INFO: task syz-executor.3:26709 blocked for more than 143 seconds.
      Not tainted 6.1.0-rc2-syzkaller-00078-g98555239e4c3 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:21304 pid:26709 ppid:21808  flags:0x00004000
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: 0033:0x0
RSP: 002b:00000000200000c8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007ff4cffabf80 RCX: 00007ff4cfe8b5a9
RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 0000000044800000
RBP: 00007ff4cfee67b0 R08: 0000000020000180 R09: 0000000020000180
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe55e5f8ff R14: 00007ff4d0bfa300 R15: 0000000000022000
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc2-syzkaller-00078-g98555239e4c3 #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: 1150 Comm: kworker/u4:5 Not tainted 6.1.0-rc2-syzkaller-00078-g98555239e4c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:check_preemption_disabled+0x37/0x120
Code: 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 1d 88 4c ba 75 65 8b 05 f1 a1 ba 75 a9 ff ff ff 7f 74 22 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 0f 85 cc 00 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5e
RSP: 0018:ffffc90004bb79e8 EFLAGS: 00000202
RAX: fb1ecbe48a406200 RBX: 0000000000000001 RCX: ffff888020e78000
RDX: 0000000000000000 RSI: ffffffff8b0abbe0 RDI: ffffffff8b0abba0
RBP: ffffc90004bb7b80 R08: dffffc0000000000 R09: fffffbfff1c4f066
R10: fffffbfff1c4f066 R11: 1ffffffff1c4f065 R12: ffff88807d299000
R13: dffffc0000000000 R14: ffff88806bde4000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd6e66bc28 CR3: 000000007f2e3000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:121 [inline]
 rcu_is_watching+0x11/0xb0 kernel/rcu/tree.c:719
 rcu_read_unlock include/linux/rcupdate.h:767 [inline]
 batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:772 [inline]
 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:826 [inline]
 batadv_iv_ogm_schedule+0x67a/0x1020 net/batman-adv/bat_iv_ogm.c:869
 batadv_iv_send_outstanding_bat_ogm_packet+0x741/0x850 net/batman-adv/bat_iv_ogm.c:1713
 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>