audit: type=1400 audit(1575313223.294:30): avc: denied { map } for pid=11639 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 ====================================================== WARNING: possible circular locking dependency detected 4.14.157-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/11644 is trying to acquire lock: (pmus_lock){+.+.}, at: [<000000009448cbe3>] swevent_hlist_get kernel/events/core.c:7917 [inline] (pmus_lock){+.+.}, at: [<000000009448cbe3>] perf_swevent_init+0x123/0x4f0 kernel/events/core.c:7977 but task is already holding lock: audit: type=1400 audit(1575313223.294:31): avc: denied { create } for pid=11626 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 (&cpuctx_mutex/1){+.+.}, at: [<0000000009b26b8f>] perf_event_ctx_lock_nested+0x15a/0x2d0 kernel/events/core.c:1241 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&cpuctx_mutex/1){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xf7/0x13e0 kernel/locking/mutex.c:893 mutex_lock_double kernel/events/core.c:9939 [inline] __perf_event_ctx_lock_double kernel/events/core.c:9998 [inline] SYSC_perf_event_open kernel/events/core.c:10263 [inline] SyS_perf_event_open+0x12cf/0x2560 kernel/events/core.c:10018 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (&cpuctx_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xf7/0x13e0 kernel/locking/mutex.c:893 perf_event_init_cpu+0xa8/0x150 kernel/events/core.c:11261 perf_event_init+0x289/0x2c5 kernel/events/core.c:11308 start_kernel+0x583/0x890 init/main.c:645 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #0 (pmus_lock){+.+.}: lock_acquire+0x12b/0x360 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xf7/0x13e0 kernel/locking/mutex.c:893 swevent_hlist_get kernel/events/core.c:7917 [inline] perf_swevent_init+0x123/0x4f0 kernel/events/core.c:7977 perf_try_init_event+0xe5/0x200 kernel/events/core.c:9363 perf_init_event kernel/events/core.c:9401 [inline] perf_event_alloc.part.0+0xd1e/0x21d0 kernel/events/core.c:9661 audit: type=1400 audit(1575313223.294:32): avc: denied { write } for pid=11626 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 perf_event_alloc kernel/events/core.c:10028 [inline] SYSC_perf_event_open kernel/events/core.c:10135 [inline] SyS_perf_event_open+0x6eb/0x2560 kernel/events/core.c:10018 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Chain exists of: pmus_lock --> &cpuctx_mutex --> &cpuctx_mutex/1 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cpuctx_mutex/1); lock(&cpuctx_mutex); lock(&cpuctx_mutex/1); lock(pmus_lock); *** DEADLOCK *** 2 locks held by syz-executor.3/11644: #0: (&pmus_srcu){....}, at: [<000000005acb1a02>] perf_event_alloc.part.0+0xb39/0x21d0 kernel/events/core.c:9655 #1: (&cpuctx_mutex/1){+.+.}, at: [<0000000009b26b8f>] perf_event_ctx_lock_nested+0x15a/0x2d0 kernel/events/core.c:1241 stack backtrace: CPU: 1 PID: 11644 Comm: syz-executor.3 Not tainted 4.14.157-syzkaller #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xe5/0x154 lib/dump_stack.c:58 print_circular_bug.isra.0.cold+0x2dc/0x425 kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1901 [inline] check_prevs_add kernel/locking/lockdep.c:2018 [inline] validate_chain kernel/locking/lockdep.c:2460 [inline] __lock_acquire+0x2f5f/0x4320 kernel/locking/lockdep.c:3487 lock_acquire+0x12b/0x360 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xf7/0x13e0 kernel/locking/mutex.c:893 audit: type=1400 audit(1575313223.294:33): avc: denied { read } for pid=11626 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 swevent_hlist_get kernel/events/core.c:7917 [inline] perf_swevent_init+0x123/0x4f0 kernel/events/core.c:7977 perf_try_init_event+0xe5/0x200 kernel/events/core.c:9363 perf_init_event kernel/events/core.c:9401 [inline] perf_event_alloc.part.0+0xd1e/0x21d0 kernel/events/core.c:9661 perf_event_alloc kernel/events/core.c:10028 [inline] SYSC_perf_event_open kernel/events/core.c:10135 [inline] SyS_perf_event_open+0x6eb/0x2560 kernel/events/core.c:10018 IPv6: sit63: Disabled Multicast RS do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a679 RSP: 002b:00007f1bb4cc6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a679 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000200 RBP: 000000000075bf20 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f1bb4cc76d4 R13: 00000000004c834f R14: 00000000004df530 R15: 00000000ffffffff audit: type=1400 audit(1575313223.644:34): avc: denied { map } for pid=11653 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 IPv6: sit64: Disabled Multicast RS IPv6: sit65: Disabled Multicast RS audit: type=1400 audit(1575313223.924:35): avc: denied { create } for pid=11658 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(1575313223.924:36): avc: denied { write } for pid=11658 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 IPv6: sit66: Disabled Multicast RS audit: type=1400 audit(1575313223.944:37): avc: denied { read } for pid=11658 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 IPv6: sit67: Disabled Multicast RS IPv6: sit68: Disabled Multicast RS IPv6: sit69: Disabled Multicast RS IPv6: sit70: Disabled Multicast RS IPv6: sit71: Disabled Multicast RS IPv6: sit72: Disabled Multicast RS IPv6: sit73: Disabled Multicast RS IPv6: sit74: Disabled Multicast RS audit: type=1400 audit(1575313225.814:38): avc: denied { map } for pid=11724 comm="syz-executor.5" path="/root/syz-executor.5" dev="sda1" ino=2339 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(1575313225.814:39): avc: denied { map } for pid=11724 comm="syz-executor.5" path="/sys/kernel/debug/kcov" dev="debugfs" ino=5044 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:debugfs_t:s0 tclass=file permissive=1 IPv6: sit75: Disabled Multicast RS IPv6: sit76: Disabled Multicast RS IPv6: sit77: Disabled Multicast RS IPv6: sit78: Disabled Multicast RS IPv6: sit79: Disabled Multicast RS IPv6: sit80: Disabled Multicast RS IPv6: sit81: Disabled Multicast RS IPv6: sit82: Disabled Multicast RS IPv6: sit83: Disabled Multicast RS IPv6: sit84: Disabled Multicast RS IPv6: sit85: Disabled Multicast RS IPv6: sit86: Disabled Multicast RS IPv6: sit87: Disabled Multicast RS IPv6: sit88: Disabled Multicast RS IPv6: sit89: Disabled Multicast RS IPv6: sit90: Disabled Multicast RS IPv6: sit91: Disabled Multicast RS IPv6: sit92: Disabled Multicast RS IPv6: sit93: Disabled Multicast RS IPv6: sit94: Disabled Multicast RS IPv6: sit95: Disabled Multicast RS IPv6: sit96: Disabled Multicast RS IPv6: sit97: Disabled Multicast RS IPv6: sit98: Disabled Multicast RS IPv6: sit99: Disabled Multicast RS IPv6: sit100: Disabled Multicast RS IPv6: sit101: Disabled Multicast RS IPv6: sit102: Disabled Multicast RS IPv6: sit103: Disabled Multicast RS IPv6: sit104: Disabled Multicast RS IPv6: sit105: Disabled Multicast RS IPv6: sit106: Disabled Multicast RS