INFO: task syz.3.1161:9240 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1161 state:D stack:29224 pid:9240 tgid:9236 ppid:5838 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rwbase_write_lock+0x3dd/0x750 kernel/locking/rwbase_rt.c:272
inode_lock include/linux/fs.h:870 [inline]
vfs_utimes+0x396/0x580 fs/utimes.c:65
do_utimes_path fs/utimes.c:99 [inline]
do_utimes+0x1bd/0x2a0 fs/utimes.c:140
__do_sys_utime fs/utimes.c:221 [inline]
__se_sys_utime fs/utimes.c:210 [inline]
__x64_sys_utime+0x13e/0x200 fs/utimes.c:210
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf44edeba9
RSP: 002b:00007faf43125038 EFLAGS: 00000246 ORIG_RAX: 0000000000000084
RAX: ffffffffffffffda RBX: 00007faf45126090 RCX: 00007faf44edeba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000000c0
RBP: 00007faf44f61e19 R08: 0000000000000000 R09: 0000000000000000
RBP: 00007faf44f61e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faf45126128 R14: 00007faf45126090 R15: 00007ffc5446a748
Showing all locks held in the system:
1 lock held by khungtaskd/39:
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5591:
#0: ffff88823bf6a8a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1410 drivers/tty/n_tty.c:2222
4 locks held by kworker/0:5/5925:
2 locks held by kworker/u8:21/8174:
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc900048d7bc0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc900048d7bc0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
5 locks held by kworker/u8:29/8185:
2 locks held by kworker/u8:50/8207:
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc90003b07bc0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc90003b07bc0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
2 locks held by syz.3.1161/9237:
#0: ffff8880359d4488 (sb_writers#16){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3108 [inline]
#0: ffff8880359d4488 (sb_writers#16){.+.+}-{0:0}, at: vfs_writev+0x28e/0x970 fs/read_write.c:1055
#1: ffff88805c651600 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: netfs_start_io_direct+0x1ef/0x230 fs/netfs/locking.c:188
2 locks held by syz.3.1161/9240:
#0: ffff8880359d4488 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88805c651600 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline]
#1: ffff88805c651600 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: vfs_utimes+0x396/0x580 fs/utimes.c:65
1 lock held by syz.2.2507/12717:
2 locks held by modprobe/12752:
6 locks held by modprobe/12754:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12717 Comm: syz.2.2507 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:track_protection mm/page_counter.c:18 [inline]
RIP: 0010:page_counter_cancel+0x9f/0x110 mm/page_counter.c:65
Code: 3c 20 00 74 08 48 89 df e8 6e 6c fd ff 48 c7 03 00 00 00 00 45 31 f6 4c 8d bb 80 00 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 <84> c0 75 55 41 80 3f 00 74 14 e8 92 30 9e ff 48 89 df 4c 89 f6 5b
RSP: 0018:ffffc90023126fc0 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff88805cc20980 RCX: 0000000000080000
RDX: ffffc9000d1a1000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100b984131 R12: dffffc0000000000
R13: ffffea0001c5c7b8 R14: 0000000000003fd9 R15: ffff88805cc20a00
FS: 00007f99daf4e6c0(0000) GS:ffff8881268bc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555575ee808 CR3: 000000006e0e8000 CR4: 00000000003526f0
DR0: 0000000000000006 DR1: 0000000000000055 DR2: 0000000000000005
DR3: 0000000000000001 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
page_counter_uncharge+0x2e/0x80 mm/page_counter.c:184
obj_cgroup_uncharge_pages mm/memcontrol.c:2777 [inline]
__memcg_kmem_uncharge_page+0xa6/0x170 mm/memcontrol.c:2867
free_pages_prepare mm/page_alloc.c:1320 [inline]
__free_frozen_pages+0x1bc/0xce0 mm/page_alloc.c:2895
vfree+0x2ad/0x470 mm/vmalloc.c:3434
nf_tables_newset+0x1f20/0x2530 net/netfilter/nf_tables_api.c:5630
nfnetlink_rcv_batch net/netfilter/nfnetlink.c:524 [inline]
nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
nfnetlink_rcv+0x1136/0x2530 net/netfilter/nfnetlink.c:665
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x843/0xa10 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:729
____sys_sendmsg+0x508/0x820 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg net/socket.c:2700 [inline]
__do_sys_sendmsg net/socket.c:2705 [inline]
__se_sys_sendmsg net/socket.c:2703 [inline]
__x64_sys_sendmsg+0x1a1/0x260 net/socket.c:2703
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f99dcceeba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f99daf4e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f99dcf35fa0 RCX: 00007f99dcceeba9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f99dcd71e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f99dcf36038 R14: 00007f99dcf35fa0 R15: 00007ffdf396a658