INFO: task syz.0.636:8573 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc2-next-20250620-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.636       state:D stack:28424 pid:8573  tgid:8570  ppid:5826   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 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
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747
 blk_trace_remove+0x20/0x40 kernel/trace/blktrace.c:406
 sg_ioctl_common drivers/scsi/sg.c:1122 [inline]
 sg_ioctl+0x47b/0x2230 drivers/scsi/sg.c:1156
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 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: 0033:0x7faa40d8e929
RSP: 002b:00007faa41cbf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007faa40fb5fa0 RCX: 00007faa40d8e929
RDX: 0000000020000000 RSI: 0000000000001276 RDI: 000000000000000a
RBP: 00007faa40e10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faa40fb5fa0 R15: 00007ffcc8bd8008
 </TASK>
INFO: task syz.0.636:8581 blocked for more than 144 seconds.
      Not tainted 6.16.0-rc2-next-20250620-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.636       state:D stack:25768 pid:8581  tgid:8570  ppid:5826   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 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
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747
 relay_open+0x3b8/0x920 kernel/relay.c:516
 do_blk_trace_setup+0x561/0x980 kernel/trace/blktrace.c:572
 blk_trace_setup+0x116/0x1f0 kernel/trace/blktrace.c:614
 sg_ioctl_common drivers/scsi/sg.c:1114 [inline]
 sg_ioctl+0xaf3/0x2230 drivers/scsi/sg.c:1156
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 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: 0033:0x7faa40d8e929
RSP: 002b:00007faa41c5c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007faa40fb6240 RCX: 00007faa40d8e929
RDX: 0000200000000b40 RSI: 00000000c0481273 RDI: 000000000000000a
RBP: 00007faa40e10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faa40fb6240 R15: 00007ffcc8bd8008
 </TASK>

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
2 locks held by getty/5590:
 #0: ffff888033f9c0a0 (&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
9 locks held by kworker/u8:9/5996:
4 locks held by kworker/u8:10/6222:
 #0: ffff88801b2fe948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #0: ffff88801b2fe948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3322
 #1: ffffc9000ba77bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3215 [inline]
 #1: ffffc9000ba77bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3322
 #2: ffffffff8e144900 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3792
 #3: ffff8880b8639f58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:614
3 locks held by syz.5.582/8340:
1 lock held by syz.0.636/8573:
 #0: ffff888024fdc3d0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove+0x20/0x40 kernel/trace/blktrace.c:406
2 locks held by syz.0.636/8581:
 #0: ffff888024fdc3d0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:613
 #1: ffffffff8e193228 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:516
2 locks held by syz.4.694/8856:
 #0: ffff88814339f4b8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0xfb/0x1f0 kernel/trace/blktrace.c:613
 #1: ffffffff8e193228 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:516
1 lock held by syz.9.960/9997:
 #0: ffffffff8e144900 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3792
5 locks held by modprobe/10009:

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5816 Comm: syz-executor Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rcu_lockdep_current_cpu_online+0xf1/0x120 kernel/rcu/tree.c:4014
Code: 7d 00 4c 85 3b 75 1a 48 c7 c7 c0 4b 14 8e be 04 00 00 00 e8 11 16 7d 00 83 3d 9a db 6c 0c 00 74 16 b0 01 65 ff 0d ff 2f f8 10 <74> 0f 5b 41 5e 41 5f c3 cc cc cc cc cc 31 c0 eb e8 e8 a9 36 8c ff
RSP: 0018:ffffc9000408f840 EFLAGS: 00000082
RAX: 1ffffffff1c28801 RBX: ffffffff8e144330 RCX: 4386b3a21bf3b000
RDX: ffff88802ada1e00 RSI: ffffffff8be32080 RDI: ffff8880b863af68
RBP: ffffc9000408f8e0 R08: ffff88803111da07 R09: 1ffff11006223b40
R10: dffffc0000000000 R11: ffffed1006223b41 R12: ffff8880b863ad98
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000001
FS:  0000555562413500(0000) GS:ffff888125c26000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa25c8ade9c CR3: 0000000075a00000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
 rcu_read_lock_sched_held+0x74/0x100 kernel/rcu/update.c:124
 task_css_set include/linux/cgroup.h:440 [inline]
 task_dfl_cgroup include/linux/cgroup.h:509 [inline]
 task_psi_group+0x50/0x1a0 kernel/sched/psi.c:884
 psi_account_irqtime+0x169/0x7a0 kernel/sched/psi.c:1013
 __schedule+0x852/0x4d00 kernel/sched/core.c:6689
 __schedule_loop kernel/sched/core.c:6774 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6789
 do_nanosleep+0x1c7/0x600 kernel/time/hrtimer.c:2100
 hrtimer_nanosleep+0x169/0x360 kernel/time/hrtimer.c:2147
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1399 [inline]
 __se_sys_clock_nanosleep+0x2f1/0x380 kernel/time/posix-timers.c:1376
 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: 0033:0x7feb94fc11a3
Code: 1f 84 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d 9e 43 1c 00 00 74 14 b8 e6 00 00 00 0f 05 <f7> d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10
RSP: 002b:00007fff9fcb0a98 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007feb94fc11a3
RDX: 00007fff9fcb0ab0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000007c35b11 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff9fcb0f00
R13: 0000000000000004 R14: 00007fff9fcb0aec R15: 00007fff9fcb0b80
 </TASK>