====================================================== WARNING: possible circular locking dependency detected autofs4:pid:5005:autofs_fill_super: called with bogus options 4.19.86-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/5014 is trying to acquire lock: 000000007febf479 (&ovl_i_mutex_dir_key[depth]){++++}, at: inode_lock_shared include/linux/fs.h:757 [inline] 000000007febf479 (&ovl_i_mutex_dir_key[depth]){++++}, at: lookup_slow+0x4a/0x80 fs/namei.c:1687 but task is already holding lock: 00000000161a4070 (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x80e/0x2a70 kernel/events/core.c:10557 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:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102 lock_trace+0x4a/0xe0 fs/proc/base.c:402 proc_pid_personality+0x1c/0xd0 fs/proc/base.c:2926 proc_single_show+0xf0/0x180 fs/proc/base.c:755 seq_read+0x4ca/0x1110 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+0x490/0x640 fs/read_write.c:925 vfs_readv+0xf0/0x160 fs/read_write.c:987 do_preadv+0x1c4/0x280 fs/read_write.c:1071 __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x9a/0xf0 fs/read_write.c:1116 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 seq_read+0x71/0x1110 fs/seq_file.c:161 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x490/0x640 fs/read_write.c:925 vfs_readv+0xf0/0x160 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x478/0x890 fs/splice.c:417 do_splice_to+0x127/0x180 fs/splice.c:881 splice_direct_to_actor+0x256/0x890 fs/splice.c:953 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062 do_sendfile+0x597/0xce0 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64 fs/read_write.c:1494 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1494 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (sb_writers#4){.+.+}: 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+0x208/0x360 fs/super.c:1387 sb_start_write include/linux/fs.h:1578 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:24 ovl_create_object+0xb3/0x2c0 fs/overlayfs/dir.c:600 ovl_create+0x28/0x30 fs/overlayfs/dir.c:631 lookup_open+0x12be/0x1ad0 fs/namei.c:3234 do_last fs/namei.c:3324 [inline] path_openat+0x149a/0x45e0 fs/namei.c:3534 do_filp_open+0x1a1/0x280 fs/namei.c:3564 do_sys_open+0x3fe/0x550 fs/open.c:1088 ksys_open include/linux/syscalls.h:1276 [inline] __do_sys_creat fs/open.c:1146 [inline] __se_sys_creat fs/open.c:1144 [inline] __x64_sys_creat+0x61/0x80 fs/open.c:1144 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&ovl_i_mutex_dir_key[depth]){++++}: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 down_read+0x3b/0xb0 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:757 [inline] lookup_slow+0x4a/0x80 fs/namei.c:1687 walk_component+0x747/0x2000 fs/namei.c:1810 lookup_last fs/namei.c:2273 [inline] path_lookupat.isra.0+0x1f5/0x8d0 fs/namei.c:2318 filename_lookup+0x1b0/0x410 fs/namei.c:2348 kern_path+0x36/0x40 fs/namei.c:2434 create_local_trace_uprobe+0x82/0x490 kernel/trace/trace_uprobe.c:1356 perf_uprobe_init+0x12b/0x210 kernel/trace/trace_event_perf.c:317 perf_uprobe_event_init+0xff/0x190 kernel/events/core.c:8540 perf_try_init_event+0x131/0x2f0 kernel/events/core.c:9815 perf_init_event kernel/events/core.c:9846 [inline] perf_event_alloc.part.0+0x1e38/0x2f50 kernel/events/core.c:10120 perf_event_alloc kernel/events/core.c:10476 [inline] __do_sys_perf_event_open+0x99f/0x2a70 kernel/events/core.c:10577 __se_sys_perf_event_open kernel/events/core.c:10466 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10466 do_syscall_64+0xfd/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: &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 *** 2 locks held by syz-executor.1/5014: #0: 00000000161a4070 (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x80e/0x2a70 kernel/events/core.c:10557 #1: 000000000927aacc (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xdf5/0x2f50 kernel/events/core.c:10116 stack backtrace: CPU: 1 PID: 5014 Comm: syz-executor.1 Not tainted 4.19.86-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+0x197/0x210 lib/dump_stack.c:118 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x2e19/0x49c0 kernel/locking/lockdep.c:3411 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 down_read+0x3b/0xb0 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:757 [inline] lookup_slow+0x4a/0x80 fs/namei.c:1687 walk_component+0x747/0x2000 fs/namei.c:1810 lookup_last fs/namei.c:2273 [inline] path_lookupat.isra.0+0x1f5/0x8d0 fs/namei.c:2318 filename_lookup+0x1b0/0x410 fs/namei.c:2348 kern_path+0x36/0x40 fs/namei.c:2434 create_local_trace_uprobe+0x82/0x490 kernel/trace/trace_uprobe.c:1356 perf_uprobe_init+0x12b/0x210 kernel/trace/trace_event_perf.c:317 perf_uprobe_event_init+0xff/0x190 kernel/events/core.c:8540 perf_try_init_event+0x131/0x2f0 kernel/events/core.c:9815 perf_init_event kernel/events/core.c:9846 [inline] perf_event_alloc.part.0+0x1e38/0x2f50 kernel/events/core.c:10120 perf_event_alloc kernel/events/core.c:10476 [inline] __do_sys_perf_event_open+0x99f/0x2a70 kernel/events/core.c:10577 __se_sys_perf_event_open kernel/events/core.c:10466 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10466 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f16ff2a9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f16ff2aa6d4 R13: 00000000004c7b91 R14: 00000000004ddb70 R15: 00000000ffffffff kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kauditd_printk_skb: 188 callbacks suppressed audit: type=1400 audit(1574596132.302:4482): avc: denied { map } for pid=5067 comm="blkid" path="/lib/x86_64-linux-gnu/libuuid.so.1.3.0" dev="sda1" ino=2819 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' audit: type=1400 audit(1574596132.302:4483): avc: denied { map } for pid=5067 comm="blkid" path="/lib/x86_64-linux-gnu/libuuid.so.1.3.0" dev="sda1" ino=2819 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596132.352:4484): avc: denied { map } for pid=5073 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596132.352:4485): avc: denied { map } for pid=5073 comm="modprobe" path="/bin/kmod" dev="sda1" ino=1440 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596132.352:4486): avc: denied { map } for pid=5073 comm="modprobe" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596132.352:4487): avc: denied { map } for pid=5073 comm="modprobe" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596132.392:4488): avc: denied { map } for pid=5073 comm="modprobe" path="/etc/ld.so.cache" dev="sda1" ino=2251 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596132.402:4489): avc: denied { map } for pid=5073 comm="modprobe" path="/lib/x86_64-linux-gnu/libkmod.so.2.1.3" dev="sda1" ino=2811 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596132.412:4490): avc: denied { map } for pid=5073 comm="modprobe" path="/lib/x86_64-linux-gnu/libkmod.so.2.1.3" dev="sda1" ino=2811 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 kobject: 'loop0' (0000000019da73f1): kobject_uevent_env audit: type=1400 audit(1574596132.442:4491): avc: denied { map } for pid=5074 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' kauditd_printk_skb: 259 callbacks suppressed audit: type=1400 audit(1574596137.332:4751): avc: denied { map } for pid=5169 comm="syz-executor.1" path="/root/syzkaller-testdir051691388/syzkaller.a4ZL1S/312/bus" dev="sda1" ino=16527 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596137.392:4752): avc: denied { map } for pid=5170 comm="syz-executor.2" path="/root/syzkaller-testdir024695317/syzkaller.E17p2x/299/bus" dev="sda1" ino=16538 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596137.412:4753): avc: denied { map } for pid=5174 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5' audit: type=1400 audit(1574596137.412:4754): avc: denied { map } for pid=5174 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596137.412:4755): avc: denied { map } for pid=5174 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596137.412:4756): avc: denied { map } for pid=5174 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596137.462:4757): avc: denied { map } for pid=5173 comm="syz-executor.3" path="/root/syzkaller-testdir523444848/syzkaller.HbZ1WR/29/bus" dev="sda1" ino=16610 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 kobject: 'loop0' (0000000019da73f1): kobject_uevent_env kobject: 'loop0' (0000000019da73f1): fill_kobj_path: path = '/devices/virtual/block/loop0' audit: type=1400 audit(1574596137.472:4758): avc: denied { map } for pid=5174 comm="blkid" path="/etc/ld.so.cache" dev="sda1" ino=2251 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596137.472:4759): avc: denied { map } for pid=5174 comm="blkid" path="/lib/x86_64-linux-gnu/libblkid.so.1.1.0" dev="sda1" ino=2825 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1574596137.482:4760): avc: denied { map } for pid=5174 comm="blkid" path="/lib/x86_64-linux-gnu/libblkid.so.1.1.0" dev="sda1" ino=2825 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 kobject: 'kvm' (000000002791e044): kobject_uevent_env kobject: 'kvm' (000000002791e044): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000002791e044): kobject_uevent_env kobject: 'kvm' (000000002791e044): fill_kobj_path: path = '/devices/virtual/misc/kvm' binder_alloc: binder_alloc_mmap_handler: 5207 20ffc000-20fff000 already mapped failed -16 kobject: 'kvm' (000000002791e044): kobject_uevent_env kobject: 'loop5' (00000000d2786dfd): kobject_uevent_env binder_alloc: binder_alloc_mmap_handler: 5207 20ffc000-20fff000 already mapped failed -16 kobject: 'kvm' (000000002791e044): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop5' (00000000d2786dfd): fill_kobj_path: path = '/devices/virtual/block/loop5'