INFO: task syz.0.47:6029 blocked for more than 184 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.47 state:D stack:24496 pid:6029 ppid:5780 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
do_uevent+0x1ed/0x490 fs/dlm/lockspace.c:210
new_lockspace fs/dlm/lockspace.c:633 [inline]
__dlm_new_lockspace+0x1dca/0x2360 fs/dlm/lockspace.c:693
device_create_lockspace+0xc8/0x350 fs/dlm/user.c:430
device_write+0x875/0xed0 fs/dlm/user.c:622
vfs_write+0x299/0x9a0 fs/read_write.c:582
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fca3699e019
RSP: 002b:00007fca37907028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fca36c25fa0 RCX: 00007fca3699e019
RDX: 0000000000000080 RSI: 0000200000000400 RDI: 0000000000000007
RBP: 00007fca36a3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca36c26038 R14: 00007fca36c25fa0 R15: 00007ffee77df068
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by klogd/5126:
1 lock held by udevd/5137:
3 locks held by crond/5511:
2 locks held by getty/5527:
#0: ffff88802d1320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
8 locks held by kworker/1:5/5809:
#0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
#1: ffffc900047afd00 (console_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#1: ffffc900047afd00 (console_work){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
#2: ffffffff8d126180 (console_lock){+.+.}-{0:0}, at: console_callback+0x6a/0x440 drivers/tty/vt/vt.c:2933
#3: ffff88802146c280 (&helper->lock){+.+.}-{3:3}, at: drm_fb_helper_pan_display+0xbe/0xbd0 drivers/gpu/drm/drm_fb_helper.c:1436
#4: ffff8880213381b0 (&dev->master_mutex){+.+.}-{3:3}, at: drm_master_internal_acquire+0x20/0x70 drivers/gpu/drm/drm_auth.c:458
#5: ffff88802146c098 (&client->modeset_mutex){+.+.}-{3:3}, at: drm_client_modeset_commit_locked+0x4c/0x4c0 drivers/gpu/drm/drm_client_modeset.c:1158
#6: ffffc900047af570 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_client_modeset_commit_atomic+0x111/0x7b0 drivers/gpu/drm/drm_client_modeset.c:996
#7: ffff88802146b0b0 (crtc_ww_class_mutex){+.+.}-{3:3}, at: modeset_lock+0x2a6/0x620 drivers/gpu/drm/drm_modeset_lock.c:314
1 lock held by syz.0.47/6029:
#0: ffffffff973c9a68 (&ls_lock){+.+.}-{3:3}, at: __dlm_new_lockspace+0xb1/0x2360 fs/dlm/lockspace.c:687
1 lock held by dlm_recoverd/6036:
#0: ffff88807d1d0aa8 (&ls->ls_in_recovery){+.+.}-{3:3}, at: dlm_recoverd+0xa5/0x1e50 fs/dlm/recoverd.c:310
1 lock held by syz-executor/8528:
1 lock held by syz-executor/8530:
2 locks held by syz-executor/8533:
2 locks held by syz.0.292/8785:
1 lock held by cmp/8799:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf59/0xfa0 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8530 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__lock_acquire+0xee8/0x7d80 kernel/locking/lockdep.c:5127
Code: c7 44 24 20 00 00 00 00 eb 06 b0 01 89 44 24 20 48 8b 44 24 58 42 0f b6 04 00 84 c0 0f 85 50 0d 00 00 48 8b 44 24 18 44 8b 20 <48> 83 7d 10 00 0f 84 9d 00 00 00 48 8b 44 24 78 42 0f b6 04 00 84
RSP: 0018:ffffc90002e46560 EFLAGS: 00000046
RAX: ffff888019726550 RBX: 000000000006047a RCX: ffffffff81689802
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff911eb500
RBP: ffffc90002e467a8 R08: dffffc0000000000 R09: 1ffffffff223d6a0
R10: dffffc0000000000 R11: fffffbfff223d6a1 R12: 0000000000020018
R13: ffff888019725a00 R14: ffff8880197264d0 R15: ee0f6b98b878c8ac
FS: 0000555564ef0500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc9c12d0286 CR3: 0000000026a9c000 CR4: 00000000003506e0
Call Trace:
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:878 [inline]
pfn_valid include/linux/mmzone.h:2011 [inline]
__virt_addr_valid+0x128/0x380 arch/x86/mm/physaddr.c:65
kasan_addr_to_slab+0xd/0xd0 mm/kasan/common.c:36
__kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:477
__call_rcu_common kernel/rcu/tree.c:2721 [inline]
call_rcu+0x153/0x900 kernel/rcu/tree.c:2837
fib6_info_release include/net/ip6_fib.h:349 [inline]
fixup_permanent_addr net/ipv6/addrconf.c:3596 [inline]
addrconf_permanent_addr+0x3a4/0xa50 net/ipv6/addrconf.c:3624
addrconf_notify+0x996/0x1010 net/ipv6/addrconf.c:3696
notifier_call_chain+0x18f/0x380 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2077 [inline]
call_netdevice_notifiers net/core/dev.c:2091 [inline]
__dev_notify_flags+0x1ab/0x310 net/core/dev.c:8762
dev_change_flags+0xde/0x1a0 net/core/dev.c:8800
do_setlink+0xb69/0x3f40 net/core/rtnetlink.c:2917
__rtnl_newlink net/core/rtnetlink.c:3715 [inline]
rtnl_newlink+0x1848/0x2170 net/core/rtnetlink.c:3762
rtnetlink_rcv_msg+0x843/0xf90 net/core/rtnetlink.c:6484
netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x4a9/0x6b0 net/socket.c:2201
__do_sys_sendto net/socket.c:2213 [inline]
__se_sys_sendto net/socket.c:2209 [inline]
__x64_sys_sendto+0xde/0xf0 net/socket.c:2209
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7092d5e84e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffebde8e088 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555564ef0500 RCX: 00007f7092d5e84e
RDX: 000000000000002c RSI: 00007f7093b54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffebde8e104 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f7093b54670 R15: 0000000000000000