INFO: task syz-executor.1:5523 blocked for more than 143 seconds.
      Not tainted 5.15.156-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:    0 pid: 5523 ppid:  4664 flags:0x0000000d
Call trace:
 __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0xf10/0x1e48 kernel/sched/core.c:6376
 schedule+0x11c/0x1c8 kernel/sched/core.c:6459
 wb_wait_for_completion+0x160/0x2b4 fs/fs-writeback.c:191
 __writeback_inodes_sb_nr+0x244/0x2d8 fs/fs-writeback.c:2684
 try_to_writeback_inodes_sb+0xa0/0xc4 fs/fs-writeback.c:2732
 ext4_nonda_switch fs/ext4/inode.c:2933 [inline]
 ext4_da_write_begin+0x1b4/0x8e8 fs/ext4/inode.c:2960
 generic_perform_write+0x24c/0x520 mm/filemap.c:3785
 ext4_buffered_write_iter+0x3fc/0x528 fs/ext4/file.c:268
 ext4_file_write_iter+0x688/0x162c
 __kernel_write+0x488/0x8b0 fs/read_write.c:539
 __dump_emit+0x200/0x338 fs/coredump.c:875
 dump_emit+0x288/0x36c fs/coredump.c:912
 dump_user_range+0xd0/0x35c fs/coredump.c:949
 elf_core_dump+0x2ef4/0x3640 fs/binfmt_elf.c:2285
 do_coredump+0x12c8/0x2890 fs/coredump.c:826
 get_signal+0x3dc/0x1550 kernel/signal.c:2875
 do_signal arch/arm64/kernel/signal.c:890 [inline]
 do_notify_resume+0x320/0x32b8 arch/arm64/kernel/signal.c:943
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
 el0_da+0x118/0x20c arch/arm64/kernel/entry-common.c:495
 el0t_64_sync_handler+0xc0/0xe4 arch/arm64/kernel/entry-common.c:629
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Showing all locks held in the system:
2 locks held by kworker/1:1/25:
 #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: ffff800018a77c00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
1 lock held by khungtaskd/27:
 #0: ffff800014b114e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311
4 locks held by kworker/u4:5/617:
 #0: ffff0000c21c8138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: ffff80001dc47c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
 #2: ffff0000d48b2bd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x190/0x36fc fs/ext4/inode.c:2677
 #3: ffff0000d48b6990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xf98/0x12a4 fs/jbd2/transaction.c:462
2 locks held by getty/3721:
 #0: ffff0000d3375098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: ffff80001a33e2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158
4 locks held by kworker/u4:8/4476:
 #0: ffff0000c038c138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283
 #1: ffff80001e6e7c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285
 #2: ffff800016a2aad0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf4/0x9bc net/core/net_namespace.c:558
 #3: ffff0000cd7093e8 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_destruct+0x11c/0x2dc drivers/net/wireguard/device.c:233
3 locks held by syz-executor.1/5523:
 #0: ffff0000d48b0460 (sb_writers#3){.+.+}-{0:0}, at: do_coredump+0x12a4/0x2890 fs/coredump.c:825
 #1: ffff00010b12e7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline]
 #1: ffff00010b12e7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0x9c/0x528 fs/ext4/file.c:262
 #2: ffff0000d48b00e0 (&type->s_umount_key#30){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x2c/0xc4 fs/fs-writeback.c:2729
2 locks held by syz-executor.4/5658:
1 lock held by syz-executor.2/5872:
2 locks held by syz-executor.2/5887:
3 locks held by syz-executor.2/5900:
3 locks held by syz-executor.2/5914:
3 locks held by syz-executor.3/6941:
4 locks held by syz-executor.1/6949:
3 locks held by syz-executor.4/6953:
2 locks held by syz-executor.0/6958:
2 locks held by syz-executor.3/6960:
2 locks held by syz-executor.2/6963:
2 locks held by syz-executor.1/6968:
2 locks held by syz-executor.0/6973:
3 locks held by syz-executor.4/6976:
3 locks held by syz-executor.0/6983:
2 locks held by syz-executor.1/6986:
3 locks held by syz-executor.2/6992:
3 locks held by syz-executor.3/6995:
3 locks held by syz-executor.1/7000:
2 locks held by syz-executor.4/7003:
3 locks held by syz-executor.0/7005:
3 locks held by syz-executor.2/7015:
3 locks held by syz-executor.1/7020:
2 locks held by syz-executor.0/7022:
2 locks held by syz-executor.4/7023:
2 locks held by syz-executor.3/7027:
3 locks held by syz-executor.2/7036:
2 locks held by syz-executor.0/7038:
3 locks held by syz-executor.1/7058:
2 locks held by syz-executor.2/7060:
2 locks held by syz-executor.4/7069:
3 locks held by syz-executor.1/7074:
2 locks held by syz-executor.3/7088:
2 locks held by syz-executor.1/7099:
3 locks held by syz-executor.2/7101:
2 locks held by syz-executor.3/7103:
2 locks held by syz-executor.0/7105:
2 locks held by syz-executor.1/7112:
1 lock held by syz-executor.4/7118:
3 locks held by syz-executor.0/7120:
2 locks held by syz-executor.1/7121:
2 locks held by syz-executor.2/7122:

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