NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) ====================================================== WARNING: possible circular locking dependency detected 4.14.228-syzkaller #0 Not tainted ------------------------------------------------------ NILFS (loop5): invalid segment: Checksum error in segment payload syz-executor.4/22354 is trying to acquire lock: NILFS (loop5): unable to fall back to spare super block (&ovl_i_mutex_dir_key[depth]){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] (&ovl_i_mutex_dir_key[depth]){++++}, at: [] do_last fs/namei.c:3333 [inline] (&ovl_i_mutex_dir_key[depth]){++++}, at: [] path_openat+0x149b/0x2970 fs/namei.c:3569 but task is already holding lock: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds fs/exec.c:1404 [inline] (&sig->cred_guard_mutex){+.+.}, at: [] do_execveat_common+0x319/0x1f30 fs/exec.c:1748 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sig->cred_guard_mutex){+.+.}: __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_personality+0x48/0x160 fs/proc/base.c:2913 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 NILFS (loop5): error -22 while searching super root 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 (&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 -> #1 (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+0x64/0x260 fs/super.c:1342 sb_start_write include/linux/fs.h:1549 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 ovl_do_remove+0x67/0xb90 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 -> #0 (&ovl_i_mutex_dir_key[depth]){++++}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 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:1755 do_execve fs/exec.c:1860 [inline] SYSC_execve fs/exec.c:1941 [inline] SyS_execve+0x3b/0x50 fs/exec.c:1936 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: &ovl_i_mutex_dir_key[depth] --> &p->lock --> &sig->cred_guard_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sig->cred_guard_mutex); lock(&p->lock); lock(&sig->cred_guard_mutex); lock(&ovl_i_mutex_dir_key[depth]); *** DEADLOCK *** 1 lock held by syz-executor.4/22354: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds fs/exec.c:1404 [inline] #0: (&sig->cred_guard_mutex){+.+.}, at: [] do_execveat_common+0x319/0x1f30 fs/exec.c:1748 stack backtrace: CPU: 1 PID: 22354 Comm: syz-executor.4 Not tainted 4.14.228-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+0x1b2/0x281 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 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:1755 do_execve fs/exec.c:1860 [inline] SYSC_execve fs/exec.c:1941 [inline] SyS_execve+0x3b/0x50 fs/exec.c:1936 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f2903954188 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000466459 RDX: 0000000020000800 RSI: 0000000020000700 RDI: 0000000020000380 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffe645ca40f R14: 00007f2903954300 R15: 0000000000022000 Bluetooth: hci0 command 0x0409 tx timeout overlayfs: missing 'lowerdir' overlayfs: filesystem on './bus' not supported as upperdir netlink: 11 bytes leftover after parsing attributes in process `syz-executor.1'. NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) ieee80211 phy10: Selected rate control algorithm 'minstrel_ht' NILFS (loop5): invalid segment: Checksum error in segment payload kvm [22381]: vcpu0, guest rIP: 0x13c Hyper-V uhandled wrmsr: 0x4000001b data 0xf NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root ieee80211 phy10: hwaddr 02:00:00:00:0a:00 registered ieee80211 phy11: Selected rate control algorithm 'minstrel_ht' print_req_error: I/O error, dev loop4, sector 0 VFS: Found a V7 FS (block size = 512) on device loop4 ieee80211 phy11: hwaddr 02:00:00:00:0b:00 registered NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block ieee80211 phy12: Selected rate control algorithm 'minstrel_ht' NILFS (loop5): error -22 while searching super root ieee80211 phy12: hwaddr 02:00:00:00:0c:00 registered NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) hfsplus: invalid uid specified NILFS (loop5): invalid segment: Checksum error in segment payload hfsplus: unable to parse mount options NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root print_req_error: I/O error, dev loop0, sector 0 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root IPVS: ftp: loaded support on port[0] = 21 Bluetooth: hci0 command 0x041b tx timeout netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. Bluetooth: hci0 command 0x040f tx timeout NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 52 bytes leftover after parsing attributes in process `syz-executor.2'. IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready device batadv_slave_0 entered promiscuous mode team0: Port device batadv_slave_0 added netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. NILFS (loop5): invalid segment: Checksum error in segment payload netlink: 52 bytes leftover after parsing attributes in process `syz-executor.2'. NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. net_ratelimit: 502 callbacks suppressed arp_tables: arptables: counters copy to user failed while replacing table NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root ip_tables: iptables: counters copy to user failed while replacing table device ipvlan2 entered promiscuous mode NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) ip_tables: iptables: counters copy to user failed while replacing table NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) netlink: 28 bytes leftover after parsing attributes in process `syz-executor.4'. NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) device ipvlan2 entered promiscuous mode NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) Did not find alt setting 1 for intf 0, config 1 NILFS (loop5): invalid segment: Checksum error in segment payload usb usb1: usbfs: process 22775 (syz-executor.3) did not claim interface 1 before use NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root JFS: Cannot determine volume size jfs: Unrecognized mount option "fsname=$'}" or missing value NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) device veth7 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth7: link is not ready NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root Bluetooth: hci0 command 0x0419 tx timeout NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) ieee80211 phy13: Selected rate control algorithm 'minstrel_ht' NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block IPVS: ftp: loaded support on port[0] = 21 NILFS (loop5): error -22 while searching super root ieee80211 phy13: hwaddr 02:00:00:00:0d:00 registered NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) IPVS: ftp: loaded support on port[0] = 21 NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 1024) NILFS (loop5): broken superblock, retrying with spare superblock (blocksize = 2048) ntfs: (device nullb0): parse_options(): Unrecognized mount option tmpfs. NILFS (loop5): invalid segment: Checksum error in segment payload NILFS (loop5): unable to fall back to spare super block NILFS (loop5): error -22 while searching super root IPVS: ftp: loaded support on port[0] = 21 overlayfs: fs on './file0' does not support file handles, falling back to index=off.