INFO: task syz-executor.4:5944 blocked for more than 143 seconds.
      Not tainted 6.6.0-rc1-syzkaller-00240-gf0b0d403eabb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:26048 pid:5944  ppid:5086   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6695
 schedule+0xe7/0x1b0 kernel/sched/core.c:6771
 io_schedule+0xbe/0x130 kernel/sched/core.c:9026
 folio_wait_bit_common+0x3d2/0x9b0 mm/filemap.c:1301
 folio_lock include/linux/pagemap.h:1042 [inline]
 clean_bdev_aliases+0x56b/0x610 fs/buffer.c:1725
 clean_bdev_bh_alias include/linux/buffer_head.h:219 [inline]
 __block_write_begin_int+0x8d6/0x1470 fs/buffer.c:2115
 iomap_write_begin+0x5be/0x17b0 fs/iomap/buffered-io.c:772
 iomap_write_iter fs/iomap/buffered-io.c:907 [inline]
 iomap_file_buffered_write+0x3d6/0x9a0 fs/iomap/buffered-io.c:968
 blkdev_buffered_write block/fops.c:634 [inline]
 blkdev_write_iter+0x4f5/0xc90 block/fops.c:684
 call_write_iter include/linux/fs.h:1985 [inline]
 do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735
 do_iter_write+0x17f/0x830 fs/read_write.c:860
 vfs_iter_write+0x7a/0xb0 fs/read_write.c:901
 iter_file_splice_write+0x698/0xbf0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x118/0x180 fs/splice.c:1142
 splice_direct_to_actor+0x347/0xa30 fs/splice.c:1088
 do_splice_direct+0x1af/0x280 fs/splice.c:1194
 do_sendfile+0xb88/0x1390 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7effeb87cae9
RSP: 002b:00007effec5630c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007effeb99bf80 RCX: 00007effeb87cae9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007effeb8c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0100000000000042 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007effeb99bf80 R15: 00007ffcdcc10468
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/28:
 #0: ffffffff8cba7860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6607
3 locks held by kworker/1:2/779:
2 locks held by getty/4789:
 #0: ffff88814bf6d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900020782f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc5/0x1480 drivers/tty/n_tty.c:2206
4 locks held by syz-executor.2/5071:
 #0: ffff8880b983c758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:566 [inline]
 #0: ffff8880b983c758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:551
 #1: ffff8880b9828888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:999
 #2: ffff888074653d98 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffff888074653d98 (ptlock_ptr(ptdesc)#2){+.+.}-{2:2}, at: __pte_offset_map_lock+0xf1/0x300 mm/pgtable-generic.c:373
 #3: ffffffff8cba7860 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x4/0x310 mm/page_ext.c:505
2 locks held by kworker/u4:3/21512:
 #0: ffff888012c77938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x774/0x15d0 kernel/workqueue.c:2602
 #1: ffff8880b9828888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:999
2 locks held by kworker/0:2/3712:
 #0: ffff888012c7b938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x774/0x15d0 kernel/workqueue.c:2602
 #1: ffffc9000457fd88 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a7/0x15d0 kernel/workqueue.c:2605
1 lock held by syz-executor.4/6009:
1 lock held by syz-executor.0/6171:
 #0: ffff88801eeac410 (sb_writers#3){.+.+}-{0:0}, at: __do_sys_sendfile64 fs/read_write.c:1316 [inline]
 #0: ffff88801eeac410 (sb_writers#3){.+.+}-{0:0}, at: __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 #0: ffff88801eeac410 (sb_writers#3){.+.+}-{0:0}, at: __x64_sys_sendfile64+0x155/0x220 fs/read_write.c:1308
4 locks held by udevd/6355:
2 locks held by dhcpcd/6652:
 #0: ffff88803feb8590 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #0: ffff88803feb8590 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x260 net/socket.c:658
 #1: ffffffff8cbb3138 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline]
 #1: ffffffff8cbb3138 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x69e/0x7e0 kernel/rcu/tree_exp.h:992
1 lock held by syz-executor.0/6665:
 #0: ffff88802bec2410 (sb_writers#23){.+.+}-{0:0}, at: __do_sys_sendfile64 fs/read_write.c:1316 [inline]
 #0: ffff88802bec2410 (sb_writers#23){.+.+}-{0:0}, at: __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 #0: ffff88802bec2410 (sb_writers#23){.+.+}-{0:0}, at: __x64_sys_sendfile64+0x155/0x220 fs/read_write.c:1308
2 locks held by syz-executor.0/6670:
 #0: ffff88802bec2410 (sb_writers#23){.+.+}-{0:0}, at: __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 #0: ffff88802bec2410 (sb_writers#23){.+.+}-{0:0}, at: __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 #0: ffff88802bec2410 (sb_writers#23){.+.+}-{0:0}, at: __x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308
 #1: ffff888049ef04d0 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #1: ffff888049ef04d0 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: generic_file_write_iter+0x92/0x350 mm/filemap.c:4060
2 locks held by syz-executor.3/6666:
 #0: ffffffff8cc17d88 (tracepoints_mutex){+.+.}-{3:3}, at: tracepoint_probe_register_prio_may_exist+0x9c/0x100 kernel/tracepoint.c:478
 #1: ffffffff8cbb3138 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
 #1: ffffffff8cbb3138 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x404/0x7e0 kernel/rcu/tree_exp.h:992

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.6.0-rc1-syzkaller-00240-gf0b0d403eabb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfac/0x1230 kernel/hung_task.c:379
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6662 Comm: syz-executor.0 Not tainted 6.6.0-rc1-syzkaller-00240-gf0b0d403eabb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0033:0x7fdae0a3860d
Code: 08 48 83 c3 08 48 39 d1 72 f3 48 83 e8 08 48 39 f2 73 17 66 2e 0f 1f 84 00 00 00 00 00 48 8b 70 f8 48 83 e8 08 48 39 f2 72 f3 <48> 39 c3 73 3e 48 89 33 48 83 c3 08 48 8b 70 f8 48 89 08 48 8b 0b
RSP: 002b:00007ffe4a3fd620 EFLAGS: 00000246
RAX: 00007fdae033af00 RBX: 00007fdae0339070 RCX: ffffffff813a4d64
RDX: ffffffff813a4d16 RSI: ffffffff813a4d16 RDI: 00007fdae033d088
RBP: 00007fdae0337cb8 R08: 00007fdae033a698 R09: 0000000000000e6a
R10: 0000000084233f92 R11: 00000000004b3824 R12: 00007fdae0337cb0
R13: 0000000000000017 R14: 00007fdae0b90000 R15: 00007fdae0b9c0e8
FS:  0000555556f64480 GS:  0000000000000000