INFO: task syz.4.270:8476 blocked for more than 143 seconds.
Tainted: G W syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.270 state:D stack:28856 pid:8476 tgid:8442 ppid:8058 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
rt_mutex[ 393.985341][ T39] __schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex[ 393.985341][ T39] rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 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
inode_lock_shared include/linux/fs.h:884 [inline]
lookup_slow+0x46/0x70 fs/namei.c:1824
walk_component fs/namei.c:2129 [inline]
link_path_walk+0x935/0xea0 fs/namei.c:2497
path_parentat fs/namei.c:2701 [inline]
__filename_parentat+0x246/0x670 fs/namei.c:2725
filename_parentat fs/namei.c:2743 [inline]
do_renameat2+0x1fa/0xa80 fs/namei.c:5196
__do_sys_rename fs/namei.c:5325 [inline]
__se_sys_rename fs/namei.c:5323 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5323
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: 0033:0x7f05e0b7ebe9
RSP: 002b:00007f05dedc5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f05e0da6090 RCX: 00007f05e0b7ebe9
RDX: 0000000000000000 RSI: 0000200000001300 RDI: 00002000000000c0
RBP: 00007f05e0c01e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f05e0da6128 R14: 00007f05e0da6090 R15: 00007fff53b493e8
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 39 Comm: khungtaskd Tainted: G W syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
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:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x70e/0x8a0 kernel/kthread.c:463
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: 11573 Comm: syz.9.557 Tainted: G W syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:kasan_check_range+0x4/0x2c0 mm/kasan/generic.c:188
Code: 8b 21 8d e8 ee 35 0a ff 90 0f 0b cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 <55> 41 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 ba 01 00 00 4c
RSP: 0018:ffffc9000546ed58 EFLAGS: 00000082
RAX: 00000000ffffffff RBX: ffffffff8d9addc0 RCX: ffffffff819caca2
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d9addc0
RBP: ffffc9000546ee10 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3a7c7 R12: ffffffff8d9addd0
R13: ffffffff8d9addc8 R14: 1ffffffff1b35bba R15: 1ffffffff1b35bb9
FS: 00007f1c0440e6c0(0000) GS:ffff8881269c4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555592ee2608 CR3: 000000003ef86000 CR4: 00000000003526f0
Call Trace:
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
do_raw_spin_lock+0x112/0x290 kernel/locking/spinlock_debug.c:116
rcu_note_context_switch+0x266/0x1140 kernel/rcu/tree_plugin.h:338
__schedule+0x30e/0x4c20 kernel/sched/core.c:6846
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7145
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7169
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
irq_work_queue+0xe0/0x140 kernel/irq_work.c:125
__kfence_alloc+0x27b/0x3b0 mm/kfence/core.c:1114
kfence_alloc include/linux/kfence.h:129 [inline]
slab_alloc_node mm/slub.c:4213 [inline]
kmem_cache_alloc_lru_noprof+0x22a/0x310 mm/slub.c:4248
xas_alloc lib/xarray.c:378 [inline]
xas_create+0x1177/0x1ba0 lib/xarray.c:685
xas_store+0x9a/0x1880 lib/xarray.c:795
shmem_add_to_page_cache+0x85a/0xbc0 mm/shmem.c:942
shmem_alloc_and_add_folio mm/shmem.c:1973 [inline]
shmem_get_folio_gfp+0x7d2/0x1a70 mm/shmem.c:2597
shmem_get_folio mm/shmem.c:2703 [inline]
shmem_write_begin+0xef/0x2a0 mm/shmem.c:3353
generic_perform_write+0x29a/0x8c0 mm/filemap.c:4175
shmem_file_write_iter+0xfb/0x120 mm/shmem.c:3528
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5d2/0xb40 fs/read_write.c:686
ksys_write+0x14b/0x260 fs/read_write.c:738
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: 0033:0x7f1c061ad69f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f1c0440ddf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f1c061ad69f
RDX: 0000000001000000 RSI: 00007f1bfbfee000 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005597
R10: 0000000000000002 R11: 0000000000000293 R12: 0000000000000005
R13: 00007f1c0440def0 R14: 00007f1c0440deb0 R15: 00007f1bfbfee000