INFO: task syz.1.701:9227 blocked for more than 143 seconds.
Not tainted 6.15.0-next-20250527-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.701 state:D stack:26184 pid:9227 tgid:9226 ppid:5836 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5392 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6781
__schedule_loop kernel/sched/core.c:6859 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6874
netfs_wait_for_request+0x1f0/0x600 fs/netfs/misc.c:450
netfs_unbuffered_write_iter_locked+0x52a/0x910 fs/netfs/direct_write.c:110
netfs_unbuffered_write_iter+0x4c4/0x660 fs/netfs/direct_write.c:193
do_iter_readv_writev+0x515/0x6e0 fs/read_write.c:-1
vfs_writev+0x31a/0x960 fs/read_write.c:1057
do_writev+0x14d/0x2d0 fs/read_write.c:1103
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: 0033:0x7f33c3d8e969
RSP: 002b:00007f33c4beb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f33c3fb5fa0 RCX: 00007f33c3d8e969
RDX: 0000000000000002 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007f33c3e10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f33c3fb5fa0 R15: 00007ffdcd909ca8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13f080 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13f080 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13f080 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
1 lock held by udevd/5205:
2 locks held by getty/5599:
#0: ffff88814c7730a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fee2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz.1.701/9227:
#0: ffff8880315ce2b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1213
#1: ffff888028a00428 (sb_writers#26){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline]
#1: ffff888028a00428 (sb_writers#26){.+.+}-{0:0}, at: vfs_writev+0x288/0x960 fs/read_write.c:1055
#2: ffff888059f10148 (&sb->s_type->i_mutex_key#31){++++}-{4:4}, at: netfs_start_io_direct+0x1ef/0x230 fs/netfs/locking.c:188
3 locks held by kworker/0:1/9525:
#0: ffff8880b863b918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606
#1: ffff8880b8623f08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39a/0x6d0 kernel/sched/psi.c:987
#2: ffff8880b8643758 (&ACCESS_PRIVATE(sdp, lock)){....}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
#2: ffff8880b8643758 (&ACCESS_PRIVATE(sdp, lock)){....}-{3:3}, at: srcu_invoke_callbacks+0x30b/0x450 kernel/rcu/srcutree.c:1814
4 locks held by dhcpcd-run-hook/10731:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-next-20250527-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 10733 Comm: dhcpcd-run-hook Not tainted 6.15.0-next-20250527-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:page_table_check_ptes_set include/linux/page_table_check.h:76 [inline]
RIP: 0010:set_ptes include/linux/pgtable.h:292 [inline]
RIP: 0010:__copy_present_ptes mm/memory.c:971 [inline]
RIP: 0010:copy_present_ptes mm/memory.c:1054 [inline]
RIP: 0010:copy_pte_range mm/memory.c:1177 [inline]
RIP: 0010:copy_pmd_range+0x4246/0x7000 mm/memory.c:1265
Code: ff ff e8 0d b5 b3 ff e9 dd fc ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 64 df ff ff 4c 89 f7 e8 2f 30 17 00 e9 57 df ff ff 0f 1e fa e8 e1 b4 b3 ff 4c 89 f7 4c 89 fe 48 89 da b9 01 00 00
RSP: 0018:ffffc9000e5ef3c0 EFLAGS: 00000246
RAX: 1ffff1100cfe0002 RBX: 840000004eed5805 RCX: ffff88801b728000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000e5ef630 R08: ffffea00013bb547 R09: 1ffffd40002776a8
R10: dffffc0000000000 R11: fffff940002776a9 R12: dffffc0000000000
R13: ffff888067f00020 R14: ffff888030c0a040 R15: ffff888056c20428
FS: 00007f61448c8c80(0000) GS:ffff888125d55000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6144b2c7e8 CR3: 000000007aef4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
copy_pud_range mm/memory.c:1302 [inline]
copy_p4d_range mm/memory.c:1326 [inline]
copy_page_range+0xc46/0x1270 mm/memory.c:1414
dup_mmap+0xf57/0x1ac0 mm/mmap.c:1838
dup_mm kernel/fork.c:1477 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1529
copy_process+0x1706/0x3c00 kernel/fork.c:2169
kernel_clone+0x21e/0x870 kernel/fork.c:2599
__do_sys_clone kernel/fork.c:2742 [inline]
__se_sys_clone kernel/fork.c:2726 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2726
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: 0033:0x7f6144a62636
Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd387a9050 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffd387a9058 RCX: 00007f6144a62636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 000056249f0d8e60 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f61448c8f50 R11: 0000000000000246 R12: 000056249f0daf70
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000