INFO: task syz.4.97:5003 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.97 state:D stack:25096 pid:5003 ppid:4266 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:2168
gfs2_gl_hash_clear+0x1a2/0x2f0 fs/gfs2/glock.c:2263
gfs2_fill_super+0x1699/0x1f80 fs/gfs2/ops_fstype.c:1304
get_tree_bdev+0x3f1/0x610 fs/super.c:1366
gfs2_get_tree+0x4d/0x1e0 fs/gfs2/ops_fstype.c:1327
vfs_get_tree+0x88/0x270 fs/super.c:1573
do_new_mount+0x24a/0xa40 fs/namespace.c:3078
do_mount fs/namespace.c:3421 [inline]
__do_sys_mount fs/namespace.c:3629 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa30a190eea
RSP: 002b:00007fa30af92e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa30af92ef0 RCX: 00007fa30a190eea
RDX: 000020000001f680 RSI: 000020000001f6c0 RDI: 00007fa30af92eb0
RBP: 000020000001f680 R08: 00007fa30af92ef0 R09: 0000000000000084
R10: 0000000000000084 R11: 0000000000000246 R12: 000020000001f6c0
R13: 00007fa30af92eb0 R14: 000000000001f7c6 R15: 0000200000000540
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c92bab0 (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: ffffffff8c92c2d0 (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/27:
#0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
1 lock held by khugepaged/34:
2 locks held by getty/4027:
#0: ffff88807e010098 (&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+0x41b/0x1380 drivers/tty/n_tty.c:2198
2 locks held by kworker/u4:15/4842:
1 lock held by syz.4.97/5003:
#0: ffff88802d6520e0 (&type->s_umount_key#70/1){+.+.}-{3:3}, at: alloc_super+0x1fa/0x930 fs/super.c:228
1 lock held by syz.1.203/5518:
#0: ffff88802d6520e0 (&type->s_umount_key#95){.+.+}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:755
1 lock held by syz.5.210/5535:
#0: ffff88802d6520e0 (&type->s_umount_key#95){.+.+}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:755
1 lock held by syz.5.210/5540:
#0: ffff88802d6520e0 (&type->s_umount_key#95){.+.+}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:755
4 locks held by kworker/0:9/6468:
#0: ffff888142ef4138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc90026a57d00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#2: ffff88802851d190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
#2: ffff88802851d190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1a7/0x54e0 drivers/usb/core/hub.c:5845
#3: ffff88802f7cb190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline]
#3: ffff88802f7cb190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x85/0x460 drivers/base/dd.c:990
2 locks held by syz.6.575/7442:
1 lock held by syz.7.576/7446:
#0: ffffffff8c930cc0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x600 kernel/rcu/tree.c:4023
1 lock held by syz.2.578/7454:
6 locks held by syz.2.578/7455:
#0: ffffffff8c91f3c0 (console_lock){+.+.}-{0:0}, at: vt_ioctl+0x189a/0x1b20 drivers/tty/vt/vt_ioctl.c:921
#1: ffff888024830a78 (&helper->lock){+.+.}-{3:3}, at: drm_fb_helper_pan_display+0xba/0xbd0 drivers/gpu/drm/drm_fb_helper.c:1573
#2: ffff88801c3a41a8 (&dev->master_mutex){+.+.}-{3:3}, at: drm_master_internal_acquire+0x1c/0x70 drivers/gpu/drm/drm_auth.c:457
#3: ffff888024830898 (&client->modeset_mutex){+.+.}-{3:3}, at: drm_client_modeset_commit_locked+0x48/0x4c0 drivers/gpu/drm/drm_client_modeset.c:1162
#4: ffffc900039975d0 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_client_modeset_commit_atomic+0xdd/0x760 drivers/gpu/drm/drm_client_modeset.c:1000
#5: ffff88801a7640b0 (crtc_ww_class_mutex){+.+.}-{3:3}, at: ww_mutex_lock_slow include/linux/ww_mutex.h:299 [inline]
#5: ffff88801a7640b0 (crtc_ww_class_mutex){+.+.}-{3:3}, at: modeset_lock+0x2f2/0x630 drivers/gpu/drm/drm_modeset_lock.c:311
=============================================
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 10/25/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3f4/0x470 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7454 Comm: syz.2.578 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:trace_contention_begin+0x4/0x170 include/trace/events/lock.h:95
Code: fe ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 78 ff ff ff 4c 89 f7 e8 5b b2 6e 00 e9 6b ff ff ff 66 0f 1f 44 00 00 41 57 41 56 <41> 55 41 54 53 49 bc 00 00 00 00 00 fc ff df 66 90 65 8b 1d 74 ba
RSP: 0018:ffffc900039875c8 EFLAGS: 00000292
RAX: cdb311d44b892100 RBX: ffff888047bf1d30 RCX: cdb311d44b892100
RDX: 0000000000000000 RSI: 0000000000000021 RDI: ffff888047bf1d30
RBP: ffffc90003987730 R08: dffffc0000000000 R09: fffffbfff211905e
R10: fffffbfff211905e R11: 1ffffffff211905d R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007fb899fcd6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000b6030 CR3: 0000000075228000 CR4: 00000000003526e0
Call Trace:
__mutex_lock_common kernel/locking/mutex.c:605 [inline]
__mutex_lock+0x131/0xaf0 kernel/locking/mutex.c:747
__unix_dgram_recvmsg+0x1df/0xd70 net/unix/af_unix.c:2448
____sys_recvmsg+0x292/0x580 net/socket.c:-1
___sys_recvmsg+0x1b2/0x510 net/socket.c:2780
do_recvmmsg+0x359/0x7d0 net/socket.c:2874
__sys_recvmmsg net/socket.c:2953 [inline]
__do_sys_recvmmsg net/socket.c:2976 [inline]
__se_sys_recvmmsg net/socket.c:2969 [inline]
__x64_sys_recvmmsg+0x18d/0x240 net/socket.c:2969
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb89918f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb899fcd038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fb8993e6090 RCX: 00007fb89918f749
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007fb899213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb8993e6128 R14: 00007fb8993e6090 R15: 00007ffe2fa78768