INFO: task syz.0.1190:19588 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1190 state:D stack:26872 pid:19588 tgid:19586 ppid:17956 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x145f/0x5070 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7241
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1dfe/0x25e0 kernel/locking/rtmutex.c:1760
__rwbase_read_lock+0xbc/0x180 kernel/locking/rwbase_rt.c:114
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1466 [inline]
down_read+0x127/0x1f0 kernel/locking/rwsem.c:1539
__super_lock fs/super.c:59 [inline]
super_lock+0x2a9/0x3b0 fs/super.c:121
user_get_super+0xc8/0x120 fs/super.c:998
quotactl_block fs/quota/quota.c:890 [inline]
__do_sys_quotactl fs/quota/quota.c:955 [inline]
__se_sys_quotactl+0x4da/0x950 fs/quota/quota.c:917
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a113bf749
RSP: 002b:00007f0a0f626038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f0a11615fa0 RCX: 00007f0a113bf749
RDX: 0000000000000000 RSI: 0000200000000100 RDI: ffffffff80000800
RBP: 00007f0a11443f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000280 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0a11616038 R14: 00007f0a11615fa0 R15: 00007fffd0977758
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5562:
#0: ffff88814e8a80a0 (&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+0x44f/0x1460 drivers/tty/n_tty.c:2211
3 locks held by syz-executor/12331:
1 lock held by syz.0.1190/19588:
#0: ffff8880104180d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff8880104180d0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
7 locks held by dhcpcd-run-hook/22468:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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:160 [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+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 22468 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:const_folio_flags include/linux/page-flags.h:351 [inline]
RIP: 0010:folio_test_head include/linux/page-flags.h:844 [inline]
RIP: 0010:folio_test_large include/linux/page-flags.h:865 [inline]
RIP: 0010:folio_nr_pages include/linux/mm.h:2259 [inline]
RIP: 0010:__folio_add_file_rmap mm/rmap.c:1593 [inline]
RIP: 0010:folio_add_file_rmap_ptes+0x49c/0x8c0 mm/rmap.c:1611
Code: 00 44 29 f6 4c 89 ff 44 89 ea e8 df b3 15 00 eb 05 e8 88 3d b0 ff 48 8b 44 24 30 42 80 3c 20 00 74 08 48 89 ef e8 e4 73 12 00 <4c> 8b 75 00 4c 89 f6 48 83 e6 01 31 ff e8 c2 42 b0 ff 49 83 e6 01
RSP: 0000:ffffc9001cb278b8 EFLAGS: 00000246
RAX: 1ffffd40005c4aa1 RBX: 1ffffd40005c4aa0 RCX: ffff88802b531e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffea0002e25508 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff940005c4aa7 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffea0002e25530 R15: ffffea0002e25500
FS: 00007f8c1d1e8c80(0000) GS:ffff888126def000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c1d43d286 CR3: 0000000075a8a000 CR4: 00000000003526f0
Call Trace:
set_pte_range+0x52e/0x8a0 mm/memory.c:5481
filemap_map_order0_folio mm/filemap.c:3856 [inline]
filemap_map_pages+0xd00/0x1cc0 mm/filemap.c:3921
do_fault_around mm/memory.c:5713 [inline]
do_read_fault mm/memory.c:5746 [inline]
do_fault mm/memory.c:5889 [inline]
do_pte_missing+0x175b/0x27a0 mm/memory.c:4401
handle_pte_fault mm/memory.c:6273 [inline]
__handle_mm_fault mm/memory.c:6411 [inline]
handle_mm_fault+0xcc1/0x1330 mm/memory.c:6580
do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f8c1d41eddc
Code: f0 66 0f ef c0 48 83 e0 f0 66 0f 6f 08 66 0f 74 c1 66 0f d7 c0 d3 f8 85 c0 0f 84 6f ff ff ff 89 c9 48 8d 35 a6 e4 01 00 89 fa 0f 6f 04 0e 66 0f 38 00 c8 83 e2 0f 75 85 48 89 f8 eb 08 85 f6
RSP: 002b:00007ffc2e007888 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 00007ffc2e00adc8 RCX: 0000000000000006
RDX: 000000002e00adc8 RSI: 00007f8c1d43d280 RDI: 00007ffc2e00adc8
RBP: 00007ffc2e0078f8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc2e00adc8 R14: 00007f8c1d531886 R15: 0000000000000000