INFO: task syz-executor:10774 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-executor state:D stack:20552 pid:10774 tgid:10774 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5349 [inline]
__schedule+0x1665/0x5590 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7044 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7059
schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2cc/0x5e0 kernel/sched/completion.c:153
__flush_work+0xa17/0xc50 kernel/workqueue.c:4345
gfs2_clear_rgrpd+0x117/0x740 fs/gfs2/rgrp.c:731
gfs2_put_super+0x7d1/0x860 fs/gfs2/super.c:637
generic_shutdown_super+0x13d/0x2d0 fs/super.c:646
kill_block_super+0x44/0x90 fs/super.c:1725
deactivate_locked_super+0xbc/0x130 fs/super.c:476
cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc4fd79d9d7
RSP: 002b:00007ffd477c5fc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fc4fd831f90 RCX: 00007fc4fd79d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd477c6080
RBP: 00007ffd477c6080 R08: 00007ffd477c7080 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd477c7110
R13: 00007fc4fd831f90 R14: 0000000000118629 R15: 00007ffd477c7150
INFO: task kworker/1:2H:12339 blocked for more than 145 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2H state:D stack:27600 pid:12339 tgid:12339 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: gfs2-glock/syz:syz glock_work_func
Call Trace:
context_switch kernel/sched/core.c:5349 [inline]
__schedule+0x1665/0x5590 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7044 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7059
io_schedule+0x7f/0xd0 kernel/sched/core.c:7886
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit_lock+0xec/0x4e0 kernel/sched/wait_bit.c:93
out_of_line_wait_on_bit_lock+0x13b/0x190 kernel/sched/wait_bit.c:120
wait_on_bit_lock_io include/linux/wait_bit.h:221 [inline]
__lock_buffer fs/buffer.c:72 [inline]
lock_buffer include/linux/buffer_head.h:432 [inline]
discard_buffer fs/buffer.c:1603 [inline]
block_invalidate_folio+0x370/0x730 fs/buffer.c:1660
folio_invalidate mm/truncate.c:140 [inline]
truncate_cleanup_folio+0xcb/0x190 mm/truncate.c:160
truncate_inode_pages_range+0x2ce/0xe30 mm/truncate.c:404
do_xmote+0x289/0x760 fs/gfs2/glock.c:699
glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1011
process_one_work+0x963/0x1720 kernel/workqueue.c:3285
process_scheduled_works kernel/workqueue.c:3376 [inline]
worker_thread+0xb46/0x1140 kernel/workqueue.c:3457
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e760560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e760560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e760560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/0:1H/2178:
#0: ffff888055cc8548 ((wq_completion)gfs2-glock/syz:syz){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc90006e07c40 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
2 locks held by getty/5575:
#0: ffff8880377f70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by kworker/1:8/5979:
#0: ffff88801b05b148 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc90004f27c40 (key_gc_work){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
8 locks held by kworker/u8:18/6201:
#0: ffff88801c29e948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc90005a0fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
#2: ffffffff8fbc60b0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800 net/core/net_namespace.c:675
#3: ffff88807a89a0e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
#3: ffff88807a89a0e8 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline]
#3: ffff88807a89a0e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x117/0x3f0 net/devlink/core.c:504
#4: ffff88807a899250 (&devlink->lock_key#14){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:274 [inline]
#4: ffff88807a899250 (&devlink->lock_key#14){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline]
#4: ffff88807a899250 (&devlink->lock_key#14){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x3f0 net/devlink/core.c:504
#5: ffffffff8fbd5008 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x10b/0x730 drivers/net/netdevsim/netdev.c:1177
#6: ffff8880831f8d60 (&dev_instance_lock_key#24){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2789 [inline]
#6: ffff8880831f8d60 (&dev_instance_lock_key#24){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x583/0x2380 net/core/dev.c:12391
#7: ffffffff8e7667f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#7: ffffffff8e7667f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770 kernel/rcu/tree_exp.h:961
1 lock held by syz-executor/10774:
#0: ffff88802c6640e0 (&type->s_umount_key#135){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88802c6640e0 (&type->s_umount_key#135){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88802c6640e0 (&type->s_umount_key#135){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
3 locks held by kworker/u8:3/11697:
#0: ffff888032706148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc90004fc7c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
#2: ffffffff8fbd5008 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8fbd5008 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0 net/ipv6/addrconf.c:4198
2 locks held by kworker/1:2H/12339:
#0: ffff888055cc8548 ((wq_completion)gfs2-glock/syz:syz){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc9000351fc40 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
2 locks held by kworker/R-gfs2-/14523:
#0: ffff888055cc8548 ((wq_completion)gfs2-glock/syz:syz){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc9000349fc00 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
2 locks held by kworker/0:0H/14628:
#0: ffff888055cc8548 ((wq_completion)gfs2-glock/syz:syz){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc9000d0c7c40 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
2 locks held by kworker/0:3H/15251:
#0: ffff888055cc8548 ((wq_completion)gfs2-glock/syz:syz){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc90006aa7c40 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
3 locks held by kworker/u8:8/15395:
#0: ffff88801b09c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x849/0x1720 kernel/workqueue.c:3257
#1: ffffc90003777c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x870/0x1720 kernel/workqueue.c:3258
#2: ffffffff8fbd5008 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:313
1 lock held by syz-executor/15697:
#0: ffffffff8fbd5008 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8fbd5008 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8fbd5008 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0 net/core/rtnetlink.c:4071
1 lock held by dhcpcd/15735:
#0: ffff88807737f448 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#0: ffff88807737f448 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730
1 lock held by dhcpcd/15745:
#0: ffff88807736ca48 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#0: ffff88807736ca48 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730
2 locks held by dhcpcd/15746:
#0: ffff88807736d648 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#0: ffff88807736d648 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730
#1: ffffffff8e7667f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#1: ffffffff8e7667f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770 kernel/rcu/tree_exp.h:961
1 lock held by dhcpcd/15747:
#0: ffff8880349d4260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1714 [inline]
#0: ffff8880349d4260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe70 net/packet/af_packet.c:3197
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: kworker/u8:2 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:stack_depot_save_flags+0x48/0x810 lib/stackdepot.c:669
Code: 0f 83 48 01 00 00 41 89 d5 49 89 fe 89 4c 24 04 e8 4d dc c4 fc 41 89 c2 31 c0 45 85 d2 0f 84 d6 03 00 00 80 3d 68 6c 71 15 00 <0f> 85 c9 03 00 00 43 8d 34 12 42 8d 2c d5 7b 71 f5 75 83 fe 04 72
RSP: 0018:ffffc90000ab76d8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000082801 RCX: 0000000000000001
RDX: 0000000000082800 RSI: 000000000000000a RDI: ffffc90000ab7730
RBP: ffffc90000ab7958 R08: 000000000000001e R09: ffffffff8e760560
R10: 000000000000000a R11: ffffffff81b0f9c0 R12: ffff88801b034140
R13: 0000000000082820 R14: ffffc90000ab7730 R15: ffffc90000ab7730
FS: 0000000000000000(0000) GS:ffff888125448000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ab05c4a660 CR3: 000000007a836000 CR4: 00000000003526f0
Call Trace:
kasan_save_stack mm/kasan/common.c:58 [inline]
kasan_save_track+0x4f/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5262 [inline]
__kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5370
kmalloc_reserve net/core/skbuff.c:635 [inline]
__alloc_skb+0x2c1/0x7d0 net/core/skbuff.c:713
alloc_skb include/linux/skbuff.h:1383 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:819 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:876 [inline]
nsim_dev_trap_report_work+0x29a/0xb80 drivers/net/netdevsim/dev.c:922
process_one_work+0x963/0x1720 kernel/workqueue.c:3285
process_scheduled_works kernel/workqueue.c:3376 [inline]
worker_thread+0xb46/0x1140 kernel/workqueue.c:3457
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245