INFO: task syz.1.186:4870 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.186 state:D stack:27888 pid:4870 ppid:4272 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
trace_array_get kernel/trace/trace.c:461 [inline]
tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
tracing_open_file_tr+0xab/0x2f0 kernel/trace/trace.c:4892
do_dentry_open+0x7dd/0x10b0 fs/open.c:882
do_open fs/namei.c:3677 [inline]
path_openat+0x2674/0x2f10 fs/namei.c:3834
do_filp_open+0x1ee/0x420 fs/namei.c:3861
do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
do_sys_open fs/open.c:1336 [inline]
__do_sys_openat fs/open.c:1352 [inline]
__se_sys_openat fs/open.c:1347 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1347
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4e09b9e199
RSP: 002b:00007f4e0ab5a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4e09e25fa0 RCX: 00007f4e09b9e199
RDX: 0000000000000002 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f4e09c358e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e09e26038 R14: 00007f4e09e25fa0 R15: 00007ffd296ec818
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cb2e230 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cb2ea50 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffffffff8cb2d8a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8cb2d8a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8cb2d8a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6669
2 locks held by getty/4028:
#0: ffff888030399098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41e/0x1360 drivers/tty/n_tty.c:2198
2 locks held by kworker/1:4/4322:
#0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90004517d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
5 locks held by syz.3.151/4775:
1 lock held by syz.1.186/4870:
#0: ffffffff8cb774c8 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
#0: ffffffff8cb774c8 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr kernel/trace/trace.c:511 [inline]
#0: ffffffff8cb774c8 (trace_types_lock){+.+.}-{3:3}, at: tracing_open_file_tr+0xab/0x2f0 kernel/trace/trace.c:4892
2 locks held by syz.2.341/5337:
#0: ffff88801dae2460 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402
#1: ffffffff8cb774c8 (trace_types_lock){+.+.}-{3:3}, at: trace_array_get kernel/trace/trace.c:461 [inline]
#1: ffffffff8cb774c8 (trace_types_lock){+.+.}-{3:3}, at: tracing_check_open_get_tr+0x57/0x100 kernel/trace/trace.c:511
3 locks held by kworker/u4:18/7502:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1:
ffffc90021a9fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#2: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263
2 locks held by syz.6.1219/8880:
#0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
#0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3d/0x1b0 drivers/net/tun.c:3506
#1:
ffffffff8cb33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
ffffffff8cb33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2ec/0x890 kernel/rcu/tree_exp.h:962
1 lock held by syz.5.1220/8875:
#0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
#0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3d/0x1b0 drivers/net/tun.c:3506
1 lock held by syz.5.1220/8881:
#0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x54d/0xe80 net/core/dev_ioctl.c:571
1 lock held by syz.0.1230/8918:
#0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
#0: ffffffff8dd56d68 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3d/0x1b0 drivers/net/tun.c:3506
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf0e/0xf50 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4775 Comm: syz.3.151 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:lock_release+0x6/0x920 kernel/locking/lockdep.c:5798
Code: 03 38 c1 0f 8c 67 fa ff ff 4c 89 f7 e8 83 1d 6f 00 e9 5a fa ff ff 41 be 2f 00 00 00 e9 70 fa ff ff 0f 1f 00 55 48 89 e5 41 57 <41> 56 41 55 41 54 53 48 83 e4 e0 48 81 ec e0 00 00 00 48 89 74 24
RSP: 0018:ffffc9000557eee8 EFLAGS: 00000287
RAX: 0000000000000000 RBX: ffffffff81da03d8 RCX: 76a2fec9c7ecfa00
RDX: ffffc9000ece9000 RSI: ffffffff81da03d8 RDI: ffffffff8cb2d8a0
RBP: ffffc9000557eef0 R08: dffffc0000000000 R09: 1ffffffff2166648
R10: dffffc0000000000 R11: fffffbfff2166649 R12: ffff88813fffa000
R13: 0000000000000000 R14: ffff8880799d2000 R15: dffffc0000000000
FS: 00007fd3b7bf66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb7403f12f8 CR3: 0000000019e6e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_lock_release include/linux/rcupdate.h:355 [inline]
rcu_read_unlock include/linux/rcupdate.h:824 [inline]
mem_cgroup_iter+0x36b/0x4a0 mm/memcontrol.c:1171
shrink_node_memcgs mm/vmscan.c:6163 [inline]
shrink_node+0x83d/0x2890 mm/vmscan.c:6183
shrink_zones mm/vmscan.c:6424 [inline]
do_try_to_free_pages+0x650/0x1980 mm/vmscan.c:6486
try_to_free_mem_cgroup_pages+0x335/0x8c0 mm/vmscan.c:6801
try_charge_memcg+0x5da/0x17c0 mm/memcontrol.c:2684
obj_cgroup_charge_pages mm/memcontrol.c:3099 [inline]
obj_cgroup_charge+0x36a/0x620 mm/memcontrol.c:3390
memcg_slab_pre_alloc_hook mm/slab.h:501 [inline]
slab_pre_alloc_hook+0x2e2/0x300 mm/slab.h:715
slab_alloc_node mm/slub.c:3279 [inline]
slab_alloc mm/slub.c:3367 [inline]
__kmem_cache_alloc_lru mm/slub.c:3374 [inline]
kmem_cache_alloc_lru+0x49/0x2e0 mm/slub.c:3390
__d_alloc+0x2e/0x6e0 fs/dcache.c:1774
d_alloc fs/dcache.c:1854 [inline]
d_alloc_parallel+0xdc/0x1590 fs/dcache.c:2647
__lookup_slow+0x134/0x3f0 fs/namei.c:1683
lookup_one_len+0x19d/0x2d0 fs/namei.c:2791
start_creating+0x113/0x200 fs/tracefs/inode.c:426
__create_dir+0x24/0x530 fs/tracefs/inode.c:515
event_subsystem_dir kernel/trace/trace_events.c:2488 [inline]
event_create_dir+0x4bd/0xe50 kernel/trace/trace_events.c:2582
__trace_add_new_event kernel/trace/trace_events.c:3078 [inline]
__trace_add_event_dirs kernel/trace/trace_events.c:3292 [inline]
event_trace_add_tracer+0x19b/0x3a0 kernel/trace/trace_events.c:3891
trace_array_create_dir+0x77/0x120 kernel/trace/trace.c:9441
trace_array_create+0x724/0xcb0 kernel/trace/trace.c:9499
instance_mkdir+0xc8/0x120 kernel/trace/trace.c:9534
tracefs_syscall_mkdir+0xb7/0x110 fs/tracefs/inode.c:87
vfs_mkdir+0x386/0x570 fs/namei.c:4157
do_mkdirat+0x1d8/0x440 fs/namei.c:4182
__do_sys_mkdirat fs/namei.c:4197 [inline]
__se_sys_mkdirat fs/namei.c:4195 [inline]
__x64_sys_mkdirat+0x85/0x90 fs/namei.c:4195
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd3b999e199
Code: Unable to access opcode bytes at 0x7fd3b999e16f.
RSP: 002b:00007fd3b7bf6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fd3b9c25fa0 RCX: 00007fd3b999e199
RDX: 00000000000001ff RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007fd3b9a358e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd3b9c26038 R14: 00007fd3b9c25fa0 R15: 00007ffd2a28d128