======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/9783 is trying to acquire lock:
00000000cf905a94 (&sig->cred_guard_mutex){+.+.}, at: lock_trace fs/proc/base.c:402 [inline]
00000000cf905a94 (&sig->cred_guard_mutex){+.+.}, at: proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938
but task is already holding lock:
000000007acc3175 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&p->lock){+.+.}:
seq_read+0x6b/0x11c0 fs/seq_file.c:164
proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x471/0x630 fs/read_write.c:925
vfs_readv+0xe5/0x150 fs/read_write.c:987
kernel_readv fs/splice.c:362 [inline]
default_file_splice_read+0x457/0xa00 fs/splice.c:417
do_splice_to+0x10e/0x160 fs/splice.c:881
splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
do_splice_direct+0x1a7/0x270 fs/splice.c:1068
do_sendfile+0x550/0xc30 fs/read_write.c:1447
__do_sys_sendfile64 fs/read_write.c:1508 [inline]
__se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (sb_writers#3){.+.+}:
sb_start_write include/linux/fs.h:1579 [inline]
mnt_want_write+0x3a/0xb0 fs/namespace.c:360
ovl_xattr_set+0x53/0x600 fs/overlayfs/inode.c:338
__vfs_setxattr+0x10e/0x170 fs/xattr.c:149
__vfs_setxattr_noperm+0x11a/0x420 fs/xattr.c:180
__vfs_setxattr_locked+0x176/0x250 fs/xattr.c:238
vfs_setxattr+0xe5/0x270 fs/xattr.c:255
setxattr+0x23d/0x330 fs/xattr.c:520
path_setxattr+0x170/0x190 fs/xattr.c:539
__do_sys_setxattr fs/xattr.c:554 [inline]
__se_sys_setxattr fs/xattr.c:550 [inline]
__x64_sys_setxattr+0xc0/0x160 fs/xattr.c:550
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #1 (&ovl_i_mutex_key[depth]){+.+.}:
inode_lock include/linux/fs.h:748 [inline]
process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205
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_open_execat+0x11d/0x5b0 fs/exec.c:853
__do_execve_file+0x1a8b/0x2360 fs/exec.c:1770
do_execveat_common fs/exec.c:1879 [inline]
do_execve+0x35/0x50 fs/exec.c:1896
__do_sys_execve fs/exec.c:1977 [inline]
__se_sys_execve fs/exec.c:1972 [inline]
__x64_sys_execve+0x7c/0xa0 fs/exec.c:1972
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&sig->cred_guard_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:937 [inline]
__mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
lock_trace fs/proc/base.c:402 [inline]
proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938
proc_single_show+0xeb/0x170 fs/proc/base.c:755
seq_read+0x4e0/0x11c0 fs/seq_file.c:232
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x471/0x630 fs/read_write.c:925
vfs_readv+0xe5/0x150 fs/read_write.c:987
do_preadv fs/read_write.c:1071 [inline]
__do_sys_preadv fs/read_write.c:1121 [inline]
__se_sys_preadv fs/read_write.c:1116 [inline]
__x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116
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:
Chain exists of:
&sig->cred_guard_mutex --> sb_writers#3 --> &p->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&p->lock);
lock(sb_writers#3);
lock(&p->lock);
lock(&sig->cred_guard_mutex);
*** DEADLOCK ***
1 lock held by syz-executor.3/9783:
#0: 000000007acc3175 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164
stack backtrace:
CPU: 0 PID: 9783 Comm: syz-executor.3 Not tainted 4.19.211-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+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
__mutex_lock_common kernel/locking/mutex.c:937 [inline]
__mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
lock_trace fs/proc/base.c:402 [inline]
proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938
proc_single_show+0xeb/0x170 fs/proc/base.c:755
seq_read+0x4e0/0x11c0 fs/seq_file.c:232
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x471/0x630 fs/read_write.c:925
vfs_readv+0xe5/0x150 fs/read_write.c:987
do_preadv fs/read_write.c:1071 [inline]
__do_sys_preadv fs/read_write.c:1121 [inline]
__se_sys_preadv fs/read_write.c:1116 [inline]
__x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f9d844860e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9d82dda168 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f9d84599030 RCX: 00007f9d844860e9
RDX: 0000000000000001 RSI: 0000000020000400 RDI: 0000000000000003
RBP: 00007f9d844e008d R08: 0000000000000fff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffa42577df R14: 00007f9d82dda300 R15: 0000000000022000
audit: type=1326 audit(1652408238.279:7667): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=9777 comm="syz-executor.3" exe="/root/syz-executor.3" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f9d844860e9 code=0x0
audit: type=1326 audit(1652408239.429:7668): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=9854 comm="syz-executor.3" exe="/root/syz-executor.3" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f9d844860e9 code=0x0
kvm_set_msr_common: 12 callbacks suppressed
kvm [9879]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x25d6e37883b8e6ec
audit: type=1326 audit(1652408240.259:7669): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=9924 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f0f07a2c0e9 code=0x0
kvm [9922]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [9927]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [9957]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
audit: type=1326 audit(1652408240.459:7670): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=9968 comm="syz-executor.3" exe="/root/syz-executor.3" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f9d844860e9 code=0x0
kvm [9981]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
audit: type=1326 audit(1652408241.119:7671): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10000 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f0f07a2c0e9 code=0x0
kvm [9997]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
audit: type=1326 audit(1652408241.209:7672): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10000 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f0f07a2c0e9 code=0x0
kvm [10027]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10064]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
audit: type=1326 audit(1652408241.329:7673): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10067 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f0f07a2c0e9 code=0x0
kvm [10069]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0xa4c8403a000a011f
kvm [10081]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
audit: type=1326 audit(1652408241.339:7674): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10066 comm="syz-executor.3" exe="/root/syz-executor.3" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f9d844860e9 code=0x0
audit: type=1326 audit(1652408241.519:7675): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10123 comm="syz-executor.3" exe="/root/syz-executor.3" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f9d844860e9 code=0x0
audit: type=1326 audit(1652408242.360:7676): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10214 comm="syz-executor.3" exe="/root/syz-executor.3" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f9d844860e9 code=0x0
kvm [10210]: vcpu0, guest rIP: 0xfff0 ignored wrmsr: 0x11e data 0xa4c8403a000a011f
audit: type=1800 audit(1652408242.420:7677): pid=10238 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14065 res=0
audit: type=1326 audit(1652408242.530:7678): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10264 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f0f07a2c0e9 code=0x0
audit: type=1800 audit(1652408243.220:7679): pid=10295 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14849 res=0
audit: type=1800 audit(1652408243.220:7680): pid=10295 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14849 res=0
audit: type=1800 audit(1652408243.220:7681): pid=10295 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14849 res=0
audit: type=1800 audit(1652408243.220:7682): pid=10295 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14849 res=0
audit: type=1800 audit(1652408243.220:7683): pid=10295 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14849 res=0
kvm [10335]: vcpu0, guest rIP: 0xfff0 unimplemented HWCR wrmsr: 0x762ba46fa95b3224
audit: type=1800 audit(1652408243.220:7684): pid=10295 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14849 res=0
audit: type=1800 audit(1652408243.220:7685): pid=10295 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=14849 res=0
kvm_set_msr_common: 25 callbacks suppressed
kvm [10430]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10428]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10432]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x187 data 0xa4c8403a000a011f
kvm [10429]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10451]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10451]: vcpu0, guest rIP: 0xfff0 ignored wrmsr: 0x11e data 0xeeba025f48468bfa
kvm [10456]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10466]: vcpu0, guest rIP: 0xfff0 unimplemented MMIO_CONF_BASE wrmsr: 0x762ba46fa95f3264
kvm [10486]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10498]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10501]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kvm [10497]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc2 data 0x3ad6e37883b8e6ec
kauditd_printk_skb: 72 callbacks suppressed
audit: type=1326 audit(1652408247.680:7758): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10696 comm="syz-executor.3" exe="/root/syz-executor.3" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f9d844860e9 code=0x0
audit: type=1326 audit(1652408247.770:7759): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=10703 comm="syz-executor.0" exe="/root/syz-executor.0" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7f0f07a2c0e9 code=0x0