INFO: task syz.2.29:6312 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.29        state:D stack:28784 pid: 6312 ppid:  6082 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
 blkdev_common_ioctl+0x1056/0x1ed0 block/ioctl.c:532
 blkdev_ioctl+0x28f/0x6f0 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc212125e79
RSP: 002b:00007fc211768028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc212391090 RCX: 00007fc212125e79
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000004
RBP: 00007fc2121b8ee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc212391128 R14: 00007fc212391090 R15: 00007ffd00022358
 </TASK>
INFO: task syz.1.28:6311 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.28        state:D stack:27888 pid: 6311 ppid:  6080 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
 blkdev_ioctl+0x150/0x6f0 block/ioctl.c:593
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdc7434ee79
RSP: 002b:00007fdc739b2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdc745b9fa0 RCX: 00007fdc7434ee79
RDX: 0000200000000380 RSI: 00000000c0481273 RDI: 0000000000000004
RBP: 00007fdc743e1ee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdc745ba038 R14: 00007fdc745b9fa0 R15: 00007ffdcb4634d8
 </TASK>
INFO: task syz.1.28:6313 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.28        state:D stack:28784 pid: 6313 ppid:  6080 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
 blkdev_common_ioctl+0x1056/0x1ed0 block/ioctl.c:532
 blkdev_ioctl+0x28f/0x6f0 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdc7434ee79
RSP: 002b:00007fdc73991028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdc745ba090 RCX: 00007fdc7434ee79
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000004
RBP: 00007fdc743e1ee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdc745ba128 R14: 00007fdc745ba090 R15: 00007ffdcb4634d8
 </TASK>
INFO: task syz.3.30:6361 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.30        state:D stack:27888 pid: 6361 ppid:  6119 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
 blkdev_ioctl+0x150/0x6f0 block/ioctl.c:593
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdeec4ffe79
RSP: 002b:00007fdeebb63028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdeec76afa0 RCX: 00007fdeec4ffe79
RDX: 0000200000000380 RSI: 00000000c0481273 RDI: 0000000000000004
RBP: 00007fdeec592ee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdeec76b038 R14: 00007fdeec76afa0 R15: 00007ffdfe7dfc18
 </TASK>
INFO: task syz.3.30:6365 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.30        state:D stack:28528 pid: 6365 ppid:  6119 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
 blkdev_common_ioctl+0x1056/0x1ed0 block/ioctl.c:532
 blkdev_ioctl+0x28f/0x6f0 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdeec4ffe79
RSP: 002b:00007fdeebb42028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdeec76b090 RCX: 00007fdeec4ffe79
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000004
RBP: 00007fdeec592ee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdeec76b128 R14: 00007fdeec76b090 R15: 00007ffdfe7dfc18
 </TASK>
INFO: task syz.4.31:6404 blocked for more than 145 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.31        state:D stack:27888 pid: 6404 ppid:  6122 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
 blkdev_ioctl+0x150/0x6f0 block/ioctl.c:593
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f57b96ace79
RSP: 002b:00007f57b8d10028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f57b9917fa0 RCX: 00007f57b96ace79
RDX: 0000200000000380 RSI: 00000000c0481273 RDI: 0000000000000004
RBP: 00007f57b973fee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f57b9918038 R14: 00007f57b9917fa0 R15: 00007ffc81432fd8
 </TASK>
INFO: task syz.4.31:6406 blocked for more than 146 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.31        state:D stack:28784 pid: 6406 ppid:  6122 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
 blkdev_common_ioctl+0x1056/0x1ed0 block/ioctl.c:532
 blkdev_ioctl+0x28f/0x6f0 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f57b96ace79
RSP: 002b:00007f57b8cef028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f57b9918090 RCX: 00007f57b96ace79
RDX: 0000000000000000 RSI: 0000000000001276 RDI: 0000000000000004
RBP: 00007f57b973fee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f57b9918128 R14: 00007f57b9918090 R15: 00007ffc81432fd8
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u4:0/9:
 #0: ffff888016dcd938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc90000ce7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: ffffffff8d430290 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:589
 #3: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x8dd/0xac0 net/core/dev.c:10722
1 lock held by khungtaskd/27:
 #0: ffffffff8c31ef20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/1:2/2856:
 #0: ffff88802ac5fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc9000cbefd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1530 net/ipv6/addrconf.c:4113
2 locks held by getty/3943:
 #0: ffff88814d204098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002d032e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
3 locks held by kworker/0:4/4224:
 #0: ffff88802ac5fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc90002fbfd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1530 net/ipv6/addrconf.c:4113
2 locks held by kworker/1:15/4294:
 #0: ffff888016c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc9000395fd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
2 locks held by syz.2.29/6307:
1 lock held by syz.2.29/6312:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.1.28/6311:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.1.28/6313:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.3.30/6361:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.3.30/6365:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.4.31/6404:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.4.31/6406:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.5.32/6442:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.5.32/6443:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.8.33/6508:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.8.33/6511:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.9.34/6515:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.9.34/6516:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.6.35/6534:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.6.35/6535:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.7.36/6538:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.7.36/6540:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.0.37/6544:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.0.37/6545:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.1.38/6587:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.1.38/6588:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.2.39/6590:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.2.39/6591:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.3.40/6623:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.3.40/6625:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.4.41/6631:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.4.41/6632:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.5.42/6634:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.5.42/6635:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.9.44/6687:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.9.44/6689:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.8.43/6691:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.8.43/6693:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.6.45/6725:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.6.45/6726:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.7.46/6743:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.7.46/6744:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.0.47/6746:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.0.47/6747:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.1.48/6775:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.1.48/6776:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.2.49/6783:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.2.49/6785:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.3.50/6804:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.3.50/6809:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.4.51/6844:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.4.51/6846:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.5.52/6852:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.5.52/6853:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.8.54/6883:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.8.54/6884:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.9.53/6889:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.9.53/6890:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.6.55/6914:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.6.55/6915:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.0.56/6948:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.0.56/6951:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz-executor/6954:
 #0: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7d6/0xf00 net/core/rtnetlink.c:5685
1 lock held by syz.7.57/6959:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.7.57/6960:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
2 locks held by syz-executor/6969:
 #0: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7d6/0xf00 net/core/rtnetlink.c:5685
 #1: ffffffff8c3239a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #1: ffffffff8c3239a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845
1 lock held by syz.1.58/6979:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz.1.58/6981:
 #0: ffff888147b51448 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_ioctl+0x144/0x5a0 kernel/trace/blktrace.c:735
1 lock held by syz-executor/6984:
 #0: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d43c1c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7d6/0xf00 net/core/rtnetlink.c:5685

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe1b/0xe60 kernel/hung_task.c:369
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5797 Comm: kworker/u4:8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:___slab_alloc+0xc90/0xdd0 mm/slub.c:2966
Code: 89 ff be ff ff ff ff e8 0e 73 fc 07 85 c0 0f 84 d3 00 00 00 49 8b 46 10 83 78 28 00 0f 89 3d 01 00 00 8b 43 28 49 8b 44 05 00 <49> 89 06 49 83 46 08 08 48 8b 1b 48 83 c3 20 e8 7c 80 fc 07 41 89
RSP: 0018:ffffc90003887478 EFLAGS: 00000082
RAX: ffff8880aef6d780 RBX: ffff888016c41780 RCX: 3d88b8cd272dcd00
RDX: 000000008020001a RSI: ffffffff8a2b3e80 RDI: ffffffff8a79c980
RBP: 0000000000000246 R08: 0000000000000000 R09: 0000000080200020
R10: dffffc0000000000 R11: fffffbfff2039619 R12: 0000000000000001
R13: ffff8880aef6d680 R14: ffff8880b913ddb0 R15: ffff8880b913ddd0
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005618a962c420 CR3: 000000002fda8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __slab_alloc mm/slub.c:3100 [inline]
 slab_alloc_node mm/slub.c:3191 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 __kmalloc+0x11d/0x340 mm/slub.c:4408
 kmalloc include/linux/slab.h:612 [inline]
 kzalloc include/linux/slab.h:738 [inline]
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2524 [inline]
 cfg80211_inform_bss_frame_data+0x525/0x1ed0 net/wireless/scan.c:2585
 ieee80211_bss_info_update+0x6ba/0xa80 net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1123 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1614 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1763/0x2b50 net/mac80211/ibss.c:1643
 ieee80211_iface_process_skb net/mac80211/iface.c:1459 [inline]
 ieee80211_iface_work+0x714/0xc50 net/mac80211/iface.c:1513
 cfg80211_wiphy_work+0x224/0x260 net/wireless/core.c:433
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>