INFO: task syz.1.2136:6811 blocked for more than 122 seconds.
      Not tainted 6.12.38-syzkaller-g450db842cf3b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2136      state:D stack:0     pid:6811  tgid:6810  ppid:6015   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 super_lock+0x150/0x300 fs/super.c:115
 super_lock_shared fs/super.c:140 [inline]
 iterate_supers+0x8a/0x560 fs/super.c:934
 ksys_sync+0x95/0x160 fs/sync.c:103
 __ia32_sys_sync+0x12/0x20 fs/sync.c:114
 x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f587818ebe9
RSP: 002b:00007f5878f68038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f58783b5fa0 RCX: 00007f587818ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f58783b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f58783b6038 R14: 00007f58783b5fa0 R15: 00007ffcb74c3f68
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-g450db842cf3b #0 67dc9e25005870c23be976f8e40d6eb6654f4075
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xd8f/0xed0 kernel/hung_task.c:423
 kthread+0x2ca/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10458 Comm: syz.6.3357 Not tainted 6.12.38-syzkaller-g450db842cf3b #0 67dc9e25005870c23be976f8e40d6eb6654f4075
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:memcg_rstat_updated mm/memcontrol.c:591 [inline]
RIP: 0010:__mod_memcg_lruvec_state+0x2f3/0x460 mm/memcontrol.c:770
Code: 00 fc ff df 41 0f b6 04 14 84 c0 0f 85 8d 00 00 00 c7 03 00 00 00 00 44 8b 75 c8 48 83 c3 08 48 89 d8 48 c1 e8 03 80 3c 10 00 <0f> 84 e5 fe ff ff 48 89 df e8 8f 37 fb ff 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90004c6f460 EFLAGS: 00000246
RAX: 1ffff1103edce541 RBX: ffff8881f6e72a08 RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: ffffc90004c6f4a8 R08: ffffea00044fb673 R09: 1ffffd400089f6ce
R10: dffffc0000000000 R11: fffff9400089f6cf R12: 1ffff1103edce540
R13: 0000000000000035 R14: 0000000000000001 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f341eae7d60 CR3: 0000000149ff4000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __mod_lruvec_state mm/memcontrol.c:792 [inline]
 __lruvec_stat_mod_folio+0x124/0x1a0 mm/memcontrol.c:813
 __folio_mod_stat mm/rmap.c:1297 [inline]
 __folio_remove_rmap mm/rmap.c:1590 [inline]
 folio_remove_rmap_ptes+0x104/0x350 mm/rmap.c:1617
 zap_present_folio_ptes mm/memory.c:1531 [inline]
 zap_present_ptes mm/memory.c:1590 [inline]
 zap_pte_range mm/memory.c:1633 [inline]
 zap_pmd_range mm/memory.c:1763 [inline]
 zap_pud_range mm/memory.c:1792 [inline]
 zap_p4d_range mm/memory.c:1813 [inline]
 unmap_page_range+0x27c0/0x3f80 mm/memory.c:1834
 unmap_single_vma mm/memory.c:1880 [inline]
 unmap_vmas+0x2c5/0x3e0 mm/memory.c:1924
 exit_mmap+0x25b/0xb60 mm/mmap.c:1962
 __mmput+0x93/0x320 kernel/fork.c:1349
 mmput+0x55/0x170 kernel/fork.c:1372
 exit_mm kernel/exit.c:574 [inline]
 do_exit+0x918/0x2630 kernel/exit.c:940
 do_group_exit+0x22a/0x300 kernel/exit.c:1095
 get_signal+0x139d/0x14f0 kernel/signal.c:2933
 arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fc562bc14a5
Code: Unable to access opcode bytes at 0x7fc562bc147b.
RSP: 002b:00007fc56392af80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007fc562db5fa0 RCX: 00007fc562bc14a5
RDX: 00007fc56392afc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc562c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fc562db6038 R14: 00007fc562db5fa0 R15: 00007ffec4e413d8
 </TASK>