INFO: task syz.2.844:6767 blocked for more than 445 seconds.
      Not tainted 6.13.0-rc3-syzkaller-g6f6ecce59d99 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.844       state:D stack:0     pid:6767  tgid:6764  ppid:4085   flags:0x0000000c
Call Trace:
[<ffffffff861cacc4>] context_switch kernel/sched/core.c:5369 [inline]
[<ffffffff861cacc4>] __schedule+0xdaa/0x393a kernel/sched/core.c:6756
[<ffffffff861cd918>] __schedule_loop kernel/sched/core.c:6833 [inline]
[<ffffffff861cd918>] schedule+0xc4/0x324 kernel/sched/core.c:6848
[<ffffffff861ce260>] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:6905
[<ffffffff861d74d4>] rwsem_down_read_slowpath+0x56a/0x91e kernel/locking/rwsem.c:1084
[<ffffffff861d7f26>] __down_read_common kernel/locking/rwsem.c:1248 [inline]
[<ffffffff861d7f26>] __down_read kernel/locking/rwsem.c:1261 [inline]
[<ffffffff861d7f26>] down_read+0xe4/0x45e kernel/locking/rwsem.c:1526
[<ffffffff80143c3a>] mmap_read_lock include/linux/mmap_lock.h:144 [inline]
[<ffffffff80143c3a>] exit_mm kernel/exit.c:546 [inline]
[<ffffffff80143c3a>] do_exit+0x810/0x296e kernel/exit.c:925
[<ffffffff801462f8>] do_group_exit+0xd4/0x26c kernel/exit.c:1087
[<ffffffff8017ce3a>] get_signal+0x1f4c/0x22de kernel/signal.c:3017
[<ffffffff8006b812>] arch_do_signal_or_restart+0x98a/0x1d2c arch/riscv/kernel/signal.c:437
[<ffffffff861c1e18>] exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
[<ffffffff861c1e18>] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
[<ffffffff861c1e18>] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
[<ffffffff861c1e18>] syscall_exit_to_user_mode+0x29e/0x316 kernel/entry/common.c:218
[<ffffffff861c0bde>] do_trap_ecall_u+0x86/0x216 arch/riscv/kernel/traps.c:345
[<ffffffff861e527e>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

Showing all locks held in the system:
1 lock held by kthreadd/2:
1 lock held by kworker/R-mm_pe/13:
1 lock held by khungtaskd/39:
 #0: ffffffff881d0d40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x68/0x2e6 kernel/locking/lockdep.c:6740
1 lock held by kswapd0/80:
3 locks held by kworker/u9:4/946:
1 lock held by klogd/2979:
1 lock held by dhcpcd/3023:
2 locks held by getty/3150:
 #0: ff600000731800a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ff2000000008b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xd7c/0x129a drivers/tty/n_tty.c:2211
3 locks held by syz-executor/3182:
 #0: ff6000001d0d6d18 (&vma->vm_lock->lock){++++}-{4:4}, at: vma_start_read include/linux/mm.h:716 [inline]
 #0: ff6000001d0d6d18 (&vma->vm_lock->lock){++++}-{4:4}, at: lock_vma_under_rcu+0x15a/0xa60 mm/memory.c:6278
 #1: ff6000001d7b0518 (sb_pagefaults){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1725 [inline]
 #1: ff6000001d7b0518 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs.h:1890 [inline]
 #1: ff6000001d7b0518 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1da/0x10cc fs/ext4/inode.c:6158
 #2: ff60000073198958 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xdac/0x122e fs/jbd2/transaction.c:446
2 locks held by syz-executor/4085:
1 lock held by syz-executor/4108:
3 locks held by kworker/u9:5/4761:
2 locks held by kworker/1:3/5048:
5 locks held by kworker/u10:0/5440:
2 locks held by kworker/u9:2/6112:
 #0: ff6000005cdd3a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:598 [inline]
 #0: ff6000005cdd3a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1523 [inline]
 #0: ff6000005cdd3a58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1822 [inline]
 #0: ff6000005cdd3a58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x278/0x393a kernel/sched/core.c:6680
 #1: ff6000005cdbf688 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x22c/0x71a kernel/sched/psi.c:987
4 locks held by kworker/0:2/6282:
4 locks held by kworker/0:3/6719:
3 locks held by syz.2.844/6764:
1 lock held by syz.2.844/6767:
 #0: ff60000011517390 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:144 [inline]
 #0: ff60000011517390 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm kernel/exit.c:546 [inline]
 #0: ff60000011517390 (&mm->mmap_lock){++++}-{4:4}, at: do_exit+0x810/0x296e kernel/exit.c:925

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 39 Comm: khungtaskd Not tainted 6.13.0-rc3-syzkaller-g6f6ecce59d99 #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80071bd0>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff8000325c>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff8005e1ec>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8005e1ec>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff8005e280>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff8618497c>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff86184c34>] nmi_trigger_cpumask_backtrace+0x2b6/0x458 lib/nmi_backtrace.c:62
[<ffffffff8007c976>] arch_trigger_cpumask_backtrace+0x2c/0x3e arch/riscv/kernel/smp.c:347
[<ffffffff804b8ee4>] trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
[<ffffffff804b8ee4>] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
[<ffffffff804b8ee4>] watchdog+0xcee/0x1170 kernel/hung_task.c:397
[<ffffffff801c6dd0>] kthread+0x28c/0x3a4 kernel/kthread.c:389
[<ffffffff861e5396>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:327
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5048 Comm: kworker/1:3 Not tainted 6.13.0-rc3-syzkaller-g6f6ecce59d99 #0
Hardware name: riscv-virtio,qemu (DT)
Workqueue: events free_obj_work
epc : kasan_quarantine_put+0x8a/0x1fa mm/kasan/quarantine.c:236
 ra : kasan_quarantine_put+0x198/0x1fa mm/kasan/quarantine.c:234
epc : ffffffff80a1c03c ra : ffffffff80a1c14a sp : ff20000000017b50
 gp : ffffffff899f64c0 tp : ff6000001b2eb480 t0 : ff20000000017b30
 t1 : 0000000000000009 t2 : 0000000000000000 s0 : ff20000000017b90
 s1 : 000000000006ee10 a0 : 0000000000000001 a1 : ffffffff8663f920
 a2 : 0000000000000003 a3 : 0000000000000100 a4 : 0000000000000001
 a5 : 0000000000000000 a6 : ff6000001b2ebfe8 a7 : 1fec00000365d7fd
 s2 : ff6000004ed66500 s3 : 0000000000000002 s4 : ff60000073074000
 s5 : 0000000000000000 s6 : ffffffff89b04b40 s7 : 0000000000000000
 s8 : 000003508a07929c s9 : 0000000000002710 s10: ffffffff89a34160
 s11: 1fec000009daccab t3 : ff6000001b2ebfa0 t4 : fffffffef21a90de
 t5 : fffffffef21a90df t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff80a1c03c>] arch_local_irq_restore arch/riscv/include/asm/irqflags.h:51 [inline]
[<ffffffff80a1c03c>] kasan_quarantine_put+0x8a/0x1fa mm/kasan/quarantine.c:234
[<ffffffff80a18624>] __kasan_slab_free+0x56/0x68 mm/kasan/common.c:271
[<ffffffff80980a4e>] kasan_slab_free include/linux/kasan.h:233 [inline]
[<ffffffff80980a4e>] slab_free_hook mm/slub.c:2353 [inline]
[<ffffffff80980a4e>] slab_free mm/slub.c:4613 [inline]
[<ffffffff80980a4e>] kmem_cache_free+0x20e/0x630 mm/slub.c:4715
[<ffffffff84f4d7dc>] dst_destroy+0x2aa/0x3cc net/core/dst.c:121
[<ffffffff84f4d91a>] dst_destroy_rcu+0x1c/0x2e net/core/dst.c:132
[<ffffffff803549d4>] rcu_do_batch kernel/rcu/tree.c:2567 [inline]
[<ffffffff803549d4>] rcu_core+0xa24/0x1ea0 kernel/rcu/tree.c:2823
[<ffffffff8035625e>] rcu_core_si+0xc/0x14 kernel/rcu/tree.c:2840
[<ffffffff8014ccae>] handle_softirqs+0x4b2/0x132e kernel/softirq.c:561
[<ffffffff8014ddfa>] __do_softirq kernel/softirq.c:595 [inline]
[<ffffffff8014ddfa>] invoke_softirq kernel/softirq.c:435 [inline]
[<ffffffff8014ddfa>] __irq_exit_rcu+0x18c/0x550 kernel/softirq.c:662
[<ffffffff8014f1b4>] irq_exit_rcu+0x10/0xf8 kernel/softirq.c:678
[<ffffffff861c05ac>] handle_riscv_irq+0x40/0x4c arch/riscv/kernel/traps.c:378
[<ffffffff861e53d2>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:356