INFO: task syz.7.14906:14162 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.14906 state:D stack:27600 pid:14162 tgid:14161 ppid:12994 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x16d9/0x5700 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
cgroup_lock_and_drain_offline+0x51a/0x650 kernel/cgroup/cgroup.c:3350
cgroup_kn_lock_live+0x120/0x230 kernel/cgroup/cgroup.c:1717
cgroup_subtree_control_write+0x4b5/0x1080 kernel/cgroup/cgroup.c:3652
cgroup_file_write+0x331/0x8f0 kernel/cgroup/cgroup.c:4412
kernfs_fop_write_iter+0x3a5/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x61e/0xbb0 fs/read_write.c:687
ksys_write+0x156/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbdf257e159
RSP: 002b:00007fbdf07d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbdf2805fa0 RCX: 00007fbdf257e159
RDX: 0000000000000005 RSI: 0000200000000040 RDI: 0000000000000006
RBP: 00007fbdf261506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdf2806038 R14: 00007fbdf2805fa0 R15: 00007ffdc4467ac8
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT_{RT,(lazy)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [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:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x38b/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
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: 17099 Comm: syz.0.15915 Tainted: G L syzkaller #0 PREEMPT_{RT,(lazy)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:98 [inline]
RIP: 0010:rcu_is_watching+0x9/0xb0 kernel/rcu/tree.c:752
Code: 60 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 <65> 48 ff 05 ff 49 fa 10 e8 5a 8c ac 09 89 c3 83 f8 08 73 66 49 bf
RSP: 0018:ffffc9000dc5efc0 EFLAGS: 00000297
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff99aec501
RDX: 0000000000000001 RSI: ffffffff8235ecb5 RDI: ffffffff8e1c3cc0
RBP: 0000000000000001 R08: ffffffff8fb2187f R09: 1ffffffff1f6430f
R10: dffffc0000000000 R11: fffffbfff1f64310 R12: ffff88803fbf69f0
R13: ffffffff8235ecb5 R14: ffffffff8e1c3cc0 R15: ffff88803fbf69f0
FS: 0000000000000000(0000) GS:ffff888125cc8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558e6b54f5f0 CR3: 000000000dfb0000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
trace_lock_release include/trace/events/lock.h:68 [inline]
lock_release+0x4b/0x3c0 kernel/locking/lockdep.c:5954
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
get_non_dying_memcg_end mm/memcontrol.c:876 [inline]
mod_memcg_lruvec_state+0x23a/0x270 mm/memcontrol.c:997
__update_lru_size include/linux/mm_inline.h:42 [inline]
update_lru_size include/linux/mm_inline.h:51 [inline]
lruvec_add_folio include/linux/mm_inline.h:356 [inline]
lru_activate+0xb24/0x11a0 mm/folio.c:279
folio_batch_move_lru+0x4c7/0x820 mm/folio.c:194
__folio_batch_add_and_move+0x44c/0xaa0 mm/folio.c:225
folio_mark_accessed+0x36c/0x4a0 mm/folio.c:448
zap_present_folio_ptes mm/memory.c:1788 [inline]
zap_present_ptes mm/memory.c:1861 [inline]
do_zap_pte_range mm/memory.c:1963 [inline]
zap_pte_range mm/memory.c:2065 [inline]
zap_pmd_range mm/memory.c:2151 [inline]
zap_pud_range mm/memory.c:2179 [inline]
zap_p4d_range mm/memory.c:2200 [inline]
__zap_vma_range+0x1d49/0x4a60 mm/memory.c:2240
unmap_vmas+0x390/0x550 mm/memory.c:2309
exit_mmap+0x293/0x9f0 mm/mmap.c:1315
__mmput+0xcb/0x3d0 kernel/fork.c:1193
exit_mm+0x186/0x240 kernel/exit.c:618
do_exit+0x6cd/0x2360 kernel/exit.c:1000
do_group_exit+0x22d/0x2f0 kernel/exit.c:1155
get_signal+0x121b/0x12c0 kernel/signal.c:3112
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdd86eee159
Code: Unable to access opcode bytes at 0x7fdd86eee12f.
RSP: 002b:00007fdd851040e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fdd87176188 RCX: 00007fdd86eee159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fdd87176188
RBP: 00007fdd87176180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdd87176218 R14: 00007ffe67d89cc0 R15: 00007ffe67d89da8