Hello,
syzbot found the following crash on:
HEAD commit: 7c98a4261827 Merge tag 'ceph-for-4.20-rc4' of https://gith..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12d81015400000
kernel config: https://syzkaller.appspot.com/x/.config?x=73e2bc0cb6463446
dashboard link: https://syzkaller.appspot.com/bug?extid=b70f2aabc707c69c9239
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c9e26d400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14e1234d400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b70f2aabc707c69c9239@xxxxxxxxxxxxxxxxxxxxxxxxx
audit: type=1400 audit(1543059836.603:35): avc: denied { map } for
pid=6203 comm="bash" path="/bin/bash" dev="sda1" ino=1457
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(1543059843.273:36): avc: denied { map } for
pid=6217 comm="syz-executor552" path="/root/syz-executor552394561"
dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
====================================
WARNING: syz-executor552/6218 still has locks held!
4.20.0-rc3+ #127 Not tainted
------------------------------------
1 lock held by syz-executor552/6218:
#0: 000000004754a9eb (&sig->cred_guard_mutex){+.+.}, at:
prepare_bprm_creds+0x53/0x120 fs/exec.c:1405
stack backtrace:
CPU: 0 PID: 6218 Comm: syz-executor552 Not tainted 4.20.0-rc3+ #127
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+0xa39/0x5620 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: 0033:0x445639
Code: e8 ec b8 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 8b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5efaee7d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445639
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00000000006dac20 R08: 0000000000001000 R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5efaee7d20
R13: 00000000006dac2c R14: 0000000020000280 R15: 00000000006dad2c
---
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