INFO: task syz.3.1981:12539 blocked for more than 143 seconds.
Not tainted 6.14.0-syzkaller-05885-g4f1eaabb4b66 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1981 state:D stack:24712 pid:12539 tgid:12537 ppid:5837 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5366 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
__schedule_loop kernel/sched/core.c:6824 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6839
schedule_timeout+0xb1/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x360/0x630 kernel/sched/completion.c:148
kthread_stop+0x1a1/0x640 kernel/kthread.c:791
rxrpc_release_sock net/rxrpc/af_rxrpc.c:953 [inline]
rxrpc_release+0x281/0x420 net/rxrpc/af_rxrpc.c:980
__sock_release net/socket.c:647 [inline]
sock_close+0xbc/0x240 net/socket.c:1391
__fput+0x3e9/0x9f0 fs/file_table.c:465
task_work_run+0x251/0x310 kernel/task_work.c:227
get_signal+0x15db/0x1730 kernel/signal.c:2808
arch_do_signal_or_restart+0x98/0x840 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:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5633d8d169
RSP: 002b:00007f5634c2f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: fffffffffffffe00 RBX: 00007f5633fa5fa0 RCX: 00007f5633d8d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f5633e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: e8ce25b3ffff0000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5633fa5fa0 R15: 00007fffdfed09b8
Showing all locks held in the system:
3 locks held by kworker/u8:1/13:
1 lock held by khungtaskd/31:
#0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6761
3 locks held by kworker/u8:7/2956:
#0: ffff88801bef6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801bef6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc9000c357c60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000c357c60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
#2: ffffffff900d8bd0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x17c/0xd60 net/core/net_namespace.c:608
2 locks held by getty/5587:
#0: ffff88803514a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000334b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x53d/0x16b0 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:16/6431:
1 lock held by syz.3.1981/12539:
#0: ffff888052c5a008 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888052c5a008 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:646 [inline]
#0: ffff888052c5a008 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x90/0x240 net/socket.c:1391
1 lock held by krxrpcio/20000/12541:
1 lock held by syz.5.3047/16280:
#0: ffffffff8ed3f778 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline]
#0: ffffffff8ed3f778 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x384/0x830 kernel/rcu/tree_exp.h:998
1 lock held by syz.2.3049/16297:
#0: ffffffff8ed3f778 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#0: ffffffff8ed3f778 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-05885-g4f1eaabb4b66 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12541 Comm: krxrpcio/20000 Not tainted 6.14.0-syzkaller-05885-g4f1eaabb4b66 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:check_preemption_disabled+0x43/0x120 lib/smp_processor_id.c:55
Code: 48 89 44 24 08 65 8b 1d 2f 32 3f 07 65 8b 05 24 32 3f 07 a9 ff ff ff 7f 74 24 65 49 8b 04 24 48 3b 44 24 08 0f 85 cc 00 00 00 <89> d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 c7
RSP: 0018:ffffc90000a07cf8 EFLAGS: 00000046
RAX: f9350bb49b6dd100 RBX: 0000000000000001 RCX: ffffffff81cb4d8c
RDX: 0000000000000000 RSI: ffffffff8e4dd516 RDI: ffffffff8ca0f000
RBP: ffffc90000a07e30 R08: ffffffff905e4477 R09: 1ffffffff20bc88e
R10: dffffc0000000000 R11: fffffbfff20bc88f R12: ffffffff93636020
R13: ffffffff93636020 R14: ffff888078a68000 R15: ffff888078a68af0
FS: 0000000000000000(0000) GS:ffff8881250ea000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c330ccb CR3: 000000000eb38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lockdep_recursion_finish kernel/locking/lockdep.c:472 [inline]
lockdep_hardirqs_on_prepare+0x1b9/0x2b0 kernel/locking/lockdep.c:4412
trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78
seqcount_lockdep_reader_access+0x14f/0x230 include/linux/seqlock.h:74
xfrm_policy_lookup_bytype+0x308/0x1960 net/xfrm/xfrm_policy.c:2174
xfrm_policy_lookup net/xfrm/xfrm_policy.c:2228 [inline]
__xfrm_policy_check+0x16ef/0x3330 net/xfrm/xfrm_policy.c:3745
__xfrm_policy_check2 include/net/xfrm.h:1297 [inline]
xfrm_policy_check include/net/xfrm.h:1302 [inline]
xfrm4_policy_check+0x4fe/0x700 include/net/xfrm.h:1307
udp_queue_rcv_one_skb+0x5f/0x1820 net/ipv4/udp.c:2349
udp_unicast_rcv_skb+0x255/0x3d0 net/ipv4/udp.c:2617
__udp4_lib_rcv+0x136d/0x2720 net/ipv4/udp.c:2693
ip_protocol_deliver_rcu+0x290/0x450 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x343/0x600 net/ipv4/ip_input.c:233
NF_HOOK+0x3a0/0x450 include/linux/netfilter.h:314
NF_HOOK+0x3a0/0x450 include/linux/netfilter.h:314
__netif_receive_skb_one_core net/core/dev.c:5891 [inline]
__netif_receive_skb+0x2c9/0x670 net/core/dev.c:6004
process_backlog+0x664/0x15c0 net/core/dev.c:6356
__napi_poll+0xcb/0x480 net/core/dev.c:7328
napi_poll net/core/dev.c:7392 [inline]
net_rx_action+0x89d/0x1240 net/core/dev.c:7514
handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
do_softirq+0x11f/0x1e0 kernel/softirq.c:462
__local_bh_enable_ip+0x1be/0x200 kernel/softirq.c:389
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline]
__dev_queue_xmit+0x1780/0x3f60 net/core/dev.c:4660
dev_queue_xmit include/linux/netdevice.h:3350 [inline]
neigh_hh_output include/net/neighbour.h:523 [inline]
neigh_output include/net/neighbour.h:537 [inline]
ip_finish_output2+0xcd2/0x12e0 net/ipv4/ip_output.c:235
ip_local_out net/ipv4/ip_output.c:129 [inline]
ip_send_skb+0x74/0x100 net/ipv4/ip_output.c:1501
udp_send_skb+0xad0/0x1650 net/ipv4/udp.c:1195
udp_sendmsg+0x1cb3/0x2ca0 net/ipv4/udp.c:1483
do_udp_sendmsg net/rxrpc/output.c:35 [inline]
rxrpc_reject_packet+0x62f/0xa10 net/rxrpc/output.c:859
rxrpc_io_thread+0x15f5/0x36a0 net/rxrpc/io_thread.c:483
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245