====================================
------------[ cut here ]------------
WARNING: syz-executor0/11693 still has locks held!
downgrading a read lock
WARNING: CPU: 1 PID: 11692 at kernel/locking/lockdep.c:3556 __lock_downgrade kernel/locking/lockdep.c:3556 [inline]
WARNING: CPU: 1 PID: 11692 at kernel/locking/lockdep.c:3556 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3819
4.20.0-rc4+ #356 Not tainted
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 11692 Comm: blkid Not tainted 4.20.0-rc4+ #356
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
 panic+0x2ad/0x55c kernel/panic.c:188
------------------------------------
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
1 lock held by syz-executor0/11693:
 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 d9 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:ffff88817c4d7b70 EFLAGS: 00010086
 #0: 000000005f77e643 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds+0x53/0x120 fs/exec.c:1405
RAX: 0000000000000000 RBX: 1ffff1102f89af74 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000006
RBP: ffff88817c4d7c28 R08: ffff8881ca120400 R09: fffffbfff12b2254
R10: fffffbfff12b2254 R11: ffffffff895912a3 R12: ffffffff8b0f77a0
R13: ffff88817c4d7bc0 R14: 0000000000000003 R15: ffff8881ca120400

stack backtrace:
 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: 0033:0x7f3075015417
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:00007ffd233c31e8 EFLAGS: 00000203 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 00007f30752201c8 RCX: 00007f3075015417
RDX: 00000000018fc000 RSI: 00000000000033ef RDI: 00007f3075218000
RBP: 00007ffd233c3350 R08: 0000000000000001 R09: 0000000000000007
R10: 00007f307500fa0b R11: 0000000000000203 R12: 000000006dc5986d
R13: 000000b46dc5986d R14: 000000b46c385af2 R15: 00007f3075215740
CPU: 0 PID: 11693 Comm: syz-executor0 Not tainted 4.20.0-rc4+ #356
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:1087 [inline]
 flush_old_exec+0x69e/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]
 do_execveat fs/exec.c:1895 [inline]
 __do_sys_execveat fs/exec.c:1976 [inline]
 __se_sys_execveat fs/exec.c:1968 [inline]
 __x64_sys_execveat+0xed/0x130 fs/exec.c:1968
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0e86e1cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 000000000072c040 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0e86e1d6d4
R13: 00000000004bdc9b R14: 00000000004cd1d8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..