INFO: task syz.1.630:8787 blocked for more than 143 seconds.
Not tainted 6.14.0-rc2-next-20250214-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.630 state:D stack:22000 pid:8787 tgid:8745 ppid:5843 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5373 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6760
__schedule_loop kernel/sched/core.c:6837 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6852
wait_on_inode+0x158/0x230 include/linux/writeback.h:206
iget5_locked_rcu+0xc7/0x1c0 fs/inode.c:1434
btrfs_iget_locked fs/btrfs/inode.c:5629 [inline]
btrfs_iget+0x167/0x2b0 fs/btrfs/inode.c:5669
btrfs_lookup_dentry+0x407/0x1640 fs/btrfs/inode.c:5758
btrfs_lookup+0x1d/0x40 fs/btrfs/inode.c:5823
lookup_open fs/namei.c:3637 [inline]
open_last_lookups fs/namei.c:3758 [inline]
path_openat+0x11cc/0x35b0 fs/namei.c:3994
do_filp_open+0x282/0x4e0 fs/namei.c:4024
do_sys_openat2+0x13f/0x1c0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_open fs/open.c:1451 [inline]
__se_sys_open fs/open.c:1447 [inline]
__x64_sys_open+0x225/0x280 fs/open.c:1447
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f672f18cde9
RSP: 002b:00007f672cff6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f672f3a6160 RCX: 00007f672f18cde9
RDX: 0000000000000086 RSI: 0000000000064842 RDI: 0000400000000080
RBP: 00007f672f20e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f672f3a6160 R15: 00007fff1b0e8928
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8eb3b520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8eb3b520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8eb3b520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
4 locks held by kworker/u8:4/59:
#0: ffff88801bef5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff88801bef5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317
#1: ffffc9000200fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000200fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317
#2: ffffffff8fed2d50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x17a/0xd60 net/core/net_namespace.c:606
#3: ffff88807fc3d4e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_destruct+0x110/0x2e0 drivers/net/wireguard/device.c:249
2 locks held by dhcpcd/5498:
#0: ffffffff8fec4488 (vlan_ioctl_mutex){+.+.}-{4:4}, at: sock_ioctl+0x661/0x8e0 net/socket.c:1280
#1: ffffffff8fedf4c8 (rtnl_mutex){+.+.}-{4:4}, at: vlan_ioctl_handler+0x112/0x9d0 net/8021q/vlan.c:553
2 locks held by getty/5591:
#0: ffff8880358810a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000331b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
3 locks held by kworker/u8:14/7282:
#0: ffff8880b873e958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
#1: ffffc9000479fc60 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000479fc60 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317
#2: ffff8880b872a398 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1046 [inline]
#2: ffff8880b872a398 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x24a/0x10e0 kernel/time/timer.c:1127
2 locks held by syz.1.630/8787:
#0: ffff88804eaa4420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556
#1: ffff88807b9a6420 (&type->i_mutex_dir_key#12){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#1: ffff88807b9a6420 (&type->i_mutex_dir_key#12){++++}-{4:4}, at: open_last_lookups fs/namei.c:3755 [inline]
#1: ffff88807b9a6420 (&type->i_mutex_dir_key#12){++++}-{4:4}, at: path_openat+0x8b2/0x35b0 fs/namei.c:3994
3 locks held by syz-executor/10142:
#0: ffffffff8f680000 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8f680000 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8f680000 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:569
#1: ffffffff8fedf4c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#1: ffffffff8fedf4c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:340 [inline]
#1: ffffffff8fedf4c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc55/0x1d30 net/core/rtnetlink.c:4026
#2: ffffffff8eb40a38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#2: ffffffff8eb40a38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x820 kernel/rcu/tree_exp.h:998
1 lock held by syz.2.942/10276:
#0: ffffffff8eb40900 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3772
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc2-next-20250214-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10142 Comm: syz-executor Not tainted 6.14.0-rc2-next-20250214-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:do_raw_spin_lock+0x30/0x370 kernel/locking/spinlock_debug.c:114
Code: 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec a0 00 00 00 49 89 fc 65 48 8b 04 25 28 00 00 00 48 89 84 24 80 00 00 00 <48> ba 00 00 00 00 00 fc ff df 48 c7 44 24 40 b3 8a b5 41 48 c7 44
RSP: 0018:ffffc9000b5a6780 EFLAGS: 00000282
RAX: 5c0cc04d562dca00 RBX: ffff88814e2ad630 RCX: ffff88802cfa8ae8
RDX: dffffc0000000000 RSI: ffffffff8c2ab0c0 RDI: ffffffff8ecc27a0
RBP: ffffc9000b5a6850 R08: ffffffff9456604f R09: 1ffffffff28acc09
R10: dffffc0000000000 R11: fffffbfff28acc0a R12: ffffffff8ecc27a0
R13: ffff88804e9a1000 R14: ffff88814e2ad600 R15: ffffc9000b5a6920
FS: 00005555832db500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557a6975c8 CR3: 000000004ef5a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_lock include/linux/spinlock.h:351 [inline]
get_subdir fs/proc/proc_sysctl.c:999 [inline]
sysctl_mkdir_p fs/proc/proc_sysctl.c:1317 [inline]
__register_sysctl_table+0xcc1/0x1620 fs/proc/proc_sysctl.c:1392
neigh_sysctl_register+0x3f8/0x4e0 net/core/neighbour.c:3792
addrconf_sysctl_register+0xb2/0x1c0 net/ipv6/addrconf.c:7264
ipv6_add_dev+0xcf6/0x1220 net/ipv6/addrconf.c:456
addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3646
notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2180 [inline]
call_netdevice_notifiers net/core/dev.c:2194 [inline]
register_netdevice+0x16b5/0x1b60 net/core/dev.c:10904
veth_newlink+0x5c6/0xb00 drivers/net/veth.c:1844
rtnl_newlink_create+0x2ee/0xa40 net/core/rtnetlink.c:3801
__rtnl_newlink net/core/rtnetlink.c:3912 [inline]
rtnl_newlink+0x17cc/0x1d30 net/core/rtnetlink.c:4027
rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6917
netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
netlink_sendmsg+0x8b3/0xca0 net/netlink/af_netlink.c:1892
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:733
__sys_sendto+0x363/0x4c0 net/socket.c:2187
__do_sys_sendto net/socket.c:2194 [inline]
__se_sys_sendto net/socket.c:2190 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2190
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35d738ec7c
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffd4aea5180 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f35d80d4620 RCX: 00007f35d738ec7c
RDX: 000000000000006c RSI: 00007f35d80d4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffd4aea51d4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f35d80d4670 R15: 0000000000000000