====================================================== WARNING: possible circular locking dependency detected 4.19.184-syzkaller #0 Not tainted ------------------------------------------------------ xt_CT: No such helper "snmp_trap" syz-executor.0/20853 is trying to acquire lock: 000000004730f475 (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting fs/proc/base.c:2737 [inline] 000000004730f475 (&sig->cred_guard_mutex){+.+.}, at: proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2780 but task is already holding lock: 0000000028d5c98c (&p->lock){+.+.}, at: seq_read+0x6b/0x1160 fs/seq_file.c:161 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: seq_read+0x6b/0x1160 fs/seq_file.c:161 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_do_remove+0xf0/0xdb0 fs/overlayfs/dir.c:843 vfs_rmdir.part.0+0x10f/0x3d0 fs/namei.c:3882 vfs_rmdir fs/namei.c:3868 [inline] do_rmdir+0x3fd/0x490 fs/namei.c:3943 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:925 [inline] __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072 do_io_accounting fs/proc/base.c:2737 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2780 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4be/0x1160 fs/seq_file.c:229 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.0/20853: #0: 0000000028d5c98c (&p->lock){+.+.}, at: seq_read+0x6b/0x1160 fs/seq_file.c:161 stack backtrace: CPU: 0 PID: 20853 Comm: syz-executor.0 Not tainted 4.19.184-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:1221 check_prev_add kernel/locking/lockdep.c:1865 [inline] check_prevs_add kernel/locking/lockdep.c:1978 [inline] validate_chain kernel/locking/lockdep.c:2419 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3415 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072 do_io_accounting fs/proc/base.c:2737 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2780 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4be/0x1160 fs/seq_file.c:229 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: 0033:0x466459 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2269d73188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 000000000000037d RSI: 0000000020000500 RDI: 0000000000000004 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffdbdbd008f R14: 00007f2269d73300 R15: 0000000000022000 Bluetooth: hci3: command 0x040f tx timeout MTD: Attempt to mount non-MTD device "/dev/loop2" REISERFS warning (device loop5): super-6502 reiserfs_getopt: unknown mount option "u" romfs: Mounting image 'rom 5f663c08' through the block layer REISERFS warning (device loop5): super-6502 reiserfs_getopt: unknown mount option "u" netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. XFS (loop1): Invalid superblock magic number print_req_error: I/O error, dev loop4, sector 0 XFS (loop4): SB validate failed with error -5. netlink: 'syz-executor.0': attribute type 29 has an invalid length. netlink: 'syz-executor.0': attribute type 29 has an invalid length. IPVS: ftp: loaded support on port[0] = 21 netlink: 'syz-executor.0': attribute type 29 has an invalid length. IPVS: ftp: loaded support on port[0] = 21 XFS (loop1): Invalid superblock magic number netlink: 1037 bytes leftover after parsing attributes in process `syz-executor.4'. XFS (loop1): Invalid superblock magic number netlink: 1037 bytes leftover after parsing attributes in process `syz-executor.4'. encrypted_key: insufficient parameters specified XFS (loop4): Invalid superblock magic number encrypted_key: insufficient parameters specified XFS (loop1): Invalid superblock magic number netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. Attempt to read inode for relocated directory netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. Bluetooth: hci3: command 0x0419 tx timeout XFS (loop1): Invalid superblock magic number print_req_error: I/O error, dev loop4, sector 0 XFS (loop4): SB validate failed with error -5. Bluetooth: hci5: command 0x0406 tx timeout XFS (loop1): Invalid superblock magic number (unnamed net_device) (uninitialized): option packets_per_slave: invalid value (18446744073709551615) (unnamed net_device) (uninitialized): option packets_per_slave: allowed values 0 - 65535 (unnamed net_device) (uninitialized): option packets_per_slave: invalid value (18446744073709551615) (unnamed net_device) (uninitialized): option packets_per_slave: allowed values 0 - 65535 XFS (loop1): Invalid superblock magic number SET target dimension over the limit! SET target dimension over the limit! XFS (loop2): Invalid superblock magic number XFS (loop1): Invalid superblock magic number XFS (loop2): Invalid superblock magic number audit: type=1800 audit(1617702147.326:74): pid=21315 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.3" name="SYSV00000000" dev="hugetlbfs" ino=32769 res=0 XFS (loop1): Invalid superblock magic number XFS (loop2): Invalid superblock magic number XFS (loop4): Invalid superblock magic number XFS (loop1): Invalid superblock magic number XFS (loop1): Invalid superblock magic number netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. XFS (loop2): Invalid superblock magic number bridge8: port 1(syz_tun) entered blocking state bridge8: port 1(syz_tun) entered disabled state device syz_tun entered promiscuous mode netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. XFS (loop4): Invalid superblock magic number IPVS: ftp: loaded support on port[0] = 21 XFS (loop1): Invalid superblock magic number netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. device syz_tun left promiscuous mode XFS (loop2): Invalid superblock magic number bridge8: port 1(syz_tun) entered disabled state bridge9: port 1(syz_tun) entered blocking state bridge9: port 1(syz_tun) entered disabled state device syz_tun entered promiscuous mode XFS (loop4): Invalid superblock magic number XFS (loop1): Invalid superblock magic number XFS (loop5): Invalid superblock magic number XFS (loop2): Invalid superblock magic number XFS (loop4): Invalid superblock magic number XFS (loop3): Invalid superblock magic number XFS (loop1): Invalid superblock magic number XFS (loop5): sunit and swidth options incompatible with the noalign option print_req_error: I/O error, dev loop1, sector 0 XFS (loop1): SB validate failed with error -5. XFS (loop2): Invalid superblock magic number XFS (loop4): Invalid superblock magic number XFS (loop5): sunit and swidth options incompatible with the noalign option XFS (loop1): Invalid superblock magic number print_req_error: I/O error, dev loop2, sector 0 XFS (loop2): SB validate failed with error -5. print_req_error: I/O error, dev loop2, sector 0 XFS (loop4): Invalid superblock magic number XFS (loop1): Invalid superblock magic number XFS (loop2): Invalid superblock magic number print_req_error: I/O error, dev loop1, sector 0 XFS (loop1): SB validate failed with error -5. XFS (loop4): Invalid superblock magic number XFS (loop2): Invalid superblock magic number XFS (loop4): Invalid superblock magic number XFS (loop1): Invalid superblock magic number XFS (loop5): Invalid superblock magic number XFS (loop4): Invalid superblock magic number print_req_error: I/O error, dev loop5, sector 0 print_req_error: I/O error, dev loop3, sector 0 XFS (loop1): Invalid superblock magic number XFS (loop5): SB validate failed with error -5. XFS (loop3): SB validate failed with error -5. XFS (loop4): Invalid superblock magic number print_req_error: I/O error, dev loop2, sector 0 XFS (loop2): SB validate failed with error -5. XFS (loop3): Invalid superblock magic number XFS (loop1): Invalid superblock magic number XFS (loop4): Invalid superblock magic number XFS (loop5): Invalid superblock magic number XFS (loop2): Invalid superblock magic number print_req_error: I/O error, dev loop5, sector 0 XFS (loop5): SB validate failed with error -5. XFS (loop1): Invalid superblock magic number print_req_error: I/O error, dev loop5, sector 0 XFS (loop3): Invalid superblock magic number XFS (loop4): Invalid superblock magic number print_req_error: I/O error, dev loop2, sector 0 XFS (loop2): SB validate failed with error -5. XFS (loop5): Invalid superblock magic number XFS (loop1): SB validate failed with error -5. XFS (loop3): Invalid superblock magic number XFS (loop2): SB validate failed with error -5. XFS (loop5): Invalid superblock magic number XFS (loop3): SB validate failed with error -5. XFS (loop1): SB validate failed with error -5.