INFO: task syz.4.1878:5997 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1878      state:D stack:0     pid:5997  tgid:5996  ppid:1252   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
 quota_sync_all fs/quota/quota.c:69 [inline]
 __do_sys_quotactl fs/quota/quota.c:938 [inline]
 __se_sys_quotactl+0x308/0x7d0 fs/quota/quota.c:917
 __x64_sys_quotactl+0x9f/0xc0 fs/quota/quota.c:917
 x64_sys_call+0x2818/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:180
 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: 0033:0x7feee2d8f6c9
RSP: 002b:00007feee17e3038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007feee2fe5fa0 RCX: 00007feee2d8f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007feee2e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feee2fe6038 R14: 00007feee2fe5fa0 R15: 00007fffc8d9be38
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10760 Comm: syz.6.3436 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
RIP: 0010:test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline]
RIP: 0010:folio_test_set_dirty include/linux/page-flags.h:525 [inline]
RIP: 0010:noop_dirty_folio+0x56/0xa0 mm/page-writeback.c:2725
Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 d1 5c 1d 00 4c 8b 33 4c 89 f6 48 83 e6 10 31 ff e8 20 f4 c6 ff 49 83 e6 10 75 2d <e8> 35 ef c6 ff 48 89 df be 08 00 00 00 e8 a8 5f 1d 00 31 f6 f0 48
RSP: 0018:ffffc9000aa87018 EFLAGS: 00000246
RAX: ffffffff81bf0f70 RBX: ffffea0005227800 RCX: ffff88811f45b900
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000aa87028 R08: ffffea0005227807 R09: 1ffffd4000a44f00
R10: dffffc0000000000 R11: fffff94000a44f01 R12: dffffc0000000000
R13: 1ffffd4000a44f00 R14: 0000000000000000 R15: ffffffff8613e418
FS:  00007fe2380ec6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558bc094a8 CR3: 0000000136706000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 folio_mark_dirty+0xe7/0x110 mm/page-writeback.c:2915
 shmem_write_end+0x32e/0x410 mm/shmem.c:3101
 generic_perform_write+0x5e3/0x960 mm/filemap.c:4232
 shmem_file_write_iter+0x105/0x130 mm/shmem.c:3243
 __kernel_write_iter+0x41a/0x8e0 fs/read_write.c:617
 dump_emit_page fs/coredump.c:890 [inline]
 dump_user_range+0xb06/0xdf0 fs/coredump.c:951
 elf_core_dump+0x2ccc/0x3800 fs/binfmt_elf.c:2143
 do_coredump+0x1bfa/0x2bd0 fs/coredump.c:764
 get_signal+0x11fd/0x14f0 kernel/signal.c:2918
 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]
 irqentry_exit_to_user_mode+0x4e/0xb0 kernel/entry/common.c:231
 exc_debug_user+0xba/0xf0 arch/x86/kernel/traps.c:1198
 noist_exc_debug+0x1b/0x40 arch/x86/kernel/traps.c:1211
 asm_exc_debug+0x38/0x40 arch/x86/include/asm/idtentry.h:659
RIP: 0033:0x7fe2371c1f88
Code: 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 44 89 c7 <48> 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8 c3 0f 1f
RSP: 002b:00007fe2380ebf80 EFLAGS: 00000393
RAX: ffffffffffffffda RBX: 00007fe2373e5fa0 RCX: 00007fe2371c1f85
RDX: 00007fe2380ebfc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fe237211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000393 R12: 0000000000000000
R13: 00007fe2373e6038 R14: 00007fe2373e5fa0 R15: 00007fffed069388
 </TASK>