====================================
------------[ cut here ]------------
WARNING: syz-executor0/8108 still has locks held!
downgrading a read lock
WARNING: CPU: 0 PID: 8105 at kernel/locking/lockdep.c:3556 __lock_downgrade kernel/locking/lockdep.c:3556 [inline]
WARNING: CPU: 0 PID: 8105 at kernel/locking/lockdep.c:3556 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3819
4.20.0-rc4+ #260 Not tainted
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8105 Comm: blkid Not tainted 4.20.0-rc4+ #260
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+0x244/0x39d lib/dump_stack.c:113
1 lock held by syz-executor0/8108:
 panic+0x2ad/0x55c kernel/panic.c:188
 #0: 000000003fc576e9 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds+0x53/0x120 fs/exec.c:1405
 __warn.cold.8+0x20/0x45 kernel/panic.c:540

stack backtrace:
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:__lock_downgrade kernel/locking/lockdep.c:3556 [inline]
RIP: 0010:lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3819
Code: 00 00 fc ff df 41 c6 44 05 00 f8 e9 1b ff ff ff 48 c7 c7 60 68 2b 88 4c 89 9d 58 ff ff ff 48 89 85 60 ff ff ff e8 29 1f e7 ff <0f> 0b 48 8b 85 60 ff ff ff 4c 8d 4d d8 4c 89 e9 48 ba 00 00 00 00
RSP: 0018:ffff88818479fb70 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff110308f3f74 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8165eba5 RDI: 0000000000000006
RBP: ffff88818479fc28 R08: ffff8881bbaca2c0 R09: fffffbfff12b2254
R10: fffffbfff12b2254 R11: ffffffff895912a3 R12: ffffffff8b0f77a0
R13: ffff88818479fbc0 R14: 0000000000000001 R15: ffff8881bbaca2c0
 downgrade_write+0x76/0x270 kernel/locking/rwsem.c:147
 __do_munmap+0xcd8/0xf80 mm/mmap.c:2812
 __vm_munmap+0x138/0x1f0 mm/mmap.c:2837
 __do_sys_munmap mm/mmap.c:2862 [inline]
 __se_sys_munmap mm/mmap.c:2859 [inline]
 __x64_sys_munmap+0x65/0x80 mm/mmap.c:2859
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f30731bf417
Code: f0 ff ff 73 01 c3 48 8d 0d 8a ad 20 00 31 d2 48 29 c2 89 11 48 83 c8 ff eb eb 90 90 90 90 90 90 90 90 90 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 5d ad 20 00 31 d2 48 29 c2 89
RSP: 002b:00007ffd02387fe8 EFLAGS: 00000203 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 00007f30733ca1c8 RCX: 00007f30731bf417
RDX: 00000000000e7400 RSI: 00000000000033ef RDI: 00007f30733c2000
RBP: 00007ffd02388150 R08: 0000000000000001 R09: 0000000000000007
R10: 00007f30731b9a0b R11: 0000000000000203 R12: 00000000a07bab44
R13: 00000062a07bab44 R14: 00000062a06eb68d R15: 00007f30733bf740
CPU: 1 PID: 8108 Comm: syz-executor0 Not tainted 4.20.0-rc4+ #260
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+0x244/0x39d lib/dump_stack.c:113
 print_held_locks_bug kernel/locking/lockdep.c:4362 [inline]
 debug_check_no_locks_held.cold.49+0x93/0x9f kernel/locking/lockdep.c:4368
 try_to_freeze include/linux/freezer.h:66 [inline]
 freezer_count include/linux/freezer.h:128 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 de_thread fs/exec.c:1115 [inline]
 flush_old_exec+0x1ea2/0x2480 fs/exec.c:1262
 load_elf_binary+0xa9a/0x5cf0 fs/binfmt_elf.c:869
 search_binary_handler+0x17d/0x570 fs/exec.c:1654
 exec_binprm fs/exec.c:1696 [inline]
 __do_execve_file.isra.33+0x1661/0x25d0 fs/exec.c:1820
 do_execveat_common fs/exec.c:1867 [inline]
 compat_do_execveat fs/exec.c:1927 [inline]
 __do_compat_sys_execveat fs/exec.c:1997 [inline]
 __se_compat_sys_execveat fs/exec.c:1989 [inline]
 __ia32_compat_sys_execveat+0xf3/0x140 fs/exec.c:1989
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f42a29
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5f3e0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000166
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000001000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..