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Date: Wed, 16 Sep 2020 01:51:15 -0700
From: syzbot <syzbot+0c9fc3836c6c057a975a@...kaller.appspotmail.com>
To: davem@...emloft.net, herbert@...dor.apana.org.au, kuba@...nel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
steffen.klassert@...unet.com, syzkaller-bugs@...glegroups.com
Subject: possible deadlock in xfrm_policy_lookup_inexact_addr
Hello,
syzbot found the following issue on:
HEAD commit: 5fa35f24 Add linux-next specific files for 20200916
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14268701900000
kernel config: https://syzkaller.appspot.com/x/.config?x=6bdb7e39caf48f53
dashboard link: https://syzkaller.appspot.com/bug?extid=0c9fc3836c6c057a975a
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0c9fc3836c6c057a975a@...kaller.appspotmail.com
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.9.0-rc5-next-20200916-syzkaller #0 Not tainted
-----------------------------------------------------
kworker/1:4/8015 [HC0[0]:SC0[4]:HE0:SE0] is trying to acquire:
ffff8880962d8928 (&s->seqcount#12){+.+.}-{0:0}, at: xfrm_policy_lookup_inexact_addr+0x57/0x200 net/xfrm/xfrm_policy.c:1909
and this task is already holding:
ffff88808b9284d0 (&peer->endpoint_lock){++-.}-{2:2}, at: wg_socket_send_skb_to_peer+0x5e/0x220 drivers/net/wireguard/socket.c:172
which would create a new lock dependency:
(&peer->endpoint_lock){++-.}-{2:2} -> (&s->seqcount#12){+.+.}-{0:0}
but this new dependency connects a SOFTIRQ-irq-safe lock:
(&peer->endpoint_lock){++-.}-{2:2}
... which became SOFTIRQ-irq-safe at:
lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398
__raw_write_lock_bh include/linux/rwlock_api_smp.h:203 [inline]
_raw_write_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:319
wg_socket_clear_peer_endpoint_src+0x1b/0xa0 drivers/net/wireguard/socket.c:309
wg_expired_retransmit_handshake+0xbd/0x3a0 drivers/net/wireguard/timers.c:73
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1413
expire_timers kernel/time/timer.c:1458 [inline]
__run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1755
__run_timers kernel/time/timer.c:1736 [inline]
run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
__do_softirq+0x202/0xa42 kernel/softirq.c:298
asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:786
__run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:393 [inline]
__irq_exit_rcu kernel/softirq.c:423 [inline]
irq_exit_rcu+0x235/0x280 kernel/softirq.c:435
sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
arch_safe_halt arch/x86/include/asm/paravirt.h:150 [inline]
acpi_safe_halt+0x95/0x180 drivers/acpi/processor_idle.c:111
acpi_idle_do_entry+0x15c/0x1b0 drivers/acpi/processor_idle.c:524
acpi_idle_enter+0x403/0xac0 drivers/acpi/processor_idle.c:650
cpuidle_enter_state+0x150/0xa70 drivers/cpuidle/cpuidle.c:243
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:355
call_cpuidle kernel/sched/idle.c:132 [inline]
cpuidle_idle_call kernel/sched/idle.c:213 [inline]
do_idle+0x48e/0x730 kernel/sched/idle.c:273
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:369
secondary_startup_64_no_verify+0xa6/0xab
to a SOFTIRQ-irq-unsafe lock:
(&s->seqcount#12){+.+.}-{0:0}
... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398
write_seqcount_t_begin_nested include/linux/seqlock.h:509 [inline]
write_seqcount_t_begin include/linux/seqlock.h:535 [inline]
write_seqlock include/linux/seqlock.h:883 [inline]
xfrm_set_spdinfo+0x302/0x660 net/xfrm/xfrm_user.c:1185
xfrm_user_rcv_msg+0x414/0x700 net/xfrm/xfrm_user.c:2684
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2692
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
____sys_sendmsg+0x6e8/0x810 net/socket.c:2362
___sys_sendmsg+0xf3/0x170 net/socket.c:2416
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2449
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&s->seqcount#12);
local_irq_disable();
lock(&peer->endpoint_lock);
lock(&s->seqcount#12);
<Interrupt>
lock(&peer->endpoint_lock);
*** DEADLOCK ***
5 locks held by kworker/1:4/8015:
#0: ffff88809423e538 ((wq_completion)wg-crypt-wg0#10){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff88809423e538 ((wq_completion)wg-crypt-wg0#10){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff88809423e538 ((wq_completion)wg-crypt-wg0#10){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff88809423e538 ((wq_completion)wg-crypt-wg0#10){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff88809423e538 ((wq_completion)wg-crypt-wg0#10){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff88809423e538 ((wq_completion)wg-crypt-wg0#10){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2240
#1: ffffc90015affda8 ((work_completion)(&queue->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2244
#2: ffff88808b9284d0 (&peer->endpoint_lock){++-.}-{2:2}, at: wg_socket_send_skb_to_peer+0x5e/0x220 drivers/net/wireguard/socket.c:172
#3: ffffffff89e71c60 (rcu_read_lock_bh){....}-{1:2}, at: send6+0x2ce/0xbc0 drivers/net/wireguard/socket.c:116
#4: ffffffff89e71cc0 (rcu_read_lock){....}-{1:2}, at: xfrm_policy_lookup_bytype+0x104/0xa40 net/xfrm/xfrm_policy.c:2082
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&peer->endpoint_lock){++-.}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398
__raw_write_lock_bh include/linux/rwlock_api_smp.h:203 [inline]
_raw_write_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:319
wg_socket_set_peer_endpoint drivers/net/wireguard/socket.c:282 [inline]
wg_socket_set_peer_endpoint+0x37c/0xbd0 drivers/net/wireguard/socket.c:272
set_peer+0x965/0x1030 drivers/net/wireguard/netlink.c:447
wg_set_device+0xcab/0x1520 drivers/net/wireguard/netlink.c:589
genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
__sys_sendto+0x21c/0x320 net/socket.c:1992
__do_sys_sendto net/socket.c:2004 [inline]
__se_sys_sendto net/socket.c:2000 [inline]
__x64_sys_sendto+0xdd/0x1b0 net/socket.c:2000
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
HARDIRQ-ON-R at:
lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398
__raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline]
_raw_read_lock_bh+0x3b/0x70 kernel/locking/spinlock.c:247
wg_socket_send_skb_to_peer drivers/net/wireguard/socket.c:172 [inline]
wg_socket_send_buffer_to_peer+0x168/0x340 drivers/net/wireguard/socket.c:199
wg_packet_send_handshake_initiation+0x1fc/0x240 drivers/net/wireguard/send.c:40
wg_packet_handshake_send_worker+0x18/0x30 drivers/net/wireguard/send.c:51
process_one_work+0x933/0x15a0 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3af/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
IN-SOFTIRQ-W at:
lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398
__raw_write_lock_bh include/linux/rwlock_api_smp.h:203 [inline]
_raw_write_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:319
wg_socket_clear_peer_endpoint_src+0x1b/0xa0 drivers/net/wireguard/socket.c:309
wg_expired_retransmit_handshake+0xbd/0x3a0 drivers/net/wireguard/timers.c:73
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1413
expire_timers kernel/time/timer.c:1458 [inline]
__run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1755
__run_timers kernel/time/timer.c:1736 [inline]
run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
__do_softirq+0x202/0xa42 kernel/softirq.c:298
asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:786
__run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:393 [inline]
__irq_exit_rcu kernel/softirq.c:423 [inline]
irq_exit_rcu+0x235/0x280 kernel/softirq.c:435
sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
arch_safe_halt arch/x86/include/asm/paravirt.h:150 [inline]
acpi_safe_halt+0x95/0x180 drivers/acpi/processor_idle.c:111
acpi_idle_do_entry+0x15c/0x1b0 drivers/acpi/processor_idle.c:524
acpi_idle_enter+0x403/0xac0 drivers/acpi/processor_idle.c:650
cpuidle_enter_state+0x150/0xa70 drivers/cpuidle/cpuidle.c:243
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:355
call_cpuidle kernel/sched/idle.c:132 [inline]
cpuidle_idle_call kernel/sched/idle.c:213 [inline]
do_idle+0x48e/0x730 kernel/sched/idle.c:273
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:369
secondary_startup_64_no_verify+0xa6/0xab
INITIAL USE at:
lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398
__raw_write_lock_bh include/linux/rwlock_api_smp.h:203 [inline]
_raw_write_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:319
wg_socket_set_peer_endpoint drivers/net/wireguard/socket.c:282 [inline]
wg_socket_set_peer_endpoint+0x37c/0xbd0 drivers/net/wireguard/socket.c:272
set_peer+0x965/0x1030 drivers/net/wireguard/netlink.c:447
wg_set_device+0xcab/0x1520 drivers/net/wireguard/netlink.c:589
genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:671
__sys_sendto+0x21c/0x320 net/socket.c:1992
__do_sys_sendto net/socket.c:2004 [inline]
__se_sys_sendto net/socket.c:2000 [inline]
__x64_sys_sendto+0xdd/0x1b0 net/socket.c:2000
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
(null) at:
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 8015 Comm: kworker/1:4 Not tainted 5.9.0-rc5-next-20200916-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
RIP: 0010:print_lock_trace kernel/locking/lockdep.c:1751 [inline]
RIP: 0010:print_lock_class_header kernel/locking/lockdep.c:2240 [inline]
RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af kernel/locking/lockdep.c:2263
Code: 48 8b 04 24 48 c1 e8 03 42 80 3c 20 00 74 09 48 8b 3c 24 e8 c1 2b d9 f9 48 8b 04 24 48 8b 00 48 8d 78 14 48 89 fa 48 c1 ea 03 <42> 0f b6 0c 22 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85
RSP: 0018:ffffc90015aff288 EFLAGS: 00010003
RAX: 0000000000000001 RBX: ffffc90015aff3e0 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff815c26b7 RDI: 0000000000000015
RBP: ffffc90015aff3e0 R08: 0000000000000004 R09: ffff8880ae720f8b
R10: 0000000000000000 R11: 6c6c756e28202020 R12: dffffc0000000000
R13: ffffffff8ca101a8 R14: 0000000000000009 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000746918 CR3: 0000000096f43000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
print_bad_irq_dependency kernel/locking/lockdep.c:2395 [inline]
check_irq_usage.cold+0x42d/0x5b0 kernel/locking/lockdep.c:2634
check_prev_add kernel/locking/lockdep.c:2823 [inline]
check_prevs_add kernel/locking/lockdep.c:2944 [inline]
validate_chain kernel/locking/lockdep.c:3562 [inline]
__lock_acquire+0x2800/0x55d0 kernel/locking/lockdep.c:4796
lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398
seqcount_lockdep_reader_access+0x139/0x1a0 include/linux/seqlock.h:103
xfrm_policy_lookup_inexact_addr+0x57/0x200 net/xfrm/xfrm_policy.c:1909
xfrm_policy_find_inexact_candidates+0xac/0x1d0 net/xfrm/xfrm_policy.c:1953
xfrm_policy_lookup_bytype+0x4b8/0xa40 net/xfrm/xfrm_policy.c:2108
xfrm_policy_lookup net/xfrm/xfrm_policy.c:2144 [inline]
xfrm_bundle_lookup net/xfrm/xfrm_policy.c:2944 [inline]
xfrm_lookup_with_ifid+0xaa1/0x2100 net/xfrm/xfrm_policy.c:3085
xfrm_lookup net/xfrm/xfrm_policy.c:3177 [inline]
xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:3188
ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1162
send6+0x62f/0xbc0 drivers/net/wireguard/socket.c:139
wg_socket_send_skb_to_peer+0xf5/0x220 drivers/net/wireguard/socket.c:177
wg_packet_create_data_done drivers/net/wireguard/send.c:252 [inline]
wg_packet_tx_worker+0x2f9/0x980 drivers/net/wireguard/send.c:280
process_one_work+0x933/0x15a0 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3af/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Modules linked in:
---[ end trace 8a68a086c40da004 ]---
RIP: 0010:print_lock_trace kernel/locking/lockdep.c:1751 [inline]
RIP: 0010:print_lock_class_header kernel/locking/lockdep.c:2240 [inline]
RIP: 0010:print_shortest_lock_dependencies.cold+0x110/0x2af kernel/locking/lockdep.c:2263
Code: 48 8b 04 24 48 c1 e8 03 42 80 3c 20 00 74 09 48 8b 3c 24 e8 c1 2b d9 f9 48 8b 04 24 48 8b 00 48 8d 78 14 48 89 fa 48 c1 ea 03 <42> 0f b6 0c 22 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85
RSP: 0018:ffffc90015aff288 EFLAGS: 00010003
RAX: 0000000000000001 RBX: ffffc90015aff3e0 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff815c26b7 RDI: 0000000000000015
RBP: ffffc90015aff3e0 R08: 0000000000000004 R09: ffff8880ae720f8b
R10: 0000000000000000 R11: 6c6c756e28202020 R12: dffffc0000000000
R13: ffffffff8ca101a8 R14: 0000000000000009 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000746918 CR3: 0000000096f43000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This report is generated by a bot. It may contain errors.
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