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Date:   Sat, 07 Mar 2020 13:05:10 -0800
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Subject: linux-next test error: BUG: using __this_cpu_read() in preemptible
 code in __mod_memcg_state
From:   syzbot <syzbot+826543256ed3b8c37f62@syzkaller.appspotmail.com>
To:     akpm@linux-foundation.org, cgroups@vger.kernel.org,
        hannes@cmpxchg.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, mhocko@kernel.org,
        syzkaller-bugs@googlegroups.com, vdavydov.dev@gmail.com
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Sender: linux-kernel-owner@vger.kernel.org
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Hello,

syzbot found the following crash on:

HEAD commit:    b86a6a24 Add linux-next specific files for 20200306
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1766b731e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9c79dccc623ccc6f
dashboard link: https://syzkaller.appspot.com/bug?extid=826543256ed3b8c37f62
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+826543256ed3b8c37f62@syzkaller.appspotmail.com

check_preemption_disabled: 3 callbacks suppressed
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-fuzzer/9432
caller is __mod_memcg_state+0x27/0x1a0 mm/memcontrol.c:689
CPU: 1 PID: 9432 Comm: syz-fuzzer Not tainted 5.6.0-rc4-next-20200306-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+0x188/0x20d lib/dump_stack.c:118
 check_preemption_disabled lib/smp_processor_id.c:47 [inline]
 __this_cpu_preempt_check.cold+0x84/0x90 lib/smp_processor_id.c:64
 __mod_memcg_state+0x27/0x1a0 mm/memcontrol.c:689
 __split_huge_page mm/huge_memory.c:2575 [inline]
 split_huge_page_to_list+0x124b/0x3380 mm/huge_memory.c:2862
 split_huge_page include/linux/huge_mm.h:167 [inline]
 madvise_free_huge_pmd+0x873/0xb90 mm/huge_memory.c:1766
 madvise_free_pte_range+0x6ff/0x2650 mm/madvise.c:584
 walk_pmd_range mm/pagewalk.c:89 [inline]
 walk_pud_range mm/pagewalk.c:160 [inline]
 walk_p4d_range mm/pagewalk.c:193 [inline]
 walk_pgd_range mm/pagewalk.c:229 [inline]
 __walk_page_range+0xcfb/0x2070 mm/pagewalk.c:331
 walk_page_range+0x1bd/0x3a0 mm/pagewalk.c:427
 madvise_free_single_vma+0x384/0x550 mm/madvise.c:731
 madvise_dontneed_free mm/madvise.c:819 [inline]
 madvise_vma mm/madvise.c:958 [inline]
 do_madvise mm/madvise.c:1161 [inline]
 do_madvise+0x5ba/0x1b80 mm/madvise.c:1084
 __do_sys_madvise mm/madvise.c:1189 [inline]
 __se_sys_madvise mm/madvise.c:1187 [inline]
 __x64_sys_madvise+0xae/0x120 mm/madvise.c:1187
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460bf7
Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14
RSP: 002b:00007ffd6e086670 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000000460bf7
RDX: 0000000000000008 RSI: 000000000000a000 RDI: 000000c00029a000
RBP: 00007ffd6e0866b0 R08: 000000c000200000 R09: 000000c0002a4000
R10: 00007fffffffffff R11: 0000000000000246 R12: 0000000000000007
R13: 00007f30cae546d0 R14: 0000000000000080 R15: 00000000000000fa
BUG: using __this_cpu_add() in preemptible [00000000] code: syz-fuzzer/9432
caller is __mod_memcg_state+0xca/0x1a0 mm/memcontrol.c:697
CPU: 1 PID: 9432 Comm: syz-fuzzer Not tainted 5.6.0-rc4-next-20200306-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+0x188/0x20d lib/dump_stack.c:118
 check_preemption_disabled lib/smp_processor_id.c:47 [inline]
 __this_cpu_preempt_check.cold+0x84/0x90 lib/smp_processor_id.c:64
 __mod_memcg_state+0xca/0x1a0 mm/memcontrol.c:697
 __split_huge_page mm/huge_memory.c:2575 [inline]
 split_huge_page_to_list+0x124b/0x3380 mm/huge_memory.c:2862
 split_huge_page include/linux/huge_mm.h:167 [inline]
 madvise_free_huge_pmd+0x873/0xb90 mm/huge_memory.c:1766
 madvise_free_pte_range+0x6ff/0x2650 mm/madvise.c:584
 walk_pmd_range mm/pagewalk.c:89 [inline]
 walk_pud_range mm/pagewalk.c:160 [inline]
 walk_p4d_range mm/pagewalk.c:193 [inline]
 walk_pgd_range mm/pagewalk.c:229 [inline]
 __walk_page_range+0xcfb/0x2070 mm/pagewalk.c:331
 walk_page_range+0x1bd/0x3a0 mm/pagewalk.c:427
 madvise_free_single_vma+0x384/0x550 mm/madvise.c:731
 madvise_dontneed_free mm/madvise.c:819 [inline]
 madvise_vma mm/madvise.c:958 [inline]
 do_madvise mm/madvise.c:1161 [inline]
 do_madvise+0x5ba/0x1b80 mm/madvise.c:1084
 __do_sys_madvise mm/madvise.c:1189 [inline]
 __se_sys_madvise mm/madvise.c:1187 [inline]
 __x64_sys_madvise+0xae/0x120 mm/madvise.c:1187
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460bf7
Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14
RSP: 002b:00007ffd6e086670 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000000460bf7
RDX: 0000000000000008 RSI: 000000000000a000 RDI: 000000c00029a000
RBP: 00007ffd6e0866b0 R08: 000000c000200000 R09: 000000c0002a4000
R10: 00007fffffffffff R11: 0000000000000246 R12: 0000000000000007
R13: 00007f30cae546d0 R14: 0000000000000080 R15: 00000000000000fa
BUG: using __this_cpu_write() in preemptible [00000000] code: syz-fuzzer/9432
caller is __mod_memcg_state+0x87/0x1a0 mm/memcontrol.c:702
CPU: 1 PID: 9432 Comm: syz-fuzzer Not tainted 5.6.0-rc4-next-20200306-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+0x188/0x20d lib/dump_stack.c:118
 check_preemption_disabled lib/smp_processor_id.c:47 [inline]
 __this_cpu_preempt_check.cold+0x84/0x90 lib/smp_processor_id.c:64
 __mod_memcg_state+0x87/0x1a0 mm/memcontrol.c:702
 __split_huge_page mm/huge_memory.c:2575 [inline]
 split_huge_page_to_list+0x124b/0x3380 mm/huge_memory.c:2862
 split_huge_page include/linux/huge_mm.h:167 [inline]
 madvise_free_huge_pmd+0x873/0xb90 mm/huge_memory.c:1766
 madvise_free_pte_range+0x6ff/0x2650 mm/madvise.c:584
 walk_pmd_range mm/pagewalk.c:89 [inline]
 walk_pud_range mm/pagewalk.c:160 [inline]
 walk_p4d_range mm/pagewalk.c:193 [inline]
 walk_pgd_range mm/pagewalk.c:229 [inline]
 __walk_page_range+0xcfb/0x2070 mm/pagewalk.c:331
 walk_page_range+0x1bd/0x3a0 mm/pagewalk.c:427
 madvise_free_single_vma+0x384/0x550 mm/madvise.c:731
 madvise_dontneed_free mm/madvise.c:819 [inline]
 madvise_vma mm/madvise.c:958 [inline]
 do_madvise mm/madvise.c:1161 [inline]
 do_madvise+0x5ba/0x1b80 mm/madvise.c:1084
 __do_sys_madvise mm/madvise.c:1189 [inline]
 __se_sys_madvise mm/madvise.c:1187 [inline]
 __x64_sys_madvise+0xae/0x120 mm/madvise.c:1187
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460bf7
Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14
RSP: 002b:00007ffd6e086670 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000000460bf7
RDX: 0000000000000008 RSI: 000000000000a000 RDI: 000000c00029a000
RBP: 00007ffd6e0866b0 R08: 000000c000200000 R09: 000000c0002a4000
R10: 00007fffffffffff R11: 0000000000000246 R12: 0000000000000007
R13: 00007f30cae546d0 R14: 0000000000000080 R15: 00000000000000fa


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