INFO: task syz-executor.5:6001 blocked for more than 143 seconds.
      Not tainted 6.0.0-next-20221017-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5  state:D stack:25568 pid:6001  ppid:3618   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5191 [inline]
 __schedule+0xae9/0x53f0 kernel/sched/core.c:6503
 schedule+0xda/0x1b0 kernel/sched/core.c:6579
 wb_wait_for_completion+0x17e/0x240 fs/fs-writeback.c:191
 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2620
 try_to_writeback_inodes_sb+0x94/0xc0 fs/fs-writeback.c:2668
 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2950
 ext4_da_write_begin+0x16c/0xb50 fs/ext4/inode.c:2977
 generic_perform_write+0x252/0x570 mm/filemap.c:3753
 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:285
 ext4_file_write_iter+0x8b8/0x16e0 fs/ext4/file.c:700
 __kernel_write_iter+0x25e/0x730 fs/read_write.c:517
 dump_emit_page fs/coredump.c:862 [inline]
 dump_user_range+0x230/0x700 fs/coredump.c:913
 elf_core_dump+0x26de/0x3510 fs/binfmt_elf.c:2311
 do_coredump+0x26d7/0x3c20 fs/coredump.c:760
 get_signal+0x1be1/0x2430 kernel/signal.c:2844
 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:309
 asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:564
RIP: 0033:0x7f79f0a8b5b1
RSP: 002b:0000000020000060 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f79f0bac050 RCX: 00007f79f0a8b5a9
RDX: 0000000020000080 RSI: 0000000020000060 RDI: 0000000000041000
RBP: 00007f79f0ae6580 R08: 0000000020000100 R09: 0000000020000100
R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffc627e6cff R14: 00007f79f1c2b300 R15: 0000000000022000
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.0.0-next-20221017-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x32f/0x3c0 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+0xc71/0xfc0 kernel/hung_task.c:377
 kthread+0x2e4/0x3a0 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: 15456 Comm: kworker/u4:24 Not tainted 6.0.0-next-20221017-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:__dev_queue_xmit+0x0/0x3b60 net/core/dev.c:4163
Code: fd ff ff e8 42 2f 6f fa e9 5a ff ff ff e8 38 2f 6f fa e9 56 fe ff ff e8 2e 2f 6f fa e9 72 fe ff ff 66 0f 1f 84 00 00 00 00 00 <41> 57 49 89 ff 41 56 4d 8d 77 10 41 55 41 54 55 53 48 bb 00 00 00
RSP: 0018:ffffc9000573fc30 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88807a174000 RCX: 0000000000000000
RDX: ffff88807d408000 RSI: 0000000000000000 RDI: ffff888078ba1280
RBP: ffff888078ba1280 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000008c07e R12: 000000000000004e
R13: ffffffff8dc2ad60 R14: 00000000aaaaaaaa R15: ffff8880798e8840
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c32bed2600 CR3: 000000000bc8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dev_queue_xmit include/linux/netdevice.h:3008 [inline]
 batadv_send_skb_packet+0x518/0x680 net/batman-adv/send.c:108
 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:393 [inline]
 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:421 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x6d7/0x910 net/batman-adv/bat_iv_ogm.c:1701
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>