INFO: task syz.0.1668:13714 blocked for more than 143 seconds.
Not tainted 6.17.0-rc1-next-20250814-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1668 state:D stack:25480 pid:13714 tgid:13713 ppid:5870 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
percpu_rwsem_wait+0x2e3/0x330 kernel/locking/percpu-rwsem.c:164
__percpu_down_read+0xf0/0x130 kernel/locking/percpu-rwsem.c:180
percpu_down_read_internal include/linux/percpu-rwsem.h:67 [inline]
percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
__sb_start_write include/linux/fs.h:1798 [inline]
sb_start_write+0x18e/0x1c0 include/linux/fs.h:1934
mnt_want_write+0x41/0x90 fs/namespace.c:557
filename_create+0x148/0x3c0 fs/namei.c:4132
do_mkdirat+0xa0/0x590 fs/namei.c:4391
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4414
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: 0033:0x7f38b9f8d457
RSP: 002b:00007f38baeb1e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f38baeb1ef0 RCX: 00007f38b9f8d457
RDX: 00000000000001ff RSI: 0000200000000280 RDI: 00000000ffffff9c
RBP: 00002000000002c0 R08: 00002000000007c0 R09: 0000000000000000
R10: 00002000000002c0 R11: 0000000000000246 R12: 0000200000000280
R13: 00007f38baeb1eb0 R14: 0000000000000000 R15: 0000000000000000
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.17.0-rc1-next-20250814-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 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: 16332 Comm: syz.4.2258 Not tainted 6.17.0-rc1-next-20250814-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:psi_group_change+0x135/0x1050 kernel/sched/psi.c:805
Code: 12 48 89 df e8 bc ad 87 00 48 be 00 00 00 00 00 fc ff df 4c 8b 03 83 7c 24 24 08 0f 83 d8 0a 00 00 48 8b 44 24 50 80 3c 30 00 <74> 18 4c 89 ff 4c 89 c3 e8 8e ad 87 00 49 89 d8 48 be 00 00 00 00
RSP: 0018:ffffc90000007ae8 EFLAGS: 00000046
RAX: 1ffffffff1b7c9a2 RBX: ffffffff8e000200 RCX: 0000000000000004
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffffffff8e000160
RBP: 0000000000000000 R08: ffffffff92a14f00 R09: 0000000000000001
R10: ffff888069da5a90 R11: ffffed100d3b4b55 R12: 0000009e2c9e6597
R13: 0000000000000004 R14: ffffffff8e000160 R15: ffffffff8dbe4d10
FS: 00007f2c4f6b76c0(0000) GS:ffff888125c0f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f49fb4e1000 CR3: 000000003226e000 CR4: 00000000003526f0
Call Trace:
psi_task_change+0x118/0x340 kernel/sched/psi.c:922
psi_enqueue kernel/sched/stats.h:166 [inline]
enqueue_task+0x343/0x420 kernel/sched/core.c:2092
activate_task kernel/sched/core.c:2132 [inline]
ttwu_do_activate+0x1f3/0x870 kernel/sched/core.c:3741
ttwu_queue kernel/sched/core.c:4004 [inline]
try_to_wake_up+0x721/0x12b0 kernel/sched/core.c:4328
hrtimer_wakeup+0x4e/0x60 kernel/time/hrtimer.c:1997
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449
Code: 85 32 01 00 00 e8 e1 80 1f 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 d0 80 1f 00 eb 06 e8 c9 80 1f 00 fb 48 c7 c7 80 e1 12 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 b9 35
RSP: 0018:ffffc9000d8e6e60 EFLAGS: 00000246
RAX: ffffffff81a02547 RBX: ffffffff81a02404 RCX: 0000000000080000
RDX: ffffc9000c18b000 RSI: 000000000007ffff RDI: ffffffff8e12e180
RBP: ffffc9000d8e6f70 R08: ffffffff8fa3b137 R09: 1ffffffff1f47626
R10: dffffc0000000000 R11: fffffbfff1f47627 R12: dffffc0000000000
R13: 1ffff92001b1cdd0 R14: 0000000000000200 R15: 000000000000002f
_printk+0xcf/0x120 kernel/printk/printk.c:2475
set_capacity_and_notify+0x208/0x2d0 block/genhd.c:93
loop_set_size+0x44/0xb0 drivers/block/loop.c:210
loop_configure+0xb28/0xf90 drivers/block/loop.c:1067
lo_ioctl+0x7cc/0x1d00 drivers/block/loop.c:-1
blkdev_ioctl+0x5a8/0x6d0 block/ioctl.c:705
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584
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: 0033:0x7f2c4e78e7eb
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f2c4f6b6dc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007f2c4e78e7eb
RDX: 0000000000000006 RSI: 0000000000004c00 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005e4e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 00007f2c4f6b6ef0 R14: 00007f2c4f6b6eb0 R15: 00007f2c44400000