====================================================== WARNING: possible circular locking dependency detected 4.19.208-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/26450 is trying to acquire lock: 00000000c897dc42 (cpu_hotplug_lock.rw_sem){++++}, at: __static_key_slow_dec kernel/jump_label.c:222 [inline] 00000000c897dc42 (cpu_hotplug_lock.rw_sem){++++}, at: static_key_slow_dec+0x4f/0x90 kernel/jump_label.c:237 but task is already holding lock: 00000000066072f4 (&mm->mmap_sem){++++}, at: vm_mmap_pgoff+0x152/0x200 mm/util.c:355 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&mm->mmap_sem){++++}: perf_copy_attr+0xab/0x7a0 kernel/events/core.c:10275 _perf_ioctl+0x6aa/0x2300 kernel/events/core.c:5150 perf_ioctl+0x55/0x80 kernel/events/core.c:5177 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&cpuctx_mutex){+.+.}: perf_event_init_cpu+0xc4/0x170 kernel/events/core.c:11828 perf_event_init+0x309/0x34e kernel/events/core.c:11875 start_kernel+0x5b1/0x911 init/main.c:644 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #1 (pmus_lock){+.+.}: perf_event_init_cpu+0x2c/0x170 kernel/events/core.c:11822 cpuhp_invoke_callback+0x201/0x1b80 kernel/cpu.c:170 cpuhp_up_callbacks kernel/cpu.c:584 [inline] _cpu_up+0x25c/0x540 kernel/cpu.c:1192 do_cpu_up+0xdd/0x1b0 kernel/cpu.c:1228 smp_init+0x1ed/0x202 kernel/smp.c:578 kernel_init_freeable+0x62b/0xab7 init/main.c:1138 kernel_init+0xd/0x1ba init/main.c:1062 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 -> #0 (cpu_hotplug_lock.rw_sem){++++}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] cpus_read_lock+0x3b/0xd0 kernel/cpu.c:290 __static_key_slow_dec kernel/jump_label.c:222 [inline] static_key_slow_dec+0x4f/0x90 kernel/jump_label.c:237 sw_perf_event_destroy+0x8a/0x120 kernel/events/core.c:8311 _free_event+0x32c/0x1150 kernel/events/core.c:4484 put_event kernel/events/core.c:4578 [inline] perf_mmap_close+0x6f6/0xea0 kernel/events/core.c:5582 remove_vma+0xa9/0x170 mm/mmap.c:176 remove_vma_list mm/mmap.c:2550 [inline] do_munmap+0x6f9/0xde0 mm/mmap.c:2786 mmap_region+0x2a3/0x16b0 mm/mmap.c:1700 do_mmap+0x8e8/0x1080 mm/mmap.c:1530 do_mmap_pgoff include/linux/mm.h:2329 [inline] vm_mmap_pgoff+0x197/0x200 mm/util.c:357 ksys_mmap_pgoff+0x298/0x5a0 mm/mmap.c:1580 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: cpu_hotplug_lock.rw_sem --> &cpuctx_mutex --> &mm->mmap_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_sem); lock(&cpuctx_mutex); lock(&mm->mmap_sem); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** 1 lock held by syz-executor.2/26450: #0: 00000000066072f4 (&mm->mmap_sem){++++}, at: vm_mmap_pgoff+0x152/0x200 mm/util.c:355 stack backtrace: CPU: 0 PID: 26450 Comm: syz-executor.2 Not tainted 4.19.208-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] cpus_read_lock+0x3b/0xd0 kernel/cpu.c:290 __static_key_slow_dec kernel/jump_label.c:222 [inline] static_key_slow_dec+0x4f/0x90 kernel/jump_label.c:237 sw_perf_event_destroy+0x8a/0x120 kernel/events/core.c:8311 _free_event+0x32c/0x1150 kernel/events/core.c:4484 put_event kernel/events/core.c:4578 [inline] perf_mmap_close+0x6f6/0xea0 kernel/events/core.c:5582 remove_vma+0xa9/0x170 mm/mmap.c:176 remove_vma_list mm/mmap.c:2550 [inline] do_munmap+0x6f9/0xde0 mm/mmap.c:2786 mmap_region+0x2a3/0x16b0 mm/mmap.c:1700 do_mmap+0x8e8/0x1080 mm/mmap.c:1530 do_mmap_pgoff include/linux/mm.h:2329 [inline] vm_mmap_pgoff+0x197/0x200 mm/util.c:357 ksys_mmap_pgoff+0x298/0x5a0 mm/mmap.c:1580 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f28b3fec8d9 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:00007f28b1521188 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f28b40f10e0 RCX: 00007f28b3fec8d9 RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020ffd000 RBP: 00007f28b4046cb4 R08: 0000000000000004 R09: 0000000000000000 R10: 0000200000000011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc36092c4f R14: 00007f28b1521300 R15: 0000000000022000 audit: type=1804 audit(1633383920.256:425): pid=26467 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2447/bus" dev="sda1" ino=15583 res=1 audit: type=1800 audit(1633383920.276:426): pid=26467 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=15583 res=0 kauditd_printk_skb: 46 callbacks suppressed audit: type=1804 audit(1633383922.696:473): pid=26641 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/130/bus" dev="sda1" ino=14980 res=1 audit: type=1804 audit(1633383922.696:474): pid=26641 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/130/bus" dev="sda1" ino=14980 res=1 audit: type=1804 audit(1633383922.696:475): pid=26641 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/130/bus" dev="sda1" ino=14980 res=1 audit: type=1804 audit(1633383922.806:476): pid=26593 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2451/bus" dev="sda1" ino=15713 res=1 audit: type=1804 audit(1633383922.896:477): pid=26656 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/131/bus" dev="sda1" ino=15593 res=1 audit: type=1804 audit(1633383922.896:478): pid=26656 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/131/bus" dev="sda1" ino=15593 res=1 audit: type=1804 audit(1633383922.896:479): pid=26656 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/131/bus" dev="sda1" ino=15593 res=1 audit: type=1804 audit(1633383923.336:480): pid=26682 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/132/bus" dev="sda1" ino=15745 res=1 audit: type=1804 audit(1633383923.366:481): pid=26682 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/132/bus" dev="sda1" ino=15745 res=1 audit: type=1804 audit(1633383923.366:482): pid=26682 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir470260520/syzkaller.IE6zsI/132/bus" dev="sda1" ino=15745 res=1 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. kauditd_printk_skb: 44 callbacks suppressed audit: type=1804 audit(1633383927.986:527): pid=26940 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2466/bus" dev="sda1" ino=14264 res=1 audit: type=1804 audit(1633383927.986:528): pid=26940 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2466/bus" dev="sda1" ino=14264 res=1 audit: type=1804 audit(1633383927.986:529): pid=26940 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2466/bus" dev="sda1" ino=14264 res=1 audit: type=1804 audit(1633383928.136:530): pid=26953 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2467/bus" dev="sda1" ino=14740 res=1 audit: type=1804 audit(1633383928.136:531): pid=26953 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2467/bus" dev="sda1" ino=14740 res=1 audit: type=1804 audit(1633383928.136:532): pid=26953 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2467/bus" dev="sda1" ino=14740 res=1 audit: type=1804 audit(1633383928.306:533): pid=26969 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2468/bus" dev="sda1" ino=14740 res=1 audit: type=1804 audit(1633383928.306:534): pid=26969 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2468/bus" dev="sda1" ino=14740 res=1 audit: type=1804 audit(1633383928.306:535): pid=26969 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2468/bus" dev="sda1" ino=14740 res=1 audit: type=1804 audit(1633383929.037:536): pid=26994 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir589852850/syzkaller.t3NQyh/2469/bus" dev="sda1" ino=14962 res=1