BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 8000000141261067 P4D 8000000141261067 PUD 141264067 PMD 0
Oops: 0000 [#1] SMP PTI
CPU: 1 PID: 9213 Comm: syz-executor3 Not tainted 4.18.0-rc4+ #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_add_valid+0xad/0x450 lib/list_debug.c:26
Code: 48 89 5d b0 74 12 4c 89 e9 48 31 d1 48 f7 d0 48 21 c8 0f 84 0c 01 00 00 49 39 d5 0f 85 28 01 00 00 48 85 ff 0f 85 d5 01 00 00 <4c> 8b 2a 48 89 d7 e8 58 5d ae fd 4c 8b 30 8b 1a 4c 89 f0 48 0b 45
RSP: 0018:ffff8801a025f228 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8801bbcd5a18
RDX: 0000000000000000 RSI: 00000000eb000081 RDI: 0000000000000000
RBP: ffff8801a025f290 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000008 R12: ffff8801ae2aba10
R13: 0000000000000000 R14: 0000000000000000 R15: ffff880129322680
FS: 00007f390b847700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000140c82000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
__list_add include/linux/list.h:60 [inline]
list_add_tail include/linux/list.h:93 [inline]
__rwsem_down_write_failed_common+0x2e9/0x1480 kernel/locking/rwsem-xadd.c:523
rwsem_down_write_failed+0x2c/0x30 kernel/locking/rwsem-xadd.c:595
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
__down_write arch/x86/include/asm/rwsem.h:142 [inline]
down_write+0x5e/0xc0 kernel/locking/rwsem.c:72
lock_anon_vma_root mm/rmap.c:237 [inline]
unlink_anon_vmas+0x1db/0xc90 mm/rmap.c:387
free_pgtables+0x13e/0x6b0 mm/memory.c:628
exit_mmap+0x5a9/0xad0 mm/mmap.c:3106
__mmput+0x165/0x620 kernel/fork.c:971
mmput+0xbb/0x110 kernel/fork.c:992
exit_mm+0x6bb/0x7c0 kernel/exit.c:545
do_exit+0xc12/0x3930 kernel/exit.c:854
do_group_exit+0x1a0/0x360 kernel/exit.c:970
get_signal+0x15c3/0x2190 kernel/signal.c:2468
do_signal+0xca/0x2060 arch/x86/kernel/signal.c:816
exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
prepare_exit_to_usermode+0x297/0x430 arch/x86/entry/common.c:197
syscall_return_slowpath+0x108/0x800 arch/x86/entry/common.c:268
do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f390b846ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bec0 RCX: 0000000000455ab9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec0
RBP: 000000000072bec0 R08: 0000000000000000 R09: 000000000072bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e80f R14: 00007f390b8479c0 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
CR2: 0000000000000000
---[ end trace 7fa8c75a3270310a ]---
RIP: 0010:__list_add_valid+0xad/0x450 lib/list_debug.c:26
Code: 48 89 5d b0 74 12 4c 89 e9 48 31 d1 48 f7 d0 48 21 c8 0f 84 0c 01 00 00 49 39 d5 0f 85 28 01 00 00 48 85 ff 0f 85 d5 01 00 00 <4c> 8b 2a 48 89 d7 e8 58 5d ae fd 4c 8b 30 8b 1a 4c 89 f0 48 0b 45
RSP: 0018:ffff8801a025f228 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8801bbcd5a18
RDX: 0000000000000000 RSI: 00000000eb000081 RDI: 0000000000000000
RBP: ffff8801a025f290 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000008 R12: ffff8801ae2aba10
R13: 0000000000000000 R14: 0000000000000000 R15: ffff880129322680
FS: 00007f390b847700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000140c82000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600