INFO: task syz.3.4615:2267 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.4615 state:D stack:28656 pid:2267 tgid:2243 ppid:20107 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5340 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
blk_trace_startstop+0x8f/0x610 kernel/trace/blktrace.c:901
blk_trace_ioctl+0x315/0x740 kernel/trace/blktrace.c:947
blkdev_common_ioctl+0x13a7/0x3250 block/ioctl.c:712
blkdev_ioctl+0x528/0x740 block/ioctl.c:786
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fccbd19bf79
RSP: 002b:00007fccbe00f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fccbd416270 RCX: 00007fccbd19bf79
RDX: 0000000000000000 RSI: 0000000000001274 RDI: 0000000000000005
RBP: 00007fccbd2327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fccbd416308 R14: 00007fccbd416270 R15: 00007fccbd53fa48
INFO: task syz.3.4615:2269 blocked for more than 146 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.4615 state:D stack:28728 pid:2269 tgid:2243 ppid:20107 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5340 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
blk_trace_remove kernel/trace/blktrace.c:562 [inline]
blk_trace_ioctl+0x39b/0x740 kernel/trace/blktrace.c:950
blkdev_common_ioctl+0x13a7/0x3250 block/ioctl.c:712
blkdev_ioctl+0x528/0x740 block/ioctl.c:786
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fccbd19bf79
RSP: 002b:00007fccbdfee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fccbd416360 RCX: 00007fccbd19bf79
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000005
RBP: 00007fccbd2327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fccbd4163f8 R14: 00007fccbd416360 R15: 00007fccbd53fa48
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e7603e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e7603e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e7603e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
1 lock held by kswapd1/81:
2 locks held by udevd/5193:
2 locks held by getty/5583:
#0: ffff888035e3b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/1699:
2 locks held by syz.3.4615/2258:
1 lock held by syz.3.4615/2267:
#0: ffff888025ba1bf0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_startstop+0x8f/0x610 kernel/trace/blktrace.c:901
1 lock held by syz.3.4615/2269:
#0: ffff888025ba1bf0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:562 [inline]
#0: ffff888025ba1bf0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x39b/0x740 kernel/trace/blktrace.c:950
1 lock held by syz.9.4773/3711:
#0: ffff888025ba1bf0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove kernel/trace/blktrace.c:562 [inline]
#0: ffff888025ba1bf0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x39b/0x740 kernel/trace/blktrace.c:950
1 lock held by syz.0.5075/6503:
#0: ffffffff8e766540 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:3828
1 lock held by syz.6.5099/6725:
#0: ffffffff8fbc9cc8 (rtnl_mutex){+.+.}-{4:4}, at: ip_mroute_setsockopt+0x12e/0xff0 net/ipv4/ipmr.c:1387
5 locks held by syz.6.5099/6731:
#0: ffffffff8fc378f0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8fc37708 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline]
#1: ffffffff8fc37708 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
#1: ffffffff8fc37708 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x10b/0x7a0 net/netlink/genetlink.c:1209
#2: ffffffff8fbc9cc8 (rtnl_mutex){+.+.}-{4:4}, at: wg_set_device_doit+0x170/0x2070 drivers/net/wireguard/netlink.c:484
#3: ffff888061175528 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_set_device_doit+0x18b/0x2070 drivers/net/wireguard/netlink.c:485
#4: ffffffff8e766678 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#4: ffffffff8e766678 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
1 lock held by syz.6.5099/6733:
#0: ffffffff8fbc9cc8 (rtnl_mutex){+.+.}-{4:4}, at: ip_mroute_setsockopt+0x12e/0xff0 net/ipv4/ipmr.c:1387
1 lock held by syz.6.5099/6735:
#0: ffffffff8fbc9cc8 (rtnl_mutex){+.+.}-{4:4}, at: ip_mroute_setsockopt+0x12e/0xff0 net/ipv4/ipmr.c:1387
1 lock held by syz.6.5099/6736:
#0: ffffffff8fbc9cc8 (rtnl_mutex){+.+.}-{4:4}, at: ip_mroute_setsockopt+0x12e/0xff0 net/ipv4/ipmr.c:1387
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4139 Comm: kworker/0:6 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
RIP: 0010:select_idle_sibling kernel/sched/fair.c:7816 [inline]
RIP: 0010:select_task_rq_fair+0x9b0/0x4320 kernel/sched/fair.c:8572
Code: c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 6e 13 00 00 41 83 3e 01 0f 85 ee 19 00 00 65 8b 05 90 f5 82 11 00 01 ff 00 0f 85 dc 19 00 00 e8 f0 d1 13 0a 39 c3 0f 85 cf 19
RSP: 0018:ffffc90000007bd8 EFLAGS: 00000046
RAX: 0000000080010605 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880b863ad98
RBP: 0000000000000004 R08: ffff88801c6a1d5f R09: 1ffff110038d43ab
R10: dffffc0000000000 R11: ffffed10038d43ac R12: 0000000000000000
R13: 1ffffffff1c348f2 R14: ffff888030caa298 R15: ffff888030ca9e6c
FS: 0000000000000000(0000) GS:ffff88812546f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f233fb485a3 CR3: 0000000031aae000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000ffff000c DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
select_task_rq kernel/sched/core.c:3521 [inline]
try_to_wake_up+0x4db/0x1390 kernel/sched/core.c:4230
hrtimer_wakeup+0x4e/0x60 kernel/time/hrtimer.c:2021
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline]
RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478
Code: 0f 84 44 ff ff ff e8 02 2d 21 00 fb eb 44 e8 fa 2c 21 00 e8 85 77 07 0a 4d 85 f6 74 94 e8 eb 2c 21 00 fb 48 c7 c7 00 28 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 16
RSP: 0018:ffffc900038171c0 EFLAGS: 00000293
RAX: ffffffff81a45b15 RBX: ffffffff81a4598f RCX: ffff888030ca9e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e752800
RBP: ffffc90003817270 R08: ffffffff90114db7 R09: 1ffffffff20229b6
R10: dffffc0000000000 R11: fffffbfff20229b7 R12: 0000000000000000
R13: 0000000000000042 R14: 0000000000000200 R15: 1ffff92000702e3c
_printk+0xdd/0x130 kernel/printk/printk.c:2504
gred_dequeue+0x4e6/0x6f0 net/sched/sch_gred.c:273
dequeue_skb net/sched/sch_generic.c:297 [inline]
qdisc_restart net/sched/sch_generic.c:402 [inline]
__qdisc_run+0x26c/0x15d0 net/sched/sch_generic.c:420
qdisc_run include/net/pkt_sched.h:120 [inline]
__dev_xmit_skb net/core/dev.c:4262 [inline]
__dev_queue_xmit+0x1bbe/0x38a0 net/core/dev.c:4795
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246
ip6tunnel_xmit include/net/ip6_tunnel.h:162 [inline]
udp_tunnel6_xmit_skb+0x68f/0xb00 net/ipv6/ip6_udp_tunnel.c:112
send6+0x5f3/0x940 drivers/net/wireguard/socket.c:152
wg_socket_send_skb_to_peer+0x111/0x1d0 drivers/net/wireguard/socket.c:178
wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
wg_packet_tx_worker+0x1c8/0x7c0 drivers/net/wireguard/send.c:276
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245