======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/12306 is trying to acquire lock:
00000000490412e8 (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline]
00000000490412e8 (sb_writers#3){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360
but task is already holding lock:
000000005a3e71f4 (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&iint->mutex){+.+.}:
process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224
ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391
do_last fs/namei.c:3425 [inline]
path_openat+0x7e4/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (sb_writers#3){.+.+}:
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x6e/0x2a0 fs/super.c:1366
sb_start_write include/linux/fs.h:1579 [inline]
mnt_want_write+0x3a/0xb0 fs/namespace.c:360
ovl_maybe_copy_up+0x11f/0x190 fs/overlayfs/copy_up.c:888
ovl_open+0xb4/0x260 fs/overlayfs/file.c:126
do_dentry_open+0x4aa/0x1160 fs/open.c:796
vfs_open fs/open.c:902 [inline]
dentry_open+0x132/0x1d0 fs/open.c:918
ima_calc_file_hash+0x628/0x8a0 security/integrity/ima/ima_crypto.c:435
ima_collect_measurement+0x4c4/0x570 security/integrity/ima/ima_api.c:231
process_measurement+0xddd/0x1440 security/integrity/ima/ima_main.c:284
ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391
do_last fs/namei.c:3425 [inline]
path_openat+0x7e4/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&iint->mutex);
lock(sb_writers#3);
lock(&iint->mutex);
lock(sb_writers#3);
*** DEADLOCK ***
1 lock held by syz-executor.0/12306:
#0: 000000005a3e71f4 (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224
stack backtrace:
CPU: 1 PID: 12306 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222
check_prev_add kernel/locking/lockdep.c:1866 [inline]
check_prevs_add kernel/locking/lockdep.c:1979 [inline]
validate_chain kernel/locking/lockdep.c:2420 [inline]
__lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x6e/0x2a0 fs/super.c:1366
sb_start_write include/linux/fs.h:1579 [inline]
mnt_want_write+0x3a/0xb0 fs/namespace.c:360
ovl_maybe_copy_up+0x11f/0x190 fs/overlayfs/copy_up.c:888
ovl_open+0xb4/0x260 fs/overlayfs/file.c:126
do_dentry_open+0x4aa/0x1160 fs/open.c:796
vfs_open fs/open.c:902 [inline]
dentry_open+0x132/0x1d0 fs/open.c:918
ima_calc_file_hash+0x628/0x8a0 security/integrity/ima/ima_crypto.c:435
ima_collect_measurement+0x4c4/0x570 security/integrity/ima/ima_api.c:231
process_measurement+0xddd/0x1440 security/integrity/ima/ima_main.c:284
ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391
do_last fs/namei.c:3425 [inline]
path_openat+0x7e4/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f1697eb80f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f169642a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1697fd7f80 RCX: 00007f1697eb80f9
RDX: 0000000000000003 RSI: 00000000200001c0 RDI: ffffffffffffff9c
RBP: 00007f1697f13ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdf245890f R14: 00007f169642a300 R15: 0000000000022000
BTRFS info (device loop1): enabling inode map caching
BTRFS warning (device loop1): excessive commit interval 622039222
BTRFS info (device loop1): force zlib compression, level 3
BTRFS info (device loop1): using free space tree
BTRFS info (device loop1): has skinny extents
audit: type=1804 audit(1677984772.500:1041): pid=12362 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir2427870175/syzkaller.omht5w/797/bus" dev="sda1" ino=14002 res=1
BTRFS info (device loop1): enabling inode map caching
BTRFS warning (device loop1): excessive commit interval 622039222
BTRFS info (device loop1): force zlib compression, level 3
BTRFS info (device loop1): using free space tree
BTRFS info (device loop1): has skinny extents
audit: type=1804 audit(1677984773.470:1042): pid=12498 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir2427870175/syzkaller.omht5w/798/bus" dev="sda1" ino=13895 res=1
audit: type=1804 audit(1677984773.600:1043): pid=12435 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir3159953796/syzkaller.k5sEfs/832/bus" dev="sda1" ino=13970 res=1
audit: type=1804 audit(1677984773.940:1044): pid=12541 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir2212996279/syzkaller.pYfJnS/210/bus" dev="sda1" ino=13889 res=1
audit: type=1804 audit(1677984774.040:1045): pid=12561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir2212996279/syzkaller.pYfJnS/210/bus" dev="sda1" ino=13889 res=1
BTRFS info (device loop1): enabling inode map caching
BTRFS warning (device loop1): excessive commit interval 622039222
BTRFS info (device loop1): force zlib compression, level 3
BTRFS info (device loop1): using free space tree
BTRFS info (device loop1): has skinny extents
audit: type=1804 audit(1677984775.700:1046): pid=12469 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3596348995/syzkaller.rhY6pU/764/bus" dev="sda1" ino=13921 res=1
audit: type=1804 audit(1677984775.940:1047): pid=12641 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir2212996279/syzkaller.pYfJnS/211/bus" dev="sda1" ino=13941 res=1
audit: type=1804 audit(1677984775.980:1048): pid=12640 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir2212996279/syzkaller.pYfJnS/211/bus" dev="sda1" ino=13941 res=1
audit: type=1804 audit(1677984776.170:1049): pid=12662 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir2212996279/syzkaller.pYfJnS/212/bus" dev="sda1" ino=14083 res=1
audit: type=1804 audit(1677984776.230:1050): pid=12673 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir2212996279/syzkaller.pYfJnS/212/bus" dev="sda1" ino=14083 res=1
BTRFS info (device loop1): enabling inode map caching
BTRFS warning (device loop1): excessive commit interval 622039222
BTRFS info (device loop1): force zlib compression, level 3
BTRFS info (device loop1): using free space tree
BTRFS info (device loop1): has skinny extents
BTRFS info (device loop1): enabling inode map caching
BTRFS warning (device loop1): excessive commit interval 622039222
BTRFS info (device loop1): force zlib compression, level 3
BTRFS info (device loop1): using free space tree
BTRFS info (device loop1): has skinny extents
kauditd_printk_skb: 1 callbacks suppressed
audit: type=1804 audit(1677984779.960:1052): pid=12732 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3596348995/syzkaller.rhY6pU/766/bus" dev="sda1" ino=13901 res=1
BTRFS info (device loop1): enabling inode map caching
BTRFS warning (device loop1): excessive commit interval 622039222
BTRFS info (device loop1): force zlib compression, level 3
BTRFS info (device loop1): using free space tree
BTRFS info (device loop1): has skinny extents