INFO: task syz.5.2476:7742 blocked for more than 122 seconds.
      Not tainted 6.12.30-syzkaller-g21ed84930c16 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.2476      state:D stack:0     pid:7742  tgid:7739  ppid:7161   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5947 [inline]
 __schedule+0x132b/0x1e00 kernel/sched/core.c:7775
 __schedule_loop kernel/sched/core.c:7856 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7871
 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: 0033:0x7f5f0d78e929
RSP: 002b:00007f5f0bdd6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f5f0d9b6080 RCX: 00007f5f0d78e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5f0d9b6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f5f0d9b6080 R15: 00007ffc1ac86fb8
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.30-syzkaller-g21ed84930c16 #0 fa4558fba7fa11aa57b2c84caea5bf67b39b1b5f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:229 [inline]
 watchdog+0xd8f/0xed0 kernel/hung_task.c:385
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 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: 15668 Comm: syz.6.5129 Not tainted 6.12.30-syzkaller-g21ed84930c16 #0 fa4558fba7fa11aa57b2c84caea5bf67b39b1b5f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:lru_gen_add_folio+0x2cd/0x7d0 include/linux/mm_inline.h:274
Code: ff ff c7 49 21 c6 4d 09 e6 48 89 df be 08 00 00 00 e8 b7 b5 1b 00 48 8d 7c 24 60 be 08 00 00 00 e8 a8 b5 1b 00 48 8b 44 24 60 <31> f6 f0 4c 0f b1 33 48 89 44 24 20 41 0f 94 c6 40 0f 94 c6 bf 02
RSP: 0018:ffffc90001b96980 EFLAGS: 00000056
RAX: 400000000004001c RBX: ffffea0004f4cbc0 RCX: ffffffff81bff288
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90001b969e0
RBP: ffffc90001b96a50 R08: ffffc90001b969e7 R09: 1ffff92000372d3c
R10: dffffc0000000000 R11: fffff52000372d3d R12: 1800000000000000
R13: 0000000000000002 R14: 580000000004001c R15: 0000000000000001
FS:  00007f9df69da6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d9905 CR3: 000000012be84000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 lruvec_add_folio include/linux/mm_inline.h:352 [inline]
 lru_add+0x47e/0x840 mm/swap.c:188
 folio_batch_move_lru+0x219/0x3a0 mm/swap.c:202
 __folio_batch_add_and_move+0x26c/0x370 mm/swap.c:230
 folio_add_lru+0xc8/0x170 mm/swap.c:537
 shmem_alloc_and_add_folio+0xcf6/0x1050 mm/shmem.c:1887
 shmem_get_folio_gfp+0x5f0/0x1380 mm/shmem.c:2358
 shmem_get_folio mm/shmem.c:2466 [inline]
 shmem_write_begin+0xf4/0x270 mm/shmem.c:3069
 generic_perform_write+0x330/0x960 mm/filemap.c:4127
 shmem_file_write_iter+0x105/0x130 mm/shmem.c:3243
 __kernel_write_iter+0x392/0x830 fs/read_write.c:617
 dump_emit_page fs/coredump.c:885 [inline]
 dump_user_range+0xb06/0xdf0 fs/coredump.c:946
 elf_core_dump+0x2cd9/0x3810 fs/binfmt_elf.c:2143
 do_coredump+0x1bf7/0x2bd0 fs/coredump.c:759
 get_signal+0x11fd/0x14f0 kernel/signal.c:2919
 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
 irqentry_exit+0x16/0x60 kernel/entry/common.c:334
 exc_page_fault+0x66/0xc0 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f9df5b8e931
Code: 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 <c3> 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00000000fffffd10 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f9df5db5fa0 RCX: 00007f9df5b8e929
RDX: 0000000000000000 RSI: 00000000fffffd10 RDI: 0000000001000000
RBP: 00007f9df5c10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9df5db5fa0 R15: 00007ffc76a9ed88
 </TASK>