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Subjectkernel panic: corrupted stack end in wb_workfn
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Hello,

syzbot found the following crash on:

HEAD commit: 195303136f19 Merge tag 'kconfig-v4.21-2' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=176c0ebf400000
kernel config: https://syzkaller.appspot.com/x/.config?x=5e7dc790609552d7
dashboard link: https://syzkaller.appspot.com/bug?extid=ec1b7575afef85a0e5ca
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a9a84b400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17199bb3400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ec1b7575afef85a0e5ca@syzkaller.appspotmail.com

Kernel panic - not syncing: corrupted stack end detected inside scheduler
CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.20.0+ #396
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113
panic+0x2ad/0x55f kernel/panic.c:189
schedule_debug kernel/sched/core.c:3285 [inline]
__schedule+0x1ec6/0x1ed0 kernel/sched/core.c:3394
preempt_schedule_common+0x1f/0xe0 kernel/sched/core.c:3596
preempt_schedule+0x4d/0x60 kernel/sched/core.c:3622
___preempt_schedule+0x16/0x18
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
_raw_spin_unlock_irqrestore+0xbb/0xd0 kernel/locking/spinlock.c:184
spin_unlock_irqrestore include/linux/spinlock.h:384 [inline]
__remove_mapping+0x932/0x1af0 mm/vmscan.c:967
shrink_page_list+0x6610/0xc2e0 mm/vmscan.c:1461
shrink_inactive_list+0x77b/0x1c60 mm/vmscan.c:1961
shrink_list mm/vmscan.c:2273 [inline]
shrink_node_memcg+0x7a8/0x19a0 mm/vmscan.c:2538
shrink_node+0x3e1/0x17f0 mm/vmscan.c:2753
shrink_zones mm/vmscan.c:2987 [inline]
do_try_to_free_pages+0x3df/0x12a0 mm/vmscan.c:3049
try_to_free_pages+0x4d0/0xb90 mm/vmscan.c:3265
__perform_reclaim mm/page_alloc.c:3920 [inline]
__alloc_pages_direct_reclaim mm/page_alloc.c:3942 [inline]
__alloc_pages_slowpath+0xa5a/0x2db0 mm/page_alloc.c:4335
__alloc_pages_nodemask+0xa89/0xde0 mm/page_alloc.c:4549
alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2106
alloc_pages include/linux/gfp.h:509 [inline]
__page_cache_alloc+0x38c/0x5b0 mm/filemap.c:924
pagecache_get_page+0x396/0xf00 mm/filemap.c:1615
find_or_create_page include/linux/pagemap.h:322 [inline]
ext4_mb_load_buddy_gfp+0xddf/0x1e70 fs/ext4/mballoc.c:1158
ext4_mb_load_buddy fs/ext4/mballoc.c:1241 [inline]
ext4_mb_regular_allocator+0x634/0x1590 fs/ext4/mballoc.c:2190
ext4_mb_new_blocks+0x1de3/0x4840 fs/ext4/mballoc.c:4538
ext4_ext_map_blocks+0x2eef/0x6180 fs/ext4/extents.c:4404
ext4_map_blocks+0x8f7/0x1b60 fs/ext4/inode.c:636
mpage_map_one_extent fs/ext4/inode.c:2480 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2533 [inline]
ext4_writepages+0x2564/0x4170 fs/ext4/inode.c:2884
do_writepages+0x9a/0x1a0 mm/page-writeback.c:2335
__writeback_single_inode+0x20a/0x1660 fs/fs-writeback.c:1316
writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580
__writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1649
wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1758
oom_reaper: reaped process 7963 (syz-executor189), now anon-rss:0kB,
file-rss:0kB, shmem-rss:0kB
rsyslogd invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE),
order=0, oom_score_adj=0
wb_check_start_all fs/fs-writeback.c:1882 [inline]
wb_do_writeback fs/fs-writeback.c:1908 [inline]
wb_workfn+0xee9/0x1790 fs/fs-writeback.c:1942
process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
kthread+0x35a/0x440 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
CPU: 1 PID: 7840 Comm: rsyslogd Not tainted 4.20.0+ #396
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113
dump_header+0x253/0x1239 mm/oom_kill.c:451
oom_kill_process.cold.27+0x10/0x903 mm/oom_kill.c:966
out_of_memory+0x8ba/0x1480 mm/oom_kill.c:1133
__alloc_pages_may_oom mm/page_alloc.c:3666 [inline]
__alloc_pages_slowpath+0x230c/0x2db0 mm/page_alloc.c:4379
__alloc_pages_nodemask+0xa89/0xde0 mm/page_alloc.c:4549
alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2106
alloc_pages include/linux/gfp.h:509 [inline]
__page_cache_alloc+0x38c/0x5b0 mm/filemap.c:924
page_cache_read mm/filemap.c:2373 [inline]
filemap_fault+0x1595/0x25f0 mm/filemap.c:2557
ext4_filemap_fault+0x82/0xad fs/ext4/inode.c:6317
__do_fault+0x100/0x6b0 mm/memory.c:2997
do_read_fault mm/memory.c:3409 [inline]
do_fault mm/memory.c:3535 [inline]
handle_pte_fault mm/memory.c:3766 [inline]
__handle_mm_fault+0x392f/0x5630 mm/memory.c:3890
handle_mm_fault+0x54f/0xc70 mm/memory.c:3927
do_user_addr_fault arch/x86/mm/fault.c:1475 [inline]
__do_page_fault+0x5f6/0xd70 arch/x86/mm/fault.c:1541
do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1572
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143
RIP: 0033:0x7f00f990e1fd
Code: Bad RIP value.
RSP: 002b:00007f00f6eade30 EFLAGS: 00010293
RAX: 0000000000000fd2 RBX: 000000000111f170 RCX: 00007f00f990e1fd
RDX: 0000000000000fff RSI: 00007f00f86e25a0 RDI: 0000000000000004
RBP: 0000000000000000 R08: 000000000110a260 R09: 0000000000000000
R10: 74616c7567657227 R11: 0000000000000293 R12: 000000000065e420
R13: 00007f00f6eae9c0 R14: 00007f00f9f53040 R15: 0000000000000003
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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