INFO: task syz.4.1103:10240 blocked for more than 143 seconds.
Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1103 state:D stack:26384 pid:10240 tgid:10239 ppid:5829 task_flags:0x400140 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5377 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6764
__schedule_loop kernel/sched/core.c:6841 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6856
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6913
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
nfsd_nl_version_get_doit+0x181/0x790 fs/nfsd/nfsctl.c:1848
genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0xb1f/0xec0 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:733
____sys_sendmsg+0x53a/0x860 net/socket.c:2573
___sys_sendmsg net/socket.c:2627 [inline]
__sys_sendmsg+0x269/0x350 net/socket.c:2659
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: 0033:0x7f61ed98cde9
RSP: 002b:00007f61ee705038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f61edba5fa0 RCX: 00007f61ed98cde9
RDX: 0000000000040000 RSI: 0000400000000540 RDI: 000000000000000a
RBP: 00007f61eda0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f61edba5fa0 R15: 00007ffcae8ead18
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
3 locks held by kworker/u8:2/35:
2 locks held by getty/5582:
#0: ffff888031ef70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
3 locks held by kworker/1:3/5876:
2 locks held by kworker/u8:11/6497:
#0: ffff888146ec6148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888146ec6148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317
#1: ffffc9001bdffc60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9001bdffc60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317
4 locks held by udevd/7761:
#0: ffff88807e548e80 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb4/0xd70 fs/seq_file.c:182
#1: ffff88802a7f0888 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x53/0x3b0 fs/kernfs/file.c:154
#2: ffff88807e78ce18 (kn->active#23){.+.+}-{0:0}, at: kernfs_seq_start+0x72/0x3b0 fs/kernfs/file.c:155
#3: ffff88805b1f0190 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:1035 [inline]
#3: ffff88805b1f0190 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
2 locks held by syz.0.890/9243:
#0: ffffffff8ff26090 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8ee051e8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x12d/0x1a90 fs/nfsd/nfsctl.c:1922
2 locks held by syz.4.1103/10240:
#0: ffffffff8ff26090 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8ee051e8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_version_get_doit+0x181/0x790 fs/nfsd/nfsctl.c:1848
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac #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: 6497 Comm: kworker/u8:11 Not tainted 6.14.0-rc2-syzkaller-00281-g496659003dac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: iou_exit io_ring_exit_work
RIP: 0010:free_tail_page_prepare+0x1f/0x4b0 mm/page_alloc.c:991
Code: 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 48 89 f3 31 ed 49 bd 00 00 00 00 00 fc ff df eb 55 <48> 8d 7b 18 48 89 f8 48 c1 e8 03 42 80 3c 28 00 74 05 e8 aa a7 0e
RSP: 0018:ffffc9001bdff468 EFLAGS: 00000246
RAX: ffffea0001078000 RBX: ffffea000107b9c0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffea000107b9c0 RDI: ffffea0001078000
RBP: 0000000000000000 R08: ffffea000107b9b7 R09: 1ffffd400020f736
R10: dffffc0000000000 R11: fffff9400020f737 R12: 1ffffd400020f739
R13: dffffc0000000000 R14: ffffea0001078000 R15: ffffea000107b9c8
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92d48c2cbd CR3: 000000005fa96000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
free_pages_prepare mm/page_alloc.c:1103 [inline]
free_unref_folios+0x865/0x18a0 mm/page_alloc.c:2707
folios_put_refs+0x76c/0x860 mm/swap.c:994
release_pages+0x5c0/0x690 mm/swap.c:1034
io_free_region+0xb7/0x260 io_uring/memmap.c:101
io_rings_free io_uring/io_uring.c:2637 [inline]
io_ring_ctx_free+0x338/0x530 io_uring/io_uring.c:2725
io_ring_exit_work+0x813/0x8a0 io_uring/io_uring.c:2939
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3317
worker_thread+0x870/0xd30 kernel/workqueue.c:3398
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