binder: 10984:10989 ioctl c0306201 0 returned -14 ====================================================== WARNING: possible circular locking dependency detected 4.14.193-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/10988 is trying to acquire lock: (&sig->cred_guard_mutex){+.+.}, at: [] lock_trace fs/proc/base.c:407 [inline] (&sig->cred_guard_mutex){+.+.}, at: [] proc_pid_stack+0x13f/0x2f0 fs/proc/base.c:457 but task is already holding lock: (&p->lock){+.+.}, at: [] seq_read+0xba/0x1120 fs/seq_file.c:165 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 seq_read+0xba/0x1120 fs/seq_file.c:165 proc_reg_read+0xee/0x1a0 fs/proc/inode.c:217 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 kernel_readv fs/splice.c:361 [inline] default_file_splice_read+0x418/0x910 fs/splice.c:416 do_splice_to+0xfb/0x140 fs/splice.c:880 splice_direct_to_actor+0x207/0x730 fs/splice.c:952 do_splice_direct+0x164/0x210 fs/splice.c:1061 do_sendfile+0x47f/0xb30 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0xff/0x110 fs/read_write.c:1488 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #2 (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+0x19a/0x2e0 fs/super.c:1363 sb_start_write include/linux/fs.h:1549 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 ovl_do_remove+0x65/0xaf0 fs/overlayfs/dir.c:759 vfs_rmdir.part.0+0x144/0x390 fs/namei.c:3908 vfs_rmdir fs/namei.c:3893 [inline] do_rmdir+0x334/0x3c0 fs/namei.c:3968 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] do_last fs/namei.c:3333 [inline] path_openat+0x149b/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_open_execat+0xd3/0x450 fs/exec.c:849 do_execveat_common+0x711/0x1f30 fs/exec.c:1742 do_execveat fs/exec.c:1858 [inline] SYSC_execveat fs/exec.c:1939 [inline] SyS_execveat+0x51/0x70 fs/exec.c:1931 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&sig->cred_guard_mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 lock_trace fs/proc/base.c:407 [inline] proc_pid_stack+0x13f/0x2f0 fs/proc/base.c:457 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4cf/0x1120 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_preadv fs/read_write.c:1065 [inline] SYSC_preadv fs/read_write.c:1115 [inline] SyS_preadv+0x15a/0x200 fs/read_write.c:1110 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb 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.3/10988: #0: (&p->lock){+.+.}, at: [] seq_read+0xba/0x1120 fs/seq_file.c:165 stack backtrace: CPU: 1 PID: 10988 Comm: syz-executor.3 Not tainted 4.14.193-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 lock_trace fs/proc/base.c:407 [inline] proc_pid_stack+0x13f/0x2f0 fs/proc/base.c:457 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4cf/0x1120 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_preadv fs/read_write.c:1065 [inline] SYSC_preadv fs/read_write.c:1115 [inline] SyS_preadv+0x15a/0x200 fs/read_write.c:1110 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007f2dc73e1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000024ac0 RCX: 000000000045d239 RDX: 00000000000001a1 RSI: 00000000200017c0 RDI: 0000000000000006 RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fffb8c2723f R14: 00007f2dc73e29c0 R15: 000000000118cf4c lo: Cannot use loopback or non-ethernet device as HSR slave. binder: 10984:11010 ioctl c0306201 0 returned -14 audit: type=1804 audit(1597664698.363:47): pid=11011 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir911213021/syzkaller.glDm2N/63/bus" dev="sda1" ino=16062 res=1 audit: type=1800 audit(1597664698.363:48): pid=11011 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=16062 res=0 lo: Cannot use loopback or non-ethernet device as HSR slave. audit: type=1804 audit(1597664698.383:49): pid=11011 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir911213021/syzkaller.glDm2N/63/bus" dev="sda1" ino=16062 res=1 audit: type=1804 audit(1597664698.383:50): pid=11011 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir911213021/syzkaller.glDm2N/63/bus" dev="sda1" ino=16062 res=1 audit: type=1800 audit(1597664698.383:51): pid=11011 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=16062 res=0 ip6t_rpfilter: unknown options encountered ip6t_rpfilter: unknown options encountered audit: type=1800 audit(1597664698.723:52): pid=11080 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=16061 res=0 overlayfs: unrecognized mount option "work" or missing value overlayfs: unrecognized mount option "work" or missing value overlayfs: upperdir is in-use by another mount, accessing files from both mounts will result in undefined behavior. overlayfs: workdir is in-use by another mount, accessing files from both mounts will result in undefined behavior. ip_tables: iptables: counters copy to user failed while replacing table audit: type=1804 audit(1597664699.653:53): pid=11141 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir911213021/syzkaller.glDm2N/66/cgroup.controllers" dev="sda1" ino=16068 res=1 ip_tables: iptables: counters copy to user failed while replacing table xt_connbytes: cannot load conntrack support for proto=10 xt_connbytes: Forcing CT accounting to be enabled Debayer A: ================= START STATUS ================= Debayer A: ================== END STATUS ================== xt_connbytes: cannot load conntrack support for proto=10 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. device bridge12 entered promiscuous mode ieee80211 M: Selected rate control algorithm 'minstrel_ht' ieee80211 M: hwaddr 02:00:00:00:0b:00 registered ieee80211 phy12: Selected rate control algorithm 'minstrel_ht' ieee80211 phy12: hwaddr 02:00:00:00:0c:00 registered blktrace: Concurrent blktraces are not allowed on nullb0 audit: type=1804 audit(1597664700.533:54): pid=11248 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir008805110/syzkaller.6cgzEO/61/bus" dev="sda1" ino=16082 res=1 audit: type=1804 audit(1597664700.613:55): pid=11252 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir008805110/syzkaller.6cgzEO/61/bus" dev="sda1" ino=16082 res=1 Process accounting resumed audit: type=1804 audit(1597664700.833:56): pid=11261 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir740545843/syzkaller.3jgZJO/69/file1/file0" dev="loop5" ino=153 res=1 hfsplus: invalid session number or type of track hfsplus: unable to find HFS+ superblock hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table hfs: unable to parse mount options Cannot find set identified by id 0 to match Cannot find set identified by id 0 to match netlink: 16 bytes leftover after parsing attributes in process `syz-executor.1'. new mount options do not match the existing superblock, will be ignored netlink: 16 bytes leftover after parsing attributes in process `syz-executor.1'. new mount options do not match the existing superblock, will be ignored ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table kauditd_printk_skb: 2 callbacks suppressed audit: type=1800 audit(1597664704.363:59): pid=11451 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=16117 res=0 attempt to access beyond end of device loop3: rw=1, want=230, limit=54 attempt to access beyond end of device loop3: rw=1, want=62, limit=54 audit: type=1800 audit(1597664704.563:60): pid=11451 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=16117 res=0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=11508 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=11512 comm=syz-executor.1 netlink: 72 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 72 bytes leftover after parsing attributes in process `syz-executor.3'.