INFO: task syz.1.355:6300 blocked for more than 143 seconds.
Not tainted 6.1.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.355 state:D stack:26496 pid:6300 ppid:4249 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_timeout+0xac/0x300 kernel/time/timer.c:1941
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x350/0x610 kernel/sched/completion.c:138
xfs_buf_iowait+0xd2/0x510 fs/xfs/xfs_buf.c:1611
__xfs_buf_submit+0x428/0x830 fs/xfs/xfs_buf.c:1691
xfs_buf_submit fs/xfs/xfs_buf.c:60 [inline]
xfs_buf_read_uncached+0x1f7/0x2d0 fs/xfs/xfs_buf.c:925
xfs_readsb+0x1a9/0x640 fs/xfs/xfs_mount.c:179
xfs_fs_fill_super+0x601/0x13a0 fs/xfs/xfs_super.c:1530
get_tree_bdev+0x3fe/0x620 fs/super.c:1366
vfs_get_tree+0x88/0x270 fs/super.c:1573
do_new_mount+0x2ba/0xb40 fs/namespace.c:3056
do_mount fs/namespace.c:3399 [inline]
__do_sys_mount fs/namespace.c:3607 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3584
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1100d8d169
RSP: 002b:00007f1101bc5038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1100fa6160 RCX: 00007f1100d8d169
RDX: 0000200000000040 RSI: 0000200000000000 RDI: 0000200000000280
RBP: 00007f1100e0e990 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1100fa6160 R15: 00007fff37983b48
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d32e990 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d32f190 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/27:
#0: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d32e7c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6510
2 locks held by getty/4005:
#0: ffff88814cee9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x54a/0x1620 drivers/tty/n_tty.c:2198
2 locks held by kworker/1:10/5568:
#0: ffff888017c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x806/0x1260 kernel/workqueue.c:2267
#1: ffffc90005f5fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x806/0x1260 kernel/workqueue.c:2267
1 lock held by syz.1.355/6300:
#0: ffff888075c700e0 (&type->s_umount_key#74/1){+.+.}-{3:3}, at: alloc_super+0x217/0x930 fs/super.c:228
1 lock held by syz-executor/6399:
2 locks held by syz.7.656/7814:
2 locks held by syz.7.669/7877:
3 locks held by syz.6.695/7983:
2 locks held by syz.0.700/7999:
3 locks held by syz.6.714/8065:
2 locks held by syz.0.717/8073:
#0: ffffffff8e550ea8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
#0: ffffffff8e550ea8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x1b0 drivers/net/tun.c:3492
#1: ffffffff8d333df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
#1: ffffffff8d333df8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f0/0x930 kernel/rcu/tree_exp.h:962
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.1.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1ca/0x430 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+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4337 Comm: kworker/u4:7 Not tainted 6.1.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: krdsd rds_connect_worker
RIP: 0010:__list_add include/linux/list.h:74 [inline]
RIP: 0010:list_add_tail include/linux/list.h:102 [inline]
RIP: 0010:add_to_free_list_tail mm/page_alloc.c:1016 [inline]
RIP: 0010:__free_one_page+0x622/0xd30 mm/page_alloc.c:1167
Code: 4c 89 23 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 b6 aa 0c 00 48 8b 3c 24 4c 89 77 08 <48> 83 c7 10 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80
RSP: 0018:ffffc900043776e8 EFLAGS: 00000046
RAX: 1ffffd40001efe69 RBX: ffff88813fffa858 RCX: dffffc0000000000
RDX: ffff88813fffa850 RSI: ffffea0000ea7148 RDI: ffffea0000f7f340
RBP: 1ffff11027fff50b R08: dffffc0000000000 R09: fffff940001efe77
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffea0000f7f348
R13: 0000000000000000 R14: ffff88813fffa850 R15: ffffea0000ea7148
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc87ab2d1c CR3: 000000000d08e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
free_pcppages_bulk+0x396/0x760 mm/page_alloc.c:1609
free_unref_page+0x178/0x3e0 mm/page_alloc.c:3502
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc_lru+0x10c/0x2d0 mm/slub.c:3429
alloc_inode_sb include/linux/fs.h:3245 [inline]
sock_alloc_inode+0x24/0xc0 net/socket.c:306
alloc_inode fs/inode.c:261 [inline]
new_inode_pseudo+0x61/0x1d0 fs/inode.c:1063
sock_alloc net/socket.c:631 [inline]
__sock_create+0x11f/0x930 net/socket.c:1514
rds_tcp_conn_path_connect+0x2b7/0xbb0 net/rds/tcp_connect.c:-1
rds_connect_worker+0x1d5/0x290 net/rds/threads.c:176
process_one_work+0x917/0x1260 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
vkms_vblank_simulate: vblank timer overrun