INFO: task syz.2.1617:14512 blocked for more than 147 seconds.
      Not tainted 6.12.0-rc2-syzkaller-00058-g75b607fab38d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1617      state:D stack:28592 pid:14512 tgid:14508 ppid:14209  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0xef5/0x5750 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6774
 schedule_timeout+0x258/0x2a0 kernel/time/timer.c:2591
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264
 coredump_wait fs/coredump.c:418 [inline]
 do_coredump+0x82f/0x4160 fs/coredump.c:575
 get_signal+0x237c/0x26d0 kernel/signal.c:2902
 arch_do_signal_or_restart+0x90/0x7e0 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+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f005af7dff9
RSP: 002b:00007f005bc920e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f005b136060 RCX: 00007f005af7dff9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f005b136064
RBP: 00007f005b136058 R08: 00007f005bcb4080 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f005b136064
R13: 0000000000000000 R14: 00007ffd29c859a0 R15: 00007ffd29c85a88
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ddb7800 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
3 locks held by kworker/1:1/51:
 #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1212/0x1b30 kernel/workqueue.c:3204
 #1: ffffc90000bb7d80 ((fqdir_free_work).work){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205
 #2: ffffffff8ddc2fc0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x700 kernel/rcu/tree.c:4562
2 locks held by getty/5002:
 #0: ffff888032b220a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
1 lock held by syz.3.991/11385:
1 lock held by syz.2.1617/14509:
2 locks held by syz.1.1994/16719:
2 locks held by syz.1.2000/16777:
2 locks held by syz.0.2013/16798:
 #0: ffffffff8faad5d0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x292/0x6b0 net/core/net_namespace.c:490
 #1: ffffffff8ddc2fc0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x700 kernel/rcu/tree.c:4562
3 locks held by syz.1.2015/16802:
2 locks held by syz.2.2019/16823:
 #0: ffffffff8fb61250 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:57 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x580/0x800 net/netlink/genetlink.c:1209
3 locks held by syz.2.2019/16824:
 #0: ffffffff8fb61250 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:57 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x580/0x800 net/netlink/genetlink.c:1209
 #2: ffff88807caab998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_genl_connect+0x433/0x1c00 drivers/block/nbd.c:2049
2 locks held by syz.3.2021/16829:
 #0: ffffffff8fb61250 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:57 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x580/0x800 net/netlink/genetlink.c:1209
2 locks held by syz.3.2021/16830:
 #0: ffffffff8fb61250 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:57 [inline]
 #1: ffffffff8fb61308 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x580/0x800 net/netlink/genetlink.c:1209

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00058-g75b607fab38d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xf0c/0x1240 kernel/hung_task.c:379
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 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: 16719 Comm: syz.1.1994 Not tainted 6.12.0-rc2-syzkaller-00058-g75b607fab38d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:memcpy_orig+0x2d/0x140 arch/x86/lib/memcpy_64.S:69
Code: 00 48 89 f8 48 83 fa 20 0f 82 86 00 00 00 40 38 fe 7c 35 48 83 ea 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 <48> 8d 76 20 4c 89 07 4c 89 4f 08 4c 89 57 10 4c 89 5f 18 48 8d 7f
RSP: 0018:ffffc9000362f150 EFLAGS: 00000206
RAX: ffff8880568c9000 RBX: ffffc9000362f568 RCX: 0000000000000000
RDX: 0000000000000aa0 RSI: ffff888087766520 RDI: ffff8880568c9520
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888000000000 R15: 0000000000001000
FS:  00007f54e32b56c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001075000 CR3: 000000007e4e2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 memcpy_from_iter lib/iov_iter.c:73 [inline]
 iterate_bvec include/linux/iov_iter.h:123 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:304 [inline]
 iterate_and_advance include/linux/iov_iter.h:328 [inline]
 __copy_from_iter lib/iov_iter.c:249 [inline]
 copy_page_from_iter_atomic lib/iov_iter.c:481 [inline]
 copy_page_from_iter_atomic+0x8db/0x1440 lib/iov_iter.c:460
 copy_folio_from_iter_atomic include/linux/uio.h:201 [inline]
 generic_perform_write+0x4a1/0x920 mm/filemap.c:4066
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3221
 __kernel_write_iter+0x318/0xa80 fs/read_write.c:616
 dump_emit_page fs/coredump.c:884 [inline]
 dump_user_range+0x389/0x8a0 fs/coredump.c:945
 elf_core_dump+0x2766/0x3840 fs/binfmt_elf.c:2121
 do_coredump+0x2c42/0x4160 fs/coredump.c:758
 get_signal+0x237c/0x26d0 kernel/signal.c:2902
 arch_do_signal_or_restart+0x90/0x7e0 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+0x13f/0x280 kernel/entry/common.c:231
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f54e257e001
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:0000000000000400 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f54e2735f80 RCX: 00007f54e257dff9
RDX: 9999999999999999 RSI: 0000000000000400 RDI: 0000000000000004
RBP: 00007f54e25f0296 R08: 00000000000000d1 R09: 0000000000000000
R10: ffffffffff600000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f54e2735f80 R15: 00007fff7d416b08
 </TASK>