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BUG: soft lockup in wg_packet_handshake_receive_worker

Status: moderation: reported on 2024/07/02 23:13
Subsystems: wireguard
[Documentation on labels]
Reported-by: syzbot+deb5d09dfa2baf1ff41d@syzkaller.appspotmail.com
First crash: 8d06h, last: 8d06h
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 BUG: soft lockup in wg_packet_handshake_receive_worker origin:upstream C 6 32d 404d 0/3 upstream: reported C repro on 2023/05/29 21:30
upstream INFO: rcu detected stall in wg_packet_handshake_receive_worker (2) wireguard 1 256d 256d 0/27 auto-obsoleted due to no activity on 2024/01/22 15:31
upstream INFO: rcu detected stall in wg_packet_handshake_receive_worker wireguard C error inconclusive 3 359d 1255d 0/27 auto-obsoleted due to no activity on 2023/10/21 23:48

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 27s! [kworker/0:1:9]
Modules linked in:
irq event stamp: 291789
hardirqs last  enabled at (291788): [<ffff800080239cc0>] queue_work_on+0x100/0x1a0 kernel/workqueue.c:2414
hardirqs last disabled at (291789): [<ffff80008b068448>] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline]
hardirqs last disabled at (291789): [<ffff80008b068448>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551
softirqs last  enabled at (291780): [<ffff800085338f5c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (291784): [<ffff800085338ea4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.10.0-rc5-syzkaller-gb4a3f9b4863a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : queue_work_on+0x144/0x1a0 kernel/workqueue.c:2415
lr : queue_work_on+0x140/0x1a0 kernel/workqueue.c:2414
sp : ffff800093fe7610
x29: ffff800093fe7610 x28: dfff800000000000 x27: ffff0000c6a11c20
x26: 0000000000800001 x25: 0000000000000000 x24: 0000000000000000
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000d46f4000
x20: 0000000000000001 x19: 00000000000000c0 x18: ffff800093fe6f60
x17: 0000000000032841 x16: ffff800080338814 x15: 0000000000000001
x14: 1fffe000367accf0 x13: 0000000000000000 x12: 0000000000000003
x11: 0000000000000200 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c19c8000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000008 x3 : 0000000000000000
x2 : 0000000000000002 x1 : 0000000000000080 x0 : 0000000000000000
Call trace:
 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline]
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline]
 queue_work_on+0x144/0x1a0 kernel/workqueue.c:2414
 wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:176 [inline]
 wg_packet_create_data drivers/net/wireguard/send.c:320 [inline]
 wg_packet_send_staged_packets+0xe38/0x1460 drivers/net/wireguard/send.c:388
 wg_packet_send_keepalive+0x140/0x244 drivers/net/wireguard/send.c:239
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:186 [inline]
 wg_packet_handshake_receive_worker+0x594/0xc60 drivers/net/wireguard/receive.c:213
 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x938/0xef4 kernel/workqueue.c:3393
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.10.0-rc5-syzkaller-gb4a3f9b4863a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : handle_softirqs+0x1c4/0xbfc kernel/softirq.c:542
lr : handle_softirqs+0x1c0/0xbfc kernel/softirq.c:538
sp : ffff800080017f00
x29: ffff800080017f80 x28: 0000000000000186 x27: 1fffe0001836e001
x26: ffff80008f19d000 x25: ffff0000c1b70010 x24: ffff0000c1b70008
x23: ffff0000c1b7002c x22: dfff800000000000 x21: ffff80008f0e6cfc
x20: 00000000ffffd494 x19: ffff0001b3d89f00 x18: 1fffe000367ae9de
x17: ffff800124c8e000 x16: ffff800080338814 x15: 0000000000000001
x14: ffff80008f1a0558 x13: dfff800000000000 x12: 0000000000000003
x11: 0000000000000101 x10: 0000000000000003 x9 : 0000000000000000
x8 : 00000000000705ea x7 : ffff80008044d544 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0000c1b70000 x1 : ffff80008b1e04a0 x0 : ffff800124c8e000
Call trace:
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline]
 handle_softirqs+0x1c4/0xbfc kernel/softirq.c:538
 __do_softirq+0x14/0x20 kernel/softirq.c:588
 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81
 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889
 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0x1d8/0x434 kernel/softirq.c:637
 irq_exit_rcu+0x14/0x84 kernel/softirq.c:649
 __el1_irq arch/arm64/kernel/entry-common.c:537 [inline]
 el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:551
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:556
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:594
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
 arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:48
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1f0/0x4e4 kernel/sched/idle.c:332
 cpu_startup_entry+0x5c/0x74 kernel/sched/idle.c:430
 secondary_start_kernel+0x1bc/0x1e4 arch/arm64/kernel/smp.c:276
 __secondary_switched+0xb8/0xbc arch/arm64/kernel/head.S:417

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/28 23:05 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b4a3f9b4863a 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: soft lockup in wg_packet_handshake_receive_worker
* Struck through repros no longer work on HEAD.