------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.9.0-rc1-syzkaller-00355-g712e14250dd2 #0 Not tainted ------------------------------------------------------ syz-executor.0/5462 is trying to acquire lock: ffffffff8db9f218 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 but task is already holding lock: ffff88806b32a858 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5d/0x220 kernel/time/timer.c:1052 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&base->lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 lock_timer_base+0x5d/0x220 kernel/time/timer.c:1052 __mod_timer+0x426/0xdc0 kernel/time/timer.c:1133 add_timer_global+0x8a/0xc0 kernel/time/timer.c:1331 __queue_delayed_work+0x1ba/0x2e0 kernel/workqueue.c:2567 queue_delayed_work_on+0x10e/0x130 kernel/workqueue.c:2595 psi_task_change+0x1b4/0x2e0 kernel/sched/psi.c:912 psi_enqueue kernel/sched/stats.h:139 [inline] enqueue_task kernel/sched/core.c:2112 [inline] activate_task+0x213/0x400 kernel/sched/core.c:2146 wake_up_new_task+0x574/0xc90 kernel/sched/core.c:4901 kernel_clone+0x236/0x980 kernel/fork.c:2827 user_mode_thread+0xb4/0xf0 kernel/fork.c:2874 rest_init+0x23/0x2b0 init/main.c:697 start_kernel+0x3a3/0x490 init/main.c:1074 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148 -> #2 (&rq->__lock){-.-.}-{2:2}: _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559 raw_spin_rq_lock kernel/sched/sched.h:1385 [inline] rq_lock kernel/sched/sched.h:1699 [inline] task_fork_fair+0x70/0x240 kernel/sched/fair.c:12635 sched_cgroup_fork+0x3cf/0x510 kernel/sched/core.c:4845 copy_process+0x4106/0x9160 kernel/fork.c:2498 kernel_clone+0xfd/0x980 kernel/fork.c:2796 user_mode_thread+0xb4/0xf0 kernel/fork.c:2874 rest_init+0x23/0x2b0 init/main.c:697 start_kernel+0x3a3/0x490 init/main.c:1074 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148 -> #1 (&p->pi_lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline] try_to_wake_up+0x9a/0x13e0 kernel/sched/core.c:4262 up+0x79/0xb0 kernel/locking/semaphore.c:191 __up_console_sem kernel/printk/printk.c:340 [inline] __console_unlock kernel/printk/printk.c:2731 [inline] console_unlock+0x23e/0x290 kernel/printk/printk.c:3050 vprintk_emit kernel/printk/printk.c:2348 [inline] vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2373 kauditd_printk_skb kernel/audit.c:546 [inline] kauditd_hold_skb+0x1fb/0x240 kernel/audit.c:581 kauditd_send_queue+0x236/0x290 kernel/audit.c:766 kauditd_thread+0x61e/0xa80 kernel/audit.c:890 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 -> #0 ((console_sem).lock){-...}-{2:2}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323 console_trylock kernel/printk/printk.c:2684 [inline] console_trylock_spinning kernel/printk/printk.c:1958 [inline] vprintk_emit kernel/printk/printk.c:2347 [inline] vprintk_emit+0xe4/0x5a0 kernel/printk/printk.c:2303 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2373 __report_bug lib/bug.c:195 [inline] report_bug+0x4ac/0x580 lib/bug.c:219 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362 spin_unlock_bh include/linux/spinlock.h:396 [inline] sock_hash_delete_elem+0x1f4/0x260 net/core/sock_map.c:947 ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x151/0x420 kernel/trace/bpf_trace.c:2420 __bpf_trace_timer_start+0xc7/0x100 include/trace/events/timer.h:52 trace_timer_start include/trace/events/timer.h:52 [inline] enqueue_timer+0x2b4/0x550 kernel/time/timer.c:664 internal_add_timer kernel/time/timer.c:689 [inline] __mod_timer+0x8d7/0xdc0 kernel/time/timer.c:1184 tun_flow_init drivers/net/tun.c:1356 [inline] tun_net_init+0x19c/0x510 drivers/net/tun.c:987 register_netdevice+0x59f/0x1ca0 net/core/dev.c:10204 tun_set_iff drivers/net/tun.c:2849 [inline] __tun_chr_ioctl+0x25b8/0x4770 drivers/net/tun.c:3118 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:890 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x72/0x7a other info that might help us debug this: Chain exists of: (console_sem).lock --> &rq->__lock --> &base->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&base->lock); lock(&rq->__lock); lock(&base->lock); lock((console_sem).lock); *** DEADLOCK *** 3 locks held by syz-executor.0/5462: #0: ffffffff8f71bd88 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x4fc/0x4770 drivers/net/tun.c:3108 #1: ffff88806b32a858 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5d/0x220 kernel/time/timer.c:1052 #2: ffffffff8dbb14a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #2: ffffffff8dbb14a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #2: ffffffff8dbb14a0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline] #2: ffffffff8dbb14a0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xe4/0x420 kernel/trace/bpf_trace.c:2420 stack backtrace: CPU: 3 PID: 5462 Comm: syz-executor.0 Not tainted 6.9.0-rc1-syzkaller-00355-g712e14250dd2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323 console_trylock kernel/printk/printk.c:2684 [inline] console_trylock_spinning kernel/printk/printk.c:1958 [inline] vprintk_emit kernel/printk/printk.c:2347 [inline] vprintk_emit+0xe4/0x5a0 kernel/printk/printk.c:2303 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2373 __report_bug lib/bug.c:195 [inline] report_bug+0x4ac/0x580 lib/bug.c:219 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 RIP: 0010:__local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362 Code: 00 e8 61 6f 0b 00 e8 0c b7 42 00 fb 65 8b 05 fc 02 b2 7e 85 c0 74 52 5b 5d c3 cc cc cc cc 65 8b 05 be b3 b0 7e 85 c0 75 9e 90 <0f> 0b 90 eb 98 e8 13 b5 42 00 eb 99 48 89 ef e8 a9 f4 19 00 eb a2 RSP: 0018:ffffc90003b777e8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000000000201 RCX: 1ffffffff1fc2a0b RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88d496d4 RBP: ffffffff88d496d4 R08: 0000000000000000 R09: ffffed1005935401 R10: ffff88802c9aa00b R11: ffffffff938f3b20 R12: fffffffffffffffe R13: ffff88802c9aa008 R14: ffff88802c9aa000 R15: 00000000049396b8 spin_unlock_bh include/linux/spinlock.h:396 [inline] sock_hash_delete_elem+0x1f4/0x260 net/core/sock_map.c:947 ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x151/0x420 kernel/trace/bpf_trace.c:2420 __bpf_trace_timer_start+0xc7/0x100 include/trace/events/timer.h:52 trace_timer_start include/trace/events/timer.h:52 [inline] enqueue_timer+0x2b4/0x550 kernel/time/timer.c:664 internal_add_timer kernel/time/timer.c:689 [inline] __mod_timer+0x8d7/0xdc0 kernel/time/timer.c:1184 tun_flow_init drivers/net/tun.c:1356 [inline] tun_net_init+0x19c/0x510 drivers/net/tun.c:987 register_netdevice+0x59f/0x1ca0 net/core/dev.c:10204 tun_set_iff drivers/net/tun.c:2849 [inline] __tun_chr_ioctl+0x25b8/0x4770 drivers/net/tun.c:3118 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:890 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7f5fe807dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5fe8d1f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5fe81abf80 RCX: 00007f5fe807dda9 RDX: 00000000200016c0 RSI: 00000000400454ca RDI: 0000000000000005 RBP: 00007f5fe80ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f5fe81abf80 R15: 00007ffebb9d5818 WARNING: CPU: 3 PID: 5462 at kernel/softirq.c:362 __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362 Modules linked in: CPU: 3 PID: 5462 Comm: syz-executor.0 Not tainted 6.9.0-rc1-syzkaller-00355-g712e14250dd2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:__local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362 Code: 00 e8 61 6f 0b 00 e8 0c b7 42 00 fb 65 8b 05 fc 02 b2 7e 85 c0 74 52 5b 5d c3 cc cc cc cc 65 8b 05 be b3 b0 7e 85 c0 75 9e 90 <0f> 0b 90 eb 98 e8 13 b5 42 00 eb 99 48 89 ef e8 a9 f4 19 00 eb a2 RSP: 0018:ffffc90003b777e8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000000000201 RCX: 1ffffffff1fc2a0b RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88d496d4 RBP: ffffffff88d496d4 R08: 0000000000000000 R09: ffffed1005935401 R10: ffff88802c9aa00b R11: ffffffff938f3b20 R12: fffffffffffffffe