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Subjectkernel BUG at mm/vmalloc.c:LINE! (2)
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Hello,

syzbot found the following crash on:

HEAD commit: 7cc2a8ea Merge tag 'block-5.8-2020-07-01' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=129af755100000
kernel config: https://syzkaller.appspot.com/x/.config?x=183dd243398ba7ec
dashboard link: https://syzkaller.appspot.com/bug?extid=5f326d255ca648131f87
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

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+5f326d255ca648131f87@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at mm/vmalloc.c:553!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3491 Comm: syz-executor.2 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:find_va_links mm/vmalloc.c:549 [inline]
RIP: 0010:merge_or_add_vmap_area mm/vmalloc.c:778 [inline]
RIP: 0010:__purge_vmap_area_lazy+0x18af/0x18c0 mm/vmalloc.c:1381
Code: e1 07 80 c1 03 38 c1 0f 8c f9 e8 ff ff 48 c7 c7 c8 2b 6d 89 e8 22 81 09 00 e9 e8 e8 ff ff e8 38 82 ca ff 0f 0b e8 31 82 ca ff <0f> 0b 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 1b 82 ca ff
RSP: 0018:ffffc900187f7800 EFLAGS: 00010283
RAX: ffffffff81a9f9df RBX: ffffc90007ea8000 RCX: 0000000000040000
RDX: ffffc9000d74c000 RSI: 0000000000026b24 RDI: 0000000000026b25
RBP: ffffc90007ea7000 R08: ffffffff81a9e3fd R09: fffffbfff12631ef
R10: fffffbfff12631ef R11: 0000000000000000 R12: ffffc90008703000
R13: dffffc0000000000 R14: ffff88808e51ea90 R15: ffffc90000000000
FS: 00007f40b9e29700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000b770 CR3: 000000019dad6000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
_vm_unmap_aliases+0x442/0x4d0 mm/vmalloc.c:1800
change_page_attr_set_clr+0x24b/0x5c0 arch/x86/mm/pat/set_memory.c:1732
change_page_attr_clear arch/x86/mm/pat/set_memory.c:1789 [inline]
set_memory_ro+0x5d/0x80 arch/x86/mm/pat/set_memory.c:1935
bpf_jit_binary_lock_ro include/linux/filter.h:815 [inline]
bpf_int_jit_compile+0x84a1/0x8910 arch/x86/net/bpf_jit_comp.c:1929
bpf_prog_select_runtime+0x76d/0xa60 kernel/bpf/core.c:1807
bpf_prog_load kernel/bpf/syscall.c:2198 [inline]
__do_sys_bpf+0xfabc/0x10c80 kernel/bpf/syscall.c:4114
do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f40b9e28c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00000000004db2a0 RCX: 000000000045cb29
RDX: 0000000000000048 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000070 R14: 00000000004c3450 R15: 00007f40b9e296d4
Modules linked in:
---[ end trace 0c5c57c9d5f27037 ]---
RIP: 0010:find_va_links mm/vmalloc.c:549 [inline]
RIP: 0010:merge_or_add_vmap_area mm/vmalloc.c:778 [inline]
RIP: 0010:__purge_vmap_area_lazy+0x18af/0x18c0 mm/vmalloc.c:1381
Code: e1 07 80 c1 03 38 c1 0f 8c f9 e8 ff ff 48 c7 c7 c8 2b 6d 89 e8 22 81 09 00 e9 e8 e8 ff ff e8 38 82 ca ff 0f 0b e8 31 82 ca ff <0f> 0b 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 1b 82 ca ff
RSP: 0018:ffffc900187f7800 EFLAGS: 00010283
RAX: ffffffff81a9f9df RBX: ffffc90007ea8000 RCX: 0000000000040000
RDX: ffffc9000d74c000 RSI: 0000000000026b24 RDI: 0000000000026b25
RBP: ffffc90007ea7000 R08: ffffffff81a9e3fd R09: fffffbfff12631ef
R10: fffffbfff12631ef R11: 0000000000000000 R12: ffffc90008703000
R13: dffffc0000000000 R14: ffff88808e51ea90 R15: ffffc90000000000
FS: 00007f40b9e29700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000b770 CR3: 000000019dad6000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
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