INFO: task syz.1.1042:9181 blocked for more than 147 seconds.
Not tainted 6.15.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1042 state:D stack:28296 pid:9181 tgid:9180 ppid:5823 task_flags:0x400140 flags:0x00400004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
ptmx_open drivers/tty/pty.c:823 [inline]
ptmx_open+0xff/0x360 drivers/tty/pty.c:790
chrdev_open+0x231/0x6a0 fs/char_dev.c:414
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3a0218e969
RSP: 002b:00007f3a02f6a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f3a023b5fa0 RCX: 00007f3a0218e969
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f3a02210ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3a023b5fa0 R15: 00007ffee7dcf398
</TASK>
Showing all locks held in the system:
2 locks held by kthreadd/2:
2 locks held by kworker/0:0/9:
2 locks held by kworker/0:1/10:
4 locks held by kworker/u8:0/12:
#0: ffff88807f443148 ((wq_completion)wg-kex-wg1#3){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90000117d18 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff888064355308 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0xec/0x650 drivers/net/wireguard/noise.c:529
#3: ffff8880621d20f0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x100/0x650 drivers/net/wireguard/noise.c:530
4 locks held by kworker/1:0/24:
1 lock held by khungtaskd/31:
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
4 locks held by kworker/u8:2/36:
#0: ffff888029fe7948 ((wq_completion)wg-kex-wg2#3){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90000ad7d18 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff888063cc5308 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0xec/0x650 drivers/net/wireguard/noise.c:529
#3: ffff8880626c3ea8 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x100/0x650 drivers/net/wireguard/noise.c:530
4 locks held by kworker/1:1/47:
4 locks held by kworker/u8:3/54:
4 locks held by kworker/u8:4/67:
#0: ffff88802d61e948 ((wq_completion)wg-kex-wg2#7){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90001557d18 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff888063ab5308 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0xec/0x650 drivers/net/wireguard/noise.c:529
#3: ffff8880596a0338 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x100/0x650 drivers/net/wireguard/noise.c:530
2 locks held by kswapd0/89:
3 locks held by kworker/1:2/971:
3 locks held by kworker/0:2/973:
4 locks held by kworker/u8:5/1098:
5 locks held by kworker/u8:6/1107:
4 locks held by kworker/u8:7/2988:
2 locks held by kworker/R-bat_e/3396:
4 locks held by kworker/u8:8/5047:
3 locks held by syslogd/5169:
2 locks held by dhcpcd/5480:
2 locks held by getty/5580:
#0: ffff88803226e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
4 locks held by syz-executor/5809:
3 locks held by syz-executor/5810:
2 locks held by kworker/0:3/5811:
1 lock held by syz-executor/5817:
1 lock held by syz-executor/5820:
4 locks held by kworker/0:4/5863:
#0: ffff888030f35148 ((wq_completion)wg-kex-wg1#4){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90002ee7d18 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __asm__ ("" : "=r"(__ptr) : "0"((__typeof__(*((worker))) *)(( unsigned long)((worker))))); (typeof((__typeof__(*((worker))) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff888064355308 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x1c2/0x880 drivers/net/wireguard/noise.c:598
#3: ffff8880621d20f0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x666/0x880 drivers/net/wireguard/noise.c:643
3 locks held by kworker/0:6/5865:
4 locks held by kworker/1:4/5867:
2 locks held by kworker/1:6/5896:
4 locks held by kworker/1:8/5917:
2 locks held by syz.1.25/5995:
3 locks held by kworker/u8:9/6006:
4 locks held by kworker/u8:10/6312:
2 locks held by syz.1.982/9005:
1 lock held by syz.1.1042/9181:
#0: ffffffff8f0a59a8 (tty_mutex){+.+.}-{4:4}, at: ptmx_open drivers/tty/pty.c:823 [inline]
#0: ffffffff8f0a59a8 (tty_mutex){+.+.}-{4:4}, at: ptmx_open+0xff/0x360 drivers/tty/pty.c:790
1 lock held by syz.4.1051/9206:
2 locks held by kworker/u8:11/9210:
4 locks held by syz-executor/9211:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 3396 Comm: kworker/R-bat_e Not tainted 6.15.0-rc4-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: bat_events batadv_dat_purge
RIP: 0010:ether_addr_equal_64bits include/linux/etherdevice.h:384 [inline]
RIP: 0010:eth_skb_pkt_type include/linux/etherdevice.h:627 [inline]
RIP: 0010:eth_type_trans+0x2a6/0x7a0 net/ethernet/eth.c:165
Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8a 04 00 00 4c 89 fa 49 8b 6d 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 5e 04 00 00 4d 8b 2f 31 ff 49 31 ed 49 c1 e5 10 4c 89 ee e8
RSP: 0018:ffffc90000a07830 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88816e2d8000 RCX: ffffffff89688932
RDX: 1ffff11006bc0825 RSI: ffffffff89688941 RDI: ffff888063ef2468
RBP: aaaa020000003333 R08: 0000000000000003 R09: 000000000000ffff
R10: 0000000000000002 R11: 0000000000000000 R12: ffff888063ef2000
R13: ffff88802ec823c2 R14: ffff88802ec823c2 R15: ffff888035e04128
FS: 0000000000000000(0000) GS:ffff888124ae4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f608616aff8 CR3: 000000000e180000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__dev_forward_skb2+0x3b6/0x750 net/core/dev.c:2370
veth_forward_skb drivers/net/veth.c:321 [inline]
veth_xmit+0x2ae/0xad0 drivers/net/veth.c:376
__netdev_start_xmit include/linux/netdevice.h:5203 [inline]
netdev_start_xmit include/linux/netdevice.h:5212 [inline]
xmit_one net/core/dev.c:3776 [inline]
dev_hard_start_xmit+0x93/0x740 net/core/dev.c:3792
__dev_queue_xmit+0x7eb/0x43e0 net/core/dev.c:4629
dev_queue_xmit include/linux/netdevice.h:3350 [inline]
br_dev_queue_push_xmit+0x272/0x8a0 net/bridge/br_forward.c:53
br_nf_dev_queue_xmit+0x6f3/0x2cb0 net/bridge/br_netfilter_hooks.c:923
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
br_nf_post_routing+0x8e7/0x1190 net/bridge/br_netfilter_hooks.c:969
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626
nf_hook+0x45e/0x780 include/linux/netfilter.h:269
NF_HOOK include/linux/netfilter.h:312 [inline]
br_forward_finish+0xcd/0x130 net/bridge/br_forward.c:66
br_nf_hook_thresh+0x301/0x410 net/bridge/br_netfilter_hooks.c:1170
br_nf_forward_finish+0x66a/0xba0 net/bridge/br_netfilter_hooks.c:665
NF_HOOK include/linux/netfilter.h:314 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
br_nf_forward_ip.part.0+0x609/0x810 net/bridge/br_netfilter_hooks.c:719
br_nf_forward_ip net/bridge/br_netfilter_hooks.c:679 [inline]
br_nf_forward+0xf0f/0x1be0 net/bridge/br_netfilter_hooks.c:776
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626
nf_hook+0x45e/0x780 include/linux/netfilter.h:269
NF_HOOK include/linux/netfilter.h:312 [inline]
__br_forward+0x1be/0x5b0 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xf1/0x180 net/bridge/br_forward.c:190
br_flood+0x17c/0x650 net/bridge/br_forward.c:237
br_handle_frame_finish+0xe8e/0x1c20 net/bridge/br_input.c:220
br_nf_hook_thresh+0x301/0x410 net/bridge/br_netfilter_hooks.c:1170
br_nf_pre_routing_finish_ipv6+0x76a/0xfb0 net/bridge/br_netfilter_ipv6.c:154
NF_HOOK include/linux/netfilter.h:314 [inline]
br_nf_pre_routing_ipv6+0x3cd/0x8c0 net/bridge/br_netfilter_ipv6.c:184
br_nf_pre_routing+0x860/0x15b0 net/bridge/br_netfilter_hooks.c:508
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:282 [inline]
br_handle_frame+0xad5/0x14a0 net/bridge/br_input.c:433
__netif_receive_skb_core.constprop.0+0xa23/0x4a00 net/core/dev.c:5773
__netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:5885
__netif_receive_skb+0x1d/0x160 net/core/dev.c:6000
process_backlog+0x442/0x15e0 net/core/dev.c:6352
__napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7324
napi_poll net/core/dev.c:7388 [inline]
net_rx_action+0xa97/0x1010 net/core/dev.c:7510
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
do_softirq kernel/softirq.c:480 [inline]
do_softirq+0xb2/0xf0 kernel/softirq.c:467
</IRQ>
<TASK>
__local_bh_enable_ip+0x100/0x120 kernel/softirq.c:407
spin_unlock_bh include/linux/spinlock.h:396 [inline]
__batadv_dat_purge.part.0+0x279/0x3a0 net/batman-adv/distributed-arp-table.c:185
__batadv_dat_purge net/batman-adv/distributed-arp-table.c:166 [inline]
batadv_dat_purge+0x4b/0xa0 net/batman-adv/distributed-arp-table.c:204
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
rescuer_thread+0x620/0xea0 kernel/workqueue.c:3496
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>