syz.0.3156[19975] is installing a program with bpf_probe_write_user helper that may corrupt user memory! syz.0.3156[19975] is installing a program with bpf_probe_write_user helper that may corrupt user memory! FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 ====================================================== WARNING: possible circular locking dependency detected 5.15.165-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.3156/19975 is trying to acquire lock: ffffffff8c7fc438 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138 but task is already holding lock: ffff8880b903a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xa8/0x140 kernel/sched/core.c:483 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 _raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:368 raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] rq_lock kernel/sched/sched.h:1621 [inline] task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11484 sched_cgroup_fork+0x2d3/0x330 kernel/sched/core.c:4463 copy_process+0x224a/0x3ef0 kernel/fork.c:2320 kernel_clone+0x210/0x960 kernel/fork.c:2604 kernel_thread+0x168/0x1e0 kernel/fork.c:2656 rest_init+0x21/0x330 init/main.c:706 start_kernel+0x48c/0x540 init/main.c:1140 secondary_startup_64_no_verify+0xb1/0xbb -> #1 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4027 up+0x6e/0x90 kernel/locking/semaphore.c:190 __up_console_sem+0x11a/0x1e0 kernel/printk/printk.c:256 console_unlock+0x1145/0x12b0 kernel/printk/printk.c:2760 vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274 _printk+0xd1/0x120 kernel/printk/printk.c:2299 addrconf_notify+0xa80/0xf30 net/ipv6/addrconf.c:3659 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2018 [inline] netdev_state_change+0x1a3/0x250 net/core/dev.c:1409 linkwatch_do_dev+0x10c/0x160 net/core/link_watch.c:167 __linkwatch_run_queue+0x4ca/0x7f0 net/core/link_watch.c:213 linkwatch_event+0x48/0x50 net/core/link_watch.c:252 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #0 ((console_sem).lock){-.-.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:239 console_trylock kernel/printk/printk.c:2575 [inline] console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867 vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273 _printk+0xd1/0x120 kernel/printk/printk.c:2299 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x36c/0x4c0 lib/fault-inject.c:146 __copy_to_user_inatomic include/linux/uaccess.h:133 [inline] copy_to_user_nofault+0xdd/0x1c0 mm/maccess.c:255 bpf_prog_6303d92f98284ad8+0x3b/0x820 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline] bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1918 __traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220 trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777 irqentry_exit+0x53/0x80 kernel/entry/common.c:432 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643 arch_atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline] arch_atomic_long_read include/linux/atomic/atomic-long.h:29 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:1184 [inline] fsnotify_parent include/linux/fsnotify.h:62 [inline] fsnotify_file include/linux/fsnotify.h:105 [inline] fsnotify_modify include/linux/fsnotify.h:323 [inline] vfs_write+0x5f5/0xe50 fs/read_write.c:598 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock((console_sem).lock); *** DEADLOCK *** 4 locks held by syz.0.3156/19975: #0: ffff888018ba8ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2cb/0x380 fs/file.c:1088 #1: ffff88801fc3a460 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x29a/0xe50 fs/read_write.c:590 #2: ffff8880b903a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xa8/0x140 kernel/sched/core.c:483 #3: ffffffff8c91fbe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311 stack backtrace: CPU: 1 PID: 19975 Comm: syz.0.3156 Not tainted 5.15.165-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:239 console_trylock kernel/printk/printk.c:2575 [inline] console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867 vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273 _printk+0xd1/0x120 kernel/printk/printk.c:2299 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x36c/0x4c0 lib/fault-inject.c:146 __copy_to_user_inatomic include/linux/uaccess.h:133 [inline] copy_to_user_nofault+0xdd/0x1c0 mm/maccess.c:255 bpf_prog_6303d92f98284ad8+0x3b/0x820 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline] bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1918 __traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220 trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777 irqentry_exit+0x53/0x80 kernel/entry/common.c:432 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643 RIP: 0010:fsnotify_parent include/linux/fsnotify.h:62 [inline] RIP: 0010:fsnotify_file include/linux/fsnotify.h:105 [inline] RIP: 0010:fsnotify_modify include/linux/fsnotify.h:323 [inline] RIP: 0010:vfs_write+0x5f5/0xe50 fs/read_write.c:598 Code: 00 00 e8 5e 11 f5 ff 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 af 0f f5 ff 49 8b 1c 24 <31> ff 48 89 de e8 b1 4a ab ff 48 85 db 0f 84 45 01 00 00 4c 89 e8 RSP: 0018:ffffc90003277ca0 EFLAGS: 00000246 RAX: 1ffff11003f874fa RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88801fc3a7d0 RBP: ffffc90003277e30 R08: dffffc0000000000 R09: ffffed1003f874fb R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801fc3a7d0 R13: ffff888060d2d070 R14: 1ffff9200064efa0 R15: 0000000000000001 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f8d92d3599f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48 RSP: 002b:00007f8d91171030 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000000000a RCX: 00007f8d92d3599f RDX: 0000000000000001 RSI: 00007f8d91171090 RDI: 000000000000000a RBP: 00007f8d91171090 R08: 0000000000000000 R09: 00007f8d91170df7 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f8d92ed3130 R15: 00007ffc635722f8 CPU: 1 PID: 19975 Comm: syz.0.3156 Not tainted 5.15.165-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 fail_dump lib/fault-inject.c:52 [inline] should_fail+0x38a/0x4c0 lib/fault-inject.c:146 __copy_to_user_inatomic include/linux/uaccess.h:133 [inline] copy_to_user_nofault+0xdd/0x1c0 mm/maccess.c:255 bpf_prog_6303d92f98284ad8+0x3b/0x820 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline] bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1918 __traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220 trace_sched_switch include/trace/events/sched.h:220 [inline] __schedule+0x1e8d/0x45b0 kernel/sched/core.c:6370 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777 irqentry_exit+0x53/0x80 kernel/entry/common.c:432 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643 RIP: 0010:fsnotify_parent include/linux/fsnotify.h:62 [inline] RIP: 0010:fsnotify_file include/linux/fsnotify.h:105 [inline] RIP: 0010:fsnotify_modify include/linux/fsnotify.h:323 [inline] RIP: 0010:vfs_write+0x5f5/0xe50 fs/read_write.c:598 Code: 00 00 e8 5e 11 f5 ff 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 af 0f f5 ff 49 8b 1c 24 <31> ff 48 89 de e8 b1 4a ab ff 48 85 db 0f 84 45 01 00 00 4c 89 e8 RSP: 0018:ffffc90003277ca0 EFLAGS: 00000246 RAX: 1ffff11003f874fa RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88801fc3a7d0 RBP: ffffc90003277e30 R08: dffffc0000000000 R09: ffffed1003f874fb R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801fc3a7d0 R13: ffff888060d2d070 R14: 1ffff9200064efa0 R15: 0000000000000001 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f8d92d3599f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48 RSP: 002b:00007f8d91171030 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000000000a RCX: 00007f8d92d3599f RDX: 0000000000000001 RSI: 00007f8d91171090 RDI: 000000000000000a RBP: 00007f8d91171090 R08: 0000000000000000 R09: 00007f8d91170df7 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f8d92ed3130 R15: 00007ffc635722f8 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: e8 5e 11 f5 ff call 0xfff51165 7: 4c 89 e0 mov %r12,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 15: fc ff df 18: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 1c: 74 08 je 0x26 1e: 4c 89 e7 mov %r12,%rdi 21: e8 af 0f f5 ff call 0xfff50fd5 26: 49 8b 1c 24 mov (%r12),%rbx * 2a: 31 ff xor %edi,%edi <-- trapping instruction 2c: 48 89 de mov %rbx,%rsi 2f: e8 b1 4a ab ff call 0xffab4ae5 34: 48 85 db test %rbx,%rbx 37: 0f 84 45 01 00 00 je 0x182 3d: 4c 89 e8 mov %r13,%rax