INFO: task syz.5.157:7124 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc5-syzkaller-00353-gcd802e7e5f1e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.157       state:D stack:25176 pid:7124  tgid:7123  ppid:6438   task_flags:0x400140 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 percpu_rwsem_wait+0x2ab/0x300 kernel/locking/percpu-rwsem.c:162
 __percpu_down_read+0xe3/0x120 kernel/locking/percpu-rwsem.c:177
 percpu_down_read include/linux/percpu-rwsem.h:66 [inline]
 __sb_start_write include/linux/fs.h:1783 [inline]
 sb_start_write+0x185/0x1c0 include/linux/fs.h:1919
 mnt_want_write+0x41/0x90 fs/namespace.c:556
 do_unlinkat+0x135/0x560 fs/namei.c:4626
 __do_sys_unlink fs/namei.c:4689 [inline]
 __se_sys_unlink fs/namei.c:4687 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4687
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f246538e969
RSP: 002b:00007f24662af038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f24655b5fa0 RCX: 00007f246538e969
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000040
RBP: 00007f2465410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f24655b5fa0 R15: 00007ffdcbe63238
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc5-syzkaller-00353-gcd802e7e5f1e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 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:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:437
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10102 Comm: dhcpcd-run-hook Not tainted 6.15.0-rc5-syzkaller-00353-gcd802e7e5f1e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:get_mem_cgroup_from_mm+0x0/0x2a0 mm/memcontrol.c:923
Code: 38 c1 7c 85 4c 89 f7 e8 1e 96 f8 ff e9 78 ff ff ff 66 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 55 41 57 41 56 41 55 41 54 53 45 31 ff 0f 1f 44 00 00
RSP: 0000:ffffc9000a9e79c8 EFLAGS: 00000282
RAX: ffffea0001703480 RBX: ffffea0001703480 RCX: ffff888034778000
RDX: 0000000000000cc0 RSI: ffff88807cc99e00 RDI: ffff88807cc99e00
RBP: 0000000000000cc0 R08: ffffea0001703487 R09: 1ffffd40002e0690
R10: dffffc0000000000 R11: fffff940002e0691 R12: ffff888031fbe780
R13: dffffc0000000000 R14: ffffea0001703480 R15: 00007f45343f5000
FS:  0000000000000000(0000) GS:ffff8881260fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f45343f5d58 CR3: 0000000031f68000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __mem_cgroup_charge+0x15/0x80 mm/memcontrol.c:4608
 mem_cgroup_charge include/linux/memcontrol.h:642 [inline]
 folio_prealloc+0x51/0x180 mm/memory.c:1061
 wp_page_copy mm/memory.c:3478 [inline]
 do_wp_page+0x123a/0x5760 mm/memory.c:3939
 handle_pte_fault mm/memory.c:6013 [inline]
 __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140
 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309
 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f453470f418
Code: fe ff ff 0f 1f 80 00 00 00 00 48 85 f6 0f 84 af 00 00 00 41 f6 85 56 03 00 00 20 0f 85 a1 00 00 00 49 8b 45 60 48 85 c0 74 04 <48> 01 70 08 49 8b 45 58 48 85 c0 74 04 48 01 70 08 49 8b 45 68 48
RSP: 002b:00007ffcc97090c0 EFLAGS: 00010206
RAX: 00007f45343f5d50 RBX: 0000000000000030 RCX: 00007f45344016f0
RDX: 00007f45343f5e80 RSI: 00007f4534395000 RDI: 000000006fffffff
RBP: 00007ffcc9709210 R08: 0000000000000006 R09: 00000000effffef5
R10: 0000000070000029 R11: 00007ffcc97092f8 R12: 00007ffcc9708f70
R13: 00007f45344016b0 R14: 00007ffcc97092b0 R15: 00007f45343f6018
 </TASK>