INFO: task syz.2.576:8129 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.576       state:D stack:28032 pid:8129  tgid:8127  ppid:5598   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7376
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0xccb/0x1bd0 kernel/locking/mutex.c:821
 bdev_open+0x41a/0xe40 block/bdev.c:990
 blkdev_open+0x34e/0x4f0 block/fops.c:674
 do_dentry_open+0x6ab/0x14d0 fs/open.c:996
 vfs_open+0x82/0x3f0 fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x19fa/0x2440 fs/namei.c:5000
 do_file_open+0x20e/0x430 fs/namei.c:5029
 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1434
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82a7d5e98e
RSP: 002b:00007f82a8bf7b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f82a8bf86c0 RCX: 00007f82a7d5e98e
RDX: 000000000002a003 RSI: 00007f82a8bf7c00 RDI: ffffffffffffff9c
RBP: 00007f82a8bf7c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f82a8026038 R14: 00007f82a8025fa0 R15: 00007ffff90bed38
 </TASK>
INFO: task syz.2.576:8132 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.576       state:D stack:28160 pid:8132  tgid:8127  ppid:5598   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7376
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0xccb/0x1bd0 kernel/locking/mutex.c:821
 bdev_open+0x41a/0xe40 block/bdev.c:990
 blkdev_open+0x34e/0x4f0 block/fops.c:674
 do_dentry_open+0x6ab/0x14d0 fs/open.c:996
 vfs_open+0x82/0x3f0 fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0x19fa/0x2440 fs/namei.c:5000
 do_file_open+0x20e/0x430 fs/namei.c:5029
 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1434
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82a7d5e98e
RSP: 002b:00007f82a8bd6b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f82a8bd76c0 RCX: 00007f82a7d5e98e
RDX: 0000000000000000 RSI: 00007f82a8bd6c00 RDI: ffffffffffffff9c
RBP: 00007f82a8bd6c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f82a8026128 R14: 00007f82a8026090 R15: 00007ffff90bed38
 </TASK>

Showing all locks held in the system:
locks held by kworker/0:0/9: 5, on CPU#0:
 #0: ffff888023680d40 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc900000e7d08 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
 #2: ffff88802a8bd1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
 #2: ffff88802a8bd1d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x1bb/0x4420 drivers/usb/core/hub.c:5912
 #3: ffff88802a8f9568 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3265 [inline]
 #3: ffff88802a8f9568 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5477 [inline]
 #3: ffff88802a8f9568 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5720 [inline]
 #3: ffff88802a8f9568 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5884 [inline]
 #3: ffff88802a8f9568 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x2b3e/0x4420 drivers/usb/core/hub.c:5966
 #4: ffff88802a7ef660 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5478 [inline]
 #4: ffff88802a7ef660 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5720 [inline]
 #4: ffff88802a7ef660 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5884 [inline]
 #4: ffff88802a7ef660 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x2b67/0x4420 drivers/usb/core/hub.c:5966
locks held by pr/ttyS0/16: 1, last CPU#0:
 #0: ffffffff8edd88b8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
 #0: ffffffff8edd88b8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:439 [inline]
 #0: ffffffff8edd88b8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x49/0x60 kernel/printk/printk.c:291
locks held by khungtaskd/31: 1, last CPU#0:
 #0: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by getty/5361: 2, on CPU#1:
 #0: ffff88803644b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032262e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
locks held by udevd/5836: 1, on CPU#1:
 #0: ffff888027e20350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by udevd/5865: 1, on CPU#1:
 #0: ffff888027d0c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by udevd/5880: 1, on CPU#0:
 #0: ffff888027d08350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by udevd/6074: 1, on CPU#0:
 #0: ffff888027c2c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by syz.2.576/8129: 1, on CPU#0:
 #0: ffff888027d0c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by syz.2.576/8132: 1, on CPU#0:
 #0: ffff888027d0c350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by udevd/8603: 1, on CPU#1:
 #0: ffff888027e24350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by syz.4.918/9395: 1, on CPU#0:
 #0: ffff888056f421b0 (&tty->legacy_mutex){+.+.}-{4:4}, at: tty_release+0x86/0x1300 drivers/tty/tty_io.c:1700
locks held by syz.5.941/9480: 2, last CPU#0:
 #0: ffff88802c63d900 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
 #0: ffff88802c63d900 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0xec/0x240 mm/madvise.c:1789
 #1: ffffe8ffffc27e68 (&acomp_ctx->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:853 [inline]
 #1: ffffe8ffffc27e68 (&acomp_ctx->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1422 [inline]
 #1: ffffe8ffffc27e68 (&acomp_ctx->mutex){+.+.}-{4:4}, at: zswap_store+0xd16/0x2e70 mm/zswap.c:1533
locks held by syz.0.949/9519: 1, on CPU#1:
 #0: ffff888035521bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff888035521bc0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
locks held by syz.0.949/9520: 2, last CPU#1:
 #0: ffff888035521bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
 #0: ffff888035521bc0 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0xec/0x240 mm/madvise.c:1789
 #1: ffffe8ffffd27e68 (&acomp_ctx->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:853 [inline]
 #1: ffffe8ffffd27e68 (&acomp_ctx->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1422 [inline]
 #1: ffffe8ffffd27e68 (&acomp_ctx->mutex){+.+.}-{4:4}, at: zswap_store+0xd16/0x2e70 mm/zswap.c:1533
locks held by syz-executor/9525: 5, last CPU#1:
 #0: ffffffff90cbbf48 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff908e3168 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff908e2ee8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
 #3: ffff888034a19020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
 #4: ffff88801d2c7180 (&root->kernfs_rwsem){++++}-{4:4}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #4: ffff88801d2c7180 (&root->kernfs_rwsem){++++}-{4:4}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #4: ffff88801d2c7180 (&root->kernfs_rwsem){++++}-{4:4}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #4: ffff88801d2c7180 (&root->kernfs_rwsem){++++}-{4:4}, at: unwind_next_frame+0xbd/0x2090 arch/x86/kernel/unwind_orc.c:495

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

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 08/05/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x141/0x190 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xcb1/0x1030 kernel/hung_task.c:561
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9525 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:trace_lock_release include/trace/events/lock.h:68 [inline]
RIP: 0010:lock_release+0x40/0x310 kernel/locking/lockdep.c:5954
Code: 2d 2d 96 a5 12 48 89 6c 24 10 48 89 f5 0f 1f 44 00 00 65 8b 05 49 96 a5 12 83 f8 07 0f 87 07 02 00 00 48 0f a3 05 58 e0 5d 0f <0f> 82 02 02 00 00 8b 3d f8 11 5e 0f 85 ff 0f 84 4a 01 00 00 65 8b
RSP: 0018:ffffc90006b575d8 EFLAGS: 00000297
RAX: 0000000000000001 RBX: ffffffff8edec5a0 RCX: 0000000000000000
RDX: ffff888029e68000 RSI: ffffffff82c520ae RDI: ffffffff8edec5a0
RBP: ffffffff82c520ae R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88801d2c7118 R14: 0000000000000000 R15: ffff88801d2c7118
FS:  0000555557d49500(0000) GS:ffff888123c4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ad62edb300 CR3: 0000000035efd000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_lock_release include/linux/rcupdate.h:319 [inline]
 rcu_read_unlock include/linux/rcupdate.h:880 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
 kernfs_root+0xf3/0x2a0 fs/kernfs/kernfs-internal.h:76
 kernfs_active+0x5c/0x110 fs/kernfs/dir.c:40
 kernfs_activate_one+0x99/0x290 fs/kernfs/dir.c:1435
 kernfs_activate fs/kernfs/dir.c:1466 [inline]
 kernfs_add_one+0x5ec/0xaa0 fs/kernfs/dir.c:868
 __kernfs_create_file+0x295/0x350 fs/kernfs/file.c:1079
 sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:316
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x593/0xfb0 fs/sysfs/group.c:189
 internal_create_groups+0x9d/0x150 fs/sysfs/group.c:229
 setup_port+0x409/0x16e0 drivers/infiniband/core/sysfs.c:1202
 ib_setup_port_attrs+0x201/0x600 drivers/infiniband/core/sysfs.c:1388
 add_one_compat_dev+0x5b3/0x820 drivers/infiniband/core/device.c:1002
 rdma_dev_init_net+0x30a/0x590 drivers/infiniband/core/device.c:1227
 ops_init+0x1e2/0x5f0 net/core/net_namespace.c:137
 setup_net+0x118/0x3a0 net/core/net_namespace.c:443
 copy_net_ns+0x345/0x7a0 net/core/net_namespace.c:582
 create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0xf2/0x220 kernel/nsproxy.c:234
 ksys_unshare+0x4a2/0xa70 kernel/fork.c:3297
 __do_sys_unshare kernel/fork.c:3361 [inline]
 __se_sys_unshare kernel/fork.c:3359 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3359
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f501959f427
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc97b54068 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f5019825f40 RCX: 00007f501959f427
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f50198267b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffc97b542a8 R15: 0000000000000000
 </TASK>
virtqueue callback for ffff888026f15200 (ffffffff86ec68b0)
kcov: kcov_remote_start: handle = 100000000000002, context: softirq
kcov: kcov_start: t = ffff88801eed8000, size = 262144, area = ffffc900020e1000
kcov: kcov_move_area: ffffc90016c3b000 1048576 <= ffffc900020e1000 22
No more buffers in queue
Receiving skb proto 0x0806 len 28 type 1
No more buffers in queue
eth0: xmit ffff88805d624280 42:01:0a:80:00:01
Added buffer head 5 to ffff888026f15000
virtqueue callback for ffff888026f15000 (ffffffff86ecf660)
Sent skb ffff88805d624280
No more buffers in queue
kcov: kcov_remote_start: handle = 100000000000002, context: softirq
kcov: kcov_start: t = ffff88801eed8000, size = 262144, area = ffffc900020e1000
kcov: kcov_move_area: ffffc90016c3b000 1048576 <= ffffc900020e1000 22
kcov: kcov_remote_start: handle = 100000000000002, context: softirq
kcov: kcov_start: t = ffff88801eed8000, size = 262144, area = ffffc900020e1000
kcov: kcov_move_area: ffffc90016c3b000 1048576 <= ffffc900020e1000 22
kcov: kcov_remote_start: handle = 100000000000002, context: softirq
kcov: kcov_start: t = ffff88801eed8000, size = 262144, area = ffffc900020e1000
kcov: kcov_move_area: ffffc90016c3b000 1048576 <= ffffc900020e1000 22
kcov: kcov_remote_start: handle = 100000000000002, context: softirq
kcov: kcov_start: t = ffff88801eed8000, size = 262144, area = ffffc900020e1000
kcov: kcov_move_area: ffffc90016c3b000 1048576 <= ffffc900020e1000 22