linux-kernel - Re: [syzbot] WARNING: locking bug in hugetlb_no

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Date:   Sat, 12 Nov 2022 20:41:30 -0800
From:   syzbot <syzbot+d07c65298d2c15eafcb0@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING: locking bug in hugetlb_no_page

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: unable to handle kernel paging request in hugetlb_no_page

Unable to handle kernel paging request at virtual address 1fff800003441a18
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[1fff800003441a18] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4269 Comm: syz-executor.2 Not tainted 6.1.0-rc4-syzkaller-00039-g1621b6eaebf7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
pc : __lock_acquire+0x654/0x3084 kernel/locking/lockdep.c:5025
lr : mark_usage kernel/locking/lockdep.c:4555 [inline]
lr : __lock_acquire+0x630/0x3084 kernel/locking/lockdep.c:5009
sp : ffff8000131033d0
x29: ffff8000131034b0 x28: 0000000000000001 x27: ffff0000d2c89a68
x26: ffff0000d2c8a450 x25: ffff0000d2c8a470 x24: ffff0000d2c8a470
x23: 00000000000000c0 x22: 0000000000000001 x21: 0000000000000000
x20: ffff0000d2c89a40 x19: 555554aaabb2c422 x18: 00000000000000c0
x17: ffff80000dcdc198 x16: ffff80000db1a158 x15: ffff0000d2c89a40
x14: 0000000000000018 x13: ffff80000819fba0 x12: 00000000c73c5909
x11: ff808000095f17a4 x10: ffff80000dcdc198 x9 : 1ffffffff5765880
x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff80000801154c
x5 : 4c1501080080ffff x4 : ffff80000801154c x3 : 4c1501080080ffff
x2 : fffffffffffffff8 x1 : ffff80000cc75907 x0 : 0000000000000001
Call trace:
 generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
 __lock_acquire+0x654/0x3084 kernel/locking/lockdep.c:5025
 reacquire_held_locks+0x120/0x1c0 kernel/locking/lockdep.c:5193
 __lock_release kernel/locking/lockdep.c:5382 [inline]
 lock_release+0x148/0x2b4 kernel/locking/lockdep.c:5688
 __mutex_unlock_slowpath+0x44/0x1cc kernel/locking/mutex.c:907
 mutex_unlock+0x24/0x30 kernel/locking/mutex.c:543
 hugetlb_no_page+0x298/0xe38 mm/hugetlb.c:5772
 hugetlb_fault+0x3d0/0xe30 mm/hugetlb.c:5877
 handle_mm_fault+0x904/0xa48 mm/memory.c:5216
 __do_page_fault arch/arm64/mm/fault.c:506 [inline]
 do_page_fault+0x428/0x79c arch/arm64/mm/fault.c:606
 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:689
 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:825
 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367
 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427
 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:579
 __arch_copy_from_user+0x1bc/0x1f4 arch/arm64/lib/copy_from_user.S:214
 __import_iovec+0x60/0x248 lib/iov_iter.c:1773
 import_iovec+0x6c/0x88 lib/iov_iter.c:1838
 vfs_writev fs/read_write.c:931 [inline]
 do_writev+0xf8/0x234 fs/read_write.c:977
 __do_sys_writev fs/read_write.c:1050 [inline]
 __se_sys_writev fs/read_write.c:1047 [inline]
 __arm64_sys_writev+0x28/0x38 fs/read_write.c:1047
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Code: 350000e8 93407e69 d343fd29 927de529 (f8696949) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	350000e8 	cbnz	w8, 0x1c
   4:	93407e69 	sxtw	x9, w19
   8:	d343fd29 	lsr	x9, x9, #3
   c:	927de529 	and	x9, x9, #0x1ffffffffffffff8
* 10:	f8696949 	ldr	x9, [x10, x9] <-- trapping instruction


Tested on:

commit:         1621b6ea Merge branch 'for-next/fixes' into for-kernelci
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=12018ac1880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=606e57fd25c5c6cc
dashboard link: https://syzkaller.appspot.com/bug?extid=d07c65298d2c15eafcb0
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12eb8b71880000