INFO: task hwrng:756 blocked for more than 143 seconds.
Not tainted 6.7.0-rc4-next-20231207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:hwrng state:D stack:29504 pid:756 tgid:756 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5399 [inline]
__schedule+0xf15/0x5c80 kernel/sched/core.c:6726
__schedule_loop kernel/sched/core.c:6801 [inline]
schedule+0xe7/0x270 kernel/sched/core.c:6816
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6873
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b4/0x9c0 kernel/locking/mutex.c:752
hwrng_fillfn+0x145/0x430 drivers/char/hw_random/core.c:504
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d1ab9a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8d1ab9a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:744 [inline]
#0: ffffffff8d1ab9a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
1 lock held by hwrng/756:
#0: ffffffff8ddb4e08 (reading_mutex){+.+.}-{3:3}, at: hwrng_fillfn+0x145/0x430 drivers/char/hw_random/core.c:504
2 locks held by getty/4819:
#0: ffff88802702f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc4/0x1490 drivers/tty/n_tty.c:2201
5 locks held by kworker/u4:5/20263:
2 locks held by syz-executor.0/1757:
1 lock held by syz-executor.0/1900:
2 locks held by syz-executor.4/2518:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc4-next-20231207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x299/0x300 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+0xf86/0x1210 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1041 Comm: syz-executor.4 Not tainted 6.7.0-rc4-next-20231207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:60 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:160 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:179 [inline]
RIP: 0010:kasan_check_range+0x39/0x190 mm/kasan/generic.c:188
Code: f8 41 54 44 0f b6 c2 48 01 f0 55 53 0f 82 c6 00 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 f8 0f 83 b3 00 00 00 4c 8d 54 37 ff <48> 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 d1 48 c1 ed 03 49 c1
RSP: 0018:ffffc900035bf4c0 EFLAGS: 00000083
RAX: ffff7fffffffffff RBX: 0000000000000018 RCX: ffffffff816792ee
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9212bf40
RBP: ffffffff9216a070 R08: 0000000000000000 R09: fffffbfff24257fb
R10: ffffffff9212bf47 R11: 0000000000000007 R12: ffffed100e4318c7
R13: 0000000000000018 R14: ffff88807218c758 R15: 0000000000000002
FS: 000055555625d480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31922000 CR3: 0000000028119000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
hlock_class+0x4e/0x130 kernel/locking/lockdep.c:228
__lock_acquire+0xc5d/0x3b30 kernel/locking/lockdep.c:5134
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5719
rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
rcu_read_lock include/linux/rcupdate.h:744 [inline]
pfn_valid include/linux/mmzone.h:2030 [inline]
page_table_check_set mm/page_table_check.c:105 [inline]
__page_table_check_ptes_set+0x4b8/0xb70 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:234 [inline]
copy_present_pte mm/memory.c:991 [inline]
copy_pte_range mm/memory.c:1100 [inline]
copy_pmd_range mm/memory.c:1185 [inline]
copy_pud_range mm/memory.c:1222 [inline]
copy_p4d_range mm/memory.c:1246 [inline]
copy_page_range+0x1523/0x3c40 mm/memory.c:1344
dup_mmap kernel/fork.c:743 [inline]
dup_mm kernel/fork.c:1683 [inline]
copy_mm kernel/fork.c:1732 [inline]
copy_process+0x5c30/0x9770 kernel/fork.c:2494
kernel_clone+0xfd/0x940 kernel/fork.c:2899
__do_sys_clone+0xba/0x100 kernel/fork.c:3042
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f07ec879bd3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 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 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffccf4b4af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f07ec879bd3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055555625d750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
vkms_vblank_simulate: vblank timer overrun