INFO: task syz.1.728:8927 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.728 state:D stack:26504 pid:8927 tgid:8922 ppid:5821 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6908
__schedule_loop kernel/sched/core.c:6990 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7005
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7062
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
nfsd_nl_version_get_doit+0x17c/0xc40 fs/nfsd/nfsctl.c:1818
genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x61c/0x7a0 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:721 [inline]
__sock_sendmsg net/socket.c:736 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2585
___sys_sendmsg+0x2a5/0x360 net/socket.c:2639
__sys_sendmsg net/socket.c:2671 [inline]
__do_sys_sendmsg net/socket.c:2676 [inline]
__se_sys_sendmsg net/socket.c:2674 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2674
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8bd299c799
RSP: 002b:00007f8bd3859028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8bd2c16090 RCX: 00007f8bd299c799
RDX: 0000000000000000 RSI: 00002000000032c0 RDI: 0000000000000007
RBP: 00007f8bd2a32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8bd2c16128 R14: 00007f8bd2c16090 R15: 00007fff470e71a8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e75e420 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75e420 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75e420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5579:
#0: ffff888036de00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by syz.0.352/7409:
#0: ffffffff8fc352d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
#1: ffffffff8ea858a8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x141/0x1670 fs/nfsd/nfsctl.c:1893
2 locks held by kworker/u8:36/7531:
2 locks held by syz.1.728/8927:
#0: ffffffff8fc352d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
#1: ffffffff8ea858a8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_version_get_doit+0x17c/0xc40 fs/nfsd/nfsctl.c:1818
2 locks held by syz.5.928/9754:
#0: ffffffff8fc352d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
#1: ffffffff8ea858a8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_get_doit+0x1c0/0x790 fs/nfsd/nfsctl.c:1683
1 lock held by syz.4.2498/15754:
#0: ffff888064415c68 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:729
1 lock held by syz.4.2498/15757:
#0: ffff888064415c68 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x40/0x6b0 fs/splice.c:1287
1 lock held by syz.4.2498/15762:
#0: ffff888064415c68 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x40/0x6b0 fs/splice.c:1287
2 locks held by dhcpcd-run-hook/15851:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
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:161 [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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 15853 Comm: rm Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:memcg1_event_ratelimit mm/memcontrol-v1.c:558 [inline]
RIP: 0010:memcg1_check_events mm/memcontrol-v1.c:584 [inline]
RIP: 0010:memcg1_commit_charge+0x188/0x290 mm/memcontrol-v1.c:602
Code: 2e 52 77 09 48 b8 00 00 00 00 00 fc ff df 41 80 3c 04 00 74 08 4c 89 ff e8 c5 6c f8 ff 49 8b 07 65 48 8b 40 08 48 39 e8 79 55 <48> 83 ed 80 48 c7 c7 40 8d dc 8b e8 f8 51 77 09 48 b8 00 00 00 00
RSP: 0000:ffffc9000492fad0 EFLAGS: 00000097
RAX: 000000000001f4e2 RBX: 0000000000000001 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8bdc8d20 RDI: ffffffff8c27b500
RBP: 000000000001f4e3 R08: ffffffff901128b7 R09: 1ffffffff2022516
R10: dffffc0000000000 R11: fffffbfff2022517 R12: 1ffff110039dd4b8
R13: 0000000000000246 R14: 00fff00000000000 R15: ffff88801ceea5c0
FS: 00007effaf5e5c80(0000) GS:ffff888125567000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007effaf8858b0 CR3: 0000000069ef0000 CR4: 00000000003526f0
Call Trace:
charge_memcg mm/memcontrol.c:4750 [inline]
__mem_cgroup_charge+0x11f/0x1e0 mm/memcontrol.c:4761
mem_cgroup_charge include/linux/memcontrol.h:664 [inline]
folio_prealloc mm/memory.c:1211 [inline]
alloc_anon_folio mm/memory.c:5209 [inline]
do_anonymous_page mm/memory.c:5266 [inline]
do_pte_missing+0x1677/0x3490 mm/memory.c:4475
handle_pte_fault mm/memory.c:6317 [inline]
__handle_mm_fault mm/memory.c:6455 [inline]
handle_mm_fault+0x1bec/0x3310 mm/memory.c:6624
do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7effaf7f9a21
Code: 48 83 fa ff 48 0f 45 f8 48 8b 05 a2 54 08 00 31 d2 4c 8b 80 c8 02 00 00 48 8b 88 c0 02 00 00 48 8b 70 18 4c 01 c1 48 83 e9 01 <48> 89 35 88 be 08 00 48 89 c8 49 f7 f0 48 29 d1 48 89 f2 48 8d 84
RSP: 002b:00007fff409e8c70 EFLAGS: 00010212
RAX: 00007effaf98ea80 RBX: 0000000000000001 RCX: 00000000000011bf
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000800000
RBP: 00007fff409e8f40 R08: 0000000000000040 R09: 000000000000000e
R10: 00007fff409e8c70 R11: 0000000000000246 R12: fffffffffffffff8
R13: 0000009682699880 R14: 0000000000000000 R15: 00007effaf990310