nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/9863 is trying to acquire lock: 00000000ebb99faf (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting fs/proc/base.c:2750 [inline] 00000000ebb99faf (&sig->cred_guard_mutex){+.+.}, at: proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2793 but task is already holding lock: 00000000f890ddb9 (&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 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 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. 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_create_object+0x96/0x290 fs/overlayfs/dir.c:602 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 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 -> #1 (&ovl_i_mutex_dir_key[depth]#2){++++}: inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/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 do_io_accounting fs/proc/base.c:2750 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2793 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 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 *** 2 locks held by syz-executor.1/9863: #0: 000000000f73cb67 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 00000000f890ddb9 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 stack backtrace: CPU: 1 PID: 9863 Comm: syz-executor.1 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 do_io_accounting fs/proc/base.c:2750 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2793 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f8a5fdda109 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:00007f8a5e74f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f8a5feecf60 RCX: 00007f8a5fdda109 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00007f8a5fe3405d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb5672c8f R14: 00007f8a5e74f300 R15: 0000000000022000 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. IPVS: ftp: loaded support on port[0] = 21 tmpfs: Bad value '' for mount option 'mpol' overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. wlan1: Trigger new scan to find an IBSS to join overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt netlink: 16 bytes leftover after parsing attributes in process `syz-executor.4'. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt wlan1: Trigger new scan to find an IBSS to join ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt batadv_slave_0: mtu less than device minimum overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt IPVS: ftp: loaded support on port[0] = 21 ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt IPVS: ftp: loaded support on port[0] = 21 ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt wlan1: Trigger new scan to find an IBSS to join overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt IPVS: ftp: loaded support on port[0] = 21 ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt IPVS: ftp: loaded support on port[0] = 21 ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. wlan1: Creating new IBSS network, BSSID 66:0a:a8:ab:4f:51 ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt overlayfs: './file0' not a directory ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt