INFO: task syz.2.5612:24029 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.5612 state:D stack:25424 pid:24029 ppid:15368 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
request_wait_answer fs/fuse/dev.c:407 [inline]
__fuse_request_send fs/fuse/dev.c:426 [inline]
fuse_simple_request+0x11d0/0x1c20 fs/fuse/dev.c:513
fuse_flush+0x655/0x890 fs/fuse/file.c:548
filp_close+0xaa/0x150 fs/open.c:1433
__range_close fs/file.c:703 [inline]
__close_range+0x58b/0x780 fs/file.c:753
__do_sys_close_range fs/open.c:1478 [inline]
__se_sys_close_range fs/open.c:1475 [inline]
__x64_sys_close_range+0x76/0x80 fs/open.c:1475
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: 0033:0x7f7ad339bf79
RSP: 002b:00007ffd4b256be8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f7ad3617da0 RCX: 00007f7ad339bf79
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f7ad3617da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f7ad3617cb0 R11: 0000000000000246 R12: 00000000001f17bf
R13: 00007f7ad361618c R14: 00000000001f15c7 R15: 00007f7ad3616180
INFO: task syz.2.5612:24032 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.5612 state:D stack:26832 pid:24032 ppid:15368 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
request_wait_answer fs/fuse/dev.c:407 [inline]
__fuse_request_send fs/fuse/dev.c:426 [inline]
fuse_simple_request+0x11d0/0x1c20 fs/fuse/dev.c:513
fuse_do_getattr+0x339/0xb40 fs/fuse/dir.c:1135
fuse_cache_write_iter fs/fuse/file.c:1337 [inline]
fuse_file_write_iter+0x4cd/0x1250 fs/fuse/file.c:1683
do_iter_readv_writev fs/read_write.c:-1 [inline]
do_iter_write+0x642/0xb10 fs/read_write.c:861
vfs_writev fs/read_write.c:934 [inline]
do_writev+0x27b/0x480 fs/read_write.c:977
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: 0033:0x7f7ad339bf79
RSP: 002b:00007f7ad41bc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f7ad3616090 RCX: 00007f7ad339bf79
RDX: 0000000000000001 RSI: 0000200000000200 RDI: 0000000000000005
RBP: 00007f7ad34327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7ad3616128 R14: 00007f7ad3616090 R15: 00007ffd4b256a88
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cb2dfb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cb2e7d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
1 lock held by klogd/3626:
#0: ffff8880b8e3ab18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xa5/0x140 kernel/sched/core.c:546
2 locks held by getty/4025:
#0: ffff88814d6c8098 (&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+0x429/0x1390 drivers/tty/n_tty.c:2198
2 locks held by kworker/u4:16/15785:
3 locks held by kworker/u4:17/16632:
2 locks held by syz.2.5612/24032:
#0: ffff8880776599e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ae/0x360 fs/file.c:1038
#1: ffff888079810460 (sb_writers#13){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:933 [inline]
#1: ffff888079810460 (sb_writers#13){.+.+}-{0:0}, at: do_writev+0x25d/0x480 fs/read_write.c:977
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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+0xeee/0xf30 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16632 Comm: kworker/u4:17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:toggle_allocation_gate+0xc1/0x470 mm/kfence/core.c:822
Code: ce c1 8c be 04 00 00 00 e8 ec a7 ff ff c7 05 e2 14 ee 0a 00 00 00 00 48 c7 c7 a0 0b c6 96 e8 36 ec d6 ff 48 c7 c0 a0 cd 1f 8e <48> c1 e8 03 42 80 3c 38 00 74 0c 48 c7 c7 a0 cd 1f 8e e8 18 a6 ff
RSP: 0018:ffffc90003c57b20 EFLAGS: 00000293
RAX: ffffffff8e1fcda0 RBX: ffff8880192fcd18 RCX: ffff88802c123b80
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90003c57c30 R08: ffffffff8e1fcb6f R09: 1ffffffff1c3f96d
R10: dffffc0000000000 R11: fffffbfff1c3f96e R12: dffffc0000000000
R13: 1ffff9200078af64 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555aa9a61660 CR3: 000000000c88e000 CR4: 00000000003506f0
Call Trace:
process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295