INFO: task syz.1.1218:13770 blocked for more than 430 seconds.
      Not tainted 6.12.0-rc1-syzkaller-00010-gc05ad457ce8c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1218      state:D stack:0     pid:13770 tgid:13766 ppid:12686  flags:0x00000006
Call Trace:
[<ffffffff85fe3a74>] context_switch kernel/sched/core.c:5315 [inline]
[<ffffffff85fe3a74>] __schedule+0xd5a/0x3886 kernel/sched/core.c:6675
[<ffffffff85fe6664>] __schedule_loop kernel/sched/core.c:6752 [inline]
[<ffffffff85fe6664>] schedule+0xc4/0x324 kernel/sched/core.c:6767
[<ffffffff85fe693c>] io_schedule+0x78/0xd4 kernel/sched/core.c:7552
[<ffffffff806fac7c>] folio_wait_bit_common+0x398/0x944 mm/filemap.c:1309
[<ffffffff80705210>] __folio_lock mm/filemap.c:1647 [inline]
[<ffffffff80705210>] folio_lock include/linux/pagemap.h:1148 [inline]
[<ffffffff80705210>] folio_lock include/linux/pagemap.h:1144 [inline]
[<ffffffff80705210>] __filemap_get_folio+0x470/0x866 mm/filemap.c:1900
[<ffffffff807454d2>] truncate_inode_pages_range+0x344/0xd78 mm/truncate.c:351
[<ffffffff80745f28>] truncate_inode_pages+0x22/0x2e mm/truncate.c:423
[<ffffffff8126feca>] kill_bdev block/bdev.c:91 [inline]
[<ffffffff8126feca>] blkdev_flush_mapping+0xf8/0x28a block/bdev.c:671
[<ffffffff8127012a>] blkdev_put_whole+0xce/0xee block/bdev.c:678
[<ffffffff81273af4>] bdev_release+0x3fe/0x600 block/bdev.c:1103
[<ffffffff81274ad6>] blkdev_release+0x1a/0x26 block/fops.c:639
[<ffffffff80a2c758>] __fput+0x378/0x9e6 fs/file_table.c:431
[<ffffffff80a2ce6c>] ____fput+0x1c/0x26 fs/file_table.c:459
[<ffffffff8014fb7c>] task_work_run+0x16a/0x25e kernel/task_work.c:228
[<ffffffff8010be48>] get_signal+0x1aa/0x23b0 kernel/signal.c:2690
[<ffffffff8000bb06>] arch_do_signal_or_restart+0x8d6/0x1190 arch/riscv/kernel/signal.c:437
[<ffffffff85fdac04>] exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
[<ffffffff85fdac04>] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
[<ffffffff85fdac04>] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
[<ffffffff85fdac04>] syscall_exit_to_user_mode+0x2a6/0x31e kernel/entry/common.c:218
[<ffffffff85fd9b26>] do_trap_ecall_u+0x86/0x216 arch/riscv/kernel/traps.c:345
[<ffffffff85ffcac6>] _new_vmalloc_restore_context_a0+0xc2/0xce

Showing all locks held in the system:
1 lock held by khungtaskd/37:
 #0: ffffffff87fcc100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x68/0x2d6 kernel/locking/lockdep.c:6716
1 lock held by syslogd/2996:
2 locks held by getty/3149:
 #0: ff6000001828c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ff2000000008b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xd7c/0x129a drivers/tty/n_tty.c:2211
2 locks held by sshd/3174:
1 lock held by syz.0.1046/11829:
2 locks held by kworker/1:6/13554:
1 lock held by syz-executor/13754:
1 lock held by syz.1.1218/13770:
 #0: ff60000019d244c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x12c/0x600 block/bdev.c:1087
2 locks held by kworker/u10:5/13812:
 #0: ff60000011071148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204
 #1: ff20000006557c90 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204
3 locks held by kworker/0:5/14759:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.0-rc1-syzkaller-00010-gc05ad457ce8c #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80010a14>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
[<ffffffff85f7c3cc>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:136
[<ffffffff85fd797a>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff85fd797a>] dump_stack_lvl+0x122/0x196 lib/dump_stack.c:120
[<ffffffff85fd7a0a>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff85f3faae>] nmi_cpu_backtrace+0x39c/0x39e lib/nmi_backtrace.c:113
[<ffffffff85f3fd66>] nmi_trigger_cpumask_backtrace+0x2b6/0x456 lib/nmi_backtrace.c:62
[<ffffffff80019974>] arch_trigger_cpumask_backtrace+0x2c/0x3c arch/riscv/kernel/smp.c:347
[<ffffffff80432c3c>] trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
[<ffffffff80432c3c>] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
[<ffffffff80432c3c>] watchdog+0xcfa/0x1178 kernel/hung_task.c:379
[<ffffffff80154e14>] kthread+0x28c/0x3a6 kernel/kthread.c:389
[<ffffffff85ffcbde>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.12.0-rc1-syzkaller-00010-gc05ad457ce8c #0
Hardware name: riscv-virtio,qemu (DT)
epc : debug_check_no_obj_freed+0x0/0x4fc lib/debugobjects.c:1017
 ra : slab_free_hook mm/slub.c:2274 [inline]
 ra : slab_free mm/slub.c:4580 [inline]
 ra : kmem_cache_free+0x3f8/0x5f4 mm/slub.c:4682
epc : ffffffff814ad400 ra : ffffffff808da3ba sp : ff200000001a6ab0
 gp : ffffffff897bea80 tp : ff60000012aa0000 t0 : ff60000012aa0b20
 t1 : ffebffff0649dc9c t2 : 000000000000003c s0 : ff200000001a6b40
 s1 : ff60000012efaa00 a0 : ff600000324ee3c0 a1 : 0000000000000240
 a2 : 0000000000f00000 a3 : ff6000001d77c1c0 a4 : 1fec000002554163
 a5 : 0000000000000000 a6 : 0000000000f00000 a7 : ff600000324ee4e3
 s2 : ff1c000000c93b00 s3 : ff600000324ee3c0 s4 : ffffffff84c97202
 s5 : 0000000000012110 s6 : 0000000000000000 s7 : ffffffff898ba6c0
 s8 : ff6000003ab5af7e s9 : 0000000000000002 s10: ff6000003ab5afd0
 s11: 0000000000000000 t3 : 1fec000002554163 t4 : ffebffff0649dc9c
 t5 : ffebffff0649dc9d t6 : 1fec000002554177
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff814ad400>] debug_check_no_obj_freed+0x0/0x4fc lib/debugobjects.c:906
[<ffffffff84c97202>] skb_kfree_head net/core/skbuff.c:1084 [inline]
[<ffffffff84c97202>] skb_kfree_head net/core/skbuff.c:1081 [inline]
[<ffffffff84c97202>] skb_free_head+0x27e/0x2ec net/core/skbuff.c:1098
[<ffffffff84ca2952>] skb_release_data+0x6ec/0x86a net/core/skbuff.c:1125
[<ffffffff84cac422>] skb_release_all net/core/skbuff.c:1190 [inline]
[<ffffffff84cac422>] __kfree_skb+0x46/0x68 net/core/skbuff.c:1204
[<ffffffff853c8318>] tcp_wmem_free_skb include/net/tcp.h:306 [inline]
[<ffffffff853c8318>] tcp_rtx_queue_unlink_and_free include/net/tcp.h:2091 [inline]
[<ffffffff853c8318>] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3409 [inline]
[<ffffffff853c8318>] tcp_ack+0x1ed0/0x5c38 net/ipv4/tcp_input.c:4005
[<ffffffff853da628>] tcp_rcv_state_process+0xfd6/0x53ee net/ipv4/tcp_input.c:6771
[<ffffffff85425fd8>] tcp_v4_do_rcv+0x19c/0xbaa net/ipv4/tcp_ipv4.c:1938
[<ffffffff8542db74>] tcp_v4_rcv+0x3408/0x462e net/ipv4/tcp_ipv4.c:2350
[<ffffffff8532f57c>] ip_protocol_deliver_rcu+0xa2/0x64a net/ipv4/ip_input.c:205
[<ffffffff8532fe10>] ip_local_deliver_finish+0x2ec/0x57c net/ipv4/ip_input.c:233
[<ffffffff85330252>] NF_HOOK include/linux/netfilter.h:314 [inline]
[<ffffffff85330252>] NF_HOOK include/linux/netfilter.h:308 [inline]
[<ffffffff85330252>] ip_local_deliver+0x1b2/0x568 net/ipv4/ip_input.c:254
[<ffffffff8532ee32>] dst_input include/net/dst.h:460 [inline]
[<ffffffff8532ee32>] ip_rcv_finish+0x1b0/0x2d2 net/ipv4/ip_input.c:449
[<ffffffff853306de>] NF_HOOK include/linux/netfilter.h:314 [inline]
[<ffffffff853306de>] NF_HOOK include/linux/netfilter.h:308 [inline]
[<ffffffff853306de>] ip_rcv+0xd6/0x44e net/ipv4/ip_input.c:569
[<ffffffff84d21a54>] __netif_receive_skb_one_core+0x106/0x16e net/core/dev.c:5662
[<ffffffff84d21cd4>] __netif_receive_skb+0x2c/0x144 net/core/dev.c:5775
[<ffffffff84d22d58>] process_backlog+0x4fc/0x1cbc net/core/dev.c:6107
[<ffffffff84d2760a>] __napi_poll.constprop.0+0xaa/0x4b8 net/core/dev.c:6771
[<ffffffff84d2842a>] napi_poll net/core/dev.c:6840 [inline]
[<ffffffff84d2842a>] net_rx_action+0xa12/0xf10 net/core/dev.c:6962
[<ffffffff800e0fba>] handle_softirqs+0x4a6/0x10de kernel/softirq.c:554
[<ffffffff800e1cc0>] run_ksoftirqd kernel/softirq.c:927 [inline]
[<ffffffff800e1cc0>] run_ksoftirqd+0xce/0x144 kernel/softirq.c:919
[<ffffffff8016af16>] smpboot_thread_fn+0x654/0xb98 kernel/smpboot.c:164
[<ffffffff80154e14>] kthread+0x28c/0x3a6 kernel/kthread.c:389
[<ffffffff85ffcbde>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326