syzbot

INFO: task syz-executor:5782 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:23224 pid:5782  tgid:5782  ppid:1      task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7322
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7379
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821
 lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441
 jfs_umount+0x2da/0x3b0 fs/jfs/jfs_umount.c:124
 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
 generic_shutdown_super+0x13d/0x2d0 fs/super.c:647
 kill_block_super+0x44/0x90 fs/super.c:1665
 deactivate_locked_super+0xbc/0x130 fs/super.c:477
 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x1fa/0x730 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:318 [inline]
 do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f902939e097
RSP: 002b:00007ffcedbfe178 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f90294321ca RCX: 00007f902939e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcedbfe230
RBP: 00007ffcedbfe230 R08: 00007ffcedbff230 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcedbff2c0
R13: 00007f90294321ca R14: 000000000004719c R15: 00007ffcedbff300
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [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+0x388/0x470 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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10197 Comm: syz.2.1257 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__kernel_text_address+0x28/0x30 kernel/extable.c:92
Code: 90 90 0f 1f 40 d6 53 48 89 fb e8 33 00 00 00 48 81 fb 00 90 9b 91 0f 93 c1 48 81 fb 50 ca b3 91 0f 92 c2 20 ca 08 c2 0f b6 c2 <5b> e9 6d cf 80 ff cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0000:ffffc90003b17378 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff82187d06 RCX: 0000000080000000
RDX: ffffc90003b17301 RSI: ffffffff8c292480 RDI: ffffffff82187d06
RBP: ffffc90003b17430 R08: ffffc90003b17c10 R09: ffffc90003b173f8
R10: dffffc0000000000 R11: fffff52000762e81 R12: ffff888044ca5d00
R13: 1ffff11008994c5f R14: dffffc0000000000 R15: 1ffff92000762e7e
FS:  00007fa512a3e6c0(0000) GS:ffff88812528f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa509bb4000 CR3: 000000002bb00000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:165
 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:341
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1853
 prep_new_page mm/page_alloc.c:1861 [inline]
 get_page_from_freelist+0x24ae/0x2530 mm/page_alloc.c:3941
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221
 alloc_pages_mpol+0x212/0x380 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x39/0x160 mm/mempolicy.c:2509
 vma_alloc_folio_noprof+0xe1/0x1e0 mm/mempolicy.c:2544
 folio_prealloc mm/memory.c:-1 [inline]
 alloc_anon_folio mm/memory.c:5298 [inline]
 do_anonymous_page mm/memory.c:5392 [inline]
 do_pte_missing+0x1750/0x3540 mm/memory.c:4564
 handle_pte_fault mm/memory.c:6427 [inline]
 __handle_mm_fault mm/memory.c:6565 [inline]
 handle_mm_fault+0x1b36/0x3080 mm/memory.c:6734
 do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1339
 handle_page_fault arch/x86/mm/fault.c:1479 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7fa511a54123
Code: 1f 84 00 00 00 00 00 3d 00 01 00 00 75 29 45 31 f6 48 83 c4 18 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 40 00 49 8b 0f <44> 88 34 01 49 83 47 10 01 eb 92 66 90 8d 90 ff fe ff ff 83 fa 1c
RSP: 002b:00007fa512a3d470 EFLAGS: 00010206
RAX: 0000000000fb4000 RBX: 00007fa512a3d530 RCX: 00007fa508c00000
RDX: 00007fa512a3d6d0 RSI: 0000000000000001 RDI: 00007fa512a3d5d0
RBP: 0000000000000008 R08: 000000000000000b R09: 000000000000072a
R10: 0000000000000772 R11: 00007fa512a3d530 R12: 0000000000000c01
R13: 00007fa511c52980 R14: 00000000000000b1 R15: 00007fa512a3d5d0
 </TASK>