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SubjectRe: BUG: unable to handle kernel (3)
From
syzbot has found a reproducer for the following crash on:

HEAD commit: 4ca559bbdeaf kmsan: fix assertions in IRQ entry/exit hooks.
git tree: https://github.com/google/kmsan.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=13dafb20400000
kernel config: https://syzkaller.appspot.com/x/.config?x=848e40757852af3e
dashboard link: https://syzkaller.appspot.com/bug?extid=adfeaaee641dd4fdac43
compiler: clang version 7.0.0 (trunk 334104)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=15497384400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=123a42a4400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+adfeaaee641dd4fdac43@syzkaller.appspotmail.com

RDX: 0000000020000140 RSI: 0000000020000100 RDI: 00000000200000c0
RBP: 0000000000000000 R08: 00000000fffffffc R09: 0000000000000039
R10: 0000000000000311 R11: 0000000000000246 R12: 00007f00bc56bd80
R13: 00000000006dbc38 R14: 0000000000000006 R15: 0079656b5f676962
CPU: 1 PID: 4528 Comm: syz-executor237 Not tainted 4.17.0+ #17
BUG: unable to handle kernel
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
NULL pointer dereference at 0000000000000008
Call Trace:
PGD 800000019f3d5067 P4D 800000019f3d5067
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x185/0x1d0 lib/dump_stack.c:113
PUD 19ce9d067
fail_dump lib/fault-inject.c:51 [inline]
should_fail+0x87b/0xab0 lib/fault-inject.c:149
PMD 0
__should_failslab+0x278/0x2a0 mm/failslab.c:32
Oops: 0000 [#1] SMP PTI
should_failslab+0x29/0x70 mm/slab_common.c:1522
Dumping ftrace buffer:
slab_pre_alloc_hook mm/slab.h:423 [inline]
slab_alloc_node mm/slub.c:2679 [inline]
__kmalloc_node+0x22f/0x1200 mm/slub.c:3859
(ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4533 Comm: syz-executor237 Not tainted 4.17.0+ #17
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:map_vm_area+0x69/0x1f0 mm/vmalloc.c:1353
RSP: 0018:ffff8801c07df8b8 EFLAGS: 00010046
kmalloc_node include/linux/slab.h:554 [inline]
alloc_vmap_area+0x1e6/0x15a0 mm/vmalloc.c:420
RAX: ffffffff81b1e4bc RBX: 0000000000000000 RCX: ffff8801a8e58000
RDX: 0000000000000000 RSI: 8000000000000063 RDI: 0000000000000000
__get_vm_area_node+0x3a6/0x810 mm/vmalloc.c:1410
RBP: ffff8801c07df930 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900019fffff R11: 0000000000000000 R12: ffffffff8b58d000
get_vm_area_caller+0xdb/0xf0 mm/vmalloc.c:1456
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000000
FS: 00007f00bc56c700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000019e7d2000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kmsan_vmap+0x79/0x1e0 mm/kmsan/kmsan.c:875
Call Trace:
vmap+0x3b2/0x4b0 mm/vmalloc.c:1661
kmsan_vmap+0x137/0x1e0 mm/kmsan/kmsan.c:888
vmap+0x3b2/0x4b0 mm/vmalloc.c:1661
big_key_alloc_buffer+0x638/0xa30 security/keys/big_key.c:188
big_key_preparse+0x20a/0xed0 security/keys/big_key.c:228
big_key_alloc_buffer+0x638/0xa30 security/keys/big_key.c:188
big_key_preparse+0x20a/0xed0 security/keys/big_key.c:228
key_create_or_update+0x7a6/0x1a80 security/keys/key.c:849
__do_sys_add_key security/keys/keyctl.c:122 [inline]
__se_sys_add_key+0x741/0x980 security/keys/keyctl.c:62
key_create_or_update+0x7a6/0x1a80 security/keys/key.c:849
__do_sys_add_key security/keys/keyctl.c:122 [inline]
__se_sys_add_key+0x741/0x980 security/keys/keyctl.c:62
__x64_sys_add_key+0x15d/0x1b0 security/keys/keyctl.c:62
__x64_sys_add_key+0x15d/0x1b0 security/keys/keyctl.c:62
do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x63/0xe7
do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
RIP: 0033:0x445dc9
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RSP: 002b:00007f00bc58cd78 EFLAGS: 00000246
RIP: 0033:0x445dc9
RSP: 002b:00007f00bc56bd78 EFLAGS: 00000246
ORIG_RAX: 00000000000000f8
ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000445dc9
RAX: ffffffffffffffda RBX: 00000000006dbc3c RCX: 0000000000445dc9
RDX: 0000000020000140 RSI: 0000000020000100 RDI: 00000000200000c0
RDX: 0000000020000140 RSI: 0000000020000100 RDI: 00000000200000c0
RBP: 0000000000000000 R08: 00000000fffffffc R09: 0000000000000039
RBP: 0000000000000000 R08: 00000000fffffffc R09: 0000000000000039
R10: 0000000000000311 R11: 0000000000000246 R12: 00007f00bc56bd80
R13: 00000000006dbc38 R14: 0000000000000006 R15: 0079656b5f676962
R10: 0000000000000311 R11: 0000000000000246 R12: 00007f00bc58cd80
Code:
R13: 00000000006dbc20 R14: 0000000000000005 R15: 0079656b5f676962
24
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
08 48 89 45 a0 41 8b 84 24 90 0c 00 00 89 45 cc 45 8b bc 24 88 0c 00 00 e8
54 fa b3 ff 4d 8d 75 08 48 85 db 0f 85 5b 01 00 00 <49> 8b 45 08 48 89 45
CPU: 1 PID: 4530 Comm: syz-executor237 Not tainted 4.17.0+ #17
a8 4c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
89
Call Trace:
f7 e8
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x185/0x1d0 lib/dump_stack.c:113
57
fail_dump lib/fault-inject.c:51 [inline]
should_fail+0x87b/0xab0 lib/fault-inject.c:149
bd
__should_failslab+0x278/0x2a0 mm/failslab.c:32
0e 00
should_failslab+0x29/0x70 mm/slab_common.c:1522
4d
slab_pre_alloc_hook mm/slab.h:423 [inline]
slab_alloc_node mm/slub.c:2679 [inline]
__kmalloc_node+0x22f/0x1200 mm/slub.c:3859
8d
75 18
48
RIP: map_vm_area+0x69/0x1f0 mm/vmalloc.c:1353 RSP: ffff8801c07df8b8
kmalloc_node include/linux/slab.h:554 [inline]
alloc_vmap_area+0x1e6/0x15a0 mm/vmalloc.c:420
CR2: 0000000000000008
---[ end trace 6c00f5bb0b95940c ]---
__get_vm_area_node+0x3a6/0x810 mm/vmalloc.c:1410

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