INFO: task syz.1.216:6735 blocked for more than 143 seconds.
Not tainted 6.16.0-rc2-next-20250619-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.216 state:D stack:27448 pid:6735 tgid:6731 ppid:5830 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5313 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6696
__schedule_loop kernel/sched/core.c:6774 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6789
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6846
rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:869 [inline]
do_lock_mount+0x200/0x510 fs/namespace.c:2859
lock_mount fs/namespace.c:2904 [inline]
do_new_mount_fc fs/namespace.c:3839 [inline]
do_new_mount+0x389/0xa40 fs/namespace.c:3904
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4427
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcaabd8e929
RSP: 002b:00007fcaacc1e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcaabfb6160 RCX: 00007fcaabd8e929
RDX: 0000200000000180 RSI: 0000200000000080 RDI: 0000000000000000
RBP: 00007fcaabe10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcaabfb6160 R15: 00007ffc9c975908
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13ef20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13ef20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13ef20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
4 locks held by kworker/u8:6/1105:
3 locks held by kworker/u8:7/3483:
2 locks held by getty/5590:
#0: ffff88814e4200a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000331b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/5838:
#0: ffff8880b8739f58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606
#1: ffff8880b8723f08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39a/0x6d0 kernel/sched/psi.c:991
3 locks held by syz.1.216/6734:
#0: ffff88807ce52b78 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1217
#1: ffff888054090428 (sb_writers#20){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3099 [inline]
#1: ffff888054090428 (sb_writers#20){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:682
#2: ffff88807d2607b8 (&sb->s_type->i_mutex_key#25){++++}-{4:4}, at: netfs_start_io_direct+0x1ef/0x230 fs/netfs/locking.c:188
1 lock held by syz.1.216/6735:
#0: ffff88807d2607b8 (&sb->s_type->i_mutex_key#25){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
#0: ffff88807d2607b8 (&sb->s_type->i_mutex_key#25){++++}-{4:4}, at: do_lock_mount+0x200/0x510 fs/namespace.c:2859
3 locks held by kworker/u8:15/7506:
#0: ffff88802f818148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#0: ffff88802f818148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3322
#1: ffffc90003097bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3215 [inline]
#1: ffffc90003097bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3322
#2: ffffffff8f519508 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8f519508 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0 net/ipv6/addrconf.c:4198
3 locks held by syz-executor/8421:
#0: ffffffff8f519508 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8f519508 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8f519508 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70 net/core/rtnetlink.c:4054
#1: ffff888031ee14e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x227/0x420 drivers/net/wireguard/device.c:50
#2: ffffffff8e144a38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#2: ffffffff8e144a38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:967
1 lock held by syz.5.668/8749:
#0: ffff8880332f8068 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:727
1 lock held by syz.5.668/8750:
#0: ffff8880332fa468 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x2e/0x440 fs/splice.c:1286
1 lock held by syz.5.668/8753:
#0: ffff8880332fa468 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:727
2 locks held by syz.5.668/8754:
#0: ffff8880332f8068 (&pipe->mutex){+.+.}-{4:4}, at: pipe_lock fs/pipe.c:91 [inline]
#0: ffff8880332f8068 (&pipe->mutex){+.+.}-{4:4}, at: pipe_double_lock+0x6b/0x100 fs/pipe.c:110
#1: ffff8880332fa468 (&pipe->mutex){+.+.}-{4:4}, at: link_pipe fs/splice.c:1863 [inline]
#1: ffff8880332fa468 (&pipe->mutex){+.+.}-{4:4}, at: do_tee+0x1ba/0xe00 fs/splice.c:1964
3 locks held by dhcpcd-run-hook/8770:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc2-next-20250619-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 3483 Comm: kworker/u8:7 Not tainted 6.16.0-rc2-next-20250619-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:memcpy_orig+0x11e/0x130 arch/x86/lib/memcpy_64.S:171
Code: 98 ad 02 00 0f 1f 84 00 00 00 00 00 83 ea 01 72 19 0f b6 0e 74 12 4c 0f b6 46 01 4c 0f b6 0c 16 44 88 47 01 44 88 0c 17 88 0f cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90
RSP: 0018:ffffc9000c6ef6d8 EFLAGS: 00000046
RAX: 00002aaaaaaabb27 RBX: ffffffff8e249b00 RCX: 000000000000000f
RDX: 0000000000000000 RSI: ffffc9000c6ef8f0 RDI: 00002aaaaaaabb27
RBP: ffffc9000c6ef830 R08: 00002aaaaaaabb28 R09: ffff800000000000
R10: dffffc0000000000 R11: fffff520018ddf1e R12: 0000000000000001
R13: 1ffff1100348f8ab R14: 8000000000000063 R15: 00002aaaaaaabb27
FS: 0000000000000000(0000) GS:ffff888125c28000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556654563138 CR3: 000000001a478000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__text_poke+0x633/0xa10 arch/x86/kernel/alternative.c:2529
text_poke arch/x86/kernel/alternative.c:2590 [inline]
smp_text_poke_batch_finish+0xd0a/0x1100 arch/x86/kernel/alternative.c:2979
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240
static_key_disable+0x1a/0x20 kernel/jump_label.c:248
toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:855
process_one_work kernel/workqueue.c:3239 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3322
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245