overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory ====================================================== WARNING: possible circular locking dependency detected 4.19.190-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor266/18457 is trying to acquire lock: overlayfs: './bus' not a directory 00000000a8edb4f9 (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] 00000000a8edb4f9 (sb_writers#3){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 but task is already holding lock: 0000000042410e3d (&ovl_i_mutex_key[depth]){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 0000000042410e3d (&ovl_i_mutex_key[depth]){+.+.}, at: do_truncate+0x125/0x1f0 fs/open.c:61 overlayfs: './bus' not a directory which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&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 overlayfs: './bus' not a directory 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 overlayfs: './bus' not a directory 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 -> #2 (&sig->cred_guard_mutex){+.+.}: do_io_accounting fs/proc/base.c:2737 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2786 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 overlayfs: './bus' not a directory -> #1 (&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 overlayfs: './bus' not a directory 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 overlayfs: './bus' not a directory entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (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+0x6e/0x2a0 fs/super.c:1366 overlayfs: './bus' not a directory sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_setattr+0xdd/0x920 fs/overlayfs/inode.c:30 notify_change+0x70b/0xfc0 fs/attr.c:334 do_truncate+0x134/0x1f0 fs/open.c:63 handle_truncate fs/namei.c:3009 [inline] do_last fs/namei.c:3427 [inline] path_openat+0x2308/0x2df0 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 other info that might help us debug this: Chain exists of: sb_writers#3 --> &sig->cred_guard_mutex --> &ovl_i_mutex_key[depth] Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ovl_i_mutex_key[depth]); lock(&sig->cred_guard_mutex); lock(&ovl_i_mutex_key[depth]); lock(sb_writers#3); *** DEADLOCK *** 2 locks held by syz-executor266/18457: #0: 000000003d8fd57b (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000003d8fd57b (sb_writers#14){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 0000000042410e3d (&ovl_i_mutex_key[depth]){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000042410e3d (&ovl_i_mutex_key[depth]){+.+.}, at: do_truncate+0x125/0x1f0 fs/open.c:61 stack backtrace: CPU: 0 PID: 18457 Comm: syz-executor266 Not tainted 4.19.190-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 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+0x6e/0x2a0 fs/super.c:1366 sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_setattr+0xdd/0x920 fs/overlayfs/inode.c:30 notify_change+0x70b/0xfc0 fs/attr.c:334 do_truncate+0x134/0x1f0 fs/open.c:63 handle_truncate fs/namei.c:3009 [inline] do_last fs/namei.c:3427 [inline] path_openat+0x2308/0x2df0 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 RIP: 0033:0x453769 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 19 00 00 90 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:00007f734499c178 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00000000004d82b8 RCX: 0000000000453769 RDX: 0000000000453769 RSI: 0000000000000105 RDI: 0000000020000180 RBP: 00000000004d82b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004d82bc R13: 00007fffa91c086f R14: 00007f734499c300 R15: 0000000000022000 overlayfs: filesystem on './bus' not supported as upperdir overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: 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directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: 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directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: 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directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: 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directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: './bus' not a directory overlayfs: 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