BUG: Bad page map (4)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: c99b17ac Add linux-next specific files for 20200225
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1012fa81e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=6b7ebe4bd0931c45
dashboard link: https://syzkaller.appspot.com/bug?extid=5f10718b9688f3ce609e
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+5f1071...@syzkaller.appspotmail.com

BUG: Bad page map in process udevd pte:77007770 pmd:00172067
addr:00007f08bce11000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979b1b10 index:1aa
file:libnss_nis-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Not tainted 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
vm_normal_page+0x244/0x3c0 mm/memory.c:609
zap_pte_range mm/memory.c:1053 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x98f/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
BUG: Bad page map in process udevd pte:00000700 pmd:00172067
addr:00007f08bcebb000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979aea50 index:49
file:libnsl-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
vm_normal_page+0x244/0x3c0 mm/memory.c:609
zap_pte_range mm/memory.c:1053 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x98f/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
swap_info_get: Bad swap file entry 3ffffffc44447
BUG: Bad page map in process udevd pte:77777000 pmd:00172067
addr:00007f08bcf1b000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979aea50 index:a9
file:libnsl-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
zap_pte_range mm/memory.c:1126 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x1cd6/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
BUG: Bad page map in process udevd pte:00700777 pmd:00172067
addr:00007f08bcf65000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979aea50 index:f3
file:libnsl-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
vm_normal_page+0x244/0x3c0 mm/memory.c:609
zap_pte_range mm/memory.c:1053 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x98f/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
swap_info_get: Bad swap file entry 3ffffffffc7ff
BUG: Bad page map in process udevd pte:00700000 pmd:00172067
addr:00007f08bcfba000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979aea50 index:148
file:libnsl-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
zap_pte_range mm/memory.c:1126 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x1cd6/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
swap_info_get: Bad swap file entry 3fffffffc7c47
BUG: Bad page map in process udevd pte:07077000 pmd:00173067
addr:00007f08bd00f000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979aea50 index:19d
file:libnsl-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
zap_pte_range mm/memory.c:1126 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x1cd6/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
BUG: Bad page map in process udevd pte:77770707 pmd:00173067
addr:00007f08bd064000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979aea50 index:1f2
file:libnsl-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
vm_normal_page+0x244/0x3c0 mm/memory.c:609
zap_pte_range mm/memory.c:1053 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x98f/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
swap_info_get: Bad swap file entry 3ffffffc7c7ff
BUG: Bad page map in process udevd pte:70700000 pmd:00173067
addr:00007f08bd06f000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979aea50 index:1fd
file:libnsl-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
zap_pte_range mm/memory.c:1126 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x1cd6/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
BUG: Bad page map in process udevd pte:77000770 pmd:00173067
addr:00007f08bd10e000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979ac9d0 index:84
file:libnss_compat-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
vm_normal_page+0x244/0x3c0 mm/memory.c:609
zap_pte_range mm/memory.c:1053 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x98f/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f08bd760207
RDX: 0000000001f622f0 RSI: 00007fff1a787fc0 RDI: 00007fff1a788fd0
RBP: 0000000000625500 R08: 0000000000000ddf R09: 0000000000000ddf
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000001f622f0
R13: 0000000000000007 R14: 0000000001f50250 R15: 0000000000000005
BUG: Bad page map in process udevd pte:77770770 pmd:00173067
addr:00007f08bd163000 vm_flags:08000070 anon_vma:0000000000000000 mapping:ffff8880979ac9d0 index:d9
file:libnss_compat-2.13.so fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
CPU: 0 PID: 16669 Comm: udevd Tainted: G B 5.6.0-rc3-next-20200225-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+0x197/0x210 lib/dump_stack.c:118
print_bad_pte.cold+0x1d5/0x232 mm/memory.c:546
vm_normal_page+0x244/0x3c0 mm/memory.c:609
zap_pte_range mm/memory.c:1053 [inline]
zap_pmd_range mm/memory.c:1184 [inline]
zap_pud_range mm/memory.c:1213 [inline]
zap_p4d_range mm/memory.c:1234 [inline]
unmap_page_range+0x98f/0x2820 mm/memory.c:1255
unmap_single_vma+0x19d/0x300 mm/memory.c:1300
unmap_vmas+0x184/0x2f0 mm/memory.c:1332
exit_mmap+0x2ba/0x530 mm/mmap.c:3141
__mmput kernel/fork.c:1090 [inline]
mmput+0x179/0x4d0 kernel/fork.c:1111
exec_mmap fs/exec.c:1077 [inline]
flush_old_exec+0x8ef/0x1e80 fs/exec.c:1310
load_elf_binary+0x8ae/0x4ab0 fs/binfmt_elf.c:846
search_binary_handler fs/exec.c:1688 [inline]
search_binary_handler+0x16d/0x570 fs/exec.c:1665
exec_binprm fs/exec.c:1731 [inline]
__do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1851
do_execveat_common fs/exec.c:1897 [inline]
do_execve fs/exec.c:1914 [inline]
__do_sys_execve fs/exec.c:1990 [inline]
__se_sys_execve fs/exec.c:1985 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1985
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f08bd760207
Code: Bad RIP value.
RSP: 002b:00007fff1a787ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b


---
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Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.