upstream test error: WARNING in do_epoll_wait

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    4f30a60a Merge tag 'close-range-v5.9' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14c5a7da900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8bdd9944dedf0f16
dashboard link: https://syzkaller.appspot.com/bug?extid=4429670d8213f5f26352
compiler:       clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4429670d8213f5f26352@xxxxxxxxxxxxxxxxxxxxxxxxx

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WARNING: CPU: 1 PID: 8728 at fs/eventpoll.c:1828 ep_poll fs/eventpoll.c:1828 [inline]
WARNING: CPU: 1 PID: 8728 at fs/eventpoll.c:1828 do_epoll_wait+0x337/0x920 fs/eventpoll.c:2333
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8728 Comm: syz-fuzzer Not tainted 5.8.0-syzkaller #0
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+0x16e/0x25d lib/dump_stack.c:118
 panic+0x20c/0x69a kernel/panic.c:231
 __warn+0x211/0x240 kernel/panic.c:600
 report_bug+0x153/0x1d0 lib/bug.c:198
 handle_bug+0x4d/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x16/0x70 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:547
RIP: 0010:ep_poll fs/eventpoll.c:1828 [inline]
RIP: 0010:do_epoll_wait+0x337/0x920 fs/eventpoll.c:2333
Code: 41 be 01 00 00 00 31 c0 48 89 44 24 20 45 31 e4 e9 7f 01 00 00 e8 59 ab c6 ff 41 bc f2 ff ff ff e9 c8 03 00 00 e8 49 ab c6 ff <0f> 0b e9 58 fe ff ff 49 bf ff ff ff ff ff ff ff 7f e9 f0 fe ff ff
RSP: 0018:ffffc90000e1fe28 EFLAGS: 00010293
RAX: ffffffff81856297 RBX: ffff888120fafa00 RCX: ffff88811e196400
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff818560d8 R09: 0000ffff88619eb7
R10: 0000ffffffffffff R11: 0000000000000000 R12: 00007ffffffff000
R13: 0000000000000080 R14: 0000000000000001 R15: 0000000000000003
 __do_sys_epoll_pwait fs/eventpoll.c:2364 [inline]
 __se_sys_epoll_pwait fs/eventpoll.c:2350 [inline]
 __x64_sys_epoll_pwait+0x92/0x150 fs/eventpoll.c:2350
 do_syscall_64+0x6a/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x469240
Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7
RSP: 002b:000000c00004b7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240
RDX: 0000000000000080 RSI: 000000c00004b840 RDI: 0000000000000003
RBP: 000000c00004be40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003
R13: 000000c00009cc00 R14: 000000c00032c180 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


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