INFO: task syz.5.2408:15094 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.2408 state:D stack:25528 pid:15094 tgid:15094 ppid:5628 task_flags:0x400040 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
request_wait_answer fs/fuse/dev.c:590 [inline]
__fuse_request_send fs/fuse/dev.c:604 [inline]
__fuse_simple_request+0x12b7/0x1db0 fs/fuse/dev.c:699
fuse_simple_request fs/fuse/fuse_i.h:1262 [inline]
fuse_flush+0x66a/0x8a0 fs/fuse/file.c:500
filp_flush+0xbd/0x190 fs/open.c:1467
filp_close+0x1d/0x40 fs/open.c:1480
__range_close fs/file.c:794 [inline]
__do_sys_close_range fs/file.c:855 [inline]
__se_sys_close_range+0x3d4/0x900 fs/file.c:819
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6fc4f9ce59
RSP: 002b:00007ffef9d39238 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f6fc5217da0 RCX: 00007f6fc4f9ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f6fc5217da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f6fc5217cb0 R11: 0000000000000246 R12: 00000000000d452c
R13: 00007f6fc521609c R14: 00000000000d435a R15: 00007ffef9d39340
INFO: task syz.5.2408:15095 blocked for more than 145 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.2408 state:D stack:25880 pid:15095 tgid:15094 ppid:5628 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
request_wait_answer fs/fuse/dev.c:590 [inline]
__fuse_request_send fs/fuse/dev.c:604 [inline]
__fuse_simple_request+0x12b7/0x1db0 fs/fuse/dev.c:699
fuse_simple_request fs/fuse/fuse_i.h:1262 [inline]
fuse_send_write fs/fuse/file.c:1169 [inline]
fuse_direct_io+0x2139/0x2a10 fs/fuse/file.c:1710
fuse_direct_write_iter fs/fuse/file.c:1805 [inline]
fuse_file_write_iter+0x726/0x10f0 fs/fuse/file.c:1850
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x61d/0xb90 fs/read_write.c:688
ksys_write+0x150/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6fc4f9ce59
RSP: 002b:00007f6fc5ec2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6fc5215fa0 RCX: 00007f6fc4f9ce59
RDX: 00000000fffffdef RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007f6fc5032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6fc5216038 R14: 00007f6fc5215fa0 R15: 00007ffef9d390d8
Showing all locks held in the system:
4 locks held by kworker/0:0/9:
#0: ffff88813fe43140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff88813fe43140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc900000e7c40 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc900000e7c40 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffff888025bc0158 (&helper->damage_lock){....}-{3:3}, at: drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:243 [inline]
#2: ffff888025bc0158 (&helper->damage_lock){....}-{3:3}, at: drm_fb_helper_damage_work+0x198/0x750 drivers/gpu/drm/drm_fb_helper.c:275
#3: ffff888025d52128
(&dev->master_mutex){+.+.}-{4:4}, at: drm_master_internal_acquire+0x20/0x80 drivers/gpu/drm/drm_auth.c:435
1 lock held by khungtaskd/31:
#0: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/0:3/989:
#0: ffff88813fe43140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff88813fe43140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc900050bfc40 (free_ipc_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc900050bfc40 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffffffff8e962fa8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#2: ffffffff8e962fa8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770 kernel/rcu/tree_exp.h:961
5 locks held by kworker/u8:12/3386:
#0: ffff8880b863aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb6/0x150 kernel/sched/core.c:660
#1: ffff8880b8724588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
#2: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: class_wiphy_constructor include/net/cfg80211.h:6645 [inline]
#2: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: cfg80211_wiphy_work+0xb4/0x460 net/wireless/core.c:499
#3: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#3: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#3: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: xa_find+0x8c/0x2b0 lib/xarray.c:2195
#4: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#4: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#4: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
#4: ffffffff8e95cca0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550 arch/x86/kernel/unwind_orc.c:495
2 locks held by dhcpcd/5287:
#0: ffff888033bdd6e8 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0xfe/0x7e0 net/netlink/af_netlink.c:2404
#1: ffffffff8fdd1400 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#1: ffffffff8fdd1400 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200 net/core/rtnetlink.c:6865
2 locks held by getty/5378:
#0: ffff8880327950a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
3 locks held by kworker/u8:3/10133:
#0: ffff88813fe7c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff88813fe7c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc900040e7c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc900040e7c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffffffff8fdd1400 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:313
5 locks held by kworker/u8:16/13522:
#0: ffff88801be86140 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff88801be86140 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc90005a8fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc90005a8fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffffffff8fdc2728 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800 net/core/net_namespace.c:673
#3: ffffffff8fdd1400 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0xe5/0x9e0 net/core/dev.c:13062
#4: ffffffff8e962fa8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#4: ffffffff8e962fa8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770 kernel/rcu/tree_exp.h:961
3 locks held by syz.5.2408/15095:
#0: ffff888081614ef0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320 fs/file.c:1261
#1: ffff888087f9e410 (sb_writers#26){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2724 [inline]
#1: ffff888087f9e410 (sb_writers#26){.+.+}-{0:0}, at: vfs_write+0x227/0xb90 fs/read_write.c:684
#2: ffff888055986680 (&sb->s_type->i_mutex_key#33){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
#2: ffff888055986680 (&sb->s_type->i_mutex_key#33){+.+.}-{4:4}, at: fuse_dio_lock fs/fuse/file.c:-1 [inline]
#2: ffff888055986680 (&sb->s_type->i_mutex_key#33){+.+.}-{4:4}, at: fuse_direct_write_iter fs/fuse/file.c:1796 [inline]
#2: ffff888055986680 (&sb->s_type->i_mutex_key#33){+.+.}-{4:4}, at: fuse_file_write_iter+0x61c/0x10f0 fs/fuse/file.c:1850
1 lock held by syz.4.2744/16933:
#0: ffffffff8fdd1400 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8fdd1400 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x722/0xbe0 net/core/rtnetlink.c:7003
1 lock held by syz.5.2748/16965:
#0: ffffffff8fdd1400 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#0: ffffffff8fdd1400 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_add_ifaddr+0x14d/0x3e0 net/ipv6/addrconf.c:3156
1 lock held by dhcpcd/16969:
#0: ffff88805d510260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88805d510260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe10 net/packet/af_packet.c:3204
1 lock held by dhcpcd/16970:
#0: ffff88805d180260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88805d180260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe10 net/packet/af_packet.c:3204
=============================================
NMI backtrace for cpu 0
CPU: 0 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 04/18/2026
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:162 [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:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
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: 12 Comm: kworker/u8:0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: 0x0 (bat_events)
RIP: 0010:cgroup_ino include/linux/cgroup.h:653 [inline]
RIP: 0010:cgroup_psi include/linux/psi.h:37 [inline]
RIP: 0010:task_psi_group+0xdc/0x1a0 kernel/sched/psi.c:889
Code: f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 4a 49 91 00 4d 8b 36 4d 8d a6 50 01 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 e7 e8 2a 49 91 00 41 bf 88 00 00 00 4d 03 3c 24 4c 89
RSP: 0018:ffffc900001179f0 EFLAGS: 00000046
RAX: 1ffffffff1d33b8a RBX: ffffffff8e81f160 RCX: 0000000080000002
RDX: dffffc0000000000 RSI: ffffffff8e22037a RDI: ffffffff8c28b660
RBP: ffffffff8e81f160 R08: ffff88801d6c8000 R09: 1ffff1100691281d
R10: dffffc0000000000 R11: ffffed100691281e R12: ffffffff8e99dc50
R13: dffffc0000000000 R14: ffffffff8e99db00 R15: ffff88801d6c8000
FS: 0000000000000000(0000) GS:ffff888125387000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556f0e3a78 CR3: 00000000331e6000 CR4: 0000000000350ef0
Call Trace:
psi_task_switch+0x393/0x880 kernel/sched/psi.c:984
psi_sched_switch kernel/sched/stats.h:225 [inline]
__schedule+0x2a66/0x5740 kernel/sched/core.c:7183
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
worker_thread+0xc21/0xfc0 kernel/workqueue.c:3493
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245