1cd0 drivers/net/ppp/ppp_generic.c:761
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
stack backtrace:
CPU: 0 UID: 0 PID: 20827 Comm: syz.1.2302 Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_bad_irq_dependency kernel/locking/lockdep.c:2647 [inline]
check_irq_usage kernel/locking/lockdep.c:2888 [inline]
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x4ebd/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__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+0xdd4/0x1cd0 drivers/net/ppp/ppp_generic.c:761
ppp_compat_ioctl+0x161/0x770 drivers/net/ppp/ppp_generic.c:1040
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x510/0xc90 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf742d579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f571656c EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000004004743a
RDX: 0000000020000300 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 90 nop
31: 90 nop
32: 90 nop
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop