INFO: task syz-executor.4:6618 blocked for more than 143 seconds.
Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:27384 pid:6618 tgid:6615 ppid:5656 flags:0x00000006
Call Trace:
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0x1781/0x49d0 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6828
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
ppp_ioctl+0x112/0x1cd0 drivers/net/ppp/ppp_generic.c:714
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:904 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7efcf787dda9
RSP: 002b:00007efcf85590c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007efcf79abf80 RCX: 00007efcf787dda9
RDX: 0000000000000000 RSI: 0000000000007434 RDI: 0000000000000003
RBP: 00007efcf78ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007efcf79abf80 R15: 00007ffcfd5caec8
Showing all locks held in the system:
2 locks held by kworker/u8:1/11:
#0: ffff888014c81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline]
#0: ffff888014c81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335
#1: ffff8880b9428988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988
1 lock held by khungtaskd/29:
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4818:
#0: ffff88802ad2c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f0e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
2 locks held by syz-executor.3/3604:
1 lock held by syz-executor.4/6618:
#0: ffffffff8ec027a8 (ppp_mutex){+.+.}-{3:3}, at: ppp_ioctl+0x112/0x1cd0 drivers/net/ppp/ppp_generic.c:714
2 locks held by syz-executor.2/10690:
2 locks held by syz-executor.1/10692:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfb0/0xff0 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10702 Comm: syz-executor.1 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:__lock_acquire+0x1af/0x1fd0 kernel/locking/lockdep.c:5046
Code: 2b 01 00 00 85 d2 0f 84 23 01 00 00 48 8b 44 24 50 48 8d 98 d8 0a 00 00 83 fa 31 0f 83 ee 1b 00 00 48 8d 04 92 48 8d 5c c3 f8 <48> 89 dd 48 c1 ed 03 0f b6 44 35 00 84 c0 0f 85 75 16 00 00 48 83
RSP: 0000:ffffc9000b3c73b0 EFLAGS: 00000087
RAX: 0000000000000019 RBX: ffff8880a516e598 RCX: ffffffff944a6603
RDX: 0000000000000005 RSI: dffffc0000000000 RDI: 0000000000000018
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f0c1be R12: ffffffff8e131fa0
R13: 0000000000000018 R14: ffff8880a516da00 R15: 0000000000000000
FS: 00005555567a5480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f36bce5a230 CR3: 0000000012308000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 000000000000006b DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:842 [inline]
pfn_valid+0x113/0x440 include/linux/mmzone.h:2016
page_table_check_set+0x25/0x700 mm/page_table_check.c:105
__page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
set_ptes include/linux/pgtable.h:241 [inline]
set_pte_range+0x885/0x8b0 mm/memory.c:4549
filemap_map_order0_folio mm/filemap.c:3513 [inline]
filemap_map_pages+0xee2/0x1830 mm/filemap.c:3559
do_fault_around mm/memory.c:4716 [inline]
do_read_fault mm/memory.c:4749 [inline]
do_fault mm/memory.c:4888 [inline]
do_pte_missing mm/memory.c:3745 [inline]
handle_pte_fault mm/memory.c:5164 [inline]
__handle_mm_fault+0x485d/0x72d0 mm/memory.c:5305
handle_mm_fault+0x27f/0x770 mm/memory.c:5470
do_user_addr_fault arch/x86/mm/fault.c:1362 [inline]
handle_page_fault arch/x86/mm/fault.c:1505 [inline]
exc_page_fault+0x446/0x890 arch/x86/mm/fault.c:1563
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f36bce5a230
Code: Unable to access opcode bytes at 0x7f36bce5a206.
RSP: 002b:00007ffdac80ab78 EFLAGS: 00010206
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 00007f36bce7ae0d
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 00005555567a5760
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00005555567a5750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001