INFO: task syz.4.160:7208 blocked for more than 143 seconds.
      Tainted: G        W           6.17.0-rc1-syzkaller-00214-g99bade344cfa #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.160       state:D stack:24616 pid:7208  tgid:7207  ppid:5840   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common kernel/sched/completion.c:121 [inline]
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:153
 f2fs_issue_checkpoint+0x376/0x570 fs/f2fs/checkpoint.c:-1
 f2fs_do_sync_file+0x86c/0x1860 fs/f2fs/file.c:346
 generic_write_sync include/linux/fs.h:3042 [inline]
 f2fs_file_write_iter+0x752/0x2400 fs/f2fs/file.c:5259
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5d2/0xb40 fs/read_write.c:686
 ksys_write+0x14b/0x260 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f542de5ebe9
RSP: 002b:00007f542c0c6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f542e085fa0 RCX: 00007f542de5ebe9
RDX: 0000000000000120 RSI: 000020000000c980 RDI: 0000000000000004
RBP: 00007f542dee1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f542e086038 R14: 00007f542e085fa0 R15: 00007ffe0767acc8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Tainted: G        W           6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xf93/0xfe0 kernel/hung_task.c:491
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4860 Comm: kworker/u8:12 Tainted: G        W           6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:resched_offsets_ok kernel/sched/core.c:8904 [inline]
RIP: 0010:__might_resched+0xe3/0x5d0 kernel/sched/core.c:8921
Code: 00 75 1f c6 05 35 d7 75 0d 01 48 c7 c7 c0 49 0a 8b be d7 22 00 00 48 c7 c2 40 53 0a 8b e8 85 cc 0a 00 65 44 8b 25 5d 62 64 10 <41> 81 e4 ff ff ff 7f 65 48 8b 14 25 08 b0 f5 91 4c 8d b2 44 04 00
RSP: 0018:ffffc900104af760 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92002095ef4 RCX: 2836b679b16ddb00
RDX: 0000000000000200 RSI: 0000000000000030 RDI: ffffffff8b0b0b80
RBP: ffffc900104af870 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3a787 R12: 0000000080000000
R13: dffffc0000000000 R14: ffff888033bed940 R15: ffff888033bedd84
FS:  0000000000000000(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcced0b0f8 CR3: 000000000d7a6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline]
 rt_spin_lock+0xc7/0x2c0 kernel/locking/spinlock_rt.c:57
 spin_lock_bh include/linux/spinlock_rt.h:88 [inline]
 batadv_nc_purge_paths+0x104/0x3f0 net/batman-adv/network-coding.c:442
 batadv_nc_worker+0x8c8/0xbc0 net/batman-adv/network-coding.c:722
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>