INFO: task syz-executor.0:25404 blocked for more than 143 seconds.
      Not tainted 6.1.0-rc1-syzkaller-00454-ga70385240892 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:23256 pid:25404 ppid:5212   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5191 [inline]
 __schedule+0x8fc/0xda0 kernel/sched/core.c:6503
 schedule+0xcb/0x190 kernel/sched/core.c:6579
 wb_wait_for_completion+0x165/0x290 fs/fs-writeback.c:191
 __writeback_inodes_sb_nr+0x2f0/0x3d0 fs/fs-writeback.c:2620
 try_to_writeback_inodes_sb+0xa5/0xd0 fs/fs-writeback.c:2668
 ext4_nonda_switch fs/ext4/inode.c:2950 [inline]
 ext4_da_write_begin+0x243/0x760 fs/ext4/inode.c:2977
 generic_perform_write+0x314/0x610 mm/filemap.c:3753
 ext4_buffered_write_iter+0x122/0x3a0 fs/ext4/file.c:285
 ext4_file_write_iter+0x1d0/0x18e0
 __kernel_write_iter+0x323/0x770 fs/read_write.c:517
 dump_emit_page+0xa79/0xca0 fs/coredump.c:857
 dump_user_range+0x5b/0xf0 fs/coredump.c:908
 elf_core_dump+0x3d5b/0x4570 fs/binfmt_elf.c:2311
 do_coredump+0x1874/0x2900 fs/coredump.c:755
 get_signal+0x147e/0x1810 kernel/signal.c:2844
 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:309
 exc_page_fault+0xa2/0x120 arch/x86/mm/fault.c:1578
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0xc7b63d09
RSP: 002b:00000000200002a8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fb5481abf80 RCX: 00007fb54808b5f9
RDX: 0000000020000180 RSI: 00000000200002a0 RDI: 00000000c0080000
RBP: 00007fb5480e67b0 R08: 0000000020000300 R09: 0000000020000300
R10: 00000000200002c0 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffdc647ce2f R14: 00007fb549157300 R15: 0000000000022000
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 6.1.0-rc1-syzkaller-00454-ga70385240892 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e3/0x560 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x19b/0x3e0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xcf5/0xd40 kernel/hung_task.c:377
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 92 Comm: kworker/u4:4 Not tainted 6.1.0-rc1-syzkaller-00454-ga70385240892 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: bat_events batadv_nc_worker
RIP: 0010:debug_lockdep_rcu_enabled+0x9/0x30 kernel/rcu/update.c:280
Code: 48 c7 c7 40 67 ad 8a 48 c7 c6 60 8b ad 8a 31 c0 e8 5c eb 08 f7 0f 0b eb cc cc cc cc cc cc cc cc cc 31 c0 83 3d e7 c6 df 03 00 <74> 1e 83 3d 62 fa df 03 00 74 15 65 48 8b 0c 25 00 6f 02 00 31 c0
RSP: 0000:ffffc900020af918 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 1ffff92000415f24 RCX: ffffffff8169259b
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e2781e8
RBP: ffffc900020af9a0 R08: dffffc0000000000 R09: fffffbfff1c4f03e
R10: fffffbfff1c4f03e R11: 1ffffffff1c4f03d R12: dffffc0000000000
R13: ffffffff8a1928cf R14: dffffc0000000000 R15: 1ffff92000415f48
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33629000 CR3: 000000000ca8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_lock_held_common kernel/rcu/update.c:104 [inline]
 rcu_read_lock_sched_held+0x5f/0x130 kernel/rcu/update.c:123
 trace_lock_release+0x95/0x220 include/trace/events/lock.h:69
 lock_release+0x81/0x870 kernel/locking/lockdep.c:5679
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:165 [inline]
 _raw_spin_unlock_bh+0x17/0x30 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:395 [inline]
 batadv_nc_purge_paths+0x35f/0x3f0 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x2da/0x5b0 net/batman-adv/network-coding.c:720
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>