INFO: task syz.3.1407:10686 blocked for more than 143 seconds.
Not tainted 6.16.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1407 state:D stack:25096 pid:10686 tgid:10686 ppid:5849 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5401 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6790
__schedule_loop kernel/sched/core.c:6868 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6883
io_schedule+0x81/0xe0 kernel/sched/core.c:7728
folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317
folio_wait_writeback+0xb0/0x100 mm/page-writeback.c:3126
__filemap_fdatawait_range+0x147/0x230 mm/filemap.c:539
filemap_fdatawait_range+0x25/0x40 mm/filemap.c:565
filemap_fdatawait include/linux/pagemap.h:50 [inline]
__writeback_single_inode+0x1dc/0xff0 fs/fs-writeback.c:1690
writeback_single_inode+0x1f3/0x6a0 fs/fs-writeback.c:1801
write_inode_now+0x158/0x1c0 fs/fs-writeback.c:2863
fuse_flush+0x266/0x800 fs/fuse/file.c:453
filp_flush+0xbd/0x190 fs/open.c:1549
filp_close+0x1d/0x40 fs/open.c:1562
__range_close fs/file.c:752 [inline]
__do_sys_close_range fs/file.c:811 [inline]
__se_sys_close_range+0x359/0x650 fs/file.c:775
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: 0033:0x7fb54c58e929
RSP: 002b:00007ffceefd4598 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fb54c7b7ba0 RCX: 00007fb54c58e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb54c7b7ba0 R08: 00000000000000b0 R09: 0000000aeefd488f
R10: 00007fb54c7b7ac0 R11: 0000000000000246 R12: 00000000000738ac
R13: 00007ffceefd4690 R14: ffffffffffffffff R15: 00007ffceefd46b0
INFO: task syz.3.1407:10691 blocked for more than 146 seconds.
Not tainted 6.16.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1407 state:D stack:25576 pid:10691 tgid:10686 ppid:5849 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5401 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6790
__schedule_loop kernel/sched/core.c:6868 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6883
io_schedule+0x81/0xe0 kernel/sched/core.c:7728
folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317
folio_wait_writeback+0xb0/0x100 mm/page-writeback.c:3126
__filemap_fdatawait_range+0x147/0x230 mm/filemap.c:539
file_write_and_wait_range+0x275/0x330 mm/filemap.c:798
fuse_fsync+0x124/0x310 fs/fuse/file.c:528
generic_write_sync include/linux/fs.h:3031 [inline]
generic_file_write_iter+0x311/0x540 mm/filemap.c:4259
fuse_cache_write_iter fs/fuse/file.c:1400 [inline]
fuse_file_write_iter+0xd98/0x10a0 fs/fuse/file.c:1741
do_iter_readv_writev+0x56e/0x7f0 fs/read_write.c:-1
vfs_writev+0x31a/0x960 fs/read_write.c:1057
do_writev+0x14d/0x2d0 fs/read_write.c:1103
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: 0033:0x7fb54c58e929
RSP: 002b:00007fb54d35f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fb54c7b6160 RCX: 00007fb54c58e929
RDX: 0000000000000001 RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007fb54c610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb54c7b6160 R15: 00007ffceefd4438
Showing all locks held in the system:
1 lock held by ksoftirqd/0/15:
1 lock held by khungtaskd/31:
#0: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
1 lock held by syslogd/5189:
#0: ffff8880b8639e18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:614
2 locks held by getty/5595:
#0: ffff88814cec50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000363b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
2 locks held by kworker/u8:36/7336:
#0: ffff888142ee2948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff888142ee2948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321
#1: ffffc90003f7fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90003f7fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321
3 locks held by syz.3.1407/10691:
#0: ffff888078ecf7b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1217
#1: ffff88804a3c8428 (sb_writers#17){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3096 [inline]
#1: ffff88804a3c8428 (sb_writers#17){.+.+}-{0:0}, at: vfs_writev+0x288/0x960 fs/read_write.c:1055
#2: ffff888058652b48 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
#2: ffff888058652b48 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: fuse_fsync+0x111/0x310 fs/fuse/file.c:521
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6175 Comm: kworker/u8:12 Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:check_preemption_disabled+0x1/0x120 lib/smp_processor_id.c:13
Code: a0 c1 e1 8b 48 c7 c6 e0 c1 e1 8b eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <41> 57 41 56 53 48 83 ec 10 65 48 8b 05 1e de 34 07 48 89 44 24 08
RSP: 0018:ffffc9000b45f8d0 EFLAGS: 00000046
RAX: 0000000080000001 RBX: 0000000000000201 RCX: a20f10ccbbcf1700
RDX: 0000000000000000 RSI: ffffffff8b89a4e0 RDI: ffffffff8be1c200
RBP: ffffc9000b45f978 R08: ffffffff8fa0bbf7 R09: 1ffffffff1f4177e
R10: dffffc0000000000 R11: fffffbfff1f4177f R12: ffffffff8b362c28
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff9200168bf1c
FS: 0000000000000000(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a2c582178 CR3: 000000002823e000 CR4: 00000000003526f0
Call Trace:
__local_bh_enable_ip+0x111/0x1c0 kernel/softirq.c:402
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_nc_purge_paths+0x318/0x3b0 net/batman-adv/network-coding.c:471
batadv_nc_worker+0x369/0x610 net/batman-adv/network-coding.c:722
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245