kernel panic: corrupted stack end in dput (2)

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	kernel panic: corrupted stack end in dput fs	syz	done		1	1761d	1761d	12/26	fixed on 2019/08/27 17:15
Kernel panic - not syncing: corrupted stack end detected inside scheduler
CPU: 0 PID: 4179 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000a228>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113
[<ffffffff831668cc>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119
[<ffffffff831756ba>] __dump_stack lib/dump_stack.c:88 [inline]
[<ffffffff831756ba>] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106
[<ffffffff83175742>] dump_stack+0x1c/0x24 lib/dump_stack.c:113
[<ffffffff83166fa8>] panic+0x24a/0x634 kernel/panic.c:233
[<ffffffff831a688a>] schedule_debug kernel/sched/core.c:5541 [inline]
[<ffffffff831a688a>] schedule+0x0/0x14c kernel/sched/core.c:6187
[<ffffffff831a6c62>] preempt_schedule_notrace+0x9c/0x19a kernel/sched/core.c:6541
[<ffffffff80469e2e>] rcu_read_unlock_sched_notrace include/linux/rcupdate.h:816 [inline]
[<ffffffff80469e2e>] trace_kmalloc include/trace/events/kmem.h:46 [inline]
[<ffffffff80469e2e>] trace_kmalloc+0x76/0x120 include/trace/events/kmem.h:46
[<ffffffff8046fab8>] __kmalloc+0x184/0x318 mm/slub.c:4422
[<ffffffff806dc9b8>] kmalloc_array+0x4e/0x6e include/linux/slab.h:621
[<ffffffff806e164e>] kcalloc include/linux/slab.h:652 [inline]
[<ffffffff806e164e>] ext4_find_extent+0x690/0x77c fs/ext4/extents.c:905
[<ffffffff806e920e>] ext4_ext_map_blocks+0x1fa/0x3e86 fs/ext4/extents.c:4098
[<ffffffff8071fc44>] ext4_map_blocks+0x4fe/0xe64 fs/ext4/inode.c:638
[<ffffffff80729e24>] mpage_map_one_extent fs/ext4/inode.c:2373 [inline]
[<ffffffff80729e24>] mpage_map_and_submit_extent fs/ext4/inode.c:2426 [inline]
[<ffffffff80729e24>] ext4_writepages+0x1114/0x2206 fs/ext4/inode.c:2778
[<ffffffff80355906>] do_writepages+0x16e/0x452 mm/page-writeback.c:2364
[<ffffffff8053f7d0>] __writeback_single_inode+0xea/0x1124 fs/fs-writeback.c:1618
[<ffffffff80542eba>] writeback_single_inode+0x1ca/0x2a2 fs/fs-writeback.c:1739
[<ffffffff805430ce>] write_inode_now+0x13c/0x174 fs/fs-writeback.c:2739
[<ffffffff8050c8c6>] iput_final fs/inode.c:1731 [inline]
[<ffffffff8050c8c6>] iput fs/inode.c:1770 [inline]
[<ffffffff8050c8c6>] iput+0x558/0x61c fs/inode.c:1756
[<ffffffff804fdf52>] dentry_unlink_inode+0x200/0x2b0 fs/dcache.c:401
[<ffffffff804ff9a6>] __dentry_kill+0x21e/0x3b6 fs/dcache.c:607
[<ffffffff80501b34>] dentry_kill fs/dcache.c:733 [inline]
[<ffffffff80501b34>] dput+0x610/0x9d6 fs/dcache.c:913
[<ffffffff804cb478>] __fput+0x21c/0x502 fs/file_table.c:324
[<ffffffff804cb7d2>] ____fput+0x1a/0x24 fs/file_table.c:344
[<ffffffff800a0530>] task_work_run+0xdc/0x154 kernel/task_work.c:164
[<ffffffff80008c12>] tracehook_notify_resume include/linux/tracehook.h:188 [inline]
[<ffffffff80008c12>] do_notify_resume+0x894/0xa56 arch/riscv/kernel/signal.c:320
[<ffffffff80005724>] ret_from_exception+0x0/0x10
SMP: stopping secondary CPUs
Rebooting in 86400 seconds..